FETCH402
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Resource / 978

healthy

AI Citation Check.

GET https://mudko.com/api/x402/citation-check ↗

Live AI-citation check: runs fresh probes against major AI assistants and reports whether a domain is cited for its vertical's buying questions — citation rate per provider, list position, and whether the domain's agent-card was discovered. Fresh probes per call (not cached). $0.50 per check. Free companion diagnosis: /api/x402/deep-scan.

Eligibility
probeable
Failures
0
Last quote
2026-08-13 06:00:02 UTC
Last probe
2026-08-13 06:00:02 UTC
Payment requirements / accepts[] 1 options
State Network Scheme Atomic amount Asset payTo / untrusted
active eip155:8453 exact 500000 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 0x53598173ce7c26025bab0520d9e9d0c28fbcf7de

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 06:00:02 UTC GET · HTTP 402 · 45ms · accepts 1 · base 1 ok
Request
GET https://mudko.com/api/x402/citation-check
Robots
allow
Note
http_402;accepts=1;base=1
Accepts fingerprint
eb974d39518392dd50bf0193b4bf59b97d1bc306118e1bccf7d9ca3e560f726f

Accepts snapshot

[
  {
    "amount": "500000",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "assetTransferMethod": null,
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "maxTimeoutSeconds": 120,
    "network": "eip155:8453",
    "payTo": "0x53598173ce7c26025bab0520d9e9d0c28fbcf7de",
    "paymentFlow": null,
    "raw": {
      "amount": "500000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "maxTimeoutSeconds": 120,
      "max_timeout_seconds": 120,
      "network": "eip155:8453",
      "payTo": "0x53598173ce7c26025bab0520d9e9d0c28fbcf7de",
      "pay_to": "0x53598173ce7c26025bab0520d9e9d0c28fbcf7de",
      "scheme": "exact"
    },
    "scheme": "exact"
  }
]

PaymentRequired raw 

{
  "accepts": [
    {
      "amount": "500000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "maxTimeoutSeconds": 120,
      "network": "eip155:8453",
      "payTo": "0x53598173ce7c26025bab0520d9e9d0c28fbcf7de",
      "scheme": "exact"
    }
  ],
  "error": "pass ?domain= (bare domain to check AI citations for).",
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "method": "GET",
          "queryParams": {
            "domain": "example.com (string, required - bare domain to check)",
            "vertical": "healthcare_practice (string, optional - vertical id)"
          },
          "type": "http"
        },
        "output": {
          "example": {
            "agent_card_discovered": false,
            "citation_rate": 0.25,
            "domain": "example.com",
            "paid": true,
            "providers": [
              {
                "avg_position": 3,
                "citations": 1,
                "probes": 2,
                "provider": "openai"
              }
            ]
          },
          "type": "json"
        }
      },
      "schema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "input": {
            "additionalProperties": false,
            "properties": {
              "method": {
                "enum": [
                  "GET",
                  "HEAD",
                  "DELETE"
                ],
                "type": "string"
              },
              "queryParams": {
                "properties": {
                  "domain": {
                    "description": "Bare domain to check citations for (required).",
                    "type": "string"
                  },
                  "vertical": {
                    "description": "Optional vertical id to pick prompt sets (auto-detected otherwise).",
                    "type": "string"
                  }
                },
                "required": [
                  "domain"
                ],
                "type": "object"
              },
              "type": {
                "const": "http",
                "type": "string"
              }
            },
            "required": [
              "type",
              "method"
            ],
            "type": "object"
          },
          "output": {
            "properties": {
              "example": {
                "properties": {
                  "agent_card_discovered": {
                    "type": "boolean"
                  },
                  "citation_rate": {
                    "type": "number"
                  },
                  "domain": {
                    "type": "string"
                  },
                  "providers": {
                    "type": "array"
                  }
                },
                "type": "object"
              },
              "type": {
                "type": "string"
              }
            },
            "required": [
              "type"
            ],
            "type": "object"
          }
        },
        "required": [
          "input"
        ],
        "type": "object"
      }
    }
  },
  "resource": {
    "description": "Live AI-citation check: runs fresh probes against major AI assistants and reports whether a domain is cited for its vertical's buying questions — citation rate per provider, list position, and whether the domain's agent-card was discovered. Fresh probes per call (not cached). $0.50 per check. Free companion diagnosis: /api/x402/deep-scan.",
    "mimeType": "application/json",
    "serviceName": "AI Citation Check",
    "tags": [
      "ai-citations",
      "aeo",
      "geo",
      "brand-monitoring",
      "llm-visibility"
    ],
    "url": "https://mudko.com/api/x402/citation-check"
  },
  "x402Version": 2
}

