Attestwire 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 Attestwire API if its data fits your use case better; on access and reliability it's level with US Autocomplete API.
Choose US Autocomplete API if its data fits your use case better; on access and reliability it's level with Attestwire API.

	Attestwire API	US Autocomplete API
What it does	Validate EN 16931 e-invoices: XRechnung, ZUGFeRD, Factur-X, Peppol BIS.	Enter address data quickly with real-time address suggestions.
Provider	Attestwire	Smarty
API key	Required	Required
HTTPS	Yes	Yes
CORS (browser calls)	Yes	Yes
Status today	Online · 700 ms	Online · 976 ms
Uptime (30 days)	Up	Up
Developer rating	Not rated yet	Not rated yet
Price	Free / free tier	Free / free tier

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

EN 16931 validation and generation over HTTP. Errors that teach the regulation.

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 (neither does, so compare their free tiers).
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.

Both require authentication (apiKey and apiKey).