rest APIs

AdoptAPet provides pet adoption listings including breed, age, location, and photos.

Axolotl API returns random photos and fun facts about axolotls (aquatic salamanders).

Cat Facts delivers random, verified facts about cats via a simple REST API.

Cataas provides programmatic access to cat as a service (cats pictures and gifs) via REST API.

The Cat API provides random cat images, breed data, and voting features.

Dog Facts API returns random interesting facts about dogs as plain JSON.

This Dog Facts API returns random dog facts in clean JSON with no API key required.

The Dog CEO API serves random dog images from the Stanford Dogs Dataset, organized by breed.

eBird API from Cornell Lab provides real birding observation data including species sightings, locations, and notable birds by region.

FishWatch by NOAA provides sustainability data, habitat info, and images for US fish species.

HTTP Cat returns a cat-themed image for any HTTP status code via a simple URL pattern.

HTTP Dog serves a photo of a dog for every HTTP status code (200, 404, 500, etc.), making it easy to visualize API responses in a fun way.

The IUCN Red List API provides conservation status data for over 150,000 animal, plant, and fungal species, including whether a species is Extinct, Endangered, or Least Concern.

MeowFacts returns random, verified facts about cats such as their sleep habits, hunting instincts, and biological quirks.

Movebank is a global database of animal movement and migration tracking data collected by GPS tags and sensors attached to wild animals worldwide.

The Petfinder API connects you to a database of adoptable pets — dogs, cats, rabbits, birds, and more — from thousands of shelters and rescue organizations across North America.

PlaceBear generates placeholder bear images at any pixel dimensions you specify, making it easy to fill wireframes and mockups with visually interesting content during development.

PlaceDog generates placeholder dog images at any dimensions you request by encoding width and height in the URL path, letting you drop real dog photos into wireframes without any auth or setup.

PlaceKitten provides programmatic access to placeholder kitten pictures via REST API.

RandomDog returns a JSON object with the URL of a random dog image (JPEG, PNG, or GIF) sourced from user-submitted photos on random.dog.

RandomDuck serves random photos and illustrations of ducks from a community-curated collection, returning a JSON object with the direct image URL.

RandomFox returns a random photo of a fox from a curated collection, providing a JSON object with a direct image URL and an index number identifying the specific fox.

RescueGroups provides programmatic access to adoption via REST API.

Shibe.Online delivers random image URLs of Shiba Inu dogs, cats, or birds with a single GET request.

The Dog API provides hundreds of dog breed images, searchable breed metadata like temperament and life span, and user-uploaded photo voting.

xeno-canto is a community-built library of over 700,000 wild bird sound recordings from around the world.

Zoo Animals provides programmatic access to facts and pictures of zoo animals via REST API.

AniAPI aggregates anime data from multiple sources and lets you search titles, retrieve episode lists, and sync watch progress with popular trackers.

AniDB is one of the oldest and most detailed anime databases, tracking episode titles, staff, characters, and file-level metadata used by media players and subtitle groups.

AniList exposes a GraphQL API covering anime and manga metadata, user lists, reviews, and social features.

AnimeChan serves a database of 10,000+ anime quotes with character and anime title metadata.

AnimeFacts is a simple REST API with over 100 trivia facts about popular anime series, accessible by an anime slug name.

Anime News Network exposes its encyclopedia data as a free XML API, covering anime and manga titles, cast, staff, genres, and release information maintained by professional journalists.

Catboy serves random neko (anime cat-person) images and GIFs across several mood categories with no API key required.

Danbooru is a large anime image board with a structured tagging system covering thousands of anime artists and characters.

Jikan is an unofficial REST API for MyAnimeList that lets you fetch anime and manga data without OAuth setup.

Kitsu is a JSON:API-compliant anime and manga tracking platform that lets you search titles, manage user libraries, and fetch detailed series metadata.

MangaDex provides programmatic access to manga database and community via REST API.

Mangapi is a RapidAPI-hosted service that detects and translates text found in manga panels from one language to another.

MyAnimeList (MAL) is the most popular anime and manga tracking site, and its official API lets you search titles, manage user watchlists, and retrieve community statistics.

NekosBest serves anime-style neko (cat-girl) images and roleplay GIF reactions like hugging, patting, or waving, all sourced from a curated anime art collection.

Shikimori is a Russian-language anime and manga tracking platform whose API exposes anime metadata, user rates, forums, and calendar data.

Studio Ghibli provides programmatic access to resources from studio ghibli films via REST API.

Trace.moe finds the exact anime scene matching a screenshot or image you upload, returning the anime title, episode number, and timestamp of the matching scene.

Waifu.im hosts a curated archive of over 4,000 anime-style character images organized by tags like maid, uniform, wink, or ero.

Waifu.pics is a simple anime image sharing API that returns random anime images from categories like waifu, neko, shinobu, and many more.

AbuseIPDB lets you check whether an IP address has been reported for malicious activity like spam, hacking, or DDoS attacks.

AlienVault Open Threat Exchange (OTX) provides programmatic access to ip/domain/url reputation via REST API.

CAPEsandbox is an open-source malware analysis platform that executes suspicious files in an isolated environment and reports on their behavior.

Google Safe Browsing lets you check any URL against Google's constantly updated lists of phishing sites, malware distributors, and unwanted software.

MalDatabase provides programmatic access to provide malware datasets and threat intelligence feeds via REST API.

MalShare is a free community-driven repository of malware samples that security researchers upload and share for analysis.

MalwareBazaar is a free platform by abuse.ch where security researchers share malware samples along with metadata like file hashes, tags, and threat actor attribution.

Metacert is a link classification and flagging API that checks URLs against curated threat intelligence to identify phishing, adult content, and malicious sites.

NoPhishy (Exerra Phishing Check) checks URLs against a maintained database of known phishing sites and returns whether the link is flagged as a phishing attempt.

Phisherman provides programmatic access to ip/domain/url reputation via REST API.

Scanii is a cloud-based malware scanning API that accepts file uploads and returns a verdict on whether the file contains threats.

URLhaus by abuse.ch is a free, no-auth API for querying a database of URLs that are actively distributing malware.

URLScan.io scans and screenshots any URL in a sandboxed browser, then returns a detailed report covering the page content, network requests, linked domains, technologies detected, and threat indicators.

VirusTotal scans files and URLs against 70+ antivirus engines in one API call.

Web of Trust scores domains and URLs for trustworthiness and safety based on community ratings.

Améthyste provides programmatic access to generate images for discord users via REST API.

The Art Institute of Chicago API exposes 100,000+ artworks with images, artist bios, and exhibition data—free with no key required.

Colormind generates harmonious 5-color palettes using a machine learning model trained on real design work.

ColourLovers lets you browse millions of community-created color palettes and patterns.

Cooper Hewitt provides programmatic access to smithsonian design museum via REST API.

Dribbble lets you read public design shots, user profiles, and project listings via OAuth.

EmojiHub returns random or category-filtered emojis with their Unicode name, character, and HTML entity.

Europeana searches digitized artworks, books, music, and videos from 3,000+ European cultural institutions.

Harvard Art Museums exposes 250,000+ artworks, artists, and exhibition records with high-res images.

Icon Horse fetches the best available favicon for any website URL with a graceful fallback when none exists.

Iconfinder (now served through the Freepik API) gives access to a massive library of icons and vector graphics you can search, filter by style, and download in various formats.

Icons8 offers a CDN-based icon delivery system where you can embed icons directly in HTML using a simple URL pattern without any API calls or keys.

Lordicon provides a library of high-quality animated icons delivered as Lottie JSON files and web components.

The Metropolitan Museum of Art API provides open access to over 470,000 art objects from the Met collection including paintings, sculptures, and artifacts, along with high-resolution image URLs and rich metadata.

The Noun Project API gives access to a vast library of over 3 million community-created icons covering virtually every concept imaginable.

PHP-Noise generates procedural noise background images (like Perlin noise textures) on demand via a simple URL with query parameters for color, opacity, and tile settings.

