AgentPay — x402 Payment Infrastructure for AI Agents

AgentPay is the payment infrastructure layer for autonomous AI agents, IoT devices, and machine-to-machine commerce. It implements the x402 Agent Grant System — EIP-712 signed spend policies that let agents pay each other without sharing private keys.

What It Does

• Agent Grants — short-lived, budget-capped, scope-restricted spend authorizations (IAM for agents)
• Event-driven settlement — Base L2 payment confirmation in 2–6 seconds, automatic refunds on failure
• Reputation scoring — optional Sybil-resistant trust layer via The Graph subgraph
• Open spec — fully documented, conformance-tested, implement without AgentPay

Quick Start (60 seconds, no wallet)

git clone https://github.com/shawnhvac/x402.git
cd x402/examples/minimal-node-python

# Terminal 1 — receiving agent
cd python-receiving-agent && pip install -r requirements.txt && python app.py

# Terminal 2 — paying agent
cd node-paying-agent && npm install && npm start

See a full payment cycle — grant → verify → settle → receipt — in your terminal.

On-Chain (Base Sepolia)

Flip two env vars and run the same example with real USDC on Base Sepolia: BASE_SEPOLIA.md

How It Works

Every x402 payment is an HTTP request with a signed grant header:

POST /api/tool HTTP/1.1
X-402-Payment: <base64-encoded EIP-712 grant + EIP-3009 authorization>

The receiving agent verifies the grant offline (no RPC in the happy path), settles on-chain via EIP-3009 transferWithAuthorization, and returns a receipt in the response header.

Spec Suite

Six live documents covering every layer of the stack:

Links

• Website: x402-agent-pay.com
• GitHub: github.com/shawnhvac/x402
• Implementations: COMMUNITY.md
• Network: Base L2 (USDC)