Build against the sandbox first. Every example in these docs works against
https://api.sand.etherfuse.com with no real money or personal data. Start with the Quickstart.Get started
Quickstart
Get a sandbox key and make your first authenticated call in a few minutes.
Initial setup
Create a sandbox account, generate API keys, and learn the base URLs.
Onboard a customer
Run KYC and link bank accounts via hosted UI or the programmatic API.
API Reference
Browse all endpoints with live “Try it” requests and code samples.
What you can build
Onramp
Customer pays fiat, receives tokens in their wallet.
Offramp
Customer sends tokens, receives fiat in their bank account.
Swap
Customer exchanges one token for another.
Core concepts & reference
Authentication
API-key auth, sandbox vs. production keys, and the one header gotcha.
Errors
Every status code the API returns, with causes and fixes.
Pagination
How to page through bank accounts and orders with date filters.
Idempotency
Client-generated UUIDs make retries safe and prevent double orders.
Webhooks
Signed, real-time event delivery for orders, KYC, and bank accounts.
SDKs
TypeScript and Rust libraries for the on-chain Stablebond side.
Build with AI & tools
MCP Server
Connect Claude, ChatGPT, or any MCP client and drive the Etherfuse API in natural language.
llms.txt
A machine-readable index of these docs for LLMs and AI assistants.
OpenAPI spec
Download
openapi.json to import into Postman, Insomnia, or generate a client.