Postman Echo API vs Temsor API

Two free Data Validation APIs compared on access, reliability and developer ratings, using data from our daily health checks.

The verdict

Choose Postman Echo API if you want to start without an API key.
Choose Temsor API if you want to call it from browser JavaScript, faster responses.

	Postman Echo API	Temsor API
What it does	Test api server to receive and return value from HTTP method.	Validates Turkish national ID, tax number, IBAN, phone, plate and parses addresses.
Provider	Postman	temsor API
API key	Not needed	Required
HTTPS	Yes	Yes
CORS (browser calls)	Unknown	Yes
Status today	Online · 2932 ms	Online · 668 ms
Uptime (30 days)	Up	Up
Developer rating	Not rated yet	Not rated yet
Price	Free / free tier	Free / free tier

Test api server to receive and return value from HTTP method.

Strengths

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

Temsor SaaS voice platform: number in → managed inbound/IVR, search, orchestra — plus business APIs. Easy UI · number → flow.

Strengths

Prototyping or a tutorial? Pick the one that needs no API key.
Calling from a web page? You need CORS. Otherwise route requests through your own server or a serverless function.
Going to production? Favour HTTPS, a strong uptime record and a provider with clear rate limits and terms. Check each API's docs before you commit.
Still unsure? Both are free to try: send one request to each and compare the data you get back.

Temsor API requires an API key; Postman Echo API doesn't, so Postman Echo API is quicker to try.

Temsor API supports CORS, so front-end JavaScript can call it directly. Call the other from a server.