Kickbox API
Overview
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. The open endpoint at open.kickbox.com requires no API key and returns a quick binary verdict, while paid plans offer deeper SMTP verification. It is commonly used in form validation to catch bad emails at point of entry.
Beginner Tip
Kickbox open endpoint needs no API key — just append an email address to the URL and you get an immediate JSON response. It is one of the easiest ways to add basic email validation to a signup form without any registration.
Available Data
Example Response
{
"message_id": "msg_abc123def456",
"status": "delivered",
"to": "[email protected]",
"subject": "Welcome!",
"timestamp": "2025-01-15T10:30:00Z"
} Field Reference
disposable True if the email domain is a known temporary or disposable email provider free True if the email uses a free consumer email provider (e.g., Gmail, Yahoo, Outlook) Implementation Example
const url = "https://open.kickbox.com/";
const response = await fetch(url);
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data); What Can You Build?
Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.
Common Errors & Troubleshooting
Matrix Score Breakdown
Fully tested on Apr 5, 2026
Technical Specifications
Related Tags
Similar APIs
View All →Disify
⭐ Beginner's PickDisify is a free, no-auth API that checks whether an email address or domain belongs to a known disposable or temporary email service.
DropMail
⭐ Beginner's PickDropMail provides a GraphQL API for creating and managing temporary email inboxes, letting you generate disposable addresses and receive real emails without registration.
EVA
EVA provides programmatic access to validate email addresses via REST API.
Guerrilla Mail
⭐ Beginner's PickGuerrilla Mail provides a REST API for creating and reading disposable temporary email addresses, useful for testing email flows without exposing real inboxes.
mail.gw
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.