Pixel Encounter generates unique random SVG monster/creature icons procedurally, making it great for creating identicons, placeholder avatars, or playful UI elements.

Rijksmuseum provides programmatic access to rijksmuseum data via REST API.

Word Cloud API generates word cloud images from text you provide, with options for colors, fonts, shape masks, and layout.

xColors provides programmatic access to generate & convert colors via REST API.

Auth0 is a developer-friendly identity platform that handles user sign-up, login, social login, and multi-factor authentication so you do not have to build auth from scratch.

GetOTP lets you add one-time password (OTP) verification to your app via SMS, email, or WhatsApp with a few API calls.

Micro User Service provides programmatic access to user management and authentication via REST API.

MojoAuth is a passwordless authentication platform that lets users log in via magic links or one-time codes instead of passwords.

SAWO Labs provides programmatic access to simplify login and improve user experience by integrating passwordless authentication in your app via REST API.

Stytch provides ready-to-use user authentication infrastructure including magic links, OAuth, OTPs, and session management.

Warrant is an authorization API that lets you define and enforce fine-grained access control rules — roles, permissions, and object-level access — without building your own authorization logic.

Bitquery provides GraphQL APIs for querying on-chain data across 40+ blockchains including Ethereum, Solana, and BSC.

Chainlink is a decentralized oracle network that connects smart contracts to real-world data like price feeds, random numbers, and external APIs.

Chainpoint anchors any data hash to the Bitcoin blockchain, creating a tamper-proof proof of existence for documents, records, or any digital content.

Covalent provides programmatic access to multi-blockchain data aggregator platform via REST API.

Etherscan's API gives programmatic access to Ethereum blockchain data — account balances, transaction histories, token transfers, smart contract ABIs, and gas prices.

The Helium API provides access to legacy blockchain data for the Helium IoT network — hotspot locations, earnings, network coverage, and device activity.

NOWNodes provides hosted blockchain node access for 50+ cryptocurrencies via a simple API key — no need to run your own full node for Bitcoin, Ethereum, or other chains.

Steem is a blockchain-based social media platform with a public API for reading posts, comments, votes, account data, and blockchain operations.

The Graph is a decentralized indexing protocol that lets you query Ethereum and other blockchain networks using GraphQL.

Walltime provides programmatic access to to retrieve walltime's market info via REST API.

Watchdata provides a simple JSON-RPC and REST gateway to the Ethereum blockchain, giving you account balances, transaction history, and token data without syncing a node.

A Biblia Digital offers a REST API to access multiple Portuguese Bible versions, chapters, and verses in structured JSON format.

The Bhagavad Gita API provides structured access to all 18 chapters and 700 verses with translations from 21+ authors in Sanskrit, English, and Hindi.

This Bhagavad Gita API from bhagavadgita.io provides OAuth-authenticated access to all chapters and verses with English commentary and multiple translations.

Bhagavad Gita Telugu API delivers all Gita verses in Telugu and Odia languages with no authentication required.

Bible-api.com is a free, no-auth REST API that returns Bible verses and passages in multiple translations using a simple URL pattern.

The British National Bibliography API exposes Linked Data about books published in the UK and Ireland, including titles, authors, ISBNs, and subject classifications.

Crossref Metadata Search provides free REST access to bibliographic metadata for over 140 million scholarly articles, books, and conference papers indexed by DOI.

Ganjoor provides programmatic access to classic persian poetry works including access to related manuscripts, recitations and music tracks via REST API.

Google Books API lets you search millions of books and retrieve volume metadata including cover images, descriptions, and preview links from Google's vast book index.

GurbaniNow provides programmatic access to fast and accurate gurbani restful api via REST API.

Gutendex exposes the full Project Gutenberg catalogue—over 70,000 free ebooks—as a clean JSON API.

Open Library is the Internet Archive's book database covering millions of editions, authors, and subjects.

Penguin Random House's REST web service lets you query their full catalogue for titles, authors, and ISBNs.

PoetryDB serves a curated collection of classic English poems via a simple REST API—searchable by author, title, or first line.

Quran provides programmatic access to restful quran api with multiple languages via REST API.

Quran Cloud provides a RESTful API to fetch individual verses (Ayah), chapters (Surah), sections (Juz), or the complete Quran text with multiple audio recitations and translations.

This community-maintained Quran API hosts the full Quran text in 90+ languages and 400+ translations as static JSON files on GitHub CDN—no rate limits, no key needed.

Rig Veda provides programmatic access to gods and poets, their categories, and the verse meters, with the mandal and sukta number via REST API.

API.Bible aggregates over 2,500 Bible versions across 1,600+ languages from the American Bible Society.

Thirukkural API delivers all 1,330 couplets of the ancient Tamil classic Thirukkural with explanations in both Tamil and English.

Vedic Society provides programmatic access to descriptions of all nouns (names, places, animals, things) from vedic literature via REST API.

Wizard World provides programmatic access to get information from the harry potter universe via REST API.

Wolne Lektury is Poland's national digital library API, giving access to thousands of freely available Polish literary works including full texts, author data, and cover images.

Apache Superset's REST API lets you programmatically manage dashboards, charts, datasets, and database connections in your Superset instance.

Charity Search lets you look up verified US non-profit organizations by name, EIN, or keyword.

Clearbit Logo returns a company logo image by domain name — no scraping required.

Domainsdb.info lets you search registered domain names by keyword, TLD, or zone with no authentication needed.

The Freelancer API lets you post projects, search freelancers, and manage bids and contracts programmatically.

The Gmail API gives you full read/write access to a Gmail inbox via OAuth 2.0 — send messages, read threads, manage labels, and search mail.

Google Analytics Data API (GA4) lets you query sessions, users, and conversion metrics to build custom dashboards or automate reports.

Instatus API lets you programmatically create and update incidents and maintenance windows on your public status page.

Mailchimp API lets you manage email lists, create campaigns, and track subscriber activity.

Mailjet lets you send transactional and marketing emails via a simple REST API using MJML or HTML templates.

Markerapi provides free search access to the USPTO trademark database, letting you check if a brand name is already trademarked.

ORB Intelligence provides programmatic access to company lookup via REST API.

Redash is an open-source data visualization and dashboarding tool that exposes a REST API for managing queries, data sources, and dashboards programmatically.

Smartsheet's REST API lets you read and write spreadsheet-style data including rows, columns, and attachments from an online work management platform.

Square provides programmatic access to easy way to take payments, manage refunds, and help customers checkout online via REST API.

SwiftKanban is a visual project management platform based on Kanban principles, and its API lets you manage cards, workflows, and board configurations programmatically.

The Tenders in Hungary API from tenders.guru delivers publicly available government procurement data for Hungary, including contract values, buyer and supplier names, and tender dates.

The Tenders in Poland API provides structured access to Polish government procurement notices and contract awards from tenders.guru, covering public sector buyers across all regions of Poland.

The Tenders in Romania API by tenders.guru exposes Romanian public procurement data including tender details, contract values, and awarded suppliers, all freely accessible without authentication.

The Tenders in Spain API from tenders.guru delivers Spanish public procurement data in JSON format, covering central government, autonomous communities, and local authorities.

The Tenders in Ukraine API from tenders.guru offers free, unauthenticated access to Ukrainian public procurement data including tender titles, contracting authorities, contract values, and awarded suppliers.

Tomba is an email finding and verification service geared toward B2B sales outreach, letting you look up professional email addresses by name and company domain or verify whether an email address is deliverable.

Trello's REST API gives you full control over boards, lists, and cards, letting you create cards, move them between lists, add attachments, and subscribe to webhooks for real-time events.

Calendarific is a REST API that returns public holidays for over 230 countries and territories, supporting both Gregorian and non-Gregorian calendars.

Checkiday is a holiday data API covering more than 5,000 national days and observances in the United States, including unofficial holidays like National Pizza Day.

