M
API Matrix

Free Data Validation APIs

2 free APIs in Data Validation that require no authentication. Start building immediately — no API key needed. 7 total Data Validation APIs available.

All Data Validation APIs (7) → Compare Data Validation APIs → Data Validation API Guide →

Postman Echo

⭐ Beginner's Pick
87

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.

No Auth Beginner HTTPS 198ms

PurgoMalum

⭐ Beginner's Pick
72

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.

No Auth Beginner 54ms

Need more Data Validation APIs?

There are 5 more Data Validation APIs that require authentication (API key or OAuth).

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