x402 Protocol

Payments
for Agents.

A native HTTP 402 payment facilitator by Intent Studios. Verify and settle ERC-3009 payments on-chain with a single API call. Built for autonomous agents and agentic commerce.

View API Documentation

Infrastructure for the Machine Economy

Verify Before You Settle

Validate payment signatures, check on-chain balances, and simulate transactions before committing. Supports EOA, EIP-1271, and EIP-6492 smart wallet signatures.

1

Gasless Transfers

ERC-3009 transferWithAuthorization. Users sign off-chain, you settle on-chain.

2

Multi-Chain EVM

Base, Ethereum, Polygon, Arbitrum, Optimism, and every EIP-155 chain. V1 and V2 x402 protocol support with automatic scheme registration per chain.

3
Live

API Endpoints

Standard x402 facilitator interface. All endpoints accept and return JSON.

Method Path Description
POST /verify Verify a payment payload against requirements
POST /settle Settle an accepted payment on-chain
GET /verify Get supported verification schema
GET /settle Get supported settlement schema
GET /supported List supported payment kinds and signers
GET /health Health check

Ready to integrate?

Add HTTP 402 native payments to your agent workflows with a few lines of code.

Read the Docs