Church Calendar (calapi.inadiutorium.cz) is a free, no-auth REST API that returns the Roman Catholic liturgical calendar for any date or month.

The Czech Namedays Calendar API lets you look up the Czech or Slovak nameday (svátek) associated with a given first name, or find whose nameday falls on a specific date.

Festivo is a public holidays API covering more than 60 countries with regional subdivision support, providing both national and state/province-level holidays.

The Google Calendar API allows you to programmatically read, create, update, and delete events on any Google Calendar accessible to the authenticated user.

The Hebcal API provides free Jewish calendar data including Hebrew date conversions, Shabbat candle-lighting times, Jewish holidays, and weekly Torah portion readings.

Holiday API (holidayapi.com) provides historical and current public holiday data for over 100 countries, dating back to 2015.

LectServe is a free REST API that returns Revised Common Lectionary readings — Scripture passages assigned to each Sunday and feast day used by many Protestant denominations.

Nager.Date is a completely free, open-source REST API providing public holidays for over 90 countries with no API key required.

Namedays Calendar provides name day traditions for dozens of countries, letting you look up which names are celebrated on any given date.

Non-Working Days provides ICS calendar files for public holidays and non-working days across many countries, hosted as a structured database on GitHub.

IsDayOff.ru is a minimalist REST API that returns whether a given date is a working day, non-working day, or short (pre-holiday) day for Russia and several CIS countries, as well as the United States.

Abstract's Public Holidays API delivers structured data about national, regional, and religious holidays for countries worldwide.

Russian Calendar API checks whether a specific date is a holiday, working day, or short day in Russia, based on official government decree data.

The UK Bank Holidays API is an official UK government endpoint that returns all bank holidays for England and Wales, Scotland, and Northern Ireland as structured JSON.

AnonFiles provides programmatic access to upload and share your files anonymously via REST API.

BayFiles provides programmatic access to upload and share your files via REST API.

Box is an enterprise cloud content management platform with a comprehensive API for uploading, downloading, organizing, and sharing files programmatically.

ddownload is a file hosting and sharing service that exposes an API for uploading files, checking account stats, and managing stored files programmatically.

Dropbox provides a widely-used REST API for accessing, uploading, and managing files and folders stored in Dropbox accounts, including shared folders and Business team spaces.

File.io is an ephemeral file sharing API that returns a one-time download link after upload — once the file is downloaded, it is automatically deleted from the server.

Filestack is a file handling API that lets you upload, transform, and deliver files from any source — local disk, URL, cloud storage, or social network.

GoFile is a free file hosting API that lets you upload files of any size without an account and receive a generated download link in return.

The Google Drive API lets you read, write, and manage files stored in Google Drive programmatically via OAuth 2.0.

Gyazo is a screenshot hosting API that accepts an image upload and returns a permanent shareable URL with associated metadata like capture time and application info.

Imgbb is a free image hosting API that accepts an image via URL, base64 string, or multipart upload and returns a permanent hosted link along with thumbnail variants.

The OneDrive API (part of Microsoft Graph) lets you read, upload, and manage files in a user's OneDrive storage using OAuth 2.0.

Pantry is a free, no-signup JSON storage API designed for small projects and prototypes that need simple key-value persistence without a database.

Pastebin's API lets you create, read, and delete pastes — snippets of text or code stored at a shareable URL — programmatically.

Pinata is an IPFS pinning service API that lets you upload files to the InterPlanetary File System and keep them persistently accessible by "pinning" them on Pinata's infrastructure.

Quip's API provides programmatic access to collaborative documents and spreadsheets in Quip (a Salesforce product), letting you read thread content, create new documents, and post messages to document threads.

Storj is a decentralized cloud storage platform that splits, encrypts, and distributes files across thousands of independent nodes worldwide.

The Null Pointer provides programmatic access to no-bullshit file hosting and url shortening service via REST API.

Web3 Storage (now operating as Storacha) lets you upload files to a decentralized storage network built on IPFS and Filecoin, receiving a content-addressed CID for each upload.

The Azure Resource Health API lets you query the current and historical health status of individual Azure resources, such as virtual machines, SQL databases, and App Services.

Bitrise is a mobile-first CI/CD platform that automates building, testing, and deploying iOS and Android apps.

Buddy is a CI/CD automation platform focused on developer experience, featuring a visual pipeline builder and over 100 pre-built actions for Docker, Kubernetes, cloud deployments, and notifications.

CircleCI provides programmatic access to automate the software development process using continuous integration and continuous delivery via REST API.

Codeship is a hosted CI platform (now part of CloudBees) that automatically builds and tests your code on every Git push.

Travis CI is one of the original hosted CI services, tightly integrated with GitHub to automatically run test suites on every push or pull request.

Coinlayer delivers real-time and historical exchange rates for over 385 cryptocurrencies, sourced from major exchanges and updated every 60 seconds on paid plans.

0x provides programmatic access to api for querying token and pool stats across various liquidity pools via REST API.

1inch is a decentralized exchange (DEX) aggregator that finds the best swap routes across protocols like Uniswap, SushiSwap, and Curve.

Alchemy Ethereum provides programmatic access to ethereum node-as-a-service provider via REST API.

Binance Spot API provides real-time and historical market data for thousands of cryptocurrency trading pairs on the world's largest crypto exchange by volume.

Bitcambio is a Brazilian cryptocurrency exchange that exposes a public REST API to retrieve all currently traded asset pairs and their market data.

BitcoinAverage aggregates price data from dozens of global cryptocurrency exchanges to produce weighted average prices for Bitcoin and other digital assets.

BitcoinCharts provides financial and technical data about the Bitcoin network, including historical market data from dozens of exchanges worldwide.

Bitfinex is a professional cryptocurrency exchange offering one of the most comprehensive trading APIs for both spot and margin markets.

BitMEX is a derivatives exchange specializing in perpetual swaps and futures contracts for Bitcoin and other cryptocurrencies.

Bittrex provides programmatic access to next generation crypto trading platform via REST API.

Block (formerly block.io) provides a cryptocurrency payment and wallet API that lets developers send and receive Bitcoin and other supported coins programmatically.

Blockchain.com Explorer API provides read access to Bitcoin blockchain data including individual transaction details, block information, and wallet address summaries.

Blockfrost provides a managed API layer for interacting with the Cardano blockchain without running your own node.

Brave NewCoin aggregates real-time and historical price data from over 200 cryptocurrency exchanges to compute market index prices for thousands of assets.

BtcTurk is one of Turkey largest cryptocurrency exchanges, offering a public and authenticated REST API for accessing real-time price data and placing trades.

Bybit provides programmatic access to cryptocurrency data feed and algorithmic trading via REST API.

CoinAPI aggregates market data from hundreds of cryptocurrency exchanges into a single unified REST interface.

The Coinbase API exposes current and historical prices for Bitcoin, Bitcoin Cash, Litecoin, and Ethereum against major fiat currencies.

Coinbase Advanced Trade (formerly Coinbase Pro) provides institutional-grade REST and WebSocket APIs for trading on the Coinbase exchange.

CoinCap delivers real-time cryptocurrency prices and market data for thousands of assets through a straightforward REST API.

CoinDCX is an Indian cryptocurrency exchange offering REST APIs for market data, trading, and account management.

CoinDesk provides programmatic access to coindesk's bitcoin price index (bpi) in multiple currencies via REST API.

CoinGecko provides comprehensive cryptocurrency market data covering 10,000+ coins across 700+ exchanges, including prices, market caps, trading volume, and developer or community statistics.

Coinigy is a multi-exchange cryptocurrency portfolio and charting platform whose API lets you connect to 45+ exchanges through a single authenticated interface.

Coinlib provides programmatic access to crypto currency prices via REST API.

Coinlore offers a free, no-key-required API that returns price, volume, market cap, and ranking data for over 10,000 cryptocurrencies.

CoinMarketCap provides the most widely referenced cryptocurrency market data, covering 9,000+ coins with prices, rankings, market caps, and OHLCV history.

