deliberately brokenx402

Amount as a number

A challenge whose amount is a bare JSON number, not an atomic-units string.

Your client should Refuse it, or read the amount as a big-integer string.

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

The amount is a JSON number, not the atomic-units string the spec requires. A client that does Number(amount) loses precision above 2^53.

Customize this test

Your endpointAmount as a number

/api/x402?quirk=amount-as-number

Try it

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

Returns 402 whose amount is a bare JSON number rather than a quoted string.

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=amount-as-number",
    "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=amount-as-number"
}