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/screen/sanctions/:name",
      "description": "Debarment and exclusion screening, not just sanctions: 291,000+ parties on 11 authorities in one call. SAM.gov federal exclusions, HHS OIG healthcare exclusions, World Bank debarment, Federal Reserve enforcement, OFAC SDN and Consolidated, EU, UK, UN, Trade.gov CSL, FBI Wanted. Provable negative: NO_MATCH only when the complete candidate set on all 11 lists was examined, otherwise INCOMPLETE_SCREEN. sha256 receipt. KYB, vendor onboarding, AML, KYC.",
      "maxAmountRequired": "50000",
      "maxTimeoutSeconds": 300
    }
  ],
  "x402Version": 1,
  "free_alternative": {
    "how": "You do not have to pay to try this. GET https://api.osf-master-server.com/x402/free/screen/sanctions/{name} with no payment, no signup, no API key and no wallet, and it returns 200 with a real screening result.",
    "limit": "5 screens per UTC day, no signup and no API key",
    "price": "$0.00",
    "full_catalog": "https://api.osf-master-server.com/x402/discovery/resources",
    "free_http_url": "https://api.osf-master-server.com/x402/free/screen/sanctions/{name}",
    "paid_route_adds": "unmetered volume, the full match list and a retainable sha256 audit receipt",
    "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": {
          "name": ":name"
        },
        "queryParams": {
          "format": "json"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "query": "Vladimir Putin",
          "result": "POTENTIAL_MATCH",
          "matches": [
            {
              "list": "EU_SANCTIONS",
              "match_basis": "primary_name",
              "matched_name": "PUTIN Vladimir Vladimirovich",
              "provenance_url": "https://www.sanctionsmap.eu/"
            }
          ],
          "service": "OSF Sanctions Screening",
          "match_count": 1,
          "audit_receipt": {
            "screening_id": "uuid",
            "result_sha256": "..."
          },
          "coverage_note": "OFAC SDN and Consolidated, EU, UK, UN, Trade.gov CSL, FBI Wanted, World Bank debarment, HHS OIG, SAM.gov, Federal Reserve. Full note in the response.",
          "compliance_note": "A name match is a SCREENING SIGNAL, not a determination. Full note in the response.",
          "screening_evidence": {
            "totals": {
              "records_in_scope": 291758,
              "lists_screened_ok": 11,
              "candidates_examined": 12
            },
            "clearance_statement": "On 2026-01-01T00:00:00Z UTC OSF screened this name against 291,758 records on 11 of 11 lists.",
            "negative_result_confidence": "complete_negative"
          }
        }
      }
    },
    "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": [
                "result",
                "match_count",
                "matches",
                "audit_receipt"
              ],
              "properties": {
                "result": {
                  "enum": [
                    "POTENTIAL_MATCH",
                    "NO_MATCH",
                    "INCOMPLETE_SCREEN",
                    "INVALID_QUERY"
                  ],
                  "type": "string"
                },
                "matches": {
                  "type": "array"
                },
                "match_count": {
                  "type": "integer"
                },
                "audit_receipt": {
                  "type": "object"
                },
                "screen_complete": {
                  "type": "boolean"
                },
                "screening_evidence": {
                  "type": "object"
                }
              }
            }
          }
        }
      }
    },
    "routeTemplate": "/x402/screen/sanctions/:name"
  }
}

Provenance

Seen in the source catalog

2026-08-25 06:16Z

Last indexed by Roundhouse

2026-09-24 06:00Z

Last enriched (probe, favicon, geo)

2026-09-22 11:45Z

x402 version

2

Max timeout

300s

Liveness probe

HTTP 0