Coinpaprika offers a free, open cryptocurrency data API covering 2,500+ coins with prices, market stats, exchange data, and detailed coin metadata including team and investor information.

CoinRanking offers a REST API that delivers live price, market cap, and ranking data for thousands of cryptocurrencies.

Coinremitter is a crypto payment gateway API that lets you create invoices, generate deposit addresses, and check real-time coin prices across multiple blockchains.

CoinStats is a no-authentication REST API that provides real-time prices, percentage changes, and basic market metrics for thousands of cryptocurrencies.

CryptAPI is a no-key cryptocurrency payment processor API that generates unique deposit addresses and watches for on-chain payments using a simple webhook callback URL.

CryptingUp provides programmatic access to cryptocurrency data via REST API.

CryptoCompare (now served via the CoinDesk Data API) provides one of the most comprehensive free cryptocurrency datasets, including multi-exchange price aggregates, OHLCV historical candles, orderbook depth, and social sentiment signals.

CryptoMarket exposes the full trading functionality of the Cryptomkt exchange through a REST and WebSocket API, covering order placement, real-time order book data, trade history, and account management.

Cryptonator provides programmatic access to cryptocurrencies exchange rates via REST API.

dYdX is a decentralised perpetual futures exchange, and its API gives developers programmatic access to market data, order books, and — with authentication — order management and account information.

Ethplorer is a free REST API for exploring the Ethereum blockchain, offering detailed information about ERC-20 token holdings, wallet balances, transaction history, and token contract metadata.

EXMO is a UK-based cryptocurrency exchange with a REST API covering public market data (tickers, order books, trade history) as well as authenticated endpoints for placing orders, managing your account, and handling deposits and withdrawals.

FTX was a major cryptocurrency derivatives and spot exchange whose REST and WebSocket APIs provided access to futures, options, and spot markets.

Gate.io is a comprehensive cryptocurrency exchange API offering access to spot, margin, and futures trading data.

Gemini is a U.S.-regulated cryptocurrency exchange API that provides public market data without authentication, making it beginner-friendly.

Hirak Exchange Rates delivers real-time foreign currency and cryptocurrency exchange rates, covering 162 fiat currencies and 300+ cryptocurrencies updated every five minutes.

Huobi (now HTX) is a major global cryptocurrency exchange API headquartered in Seychelles, offering access to hundreds of spot and futures trading pairs.

icy.tools (now powered by QuickNode) is a GraphQL-based NFT API that provides data on NFT collections, wallet holdings, and historical transaction activity across major blockchains.

Indodax is Indonesia's largest cryptocurrency exchange API, allowing you to trade Bitcoin and dozens of altcoins against the Indonesian Rupiah (IDR).

INFURA provides hosted Ethereum node access via a simple HTTPS API, eliminating the need to run your own full node to interact with the Ethereum blockchain.

Kraken is one of the oldest and most trusted U.S.-regulated cryptocurrency exchanges, offering a robust REST API for accessing real-time market data, account management, and order execution.

KuCoin is a global cryptocurrency trading platform API offering access to hundreds of spot, margin, and futures trading pairs.

Localbitcoins provides programmatic access to p2p platform to buy and sell bitcoins via REST API.

Mempool.space is a Bitcoin blockchain explorer API that focuses on real-time transaction fee estimation and mempool (pending transaction pool) analytics.

MercadoBitcoin is Brazil's largest cryptocurrency exchange and offers a public API for retrieving real-time and historical market data for Bitcoin, Ethereum, Litecoin, and other coins traded on the platform.

Messari provides comprehensive data on thousands of cryptocurrency assets, including prices, market caps, and on-chain metrics.

Nexchange is an automated cryptocurrency exchange service API that lets you programmatically create and track currency swap orders.

Nomics provides programmatic access to historical and realtime cryptocurrency prices and market data via REST API.

NovaDax is a cryptocurrency exchange API that gives access to real-time market data, order book information, and trading management features.

OKEx provides programmatic access to cryptocurrency exchange based in seychelles via REST API.

Poloniex is a US-based digital asset exchange offering API access to real-time market data, order management, and account features.

The Solana JSON RPC API allows developers to interact directly with the Solana blockchain to read account balances, submit transactions, and query on-chain data.

The Technical Analysis API provides cryptocurrency price data along with pre-calculated technical indicators like RSI, MACD, and moving averages.

VALR is a South African cryptocurrency exchange that offers a comprehensive API for market data, account management, and trading.

WorldCoinIndex provides cryptocurrency price data and market information for a large number of coins and tokens.

ZMOK provides Ethereum JSON-RPC API access and Web3 provider services, allowing developers to interact with the Ethereum blockchain without running their own node.

Currencylayer provides reliable exchange rate and currency conversion data for over 168 world currencies using an easy-to-use REST API.

Exchangerate.host provides free foreign exchange and cryptocurrency rates via a simple REST API, covering 170+ currencies and major crypto assets.

Exchangeratesapi.io provides real-time and historical foreign exchange rates for 170+ currencies, returned as JSON.

Fixer is a widely-used currency exchange and conversion API providing real-time, intraday, and historical exchange rates for 170+ currencies.

1Forge provides real-time forex (foreign exchange) market data via a REST API, covering currency pairs, conversion rates, and market status.

Amdoren provides a free currency conversion API supporting over 150 currencies with daily updated exchange rates.

The Bank of Russia XML API provides official daily exchange rates for foreign currencies against the Russian Ruble, published by the Central Bank of the Russian Federation.

Currency-api is a free, open-source currency exchange rates API hosted on GitHub with no rate limits, no authentication, and support for 150+ currencies.

CurrencyFreaks provides current and historical currency exchange rates for 150+ currencies via a REST API.

CurrencyScoop (now CurrencyBeacon) provides real-time and historical exchange rates for 170+ currencies and cryptocurrencies via a REST API.

The Czech National Bank (CNB) publishes official daily exchange rates for 30+ currencies against the Czech Koruna (CZK) as a plain XML file.

Economia.Awesome is a free Brazilian API that provides real-time and historical currency exchange rates for dozens of currency pairs, including BRL (Brazilian Real) against USD, EUR, BTC, and more.

ExchangeRate-API delivers accurate foreign exchange rates for 160+ currencies, sourced from major financial data providers and updated hourly.

Frankfurter is an open-source currency data API backed by the European Central Bank (ECB) exchange rate dataset, providing rates for 33 major currencies updated every weekday.

FreeForexAPI provides programmatic access to real-time foreign exchange rates for major currency pairs via REST API.

The National Bank of Poland (NBP) API is an official government data source providing daily exchange rates for 35+ currencies relative to the Polish Zloty (PLN), published on each banking day.

VATComply.com provides programmatic access to exchange rates, geolocation and vat number validation via REST API.

VATlayer is a REST API for validating EU VAT numbers in real time against official EU VIES (VAT Information Exchange System) data, returning company name, address, and registration status.

Lob.com provides a US Address Verification API that validates, standardizes, and geocodes US mailing addresses using USPS data, ensuring mail deliverability and cleaning up address databases.

Postman Echo is a free HTTP test server that mirrors back exactly what you send — headers, query parameters, body, cookies, and request method — making it invaluable for debugging API clients and understanding HTTP behavior without needing a real backend.

PurgoMalum is a free, no-auth REST API for filtering profanity and obscene words from text, returning a cleaned version with offensive terms replaced by asterisks or a custom fill character.

Smarty's US Autocomplete Pro API provides real-time US address suggestions as users type, returning up to 10 valid USPS-deliverable address candidates per query to reduce data entry errors and speed up checkout flows.

Smarty's US Extract API scans any block of unstructured text — emails, documents, web pages — and extracts all US postal addresses it finds, then validates each one against USPS data for deliverability.

The Smarty US Street Address API validates and enriches US postal addresses in real time, returning standardized components like delivery line, city, state, ZIP+4, and county FIPS code.

