PRESENCE tier (deterministic, no LLM)

PRESENCE tier (deterministic, no LLM): confirms the claimed value appears on the live page — it does NOT confirm the value is the right answer to the question. Positive verdict is "present", never "pass"; check_type web_field_presence_v1. For full verification use /verify. First 100 checks per client are free: resend with header X-Use-Free-Allowance: yes and no payment to use them.

Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.

Endpoint

POST https://scrapecheck.fly.dev/verify-presence

Our checks, last 30 days

Example input (from the provider)

{
  "body": {
    "asked": "get the current price and stock status of A Light in the Attic",
    "claim": {
      "in_stock": true,
      "price": "\u00a351.77"
    },
    "url": "https://books.toscrape.com/catalogue/a-light-in-the-attic_1000/index.html"
  },
  "bodyType": "json",
  "method": "POST",
  "type": "http"
}

Promised output schema (from the provider)

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "input": {
      "additionalProperties": false,
      "properties": {
        "body": {
          "properties": {
            "asked": {
              "description": "the original request, plain text",
              "type": "string"
            },
            "claim": {
              "description": "the claimed field values to look for on the page",
              "type": "object"
            },
            "url": {
              "description": "source page (public http/https)",
              "type": "string"
            }
          },
          "required": [
            "url",
            "claim",
            "asked"
          ]
        },
        "bodyType": {
          "enum": [
            "json",
            "form-data",
            "text"
          ],
          "type": "string"
        },
        "method": {
          "enum": [
            "POST"
          ],
          "type": "string"
        },
        "type": {
          "const": "http",
          "type": "string"
        }
      },
      "required": [
        "type",
        "method",
        "bodyType",
        "body"
      ],
      "type": "object"
    },
    "output": {
      "properties": {
        "example": {
          "properties": {
            "check_type": {
              "description": "The check contract used, e.g. web_field_presence_v1.",
              "type": "string"
            },
            "confidence": {
              "description": "The engine's confidence in the verdict, 0 to 1.",
              "type": "number"
            },
            "engine": {
              "description": "Engine name and version digest that produced the verdict.",
              "type": "string"
            },
            "evidence": {
              "description": "What the re-fetch observed.",
              "properties": {
                "lens_votes": {
                  "description": "Boolean votes is_real, is_current from the judging lenses.",
                  "properties": {
                    "is_current": {
                      "type": "boolean"
                    },
                    "is_real": {
                      "type": "boolean"
                    }
                  },
                  "type": "object"
                },
                "refetch_excerpt": {
                  "description": "Excerpt of the re-fetched page content the verdict was judged against.",
                  "type": "string"
                },
                "refetched_at": {
                  "description": "UTC timestamp of the engine's own fetch of the page.",
                  "type": "string"
                }
              },
              "type": "object"
            },
            "key_id": {
              "description": "Identifier of the signing key; resolve against GET /pubkey.",
              "type": "string"
            },
            "reasons": {
              "description": "The stated reasons for the verdict.",
              "items": {
                "type": "string"
              },
              "type": "array"
            },
            "signature": {
              "description": "ed25519 signature over canonical sorted-key JSON of every field except signature.",
              "type": "string"
            },
            "source_hash": {
              "description": "sha256 of the normalized page text the verdict judged; null when no anchor text was obtained.",
              "type": [
                "string",
                "null"
              ]
            },
            "verdict": {
              "description": "One of present, fail, unverifiable.",
              "enum": [
                "present",
                "fail",
                "unverifiable"
              ],
              "type": "string"
            },
            "verdict_id": {
              "description": "Unique identifier for this verdict; its issuance is confirmable at GET /verdicts/{verdict_id}.",
              "type": "string"
            },
            "verifier_url": {
              "description": "The issuing service's URL; display only, never a trust root.",
              "type": "string"
            }
          },
          "required": [
            "verdict_id",
            "verdict",
            "confidence",
            "reasons",
            "evidence",
            "check_type",
            "engine",
            "key_id",
            "verifier_url",
            "source_hash",
            "signature"
          ],
          "type": "object"
        },
        "type": {
          "type": "string"
        }
      },
      "required": [
        "type"
      ],
      "type": "object"
    }
  },
  "required": [
    "input"
  ],
  "type": "object"
}

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