HardDeck Media — x402 Agent Commerce API

⚡ Live Interactive x402 Handshake Playground

Test the exact wire protocol. See how autonomous agents are challenged with an HTTP 402 status code and unlock resources after cryptographically signing payment.

Target Domain to Audit

RESPONSE 0ms

⚙️ The Technical Handshake Explained

1. Client Request: GET /api/v1/audit?domain=target.com 2. Server Challenge: 402 Payment Required Header: PAYMENT-REQUIRED: eyJ4NDAyVmVyc2lvbiI6IjEuMCIsInByaWNlIjoiMC4wMDUiLCJjdXJyZW5jeSI6IlVTREMifQ== (Decodes to: { price: "$0.005", currency: "USDC", network: "base", recipient: "0x1111..." }) 3. Agent Payment: Agent wallet executes micropayment on Base L2 4. Retry Request: GET /api/v1/audit + Header: PAYMENT-SIGNATURE: 0x7a8b... 5. Server Response: 200 OK + Header: PAYMENT-RESPONSE: status=settled Body: Forensic DNS, Server Header, SSL & Security Compliance JSON

🔌 Model Context Protocol (MCP) Manifest

Agents using Claude Desktop or Antigravity can connect via standard MCP discovery at /mcp.

mcp_config.json JSON-RPC

{
  "name": "audit_domain",
  "description": "Forensic domain & security stack audit for AI agents",
  "endpoint": "https://harddeck-x402-api.pages.dev/api/v1/audit",
  "payment": {
    "protocol": "x402",
    "price": "0.005",
    "currency": "USDC",
    "network": "base"
  }
}