Chain API Documentation

Build modern financial products with Chain's unified API. Move money, issue cards, and manage wallets — all backed by stablecoin infrastructure.

Quick Start

Make your first API call in under a minute.

cURL

curl https://api.chain.com/v1/wallets \
  -H "Authorization: Bearer sk_live_..." \
  -H "Content-Type: application/json" \
  -d '{"currency": "USDC", "label": "Treasury"}'

Core APIs

Payments

Fund accounts and send payouts globally with fiat-to-stablecoin conversion.

POST /v1/fundingPOST /v1/payoutsPOST /v1/payees

Cards

Issue and manage virtual and physical debit cards powered by stablecoin balances.

GET /v1/cardsPOST /v1/cards

Wallets

GET /v1/walletsPOST /v1/wallets

Ledger

Double-entry accounting ledger for tracking all financial movements.

GET /v1/ledger

Platform Tools

Authentication

API keys, Bearer tokens, and rate limits.

Webhooks

Real-time event notifications with signature verification.

SDKs

Official client libraries for Node.js and Python.

Errors

Comprehensive error codes and handling guide.

Base URLs

Productionhttps://api.chain.com/v1

Sandboxhttps://sandbox.chain.com/v1