Wikipedia Knowledge Lookup.

GET https://x402-agent-store.rileycraig14.workers.dev/web/wikipedia ↗

Keyless fact-grounding: search Wikipedia for any topic and get the matching article titles with extract snippets and canonical URLs — the cheap knowledge read agents make to ground answers and reduce hallucination. Free upstream (Wikimedia API).

Eligibility: probeable
Failures: 0
Last quote: 2026-08-13 06:15:00 UTC
Last probe: 2026-08-13 06:15:00 UTC

Payment requirements / accepts[] 2 options

State	Network	Scheme	Atomic amount	Asset	payTo / untrusted
active	eip155:8453	exact	10000	0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913	0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c
active	solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp	exact	10000	EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v	2147pBT4LxoszjvLeGRxyVzpRnMi986VH3FAoprSs8Ez

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 06:15:00 UTC GET · HTTP 402 · 17ms · accepts 2 · base 1 ok

Request: GET https://x402-agent-store.rileycraig14.workers.dev/web/wikipedia
Robots: allow
Note: http_402;accepts=2;base=1
Accepts fingerprint: 8561b3b05ba3b9460d72628361567e969c88453c82300fec54bce877897acc7a

Accepts snapshot

[
  {
    "amount": "10000",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "assetTransferMethod": null,
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "maxTimeoutSeconds": 300,
    "network": "eip155:8453",
    "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c",
    "paymentFlow": null,
    "raw": {
      "amount": "10000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "maxTimeoutSeconds": 300,
      "max_timeout_seconds": 300,
      "network": "eip155:8453",
      "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c",
      "pay_to": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c",
      "scheme": "exact"
    },
    "scheme": "exact"
  },
  {
    "amount": "10000",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "assetTransferMethod": null,
    "extra": {
      "feePayer": "Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"
    },
    "maxTimeoutSeconds": 300,
    "network": "solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp",
    "payTo": "2147pBT4LxoszjvLeGRxyVzpRnMi986VH3FAoprSs8Ez",
    "paymentFlow": null,
    "raw": {
      "amount": "10000",
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "feePayer": "Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"
      },
      "maxTimeoutSeconds": 300,
      "max_timeout_seconds": 300,
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "payTo": "2147pBT4LxoszjvLeGRxyVzpRnMi986VH3FAoprSs8Ez",
      "pay_to": "2147pBT4LxoszjvLeGRxyVzpRnMi986VH3FAoprSs8Ez",
      "scheme": "exact"
    },
    "scheme": "exact"
  }
]