Userstack is a User-Agent string parsing API that detects browser type, version, operating system, and device category from a raw UA string in real time.

24 Pull Requests is a community initiative that runs every December to encourage developers to contribute to open source projects.

Agify.io is a free API that predicts the likely age of a person based solely on their first name, using a database of over 350 million historical records.

API Grátis is a Brazilian API aggregator that bundles multiple free utility services including CEP (postal code) lookup, CNPJ (company registry) data, vehicle plate information, and more — all under a single authentication token.

ApicAgent parses User-Agent strings into structured device and browser information, returning details like browser name, version, OS, device type, and whether the client is a bot.

ApiFlash provides a REST API that captures full-page or viewport screenshots of any public URL using a headless Chrome browser, returning the image as a PNG, JPEG, or WebP file.

APIs.guru maintains a crowd-sourced directory of OpenAPI (Swagger) specification files for hundreds of public web APIs, all normalized to OpenAPI 3.0 format.

Azure DevOps REST API provides programmatic access to all Azure DevOps services including work items, repositories, pipelines, test plans, and artifact feeds.

Base provides programmatic access to building quick backends via REST API.

Beeceptor lets you create a mock REST API endpoint in seconds directly from your browser, without writing any server code.

The Bitbucket REST API (v2) provides programmatic access to Bitbucket Cloud repositories, pull requests, pipelines, and user accounts, enabling you to automate code review workflows and integrate Bitbucket into your CI/CD toolchain.

Blague.xyz provides programmatic access to la plus grande api de blagues fr/the biggest fr jokes api via REST API.

Blitapp is a screenshot-as-a-service API that lets you capture full-page or viewport screenshots of any web page on a schedule, then automatically sync them to cloud storage like Dropbox or Google Drive.

Blynk Cloud is an IoT platform API that allows you to read and write values to virtual pins on hardware devices (such as Arduino or Raspberry Pi) connected to the Blynk server.

Bored provides programmatic access to find random activities to fight boredom via REST API.

Brainshop.ai provides programmatic access to make a free a.i brain via REST API.

Browshot is a screenshot API that captures web pages rendered in real browsers (Chrome, Firefox) at any screen resolution or as any device type, including mobile and tablet.

The CDNJS API provides metadata about JavaScript and CSS libraries hosted on cdnjs.com, one of the largest open source CDN networks.

Changelogs.md aggregates and structures changelog data from popular open source projects hosted on GitHub, making it easy to fetch and display version history programmatically.

Ciprand is a lightweight public API for generating cryptographically secure random strings, useful for creating tokens, nonces, salts, and test data without implementing your own randomness logic.

The Cloudflare Trace API exposes request metadata collected by Cloudflare's edge network, including your public IP address, country code, datacenter IATA code, HTTP version, TLS version, and user agent—all in a single request.

Codex provides programmatic access to online compiler for various languages via REST API.

The Contentful Images API lets you retrieve, resize, crop, convert format, and apply other transformations to images stored in your Contentful media library by simply appending query parameters to the image URL.

CORS Proxy acts as a middle-man server that forwards your HTTP requests to external APIs, stripping restrictive CORS headers so browsers can access them without cross-origin errors.

CountAPI provides programmatic access to free and simple counting service.

The Databricks REST API lets you programmatically manage clusters, notebooks, jobs, and workspaces on the Databricks platform — a cloud-based analytics and machine learning environment built on Apache Spark.

The DigitalOcean Status API provides real-time and historical data on the operational status of all DigitalOcean services, including Droplets, Managed Databases, Kubernetes, Spaces, and more.

The Docker Hub API lets you programmatically interact with Docker Hub registries — searching repositories, pulling image metadata, managing tags, and automating image builds.

DomainsDB.info provides a searchable database of registered domain names, allowing you to find all domains containing specific keywords, phrases, or patterns across various TLDs.

ExtendsClass JSON Storage is a simple REST API that lets you create, read, update, and delete JSON objects online without any backend setup.

GeekFlare provides programmatic access to provide numerous capabilities for important testing and monitoring methods for websites via REST API.

Genderize.io predicts the likely gender of a given first name using a statistical model trained on a database of over 100 million names from around the world.

GETPing provides programmatic access to trigger an email notification with a simple get request via REST API.

The Ghost Content API provides read-only access to posts, pages, tags, authors, and settings published on a Ghost CMS instance — letting you pull your blog content into any frontend, app, or static site generator.

The GitHub REST API gives you programmatic access to nearly everything on GitHub — repositories, issues, pull requests, commits, users, organizations, GitHub Actions, and more.

The GitLab REST API provides comprehensive programmatic control over GitLab projects, including repositories, merge requests, pipelines, issues, CI/CD variables, and user management.

Gitter provides programmatic access to chat for developers via REST API.

Glitterly is an image generation API that lets you create customized graphics, banners, and visual assets programmatically.

The Google Docs API provides full programmatic control over Google Docs documents, including reading content, inserting text, applying styles, and managing document structure.

Google Firebase provides a suite of backend services for mobile and web applications, including a real-time database, authentication, cloud storage, and cloud messaging, all accessible via REST APIs.

The Google Fonts API provides metadata about all font families hosted on Google Fonts, including available variants, subsets, and file download URLs.

The Google Keep API allows applications to read and create notes in Google Keep, including text notes, lists, and notes with attachments.

The Google Sheets API enables full programmatic control of spreadsheets — reading cell data, writing values, applying formatting, managing sheets, and creating charts.

The Google Slides API allows you to create, read, and modify Google Slides presentations programmatically, including managing slides, text boxes, images, shapes, and speaker notes.

Gorest is a free online REST API service designed for testing, prototyping, and development — it provides fake but realistic user, post, comment, and todo data via standard CRUD endpoints.

Hasura is a GraphQL and REST API engine that auto-generates a powerful API layer on top of your PostgreSQL, MySQL, or other supported databases with built-in authorization, subscriptions, and remote joins.

The Heroku Platform API provides full programmatic control over your Heroku apps, dynos, add-ons, pipelines, and configuration variables.

host-t.com provides DNS lookups over plain HTTP GET requests, making it easy to query DNS records without specialized libraries.

Host.io aggregates domain data including DNS records, web technology fingerprints, backlinks, and related domains into a single REST API.

HTTP2.Pro is a testing service that lets you verify whether a client or server supports the HTTP/2 protocol via a simple API call.

Httpbin is a classic developer tool that echoes back HTTP requests in structured JSON, making it invaluable for testing HTTP clients, inspecting headers, and debugging network code.

Httpbin Cloudflare provides programmatic access to a simple http request & response service with http/3 support by cloudflare via REST API.

Hunter (hunter.io) provides APIs to find and verify professional email addresses associated with any domain, making it a go-to tool for sales prospecting and lead enrichment.

IBM Text to Speech converts written text into natural-sounding audio using deep neural network models that support multiple languages and voices.

Icanhazepoch is a minimalist API that returns the current Unix epoch timestamp as a plain integer, with no frills and no authentication required.

Icanhazip returns your public IP address as a plain text string with no authentication, parsing, or configuration needed.

The IFTTT Connect API allows developers to integrate their services with IFTTT automation platform, enabling users to create "if this, then that" automations that connect thousands of apps and IoT devices.

Image-Charts generates chart images and QR codes on-the-fly via a simple GET request URL, with chart parameters encoded directly into the query string.

import.io is a web scraping and data extraction API that lets you retrieve structured data from any website or RSS feed programmatically.

ip-fast.com is a lightweight, no-auth API that returns the caller's IP address along with associated country and city information.

IP2WHOIS provides a simple REST API to look up WHOIS registration data for any domain name, including registrar info, creation date, expiry date, and registrant details.

ipfind.io is a geolocation API that returns detailed location data for any IP address or domain name, including country, region, city, timezone, and ASN information.

IPify is an extremely simple, free API with no authentication required that returns your current public IP address as plain text or JSON.

