Fetch a reviewed public page and return SHA-256 hashes of both the raw HTML and
Fetch a reviewed public page and return SHA-256 hashes of both the raw HTML and the visible text, with byte and character counts. Two hashes because they answer different questions: the HTML hash moves when anything at all changes, the text hash moves only when the content a reader would notice does.
Answeringour last check, 2026-10-02
1 of 1checks answered this week
3332 msmedian answer time
$0.004listed price per call
$0.004price it asked us
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://api.zfinia.com/x402/v1/page-fingerprint
| Category | Everything else |
|---|---|
| Provider host | api.zfinia.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-02 | valid payment request | 402 | $0.004 | 3332 ms |
Example input (from the provider)
{
"body": {
"url": "https://docs.python.org/3/"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"url": {
"description": "HTTPS URL on a reviewed public origin. Permitted origins: https://docs.python.org, https://developer.mozilla.org, https://en.wikipedia.org, https://www.cisa.gov, https://www.sec.gov, https://home.treasury.gov, https://books.toscrape.com. robots.txt is honoured and redirects are refused.",
"maxLength": 2048,
"type": "string"
}
},
"required": [
"url"
],
"type": "object"
},
"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": {
"additionalProperties": false,
"properties": {
"attribution": {
"description": "Licence and creator for the retrieved content. Reusing it is subject to these terms.",
"properties": {
"creator": {
"type": "string"
},
"licence": {
"type": "string"
},
"licence_url": {
"type": "string"
},
"modifications": {
"type": "string"
},
"source": {
"type": "string"
},
"title": {
"type": "string"
}
},
"required": [
"title",
"source",
"licence",
"licence_url",
"creator",
"modifications"
],
"type": "object"
},
"html_bytes": {
"type": "integer"
},
"html_sha256": {
"type": "string"
},
"limits": {
"description": "The bounds this service applies, declared so a caller can tell a short page from a truncated one.",
"type": "object"
},
"observed_at": {
"type": "string"
},
"request_id": {
"description": "Delivery request identifier; also returned in x-foundry-request-id.",
"type": "string"
},
"service_id": {
"description": "Canonical service identifier.",
"type": "string"
},
"service_version": {
"description": "Version of the invoked service.",
"type": "string"
},
"source_url": {
"type": "string"
},
"text_characters": {
"type": "integer"
},
"text_sha256": {
"type": "string"
},
"title": {
"type": "string"
},
"warnings": {
"description": "Named limits that were reached, so truncation is never silent.",
"items": {
"type": "string"
},
"type": "array"
}
},
"required": [
"request_id",
"service_id",
"service_version",
"source_url",
"observed_at",
"warnings",
"limits",
"attribution",
"html_sha256",
"text_sha256",
"html_bytes",
"text_characters",
"title"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}