API reference
Overview
Endpoints, schemas, and live "Try it" examples for the BlendFi API.
The BlendFi API lets you onboard users, run KYC, quote PIX-to-USDT trades, and execute transactions end-to-end. Every endpoint on this reference exposes an interactive Try it panel that runs against the sandbox through a server-side proxy — no production traffic possible.
Where to start
- Users — create users and run KYC submissions.
- Transactions — quote, execute, and observe the full PIX-to-USDT lifecycle.
Conventions
- All endpoints accept and return JSON.
- Mutating endpoints (
POST,PATCH,DELETE) require anIdempotency-Keyheader — see Idempotency. - Errors follow a uniform shape documented in Errors.
- Sandbox base URL and rate limits are documented in Environments and rate limits.
Authentication
Send your sandbox API key as a Bearer token:
Authorization: Bearer sk_sandbox_...The interactive playground stores the key in your browser only; it is never sent to BlendFi servers as plain text from the docs site.