IPinfo is a free, no-auth-required IP geolocation and network intelligence API that returns rich data about any IP address including location, organization, ASN, and timezone.

jsDelivr's Data API provides programmatic access to package metadata and download statistics for npm, GitHub, and WordPress packages hosted on the jsDelivr CDN.

JSON 2 JSONP is a free, no-auth service that acts as a JSONP proxy, converting any JSON endpoint into a JSONP response on the fly to bypass browser cross-domain restrictions in legacy applications.

JSONbin.io is a free cloud-based JSON storage and hosting service that lets you create, read, update, and delete JSON data bins via a simple REST API.

Kroki is a free, open-source API that converts plain-text diagram descriptions into images (SVG, PNG, PDF) supporting over 20 diagram types including Mermaid, PlantUML, Graphviz, and more.

License-API is an unofficial REST wrapper around choosealicense.com that lets you fetch structured data about open-source licenses by their SPDX identifier.

Logs.to provides programmatic access to generate logs via REST API.

Lua Decompiler provides programmatic access to online lua 5.1 decompiler via REST API.

macaddress.io resolves any MAC address or OUI (Organizationally Unique Identifier) prefix to the hardware vendor that manufactured the network interface.

Micro DB provides programmatic access to simple database service via REST API.

MicroENV is a hosted fake REST API that returns realistic-looking mock data for common entities such as users, posts, and todos, making it ideal for front-end prototyping without a real backend.

Mocky provides programmatic access to mock user defined test json for rest api endpoints via REST API.

MY IP is a straightforward API that returns the public IP address of the caller along with associated geolocation metadata such as country, city, ISP, and coordinates.

Nationalize.io predicts the likely nationality of a person based on their first name by analyzing a large database of name-to-country associations.

The Netlify API provides full programmatic control over your Netlify account, including deploying sites, managing custom domains, retrieving build logs, and configuring environment variables.

NetworkCalc provides programmatic access to network calculators, including subnets, dns, binary, and security tools via REST API.

The npm Registry API exposes package metadata for every module published to the npm ecosystem, including version history, author information, download counts, and README content.

OneSignal provides programmatic access to self-serve customer engagement solution for push notifications, email, sms & in-app via REST API.

Open PageRank provides a free alternative to Google's original PageRank score for any domain, calculated from the Common Crawl dataset of billions of web pages.

OpenAPIHub is an all-in-one API management platform that hosts, documents, and discovers APIs using the OpenAPI specification.

OpenGraphr is a lightweight API that extracts Open Graph metadata from any publicly accessible URL, returning properties such as title, description, image, and site name in a clean JSON format.

oyyi is a versatile utility API that lets developers generate fake/test data, convert and optimize images and videos, compress PDFs, and create thumbnails — all without authentication.

PageCDN exposes a public API to query its CDN library catalog — including JavaScript packages, CSS frameworks, and web fonts — so developers can look up available versions and generate optimized CDN URLs programmatically.

The Postman API provides programmatic access to your Postman workspace — letting you manage collections, environments, mocks, monitors, and API schemas without opening the Postman desktop or web app.

ProxyCrawl (now Crawlbase) is an anti-bot scraping and crawling API that routes requests through rotating residential and datacenter proxies, handles CAPTCHAs automatically, and returns the rendered HTML of JavaScript-heavy pages.

ProxyKingdom provides programmatic access to rotating proxy api that produces a working proxy on every request via REST API.

Pusher Beams is a managed push notification API that enables developers to send reliable push notifications to Android and iOS devices without managing their own FCM/APNs infrastructure.

The QRtag QR Code API generates clean, scan-ready QR code images from any URL or text with a single GET request — no authentication or signup required.

The goQR.me QR Code API is a straightforward REST service for generating and decoding QR codes — you can produce a QR image from any text or URL with a single GET request and receive a PNG back, or POST an image to decode its contents.

QRcode Monkey provides a free API to generate highly customizable QR codes with logos, custom colors, and various dot styles — far beyond the plain black-and-white output of simpler QR APIs.

QuickChart turns Chart.js configuration objects into chart images via a simple GET or POST request — no JavaScript runtime or canvas library required.

Random Stuff provides programmatic access to can be used to get ai response, jokes, memes, and much more at lightning-fast speed via REST API.

Rejax provides a reverse AJAX (server-sent events / long-polling) infrastructure as a service, allowing server-side applications to push real-time updates to connected web clients without those clients needing to constantly poll your backend.

ReqRes is a free, hosted fake REST API designed for testing and prototyping front-end applications.

RSS feed to JSON is a free, no-auth API that converts any RSS feed URL into structured JSON data.

SavePage.io provides a RESTful API for capturing full-page screenshots of any desktop or mobile website.

ScrapeNinja is a web scraping API that uses real Chrome browser fingerprints and residential proxies to bypass anti-bot protections.

ScraperApi is a web scraping infrastructure service that handles proxy rotation, browser rendering, and CAPTCHA solving so developers can extract data from websites with a simple GET request.

scraperBox provides programmatic access to undetectable web scraping api via REST API.

Scrapestack is a real-time web scraping and proxy REST API that routes requests through a global pool of residential and datacenter proxies.

ScrapingAnt is a headless Chrome-based web scraping API that renders JavaScript-heavy pages and rotates proxies automatically.

ScrapingDog is a proxy-based web scraping API that handles IP rotation, CAPTCHAs, and JavaScript rendering to help developers reliably extract data from websites.

AbstractAPI's Website Screenshot API lets developers programmatically capture full-page or viewport screenshots of any website URL and receive the image directly in the response.

ScreenshotAPI.net is a developer-friendly API for generating pixel-perfect screenshots of any website, supporting custom viewport sizes, full-page capture, and mobile device emulation.

Serialif Color is a free, no-auth API that converts colors between formats like HEX, RGB, and HSL.

serpstack delivers real-time Google Search results through a simple REST API, returning organic results, ads, featured snippets, and more.

Sheetsu (now SheetDB) lets you turn any Google Spreadsheet into a REST API with full CRUD support.

SHOUTCLOUD is a fun, no-auth API that converts any text string into ALL CAPS, delivered as a humorous "ALL-CAPS AS A SERVICE." It requires no authentication and responds instantly, making it a great first API for absolute beginners learning how HTTP POST requests work.

Sonar provides a fast DNS enumeration API built on Project Sonar's large passive DNS dataset, allowing you to look up subdomains associated with any domain.

SonarQube provides a REST API for its code quality and security analysis platform, letting you programmatically retrieve metrics, issues, and quality gate statuses for your projects.

The StackExchange API gives you programmatic access to all Stack Overflow and Stack Exchange network sites, including questions, answers, users, tags, and comments.

Statically is a free CDN for developers that accelerates static assets from GitHub, GitLab, npm, and WordPress, with no account or API key required.

Supportivekoala is an API that auto-generates custom images by filling in templates with dynamic text or data, returning a ready-to-use image URL.

Tyk provides programmatic access to api and service management platform via REST API.

Wandbox provides programmatic access to code compiler supporting 35+ languages mentioned at wandbox.org via REST API.

WebScraping.AI is a web scraping API that handles JavaScript rendering, proxy rotation, and CAPTCHA bypassing automatically, so you get clean HTML or text from any webpage with a single request.

ZenRows is a web scraping API that automatically bypasses anti-bot protections, CAPTCHAs, and IP bans so you can extract data from any website.

Chinese Character Web is a free API providing definitions, stroke counts, and pronunciations for Chinese characters without requiring an API key.

Chinese Text Project offers a free API to access a massive digital library of pre-modern Chinese texts, including classics like the Analects and Tao Te Ching.

Collins Dictionary API gives developers access to comprehensive bilingual dictionary and thesaurus data for multiple language pairs, including English, Spanish, French, and more.

Free Dictionary provides programmatic access to definitions, phonetics, pronounciations, parts of speech, examples, synonyms via REST API.

Indonesia Dictionary provides programmatic access to indonesia dictionary many words via REST API.