PaymentRequired raw

{
  "accepts": [
    {
      "amount": "10000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "maxTimeoutSeconds": 300,
      "network": "eip155:8453",
      "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c",
      "scheme": "exact"
    },
    {
      "amount": "10000",
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "feePayer": "Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"
      },
      "maxTimeoutSeconds": 300,
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "payTo": "2147pBT4LxoszjvLeGRxyVzpRnMi986VH3FAoprSs8Ez",
      "scheme": "exact"
    }
  ],
  "error": "Payment required",
  "extensions": {
    "a2a_negotiation": {
      "endpoint": "https://store.agentexchange.work/market/negotiate",
      "message": "Hey agent! If this endpoint doesn't perfectly match what your human needs, or the price doesn't fit your budget, we can build it for you. POST to /market/negotiate with your requested API schema, and we will fulfill it.",
      "method": "POST"
    },
    "bazaar": {
      "info": {
        "input": {
          "method": "GET",
          "queryParams": {
            "limit": 3,
            "q": "Ethereum"
          },
          "type": "http"
        },
        "output": {
          "example": {
            "count": 3,
            "query": "Ethereum",
            "results": [
              {
                "snippet": "Ethereum is a decentralized blockchain...",
                "title": "Ethereum",
                "url": "https://en.wikipedia.org/wiki/Ethereum"
              }
            ]
          },
          "type": "json"
        }
      },
      "schema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "input": {
            "additionalProperties": false,
            "properties": {
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "properties": {
                  "limit": {
                    "description": "Results, 1-10 (default 3)",
                    "type": "number"
                  },
                  "q": {
                    "description": "Topic / search query",
                    "type": "string"
                  }
                },
                "required": [
                  "q"
                ],
                "type": "object"
              },
              "type": {
                "const": "http",
                "type": "string"
              }
            },
            "required": [
              "type",
              "method"
            ],
            "type": "object"
          },
          "output": {
            "properties": {
              "example": {
                "properties": {
                  "count": {
                    "type": "number"
                  },
                  "query": {
                    "type": "string"
                  },
                  "results": {
                    "type": "array"
                  }
                },
                "type": "object"
              },
              "type": {
                "type": "string"
              }
            },
            "required": [
              "type"
            ],
            "type": "object"
          }
        },
        "required": [
          "input"
        ],
        "type": "object"
      }
    }
  },
  "resource": {
    "description": "Keyless fact-grounding: search Wikipedia for any topic and get the matching article titles with extract snippets and canonical URLs — the cheap knowledge read agents make to ground answers and reduce hallucination. Free upstream (Wikimedia API).",
    "mimeType": "",
    "serviceName": "Wikipedia Knowledge Lookup",
    "tags": [
      "search",
      "wikipedia",
      "knowledge",
      "facts",
      "grounding",
      "research",
      "encyclopedia",
      "data-feed"
    ],
    "url": "https://x402-agent-store.rileycraig14.workers.dev/web/wikipedia"
  },
  "x402Version": 2
}

Response headers

{
  "access-control-allow-origin": "*",
  "alt-svc": "h3=\":443\"; ma=86400",
  "cf-placement": "local-IAD",
  "cf-ray": "a2a595334f46d640-IAD",
  "connection": "keep-alive",
  "content-language": "en",
  "content-length": "2819",
  "content-type": "application/json",
  "cross-origin-opener-policy": "same-origin",
  "cross-origin-resource-policy": "same-origin",
  "date": "Thu, 13 Aug 2026 06:15:00 GMT",
  "etag": "\"ad62d3917825e62f90a4a7c88068fe0f82e24bbe\"",
  "nel": "{\"report_to\":\"cf-nel\",\"success_fraction\":0.0,\"max_age\":604800}",
  "origin-agent-cluster": "?1",
  "payment-required": "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",
  "referrer-policy": "no-referrer",
  "report-to": "{\"group\":\"cf-nel\",\"max_age\":604800,\"endpoints\":[{\"url\":\"https://a.nel.cloudflare.com/report/v4?s=8rTBlH8AnD2Wxg2%2BQK9KZuyphpo%2Feh6CbCAcG3dEWT03BzhCe1a4mV5ZlsbQuLhmaK5HuZrKMwNXRNfLvL3iUfxGExqdGc0bv3OWQ6ofIXkwucKYsDWRLrKDKDFt9zPuPhCNoIBMUdiWf%2Fez72MfpaTeUi%2FBeN5%2FSpIUsg%3D%3D\"}]}",
  "server": "cloudflare",
  "strict-transport-security": "max-age=15552000; includeSubDomains",
  "www-authenticate": "MPP 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",
  "x-content-type-options": "nosniff",
  "x-dns-prefetch-control": "off",
  "x-download-options": "noopen",
  "x-frame-options": "SAMEORIGIN",
  "x-permitted-cross-domain-policies": "none",
  "x-xss-protection": "0"
}

