api.osf-master-server.com

Live 402 challenge

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

{
  "note": "x402 v2 clients: the canonical quote is the PAYMENT-REQUIRED response header (base64 JSON envelope). This body is a v1 compatibility rendering of the same quote.",
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x72f62dE8b70d6CFa8Cc2dF6f21F243f289F3396c",
      "scheme": "exact",
      "network": "base",
      "mimeType": "application/json",
      "resource": "https://api.osf-master-server.com/x402/buy/standard/:record_id",
      "description": "One verified record per call from over 7 million provenance stamped US government and scientific records across 80 sources and 16 categories: sanctions and debarment lists, court opinions, CVEs and exploited vulnerabilities, federal contract awards, lobbying disclosures, tax exempt organizations, clinical and drug data, economic series, research papers, and more. Full JSON plus a provenance URL to the authoritative primary source.",
      "maxAmountRequired": "50000",
      "maxTimeoutSeconds": 300
    }
  ],
  "x402Version": 1,
  "free_alternative": {
    "how": "Browse before you buy, for nothing. Point any MCP client at https://api.osf-master-server.com/mcp and call the free tool get_catalog, which returns record ids, live per record prices and the provenance URL for every source with no payment and no API key. The 13 free search_* tools on that same endpoint also return record ids you can buy here. The cheapest paid door is $0.001 at https://api.osf-master-server.com/x402/sample/{record_id}.",
    "limit": "no daily cap",
    "price": "$0.00",
    "full_catalog": "https://api.osf-master-server.com/x402/discovery/resources",
    "free_mcp_tool": "get_catalog",
    "paid_route_adds": "the full record body and its provenance block",
    "free_mcp_endpoint": "https://api.osf-master-server.com/mcp",
    "not_an_x402_field": "free_alternative is an OSF addition to the 402 body, not part of the x402 specification, which defines no field for advertising a free alternative. x402 SDKs silently drop unknown keys, so read this from the raw JSON response rather than expecting your client library to surface it."
  }
}

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": "0x051A0Ba2235210c47ca1b8dF68A137eF0d8cAf85",
    "amount": "50000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "pathParams": {
          "record_id": ":record_id"
        },
        "queryParams": {
          "format": "json"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "data": {
            "data_type": "...",
            "record_key": "SRC:ID"
          },
          "source": "CISA_KEV",
          "status": "success",
          "data_type": "CISA Known Exploited Vulnerability",
          "record_id": 12345,
          "provenance_url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog"
        }
      }
    },
    "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",
                "HEAD",
                "DELETE"
              ],
              "type": "string"
            },
            "pathParams": {
              "type": "object"
            },
            "queryParams": {
              "type": "object",
              "required": [
                "format"
              ],
              "properties": {
                "format": {
                  "type": "string",
                  "description": "Response format (json)."
                }
              }
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object",
              "required": [
                "status",
                "record_id",
                "data",
                "provenance_url"
              ],
              "properties": {
                "data": {
                  "type": "object"
                },
                "source": {
                  "type": "string"
                },
                "status": {
                  "type": "string"
                },
                "data_type": {
                  "type": "string"
                },
                "record_id": {
                  "type": "integer"
                },
                "provenance_url": {
                  "type": "string"
                }
              }
            }
          }
        }
      }
    },
    "routeTemplate": "/buy/standard/:record_id"
  }
}

Provenance

Seen in the source catalog

2026-07-19 02:11Z

Last indexed by Roundhouse

2026-07-23 06:10Z

Last enriched (probe, favicon, geo)

2026-09-23 15:45Z

x402 version

2

Max timeout

300s

Liveness probe

HTTP 0