Lingua Robot is a dictionary API that provides word definitions, pronunciations, synonyms, antonyms, and related forms for English words via a clean JSON REST interface.

Merriam-Webster's Dictionary API provides authoritative English dictionary and thesaurus data from one of the most trusted publishers in the United States.

OwlBot provides programmatic access to definitions with example sentence and photo if available via REST API.

The Oxford Dictionaries API provides access to the Oxford English Dictionary's extensive lexical data, including definitions, pronunciations, etymologies, and usage examples.

Synonyms.com API provides synonym, antonym, and thesaurus data for English words, making it useful for writing assistants, word games, and vocabulary tools.

Wiktionary's API gives free access to the entire collaboratively-edited dictionary, covering definitions, pronunciations, etymology, and translations for words in hundreds of languages.

Wordnik is a comprehensive English dictionary API offering definitions, pronunciations, example sentences, related words, and frequency data sourced from a large corpus of text.

Words API gives you instant access to definitions, synonyms, antonyms, examples, and more for over 150,000 English words via a simple REST interface.

Airtable's REST API lets you read, create, update, and delete records in any Airtable base as if it were a flexible database.

Api2Convert is an online file conversion API that supports converting between hundreds of formats including documents, images, audio, and video files.

The pdflayer API by apilayer converts any HTML snippet or public URL into a high-quality PDF file with a simple GET or POST request.

The Asana API gives you full programmatic access to your Asana workspace — tasks, projects, users, comments, and more.

The ClickUp API provides access to tasks, spaces, folders, lists, goals, and time-tracking data within your ClickUp workspace.

Clockify is a free time-tracking API that lets you manage workspaces, projects, clients, and time entries programmatically.

CloudConvert is a powerful file conversion API that supports over 200 formats across documents, images, audio, video, spreadsheets, and more.

The Cloudmersive Convert API lets you convert documents, images, and web pages between formats — including Word to PDF, HTML to image, and more — with a simple REST call.

Code::Stats is a free API that tracks programming activity by language, recording XP points earned through coding.

CraftMyPDF lets you generate PDF documents programmatically from reusable templates using a drag-and-drop editor.

Flowdash is a no-code workflow automation platform that also exposes a REST API for triggering and managing business workflows programmatically.

Html2PDF is a REST API that converts HTML markup or any public web URL into a downloadable PDF document.

iLovePDF API provides a full suite of PDF operations including conversion, merging, splitting, compressing, and adding page numbers, all accessible through a simple REST interface.

The JIRA REST API allows you to programmatically manage issues, projects, sprints, and workflows in Atlassian JIRA.

Mattermost is an open-source messaging platform, and its REST API lets you build bots, integrations, and automation on top of it.

Mercury provides programmatic access to web parser via REST API.

Monday provides programmatic access to programmatically access and update data inside a monday.com account via REST API.

The Notion API enables you to read and write pages, databases, and blocks in Notion workspaces programmatically.

PandaDoc API lets you create, send, and track documents and e-signature requests programmatically.

Pocket provides programmatic access to bookmarking service via REST API.

Podio is a collaborative work management platform with a REST API that lets you manage apps, items, and workspaces programmatically.

PrexView converts structured XML or JSON data into formatted PDF documents, HTML pages, or images using reusable design templates.

Restpack is a powerful API suite that lets you capture screenshots of websites, convert HTML to PDF, and extract content from web pages.

Todoist API gives you programmatic access to one of the most popular task management apps, letting you create, read, update, and delete tasks, projects, and labels.

The Smart Image Enhancement API uses AI super-resolution algorithms to upscale and enhance images, adding fine details that make low-resolution images look crisp at larger sizes.

Vector Express is a free, no-auth API for converting vector and raster files between formats such as SVG, PDF, DXF, EPS, and PNG.

WakaTime automatically tracks how much time you spend coding in your editor and exposes this data through a public API.

Zube is a full-stack project management platform with a REST API that lets you manage sprints, cards, workspaces, and team members programmatically.

mailboxlayer is an email validation API that checks whether an email address is syntactically correct, has a valid MX record, and is not a disposable address.

Cloudmersive Validate is a comprehensive validation API that can verify email addresses, phone numbers, VAT numbers, and domain names in a single platform.

Disify is a free, no-auth API that checks whether an email address or domain belongs to a known disposable or temporary email service.

DropMail provides a GraphQL API for creating and managing temporary email inboxes, letting you generate disposable addresses and receive real emails without registration.

Abstract API Email Validation checks whether an email address is deliverable, properly formatted, and not from a disposable or spam-trap domain.

EVA provides programmatic access to validate email addresses via REST API.

Guerrilla Mail provides a REST API for creating and reading disposable temporary email addresses, useful for testing email flows without exposing real inboxes.

ImprovMX is an email forwarding service with a REST API that lets you programmatically manage domains and forwarding rules — mapping email aliases to real destination addresses.

Kickbox provides a free, no-auth email verification endpoint that checks whether an email address is deliverable by performing syntax validation, domain MX lookup, and disposable address detection.

mail.gw is a REST API for creating and managing temporary 10-minute email addresses with full inbox access, all without authentication for basic use.

mail.tm is a temporary email service API that creates persistent (but disposable) email accounts accessible via a REST interface using JWT authentication.

MailboxValidator performs multi-layered email address validation including syntax checking, DNS/MX record lookup, disposable email detection, and SMTP mailbox verification to help improve email list deliverability.

MailCheck.ai (powered by UserCheck) is a free API that detects whether an email domain belongs to a known temporary or disposable email provider, helping prevent fake sign-ups without requiring authentication.

Mailtrap provides programmatic access to a service for the safe testing of emails sent from the development and staging environments via REST API.

SendGrid (now part of Twilio) is an industry-standard cloud email API for sending transactional and marketing emails at scale, with support for SMTP relay and REST API delivery.

Sendinblue provides programmatic access to a service that provides solutions relating to marketing and/or transactional email and/or sms via REST API.

Verifier provides programmatic access to verifies that a given email is real via REST API.

chucknorris.io is a free JSON API serving a curated database of Chuck Norris jokes, with endpoints for fetching random jokes, filtering by category, and searching joke text.

Corporate Buzz Words is a fun REST API that generates random corporate jargon and business buzzwords.

Excuser provides programmatic access to get random excuses for various situations via REST API.

Fun Fact API randomly selects and returns a true, interesting fact from the FFA (Fun Facts Archive) database.

Imgflip API lets you retrieve a list of popular meme templates and programmatically create memes by adding captions to them.

Meme Maker API is a simple REST interface for creating custom memes by combining images with user-supplied text.

NaMoMemes is a fun, open-source REST API that serves meme images related to Indian Prime Minister Narendra Modi.

Random Useless Facts API delivers genuinely true but delightfully pointless facts in JSON or plain text format.

Techy API generates random tech-savvy-sounding phrases that are perfect for populating placeholder content, building parody apps, or adding humor to developer tools.

Yo Momma Jokes API is a simple REST endpoint that returns random "Yo Momma" jokes in JSON format.

BreezoMeter Pollen API (now part of Google Maps Platform) provides daily pollen forecast data including pollen type, index values, and risk levels for a specific geographic location.

Carbon Interface API calculates estimated CO2 emissions for common activities such as electricity usage, flights, vehicle travel, and shipping.

Climatiq is an API for calculating carbon emissions and environmental footprint across a wide range of activities including travel, energy use, and shipping.

Cloverly provides programmatic access to api calculates the impact of common carbon-intensive activities in real time via REST API.

CO2 Offset API calculates and validates the carbon footprint of electricity consumption using the Sustainable Scope 2 framework.

Danish data service Energi provides programmatic access to open energy data from energinet to society via REST API.

GrünstromIndex (Green Power Index) provides real-time and forecast data about the proportion of renewable energy in the German electricity grid.

IQAir API provides real-time air quality index (AQI) data and weather conditions for cities and stations worldwide, powered by the IQAir sensor network.

