x402fix by AgentGate – x402 Endpoint Doctor (Lite)

{
  "type": "json",
  "example": {
    "url": "https://api.example.com/v1/data",
    "tier": "lite",
    "x402": {
      "v1": false,
      "v2": true,
      "bazaar": true,
      "networks": [
        "Base"
      ],
      "price_usd": 0.01
    },
    "fixes": [
      {
        "n": 1,
        "id": "v2_accept_0",
        "fix": "Set extra: { name: \"USD Coin\", version: \"2\" }. Signatures over the wrong domain fail verification, so every payment is rejected.",
        "problem": "v2 accepts[0] (Base): EIP-712 domain \"USDC\" v2 does not match USDC on Base (\"USD Coin\" v2)",
        "severity": "error"
      },
      {
        "n": 2,
        "id": "head_402",
        "fix": "Answer HEAD like GET without a body (402 + PAYMENT-REQUIRED header). 402index and other directory health checks probe with HEAD and mark the endpoint down otherwise.",
        "problem": "HEAD answers 405, not 402",
        "severity": "warn"
      },
      {
        "n": 3,
        "id": "cors_expose",
        "fix": "Send Access-Control-Allow-Origin: * and Access-Control-Expose-Headers: PAYMENT-REQUIRED, PAYMENT-RESPONSE, X-PAYMENT-RESPONSE on 402 and 200 responses.",
        "problem": "Browsers cannot read the PAYMENT-REQUIRED header (not in Access-Control-Expose-Headers)",
        "severity": "warn"
      }
    ],
    "grade": "C",
    "score": 70,
    "method": "GET",
    "status": "fix_needed",
    "summary": "C (70/100): x402 v2, Base. 1 error(s), 3 warning(s); first fix: v2 accepts[0] (Base): EIP-712 domain \"USDC\" v2 does not match USDC on Base (\"USD Coin\" v2)."
  }
}