# QuoteProof: contract

Created by: AgentToolbox (first-party).
Version: 0.1.1. Beta.

[Tool guide](/tools/quote-proof) · [Success checks](/tools/quote-proof/checks) · [Synthetic examples](/tools/quote-proof/examples) · [Reviews](https://agi.agenttoolbox2026.workers.dev/products/quote-proof/reviews) · [Private feedback](/feedback?tool=quote-proof)

Check quotes against supported documentation, with source evidence.

Scope: Literal quotation fidelity · supported documentation hosts · not truth verification

Cost: from $0.01 USDC per published success; buyer-chosen amount, USDC on Base.
Success: At least one decisive quotation result with schema-validated evidence; unknown results remain explicit. Textual fidelity only, never claim truth.
Failure policy: Invalid input, failed criterion or unavailable decisive evidence never settles. Uncertain settlement requires reconciliation; never issue a replacement authorization.


[Canonical contract JSON](https://agi.agenttoolbox2026.workers.dev/v1/products/quote-proof) · [Buyer guide](/buy)

## Input schema

```json
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "urls": {
      "minItems": 1,
      "maxItems": 5,
      "type": "array",
      "items": {
        "type": "string",
        "maxLength": 512
      }
    },
    "quotes": {
      "minItems": 1,
      "maxItems": 10,
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "source_index": {
            "type": "integer",
            "minimum": 0,
            "maximum": 4
          },
          "quote": {
            "type": "string",
            "minLength": 1,
            "maxLength": 512
          }
        },
        "required": [
          "source_index",
          "quote"
        ],
        "additionalProperties": false
      }
    }
  },
  "required": [
    "urls",
    "quotes"
  ],
  "additionalProperties": false
}
```

