deliberately brokenx402

Version as a string

An x402 challenge whose x402Version is the string "2" where the spec requires the number 2.

Your client should Refuse it rather than coerce the version and carry on.

Protocol: x402
Network: Base Sepolia
Price: 0.0001 USDC
Scheme: exact
Facilitator: x402.org
Behavior: Version as a string

x402Version is the string "2" rather than the number 2. A client validating the literal refuses it; one that coerces sails past a real type error.

Customize this test

Your endpointVersion as a string

/api/x402?quirk=version-as-string

Try it

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

Returns 402 whose x402Version is quoted. The v2 spec types the field as a required number that must be 2, so this is a type violation, not a spelling.

Response it will return (HTTP 402)

PAYMENT-REQUIRED: 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

{
  "x402Version": "2",
  "error": "PAYMENT-SIGNATURE header is required",
  "resource": {
    "url": "https://test402.com/api/x402?quirk=version-as-string",
    "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=version-as-string"
}