deliberately brokenx402

No version field

The challenge omits x402Version entirely.

Your client should Refuse it rather than assume a version.

Protocol: x402
Network: Base Sepolia
Price: 0.0001 USDC
Scheme: exact
Facilitator: x402.org
Behavior: No version field

The challenge omits x402Version. A client that assumes a version is guessing.

Customize this test

Your endpointNo version field

/api/x402?quirk=missing-version

Try it

curl -i "https://test402.com/api/x402?quirk=missing-version"

Returns 402 with no x402Version field in the challenge.

Response it will return (HTTP 402)

PAYMENT-REQUIRED: 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

{
  "error": "PAYMENT-SIGNATURE header is required",
  "resource": {
    "url": "https://test402.com/api/x402?quirk=missing-version",
    "description": "test402 challenge",
    "mimeType": "application/json"
  },
  "accepts": [
    {
      "scheme": "exact",
      "network": "eip155:84532",
      "amount": "100",
      "asset": "0x036CbD53842c5426634e7929541eC2318f3dCF7e",
      "payTo": "0x0000000000000000000000000000000000000402",
      "maxTimeoutSeconds": 300,
      "extra": {
        "name": "USDC",
        "version": "2",
        "assetTransferMethod": "eip3009"
      }
    }
  ],
  "extensions": {
    "https://test402.com/extensions/facilitator": {
      "id": "x402org",
      "url": "https://x402.org/facilitator"
    }
  },
  "note": "test402 scenario. quirk=missing-version"
}