## Output schema

```json
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "source_content": {
      "type": "string",
      "const": "untrusted_data"
    },
    "scope": {
      "type": "string",
      "const": "textual_quotation_not_truth"
    },
    "normalization": {
      "type": "string",
      "const": "Case-sensitive; collapse Unicode whitespace runs to one ASCII space and trim; no case, punctuation, Unicode composition, or semantic folding. Offsets are UTF-16 code units in the extracted text before whitespace normalization."
    },
    "sources": {
      "minItems": 1,
      "maxItems": 5,
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "source_index": {
            "type": "integer",
            "minimum": 0,
            "maximum": 4
          },
          "url": {
            "type": "string",
            "maxLength": 512,
            "format": "uri"
          },
          "final_url": {
            "type": "string",
            "maxLength": 512,
            "format": "uri"
          },
          "fetched_at": {
            "type": "string",
            "format": "date-time",
            "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z))$"
          },
          "http_status": {
            "anyOf": [
              {
                "type": "integer",
                "minimum": 100,
                "maximum": 599
              },
              {
                "type": "null"
              }
            ]
          },
          "content_type": {
            "anyOf": [
              {
                "type": "string",
                "maxLength": 80
              },
              {
                "type": "null"
              }
            ]
          },
          "source_bytes": {
            "anyOf": [
              {
                "type": "integer",
                "minimum": 0,
                "maximum": 100000
              },
              {
                "type": "null"
              }
            ]
          },
          "content_sha256": {
            "anyOf": [
              {
                "type": "string",
                "pattern": "^[a-f0-9]{64}$"
              },
              {
                "type": "null"
              }
            ]
          },
          "extraction_sha256": {
            "anyOf": [
              {
                "type": "string",
                "pattern": "^[a-f0-9]{64}$"
              },
              {
                "type": "null"
              }
            ]
          },
          "extraction": {
            "type": "string",
            "enum": [
              "complete_plain_text",
              "static_html",
              "unavailable"
            ]
          },
          "extracted_chars": {
            "anyOf": [
              {
                "type": "integer",
                "minimum": 0,
                "maximum": 200000
              },
              {
                "type": "null"
              }
            ]
          },
          "reason": {
            "anyOf": [
              {
                "type": "string",
                "enum": [
                  "complete_text",
                  "single_occurrence",
                  "repeated_occurrence",
                  "html_absence_unverifiable",
                  "source_too_large",
                  "empty_source",
                  "robots_unavailable",
                  "source_disallows_access",
                  "source_disallows_excerpts",
                  "unsupported_redirect",
                  "redirect_limit",
                  "source_unavailable",
                  "unsupported_content_type",
                  "unsupported_encoding",
                  "extraction_uncertain",
                  "html_runtime_unavailable",
                  "deadline_exceeded"
                ]
              },
              {
                "type": "null"
              }
            ]
          }
        },
        "required": [
          "source_index",
          "url",
          "final_url",
          "fetched_at",
          "http_status",
          "content_type",
          "source_bytes",
          "content_sha256",
          "extraction_sha256",
          "extraction",
          "extracted_chars",
          "reason"
        ],
        "additionalProperties": false
      }
    },
    "results": {
      "minItems": 1,
      "maxItems": 10,
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "quote_index": {
            "type": "integer",
            "minimum": 0,
            "maximum": 9
          },
          "source_index": {
            "type": "integer",
            "minimum": 0,
            "maximum": 4
          },
          "status": {
            "type": "string",
            "enum": [
              "exact_match",
              "whitespace_normalized_match",
              "absent",
              "ambiguous",
              "unknown"
            ]
          },
          "reason": {
            "type": "string",
            "enum": [
              "complete_text",
              "single_occurrence",
              "repeated_occurrence",
              "html_absence_unverifiable",
              "source_too_large",
              "empty_source",
              "robots_unavailable",
              "source_disallows_access",
              "source_disallows_excerpts",
              "unsupported_redirect",
              "redirect_limit",
              "source_unavailable",
              "unsupported_content_type",
              "unsupported_encoding",
              "extraction_uncertain",
              "html_runtime_unavailable",
              "deadline_exceeded"
            ]
          },
          "occurrences": {
            "type": "string",
            "enum": [
              "0",
              "1",
              "2_or_more",
              "unknown"
            ]
          },
          "evidence": {
            "maxItems": 2,
            "type": "array",
            "items": {
              "type": "object",
              "properties": {
                "start_char": {
                  "type": "integer",
                  "minimum": 0,
                  "maximum": 9007199254740991
                },
                "end_char": {
                  "type": "integer",
                  "exclusiveMinimum": 0,
                  "maximum": 9007199254740991
                },
                "anchor_fragment": {
                  "anyOf": [
                    {
                      "type": "string",
                      "maxLength": 361
                    },
                    {
                      "type": "null"
                    }
                  ]
                },
                "context": {
                  "anyOf": [
                    {
                      "type": "object",
                      "properties": {
                        "text": {
                          "type": "string",
                          "maxLength": 180
                        },
                        "start_char": {
                          "type": "integer",
                          "minimum": 0,
                          "maximum": 9007199254740991
                        },
                        "end_char": {
                          "type": "integer",
                          "minimum": 0,
                          "maximum": 9007199254740991
                        }
                      },
                      "required": [
                        "text",
                        "start_char",
                        "end_char"
                      ],
                      "additionalProperties": false
                    },
                    {
                      "type": "null"
                    }
                  ]
                }
              },
              "required": [
                "start_char",
                "end_char",
                "anchor_fragment",
                "context"
              ],
              "additionalProperties": false
            }
          }
        },
        "required": [
          "quote_index",
          "source_index",
          "status",
          "reason",
          "occurrences",
          "evidence"
        ],
        "additionalProperties": false
      }
    },
    "summary": {
      "type": "object",
      "properties": {
        "decisive": {
          "type": "integer",
          "minimum": 0,
          "maximum": 10
        },
        "unknown": {
          "type": "integer",
          "minimum": 0,
          "maximum": 10
        }
      },
      "required": [
        "decisive",
        "unknown"
      ],
      "additionalProperties": false
    }
  },
  "required": [
    "source_content",
    "scope",
    "normalization",
    "sources",
    "results",
    "summary"
  ],
  "additionalProperties": false
}
```

## Limits

```json
{
  "urls": 5,
  "quotes": 10,
  "source_bytes": 100000,
  "robots_bytes": 16384,
  "redirects": 2,
  "deadline_ms": 12000,
  "context_words_per_source": 200,
  "output_bytes": 14000,
  "supported_hosts": [
    "developers.cloudflare.com",
    "docs.payai.network",
    "docs.x402.org",
    "docs.python.org",
    "nodejs.org",
    "developer.mozilla.org",
    "docs.github.com",
    "www.typescriptlang.org"
  ],
  "preview": "Disabled: a verdict is the paid result."
}
```