M
API Matrix

GetOTP API

Authentication & Authorization / API Key Intermediate HTTPS
Varies by plan (check documentation)
69 Score
Grade C
Visit Official Site Compare Alternatives

Overview

GetOTP lets you add one-time password (OTP) verification to your app via SMS, email, or WhatsApp with a few API calls. You trigger an OTP send with one request and verify the code the user enters with another. It removes the complexity of building OTP delivery infrastructure yourself and supports multiple countries.

💡

Beginner Tip

Sign up at https://otp.dev to get your API key and pick a delivery channel (email is easiest to test). The flow is always: POST /otp/send to send the code, then POST /otp/verify with the code the user enters.

Available Data

Use case: Integrate implement otp flow quickly data into web and mobile applications
GetOTP data via REST API
JSON-formatted response data
Requires API key authentication

Example Response

JSON Response 
{
  "status": "success",
  "data": {
    "result": "Data from GetOTP",
    "description": "Implement OTP flow quickly",
    "timestamp": "2025-01-15T10:00:00Z"
  }
}

Field Reference

status "success" or "error" indicating whether the OTP was sent successfully
otp_id Unique identifier for this OTP session; pass it when verifying the code the user enters
message Human-readable status message or error description

Implementation Example 

// ⚠️ Note: This URL may be a documentation page. Check official docs for actual API endpoint.
const url = "https://otp.dev/en/docs/";
// Replace headers or query params with the values required by this API.
const response = await fetch(url, {
  headers: {
  "X-API-Key": "YOUR_API_KEY"
  }
});
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

401 Unauthorized Missing or incorrect API key in the request
✓ Pass your API key in the X-API-Key header or as the api_key query parameter — check the docs for the expected header name
OTP not received SMS or email delivery failed due to provider issues or incorrect recipient format
✓ Use E.164 format for phone numbers (e.g. +14155552671) and verify the email address is valid; check your GetOTP dashboard for delivery logs
CORS blocked in browser The API does not set CORS headers, blocking browser fetch calls
✓ Always call GetOTP from your backend server; never expose your API key or OTP logic in client-side code

Matrix Score Breakdown

🌐 Reachability 30/30
⚡ Speed 5/20
🔒 Security 15/15
🛠 Developer XP 9/20
✓ Reliability 10/15

Partially tested on Apr 5, 2026

Technical Specifications

Auth API Key
HTTPS REQUIRED
CORS NO
Category Authentication & Authorization
Difficulty Intermediate
Verified: 2026-04-04

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