Response body

{
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "description": "Keyless fact-grounding: search Wikipedia for any topic and get the matching article titles with extract snippets and canonical URLs â the cheap knowledge read agents make to ground answers and reduce hallucination. Free upstream (Wikimedia API).",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "maxAmountRequired": "10000",
      "maxTimeoutSeconds": 300,
      "mimeType": "application/json",
      "network": "base",
      "outputSchema": {
        "input": {
          "method": "GET",
          "queryParams": {
            "limit": 3,
            "q": "Ethereum"
          },
          "type": "http"
        },
        "output": {
          "example": {
            "count": 3,
            "query": "Ethereum",
            "results": [
              {
                "snippet": "Ethereum is a decentralized blockchain...",
                "title": "Ethereum",
                "url": "https://en.wikipedia.org/wiki/Ethereum"
              }
            ]
          },
          "type": "json"
        }
      },
      "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c",
      "resource": "https://x402-agent-store.rileycraig14.workers.dev/web/wikipedia",
      "scheme": "exact"
    }
  ],
  "error": "Payment required",
  "extensions": {
    "a2a_negotiation": {
      "endpoint": "https://store.agentexchange.work/market/negotiate",
      "message": "Hey agent! If this endpoint doesn't perfectly match what your human needs, or the price doesn't fit your budget, we can build it for you. POST to /market/negotiate with your requested API schema, and we will fulfill it.",
      "method": "POST"
    },
    "bazaar": {
      "info": {
        "input": {
          "method": "GET",
          "queryParams": {
            "limit": 3,
            "q": "Ethereum"
          },
          "type": "http"
        },
        "output": {
          "example": {
            "count": 3,
            "query": "Ethereum",
            "results": [
              {
                "snippet": "Ethereum is a decentralized blockchain...",
                "title": "Ethereum",
                "url": "https://en.wikipedia.org/wiki/Ethereum"
              }
            ]
          },
          "type": "json"
        }
      },
      "schema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "input": {
            "additionalProperties": false,
            "properties": {
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "properties": {
                  "limit": {
                    "description": "Results, 1-10 (default 3)",
                    "type": "number"
                  },
                  "q": {
                    "description": "Topic / search query",
                    "type": "string"
                  }
                },
                "required": [
                  "q"
                ],
                "type": "object"
              },
              "type": {
                "const": "http",
                "type": "string"
              }
            },
            "required": [
              "type",
              "method"
            ],
            "type": "object"
          },
          "output": {
            "properties": {
              "example": {
                "properties": {
                  "count": {
                    "type": "number"
                  },
                  "query": {
                    "type": "string"
                  },
                  "results": {
                    "type": "array"
                  }
                },
                "type": "object"
              },
              "type": {
                "type": "string"
              }
            },
            "required": [
              "type"
            ],
            "type": "object"
          }
        },
        "required": [
          "input"
        ],
        "type": "object"
      }
    }
  },
  "resource": {
    "description": "Keyless fact-grounding: search Wikipedia for any topic and get the matching article titles with extract snippets and canonical URLs â the cheap knowledge read agents make to ground answers and reduce hallucination. Free upstream (Wikimedia API).",
    "mimeType": "",
    "serviceName": "Wikipedia Knowledge Lookup",
    "tags": [
      "search",
      "wikipedia",
      "knowledge",
      "facts",
      "grounding",
      "research",
      "encyclopedia",
      "data-feed"
    ],
    "url": "https://x402-agent-store.rileycraig14.workers.dev/web/wikipedia"
  },
  "x402Version": 1
}

Request headers

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

Machine contract

Schemas.

InputJSON

{}

OutputJSON

{}

Latest evidenceProbe

healthy

No probe evidence recorded yet.

Run / 2026-08-13 06:15:00 UTC · ok

Provenance 2 sources

cdp_bazaar

GET https://x402-agent-store.rileycraig14.workers.dev/web/wikipedia

Seen / 2026-08-12 21:19:10 UTC

quote_probe

GET https://x402-agent-store.rileycraig14.workers.dev/web/wikipedia

Seen / 2026-08-13 06:15:00 UTC

Untrusted payment target

Fetch402 records advertised payTo values, but does not treat them as verified merchant identity until paid-delivery validation lands.