Response headers

{
  "access-control-allow-headers": "content-type, accept, x-agent-name",
  "access-control-allow-methods": "GET, POST, OPTIONS",
  "access-control-allow-origin": "*",
  "access-control-max-age": "86400",
  "age": "0",
  "cache-control": "public, max-age=0, must-revalidate",
  "content-security-policy": "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval'; style-src 'self' 'unsafe-inline'; img-src 'self' data: https:; font-src 'self' data:; connect-src 'self' https:; frame-src https:; frame-ancestors 'none'; base-uri 'self'; form-action 'self' https:",
  "content-type": "application/json",
  "date": "Thu, 13 Aug 2026 06:00:02 GMT",
  "link": "</.well-known/api-catalog>; rel=\"api-catalog\", </.well-known/agent-card.json>; rel=\"service-desc\"; type=\"application/json\"",
  "payment-required": "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",
  "permissions-policy": "camera=(), microphone=(), geolocation=()",
  "referrer-policy": "strict-origin-when-cross-origin",
  "server": "Vercel",
  "strict-transport-security": "max-age=63072000",
  "transfer-encoding": "chunked",
  "x-content-type-options": "nosniff",
  "x-frame-options": "DENY",
  "x-matched-path": "/api/x402/citation-check",
  "x-vercel-cache": "MISS",
  "x-vercel-id": "iad1::iad1::rxm7w-1786600802575-e7efd9bc5baa"
}

Response body 

{
  "accepts": [
    {
      "amount": "500000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "maxTimeoutSeconds": 120,
      "network": "eip155:8453",
      "payTo": "0x53598173ce7c26025bab0520d9e9d0c28fbcf7de",
      "scheme": "exact"
    }
  ],
  "error": "pass ?domain= (bare domain to check AI citations for).",
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "method": "GET",
          "queryParams": {
            "domain": "example.com (string, required - bare domain to check)",
            "vertical": "healthcare_practice (string, optional - vertical id)"
          },
          "type": "http"
        },
        "output": {
          "example": {
            "agent_card_discovered": false,
            "citation_rate": 0.25,
            "domain": "example.com",
            "paid": true,
            "providers": [
              {
                "avg_position": 3,
                "citations": 1,
                "probes": 2,
                "provider": "openai"
              }
            ]
          },
          "type": "json"
        }
      },
      "schema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "input": {
            "additionalProperties": false,
            "properties": {
              "method": {
                "enum": [
                  "GET",
                  "HEAD",
                  "DELETE"
                ],
                "type": "string"
              },
              "queryParams": {
                "properties": {
                  "domain": {
                    "description": "Bare domain to check citations for (required).",
                    "type": "string"
                  },
                  "vertical": {
                    "description": "Optional vertical id to pick prompt sets (auto-detected otherwise).",
                    "type": "string"
                  }
                },
                "required": [
                  "domain"
                ],
                "type": "object"
              },
              "type": {
                "const": "http",
                "type": "string"
              }
            },
            "required": [
              "type",
              "method"
            ],
            "type": "object"
          },
          "output": {
            "properties": {
              "example": {
                "properties": {
                  "agent_card_discovered": {
                    "type": "boolean"
                  },
                  "citation_rate": {
                    "type": "number"
                  },
                  "domain": {
                    "type": "string"
                  },
                  "providers": {
                    "type": "array"
                  }
                },
                "type": "object"
              },
              "type": {
                "type": "string"
              }
            },
            "required": [
              "type"
            ],
            "type": "object"
          }
        },
        "required": [
          "input"
        ],
        "type": "object"
      }
    }
  },
  "resource": {
    "description": "Live AI-citation check: runs fresh probes against major AI assistants and reports whether a domain is cited for its vertical's buying questions — citation rate per provider, list position, and whether the domain's agent-card was discovered. Fresh probes per call (not cached). $0.50 per check. Free companion diagnosis: /api/x402/deep-scan.",
    "mimeType": "application/json",
    "serviceName": "AI Citation Check",
    "tags": [
      "ai-citations",
      "aeo",
      "geo",
      "brand-monitoring",
      "llm-visibility"
    ],
    "url": "https://mudko.com/api/x402/citation-check"
  },
  "x402Version": 2
}

Request headers

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

Machine contract

Schemas.

InputJSON
{}
OutputJSON
{}