Open Source Filings

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/identity/entity/:query",
      "description": "Entity and counterparty verification by identifier or name. Resolves US healthcare providers (CMS NPI), legal entities (GLEIF LEI), US banks (FDIC), SEC filers (EDGAR CIK or ticker), and US tax exempt orgs (IRS EIN). Returns legal name, status, jurisdiction, identifiers, and a provenance URL to the official source. For KYC, KYB, due diligence, and onboarding agent workflows.",
      "maxAmountRequired": "50000",
      "maxTimeoutSeconds": 300
    }
  ],
  "x402Version": 1,
  "free_alternative": {
    "how": "There is no free twin of this exact check, but you can probe OSF for nothing before you decide. Point any MCP client at https://api.osf-master-server.com/mcp and call the free tool screen_entity_free. It screens the name against 11 sanctions and debarment authorities but does not resolve it against the business and healthcare registries the paid lookup uses.",
    "limit": "no daily cap",
    "price": "$0.00",
    "full_catalog": "https://api.osf-master-server.com/x402/discovery/resources",
    "free_mcp_tool": "screen_entity_free",
    "paid_route_adds": "exactly the part the free tool does not answer, above",
    "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": "0x72f62dE8b70d6CFa8Cc2dF6f21F243f289F3396c",
    "amount": "50000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "pathParams": {
          "query": ":query"
        },
        "queryParams": {
          "format": "json"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "query": "254900C6J3WN4F1AU607",
          "result": "FOUND",
          "matches": [
            {
              "name": "Defiance KSM TipRanks Analyst ETF",
              "registry": "GLEIF",
              "identifier": "254900C6J3WN4F1AU607",
              "entity_type": "legal_entity",
              "match_basis": "identifier",
              "jurisdiction": "US-DE",
              "provenance_url": "https://search.gleif.org/#/record/254900C6J3WN4F1AU607",
              "identifier_type": "LEI"
            }
          ],
          "service": "OSF Identity - Entity Lookup",
          "match_count": 1,
          "audit_receipt": {
            "lookup_id": "uuid",
            "result_sha256": "..."
          },
          "coverage_note": "Resolved against US CMS NPI (healthcare providers), GLEIF LEI (global legal entities), FDIC (US insured banks), SEC EDGAR (US filers), and the IRS EO BMF (US tax exempt organizations) only. This is not a complete global registry of all businesses or individuals; absence here does not mean an entity does not exist.",
          "compliance_note": "A registry match is an identity SIGNAL, not a full due-diligence determination. Confirm against the linked official source and follow your institution's onboarding/KYB process before acting."
        }
      }
    },
    "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": [
                "service",
                "query",
                "result",
                "match_count",
                "matches",
                "compliance_note",
                "audit_receipt"
              ],
              "properties": {
                "query": {
                  "type": "string"
                },
                "result": {
                  "type": "string",
                  "description": "FOUND, NOT_FOUND, LOOKUP_UNAVAILABLE, or INVALID_INPUT"
                },
                "matches": {
                  "type": "array"
                },
                "service": {
                  "type": "string"
                },
                "match_count": {
                  "type": "integer"
                },
                "audit_receipt": {
                  "type": "object"
                },
                "coverage_note": {
                  "type": "string"
                },
                "compliance_note": {
                  "type": "string"
                }
              }
            }
          }
        }
      }
    },
    "routeTemplate": "/x402/identity/entity/:query"
  }
}

Provenance

Seen in the source catalog

2026-08-26 06:17Z

Last indexed by Roundhouse

2026-09-25 06:10Z

Last enriched (probe, favicon, geo)

2026-09-14 04:45Z

x402 version

2

Max timeout

300s

Liveness probe

HTTP 0