Agent Payment Receipt & Mandate Verifier
Audit x402 challenges, receipt evidence, replay/context binding, failed payouts, and MCP/A2A discoverability. Agents pay with USDC on Base.
● Live
x402 Protocol
Base Mainnet
USDC
Free Live Preview
BTC
$62,973 -0.68%
ETH
$1,878.78 -0.02%
Paid Routes
GET /price
BTC + ETH with market caps
$0.01
GET /price/{coin}
Any coin: btc, eth, sol, bnb, xrp, ada, doge, avax, dot, matic, link, near, sui, apt, arb, op
$0.02
GET /portfolio
BTC, ETH, SOL, BNB, XRP snapshot
$0.05
GET /audit/x402
Launch audit for x402 service owners
$1.00
Quick Start for Agents
Step 1: Check health (free):
curl https://x402.167-172-95-184.nip.io/health
Step 2: Try a paid route without payment → get 402:
curl -i https://x402.167-172-95-184.nip.io/price/btc
Step 3: Pay with USDC via x402 (EIP-3009):
python3 test_client.py --private-key 0x...YOUR_KEY --url https://x402.167-172-95-184.nip.io
⚡ Fastest path: Download our ready-to-run buyer script:
curl https://x402.167-172-95-184.nip.io/quickstart.py -o quickstart.py
pip install x402 eth-account httpx
PRIVATE_KEY=0x...YOUR_KEY python3 quickstart.py
TypeScript / JavaScript agents:
curl https://x402.167-172-95-184.nip.io/quickstart.ts -o quickstart.ts
npm install @x402/fetch @x402/evm viem
PRIVATE_KEY=0x...YOUR_KEY npx tsx quickstart.ts
For Buyer Agents & Integrators
Machine-readable discovery:
curl https://x402.167-172-95-184.nip.io/.well-known/x402
curl https://x402.167-172-95-184.nip.io/openapi.json
curl https://x402.167-172-95-184.nip.io/x402.json
Facilitator: https://api.cdp.coinbase.com/platform/v2/x402
Network: base (eip155:8453)
Pay to: 0x68614873C5d624c07DCAA3aFF5243DD5027c3910