Partner API Authentication
Every Partner API request uses your API key as a Bearer token. There is no OAuth or JWT exchange step.
Authorization: Bearer fs_test_your_api_key_here
API keys
Create and rotate keys in Fiatsend Console under Settings → API Keys.
| Environment | Key prefix | Base URL |
|---|---|---|
| Sandbox | fs_test_* | https://sandbox.fiatsend.com/v1 |
| Production | fs_live_* | https://api.fiatsend.com/v1 |
warning
Never expose API keys in client-side code, mobile apps, or public repositories. Call the Partner API from your backend only. Rotate keys immediately if compromised.
Optional: health without auth
GET /health may be called without a token to verify connectivity. All other endpoints require authentication.
FiatsendOne (app) authentication
End users of FiatsendOne authenticate via Privy wallet login and app session cookies. That flow is separate from Partner API keys and is not part of the public integration contract.