Postman Echo vs VATlayer

Postman Echo is a keyless sandbox that mirrors whatever you send it back as JSON — headers, query args, form body, cookies, and basic/digest auth attempts — across GET, POST, PUT, DELETE, and PATCH endpoints, plus helpers for testing redirects, delays, streaming, and gzip/deflate encoding. It's built and maintained by the Postman team as the reference backend for their own client tutorials and public collections, so its request/response shapes double as worked examples. There's no signup or key: every route is open, making it a quick target for scripting HTTP-client tests without standing up your own server.

vatlayer checks whether an EU VAT registration number is currently valid and, where the member state's VIES service exposes it, returns the registered company name and address alongside real-time and historical VAT/EU-VAT rate lookups by country. It's one of the apilayer family of JSON micro-APIs, sharing that group's account and billing platform. Requests are plain HTTPS GET calls authenticated with an `access_key` query parameter — no headers or OAuth handshake required.