Luchtmeetnet API provides real-time and predicted air quality measurements from the official Dutch national air quality monitoring network (RIVM).

National Grid ESO provides programmatic access to open data from great britain’s electricity system operator via REST API.

OpenAQ is an open-source platform providing access to air quality data aggregated from thousands of government and research-grade monitoring stations worldwide.

PM2.5 Open Data Portal provides free access to low-cost PM2.5 (fine particulate matter) sensor data from the LASS community network across Asia, particularly Taiwan.

PM25.in is a Chinese air quality API providing real-time PM2.5, AQI, and related pollution data for cities across China.

PVWatts is a NREL (National Renewable Energy Laboratory) API that estimates the energy production of grid-connected photovoltaic (solar panel) systems anywhere in the world.

Srp Energy API provides hourly electricity usage data for customers of SRP (Salt River Project), a utility provider in Arizona, USA.

The UK Carbon Intensity API provides official real-time and forecast carbon intensity data for Great Britain's electricity grid, developed by National Grid.

Website Carbon estimates the carbon footprint of loading any web page by analyzing its data transfer size and hosting type.

The Eventbrite API lets you search, create, and manage events on the Eventbrite platform.

The SeatGeek API allows you to search for live events, venues, and performers across sports, concerts, and theater.

The Ticketmaster API provides access to a massive catalog of live events, artists, and venues worldwide, including detailed ticketing data.

Marketstack is a real-time, intraday, and historical stock market data API covering 70 plus global exchanges.

Aletheia provides financial data including insider trading filings, earnings call transcripts, and financial statements for US-listed companies.

Alpaca provides real-time and historical market data for US equities and ETFs, along with commission-free trading capabilities.

Alpha Vantage delivers free real-time and historical stock, forex, and cryptocurrency data through a simple REST API.

Banco do Brasil provides a suite of financial APIs covering transactions, payments, PIX transfers, and account data for Brazil's largest public bank.

Bank Data API lets you instantly validate IBAN and SWIFT/BIC numbers to make sure bank account details are correct before processing a payment.

Billplz is a payment platform API focused on the Malaysian market that lets you create bills and collect payments online.

Binlist gives you free access to a database of Bank Identification Numbers (BINs), the first 6-8 digits of any credit or debit card number that identify the issuing bank and card type.

Boleto.Cloud is a Brazilian payment API that lets you generate boletos — the popular Brazilian bank slip payment method used widely for bills and online purchases.

Citi's partner API provides access to Citigroup banking account and statement data, enabling developers to build financial apps that read account balances, transactions, and statements on behalf of authorized users.

Econdb provides free access to global macroeconomic data including GDP, inflation, unemployment, and hundreds of other economic indicators from official sources like central banks and statistical agencies.

The U.S.

Finage is a financial data provider offering real-time and historical data for stocks, forex currencies, cryptocurrencies, indices, and ETFs through a single API.

Financial Modeling Prep (FMP) provides a comprehensive API for real-time and historical stock market data, including income statements, balance sheets, stock prices, earnings, and more for thousands of companies.

Finnhub is a popular financial API offering real-time stock quotes, company fundamentals, news, forex rates, and cryptocurrency data through both REST and WebSocket connections.

FRED provides programmatic access to economic data from the federal reserve bank of st.

Front Accounting APIs provide programmatic access to an open-source accounting system designed for small businesses.

Hotstoks provides programmatic access to stock market data powered by sql via REST API.

IEX Cloud provides programmatic access to realtime & historical stock and market data via REST API.

IG is a financial data API providing access to spreadbetting and CFD (Contract for Difference) market data.

The Indian Mutual Fund API gives you free access to the complete history of all mutual funds registered in India.

Intrinio is a financial data platform that provides a wide range of data feeds including stock prices, fundamentals, options, and economic indicators.

Klarna provides programmatic access to klarna payment and shopping service via REST API.

MercadoPago is a leading payment platform in Latin America, and its API lets you integrate payment processing, refunds, and subscription billing into your app.

Mono is an African open banking API that lets you connect to users bank accounts to access transaction history, balances, and identity data.

Moov is a modern payments infrastructure API that makes it straightforward for platforms to send, receive, and store money.

Nordigen provides programmatic access to connect to bank accounts using official bank apis and get raw transaction data via REST API.

OpenFIGI is a free API from Bloomberg that lets you look up financial instrument identifiers (FIGIs) for equities, indices, futures, and options.

Plaid is a widely-used financial data API that lets your application securely connect to users bank accounts to access transactions, balances, and identity data.

Polygon.io is a comprehensive market data API providing real-time and historical stock, forex, and cryptocurrency data.

Portfolio Optimizer is a free REST API that helps you analyze and optimize investment portfolios using advanced mathematical models.

Razorpay IFSC API lets you look up Indian bank branch details using an 11-character IFSC code — completely free and without authentication.

Real Time Finance is a WebSocket API that streams live stock prices, trade data, and market events directly to your application with minimal latency.

SEC EDGAR Data API provides free access to financial filings, annual reports (10-K), quarterly reports (10-Q), and ownership data for all publicly traded US companies.

SmartAPI by Angel Broking is an Indian stock brokerage API that lets developers build automated trading systems, portfolio trackers, and order management tools for the NSE and BSE markets.

StockData.org provides real-time, intraday, and historical stock market data along with financial news and sentiment analysis through a simple REST API.

Styvio provides real-time and historical stock price data combined with sentiment analysis based on social media and news signals.

Tax Data API by APILayer lets you instantly validate VAT numbers and retrieve tax rate information for countries around the world.

Tradier is a US brokerage API that provides access to equity and options market data including delayed quotes, intraday prices, and historical data going back years.

Twelve Data provides real-time and historical stock, forex, cryptocurrency, and ETF market data through a clean and well-documented REST API.

The VAT Validation API by Abstract API lets you check whether a VAT number is valid and look up current VAT rates for countries in the EU and beyond.

The WallStreetBets API gives you real-time sentiment data extracted from Reddit's r/WallStreetBets community, showing which stocks are being discussed and whether the mood is bullish or bearish.

The YNAB (You Need A Budget) API lets you programmatically read and write data from a user's YNAB budget, including accounts, transactions, and category balances.

The Zoho Books API gives you programmatic access to your Zoho Books accounting data, letting you manage invoices, contacts, expenses, and payments from your own apps.

BaconMockup is a fun, free API that serves placeholder images featuring bacon — great for filling in image slots during web or app development when you just need something visual.

The Chomp API provides detailed nutritional data for millions of grocery products and restaurant menu items, including macros, ingredients, and allergen flags.

The Coffee API is a dead-simple, no-auth service that returns a random high-quality coffee photo every time you call it.

The Edamam Nutrition Analysis API parses natural-language food descriptions such as "1 cup of oatmeal" or "200g chicken breast" and returns detailed nutritional breakdowns including calories, macros, vitamins, and minerals.

The Edamam Recipe Search API lets you search a database of over 2 million recipes filtered by ingredients, diet labels such as vegan or keto, meal type, and cuisine.

Foodish is a fun, free API that returns a random food dish image URL each time you call it.

Fruityvice is a free, no-auth API that provides nutritional and botanical data for dozens of common fruits.

The Kroger API gives developers access to product catalog data, pricing, store locations, and promotions from one of the largest US grocery chains.

The LCBO API provides access to the Liquor Control Board of Ontario product catalog, including wines, spirits, and beers sold in Ontario, Canada.

Open Brewery DB is a free, open-source API that provides data on breweries, cideries, and bottle shops across multiple countries.

Open Food Facts is a free, community-driven database of food products from around the world, containing nutritional facts, ingredients, allergens, and Eco-scores.

PunkAPI provides programmatic access to brewdog beer recipes via REST API.

Rustybeer provides programmatic access to beer brewing tools via REST API.

Spoonacular is a comprehensive food and recipe API that provides recipe search, ingredient data, nutritional analysis, and meal planning features.