x402 Checkup

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "error": "Payment required",
  "networks": [
    "eip155:8453",
    "eip155:84532"
  ],
  "rehearse": "Pay on Base Sepolia first with test USDC from https://faucet.circle.com.",
  "how_to_pay": "The payment options are base64 JSON in the PAYMENT-REQUIRED response header. Pay $0.005 in USDC with an x402 client (for example @x402/fetch) and you get a diagnosis of the payment your client signed."
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xe6f7508ab572a4dc9c7486ea017b100d83f3c3f8",
    "amount": "5000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "0x036CbD53842c5426634e7929541eC2318f3dCF7e",
    "extra": {
      "name": "USDC",
      "version": "2"
    },
    "payTo": "0xe6f7508ab572a4dc9c7486ea017b100d83f3c3f8",
    "amount": "5000",
    "scheme": "exact",
    "network": "eip155:84532",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "echo": "hello"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "diagnosis": {
            "checks": [
              {
                "id": "amount",
                "status": "pass",
                "message": "authorization.value is exactly the required amount (5000 atomic units)."
              },
              {
                "id": "valid_before",
                "status": "warn",
                "message": "The authorization stays valid for 86400 s. ..."
              }
            ],
            "payment": {
              "from": "0x...",
              "value": "5000",
              "network": "eip155:8453",
              "signature_type": "eoa"
            },
            "request": {
              "body": "{\"echo\":\"hello\"}",
              "path": "/v1/checkup",
              "method": "POST"
            },
            "summary": {
              "fail": 0,
              "info": 2,
              "pass": 9,
              "warn": 1
            }
          },
          "report_url": "https://checkup.example/v1/reports/0x3f1c...",
          "settlement": "Settlement happens after this response is sent. Its result is in the PAYMENT-RESPONSE header and in report_url."
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method"
          ],
          "properties": {
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "queryParams": {
              "type": "object",
              "properties": {
                "echo": {
                  "type": "string",
                  "maxLength": 1024,
                  "description": "any text; it is echoed back so you can check it survived the paid retry"
                }
              }
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object",
              "required": [
                "report_url",
                "diagnosis"
              ],
              "properties": {
                "preview": {
                  "type": "string",
                  "description": "present for testnet payments, whose diagnosis has the status of each check but not the explanations"
                },
                "diagnosis": {
                  "type": "object",
                  "description": "summary counts, checks (id, status pass|warn|fail|info, message), payment fields and the request as received"
                },
                "report_url": {
                  "type": "string",
                  "description": "free URL of the report, including the facilitator's verify and settle results"
                },
                "settlement": {
                  "type": "string"
                }
              }
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog

2026-10-24 17:23Z

Last indexed by Roundhouse

2026-10-26 17:20Z

Last enriched (probe, favicon, geo)

2026-10-24 12:16Z

x402 version

2

Max timeout

300s

Liveness probe

HTTP 402