LedgerProof Settlement Army

Endpoints and prices

Payment evidence

402 payload captured at 2026-08-21 13:39:01 UTC. Check evidence JSON · Measurement methodology.

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x519671b571aE670813B369642A31fE8765827328",
      "amount": "50000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 120
    }
  ],
  "resource": {
    "url": "https://ledgerproofhq.io/api/lain/confidence",
    "mimeType": "application/json",
    "description": "LAIN confidence: independently verifiable evidence about a subject, settled per call in USDC on Base. Proof-gated: payment is captured only after the evidence is assembled and anchored."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {
            "subject": "Acme Corp",
            "settlement": "x402",
            "current_confidence": 0.5,
            "required_confidence": 0.99
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json"
        },
        "output": {
          "type": "json",
          "example": {
            "gap": 0.49,
            "outcome": "resolved",
            "receipt": {
              "verify_url": "https://verify.ledgerproofhq.io/?seq=12345",
              "content_hash": "<sha256>"
            },
            "subject": "Acme Corp",
            "evidence": [
              {
                "source": "sanctions",
                "finding": "no match",
                "checked_at": "2026-08-21T00:00:00Z"
              }
            ]
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input",
          "output"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method",
              "bodyType",
              "body"
            ],
            "properties": {
              "body": {
                "type": "object",
                "required": [
                  "subject"
                ],
                "properties": {
                  "subject": {
                    "type": "string",
                    "description": "entity, product or firm to gather evidence about"
                  },
                  "settlement": {
                    "enum": [
                      "x402"
                    ],
                    "type": "string"
                  },
                  "current_confidence": {
                    "type": "number",
                    "maximum": 1,
                    "minimum": 0
                  },
                  "required_confidence": {
                    "type": "number",
                    "maximum": 1,
                    "minimum": 0
                  }
                }
              },
              "type": {
                "const": "http"
              },
              "method": {
                "enum": [
                  "POST"
                ],
                "type": "string"
              },
              "bodyType": {
                "enum": [
                  "json"
                ]
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type",
              "example"
            ],
            "properties": {
              "type": {
                "const": "json"
              },
              "example": {
                "type": "object"
              }
            },
            "additionalProperties": false
          }
        }
      }
    }
  },
  "x402Version": 2
}