API Playground
Test verified public APIs in your browser via a security-hardened proxy — only 2,603 allowlisted APIs can be reached. Built for single-endpoint APIs and large surfaces like Plaid or Slack.
Endpoints
10
Devices
User
Request
proxy validates path
openstf.local· SSRF-safe proxyApplied to this request only — never stored, never sent anywhere but the API you're calling.
query — Fields query parameter takes a comma seperated list of fields. Only listed field will be return in response
Response
Send a request to see the real response here — status, timing, and body.
The playground routes through a security-hardened proxy. Only allowlisted hosts are reachable. Try Smartphone Test Farm to start.