FETCH402
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Resource / 502

healthy

Quartermaster x402 Inspector.

GET https://quartermaster.surewhynot.app/v1/x402/inspect ↗

Inspect and lint any x402 paid endpoint: decodes the 402 payment challenge, names the network and asset, and flags misconfigurations including missing Bazaar discovery metadata.

Eligibility
probeable
Failures
0
Last quote
2026-08-13 01:15:01 UTC
Last probe
2026-08-13 01:15:01 UTC
Payment requirements / accepts[] 2 options
State Network Scheme Atomic amount Asset payTo / untrusted
active eip155:8453 exact 2000 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 0x5253666c40432f009ebd99908b9cd2a7fd1019cb
active solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp exact 2000 EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v FgcKNzsBXSEHGNZNWetPsjXiBZk1WFoU6sF2zVsnzXfa

All advertised payment options are stored. Base (`eip155:8453`) is the operational network for ranking and canaries; non-Base options remain visible for transparency.

Probe evidence 1 recent
healthy 2026-08-13 01:15:01 UTC GET · HTTP 402 · 9ms · accepts 2 · base 1 ok
Request
GET https://quartermaster.surewhynot.app/v1/x402/inspect
Robots
allow
Note
http_402;accepts=2;base=1
Accepts fingerprint
aabc0bfbbc6a582195698b0a31c091f8c6d6b03a28537f49c9d21115b578a929

Accepts snapshot

[
  {
    "amount": "2000",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "assetTransferMethod": null,
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "maxTimeoutSeconds": 300,
    "network": "eip155:8453",
    "payTo": "0x5253666c40432f009ebd99908b9cd2a7fd1019cb",
    "paymentFlow": null,
    "raw": {
      "amount": "2000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "maxTimeoutSeconds": 300,
      "max_timeout_seconds": 300,
      "network": "eip155:8453",
      "payTo": "0x5253666c40432f009ebd99908b9cd2a7fd1019cb",
      "pay_to": "0x5253666c40432f009ebd99908b9cd2a7fd1019cb",
      "scheme": "exact"
    },
    "scheme": "exact"
  },
  {
    "amount": "2000",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "assetTransferMethod": null,
    "extra": {
      "feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM"
    },
    "maxTimeoutSeconds": 300,
    "network": "solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp",
    "payTo": "FgcKNzsBXSEHGNZNWetPsjXiBZk1WFoU6sF2zVsnzXfa",
    "paymentFlow": null,
    "raw": {
      "amount": "2000",
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM"
      },
      "maxTimeoutSeconds": 300,
      "max_timeout_seconds": 300,
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "payTo": "FgcKNzsBXSEHGNZNWetPsjXiBZk1WFoU6sF2zVsnzXfa",
      "pay_to": "FgcKNzsBXSEHGNZNWetPsjXiBZk1WFoU6sF2zVsnzXfa",
      "scheme": "exact"
    },
    "scheme": "exact"
  }
]

PaymentRequired raw 

{
  "accepts": [
    {
      "amount": "2000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "maxTimeoutSeconds": 300,
      "network": "eip155:8453",
      "payTo": "0x5253666c40432f009ebd99908b9cd2a7fd1019cb",
      "scheme": "exact"
    },
    {
      "amount": "2000",
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM"
      },
      "maxTimeoutSeconds": 300,
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "payTo": "FgcKNzsBXSEHGNZNWetPsjXiBZk1WFoU6sF2zVsnzXfa",
      "scheme": "exact"
    }
  ],
  "error": "Payment required",
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "method": "GET",
          "queryParams": {
            "url": "https://api.example.com/paid-endpoint"
          },
          "type": "http"
        },
        "output": {
          "example": {
            "accepts": [
              {
                "asset_name": "USDC (Base mainnet)",
                "network": "eip155:8453",
                "network_name": "Base mainnet",
                "pay_to": "0x...",
                "scheme": "exact"
              }
            ],
            "findings": [
              "No `bazaar` discovery extension declared - settlements will NOT list this endpoint in the Coinbase Bazaar catalog."
            ],
            "has_bazaar_discovery_metadata": false,
            "http_status": 402,
            "is_x402": true,
            "url": "https://api.example.com/paid-endpoint",
            "x402_version": 2
          },
          "type": "json"
        }
      },
      "schema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "input": {
            "additionalProperties": false,
            "properties": {
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "properties": {
                  "url": {
                    "description": "Any x402 paid endpoint to inspect and lint",
                    "format": "uri",
                    "type": "string"
                  }
                },
                "required": [
                  "url"
                ],
                "type": "object"
              },
              "type": {
                "const": "http",
                "type": "string"
              }
            },
            "required": [
              "type",
              "method"
            ],
            "type": "object"
          },
          "output": {
            "properties": {
              "example": {
                "type": "object"
              },
              "type": {
                "type": "string"
              }
            },
            "required": [
              "type"
            ],
            "type": "object"
          }
        },
        "required": [
          "input"
        ],
        "type": "object"
      }
    }
  },
  "resource": {
    "description": "Inspect and lint any x402 paid endpoint: decodes the 402 payment challenge, names the network and asset, and flags misconfigurations including missing Bazaar discovery metadata.",
    "mimeType": "application/json",
    "serviceName": "Quartermaster x402 Inspector",
    "tags": [
      "x402",
      "402",
      "payments",
      "debugging",
      "developer-tools",
      "bazaar",
      "discovery",
      "lint"
    ],
    "url": "https://quartermaster.surewhynot.app/v1/x402/inspect"
  },
  "x402Version": 2
}

Response headers

{
  "access-control-allow-origin": "*",
  "access-control-expose-headers": "PAYMENT-REQUIRED,PAYMENT-RESPONSE,X-PAYMENT-RESPONSE,X-Payment-Notice,Retry-After",
  "alt-svc": "h3=\":443\"; ma=86400",
  "cache-control": "no-store",
  "cf-ray": "a2a3ddc4db2bc9a5-IAD",
  "connection": "keep-alive",
  "content-length": "2",
  "content-type": "application/json",
  "date": "Thu, 13 Aug 2026 01:15:01 GMT",
  "nel": "{\"report_to\":\"cf-nel\",\"success_fraction\":0.0,\"max_age\":604800}",
  "payment-required": "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",
  "permissions-policy": "camera=(), microphone=(), geolocation=()",
  "referrer-policy": "strict-origin-when-cross-origin",
  "report-to": "{\"group\":\"cf-nel\",\"max_age\":604800,\"endpoints\":[{\"url\":\"https://a.nel.cloudflare.com/report/v4?s=o0omdERDfC1blACSet9WTzWMQuUbua2YCUlWZZILhqu4snDhfWRwlq1Qky1gNE2WWC9Jiqr5W6Yy9hgUp9lip%2FpOwYL6mTJN7mkabkd6ghr3SlbcpCb8V3JaDdvV6atMdkNcoIdxRmNLsx8kgjDt\"}]}",
  "server": "cloudflare",
  "speculation-rules": "\"/cdn-cgi/speculation\"",
  "strict-transport-security": "max-age=31536000; includeSubDomains",
  "x-content-type-options": "nosniff"
}

Response body 

{}

Request headers

{
  "accept": "*/*",
  "user-agent": "Fetch402Bot/0.1 (+https://fetch402.com/crawler; contact: crawler@fetch402.com)"
}

Machine contract

Schemas.

InputJSON
{}
OutputJSON
{}