Detect meaningful changes in normalized static page metadata and JSON-LD with a
Detect meaningful changes in normalized static page metadata and JSON-LD with a deterministic semantic hash. Transport noise and malformed JSON-LD counts are excluded; callers can fetch full details with web.page-structured only when the state changes. Base mainnet USDC
Answeringour last check, 2026-10-10
1 of 1checks answered this week
925 msmedian answer time
$0.002listed price per call
$0.002price 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://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/page/structured-changed
| Category | Code and developer |
|---|---|
| Provider host | http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 2 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-10 | valid payment request | 402 | $0.002 | 925 ms |
Example input (from the provider)
{
"body": {
"previous_hash": "sha256:0000000000000000000000000000000000000000000000000000000000000000",
"url": "https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/fixtures/page"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"previous_hash": {
"description": "Earlier result hash used to detect a material change.",
"pattern": "^sha256:[a-fA-F0-9]{64}$",
"type": "string"
},
"url": {
"description": "Public HTTP(S) URL to inspect, resolve, or compare.",
"maxLength": 2048,
"minLength": 1,
"pattern": "^https?://",
"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": {
"capability": {
"const": "web.page-structured-changed",
"description": "Public capability value used to scope this lookup."
},
"data": {
"additionalProperties": false,
"description": "Public data value used to scope this lookup.",
"properties": {
"canonical_url": {
"description": "Earlier result hash used to detect a material change.",
"type": [
"string",
"null"
]
},
"changed": {
"description": "Public changed value used to scope this lookup.",
"type": [
"boolean",
"null"
]
},
"changed_fields": {
"description": "Public changed fields value used to scope this lookup.",
"items": {
"type": "string"
},
"type": "array"
},
"entity_count": {
"description": "Public entity count value used to scope this lookup.",
"maximum": 100,
"minimum": 0,
"type": "integer"
},
"new_hash": {
"description": "Public new hash value used to scope this lookup.",
"type": "string"
},
"previous_hash": {
"description": "Earlier result hash used to detect a material change.",
"type": [
"string",
"null"
]
},
"rendered_javascript": {
"const": false,
"description": "Public rendered javascript value used to scope this lookup."
},
"source_url": {
"description": "Public source url value used to scope this lookup.",
"type": "string"
},
"title": {
"description": "Earlier result hash used to detect a material change.",
"type": [
"string",
"null"
]
},
"truncated": {
"description": "Public truncated value used to scope this lookup.",
"type": "boolean"
},
"type_counts": {
"description": "Public type counts value used to scope this lookup.",
"items": {
"additionalProperties": false,
"properties": {
"count": {
"description": "Public count value used to scope this lookup.",
"minimum": 1,
"type": "integer"
},
"type": {
"description": "DNS record type to query.",
"type": "string"
}
},
"required": [
"type",
"count"
],
"type": "object"
},
"type": "array"
}
},
"required": [
"changed",
"previous_hash",
"new_hash",
"changed_fields",
"source_url",
"title",
"canonical_url",
"entity_count",
"type_counts",
"truncated",
"rendered_javascript"
],
"type": "object"
},
"meta": {
"additionalProperties": false,
"description": "Public meta value used to scope this lookup.",
"properties": {
"cache": {
"description": "Public cache value used to scope this lookup.",
"enum": [
"hit",
"miss",
"bypass"
]
},
"checked_at": {
"description": "Public checked at value used to scope this lookup.",
"type": "string"
},
"duration_ms": {
"description": "Public duration ms value used