Postman Echo API alternatives

Test api server to receive and return value from HTTP method. If it doesn't fit your project, here are the 10 best free Data Validation APIs to use instead in 2026, out of 15 in the directory.

For reference, Postman Echo API: No API key needed · HTTPS.

1. 1

   US Autocomplete API

   Online · 976 ms

   Enter address data quickly with real-time address suggestions.

   • Callable from the browser (CORS)
   • HTTPS

   apiKeyHTTPSCORS
2. 2

   US Street Address API

   Online · 559 ms

   Validate and append data for any US postal address.

   • Callable from the browser (CORS)
   • HTTPS

   apiKeyHTTPSCORS
3. 3A

   Attestwire API

   Online · 700 ms

   Validate EN 16931 e-invoices: XRechnung, ZUGFeRD, Factur-X, Peppol BIS.

   • Callable from the browser (CORS)
   • HTTPS

   apiKeyHTTPSCORS
4. 4T

   Temsor API

   Online · 668 ms

   Validates Turkish national ID, tax number, IBAN, phone, plate and parses addresses.

   • Callable from the browser (CORS)
   • HTTPS

   apiKeyHTTPSCORS
5. 5

   US Extract API

   Online · 520 ms

   Extract postal addresses from any text including emails.

   • Callable from the browser (CORS)
   • HTTPS

   apiKeyHTTPSCORS
6. 6

   invowerk API

   Online · 727 ms

   Validate e-invoices (ZUGFeRD, Factur-X, XRechnung, Peppol BIS) and get a validation report.

   • HTTPS

   apiKeyHTTPSCORS ?
7. 7

   PurgoMalum API

   Online · 702 ms

   Content validator against profanity & obscenity.

   • No API key needed

   No authNo HTTPSCORS ?
8. 8

   VATlayer API

   Online · 887 ms

   Free and HTTPS secured JSON API offering instant VAT number validation, reliable EU VAT rates and VAT compliant price calculations for developers & businesses.

   • HTTPS

   apiKeyHTTPSCORS ?
9. 9

   SchemaShield API

   Online · 499 ms

   Read-only preflight for breaking schema changes and downstream query impact.

   • HTTPS

   apiKeyHTTPSCORS ?
10. 10

    Lob.com API

    Online · 2690 ms

    Automate and personalize direct mail at scale while our nationwide print network speeds delivery, controls postage costs, and keeps every send compliant.

    • HTTPS

    apiKeyHTTPSCORS ?

Postman Echo API vs alternatives

Postman Echo API compared with its alternatives

API	API key	HTTPS	CORS	Uptime	Response	Rating
Postman Echo	No	Yes	Unknown	Up	2932 ms	Not rated
US Autocomplete	Required	Yes	Yes	Up	976 ms	Not rated
US Street Address	Required	Yes	Yes	Up	559 ms	Not rated
AAttestwire	Required	Yes	Yes	Up	700 ms	Not rated
TTemsor	Required	Yes	Yes	Up	668 ms	Not rated
US Extract	Required	Yes	Yes	Up	520 ms	Not rated
invowerk	Required	Yes	Unknown	Up	727 ms	Not rated
PurgoMalum	No	No	Unknown	Up	702 ms	Not rated
VATlayer	Required	Yes	Unknown	Up	887 ms	Not rated

See also: best Data Validation APIs · all Data Validation APIs