Postman Echo API vs US Autocomplete 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 US Autocomplete API if you want to call it from browser JavaScript, faster responses.

	Postman Echo API	US Autocomplete API
What it does	Test api server to receive and return value from HTTP method.	Enter address data quickly with real-time address suggestions.
Provider	Postman	Smarty
API key	Not needed	Required
HTTPS	Yes	Yes
CORS (browser calls)	Unknown	Yes
Status today	Online · 2932 ms	Online · 976 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

Enter address data quickly with real-time address suggestions.

Address autocomplete | Use our Autocomplete API to suggest valid addresses in real time as users type. Uses a simple HTTP endpoint.

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.

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

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