Fingerprint a public page so agents can detect changes
Fingerprint a public page so agents can detect changes: final url, etag, lastModified, sha256 contentHash of normalized visible text, raw byteLength, and fetchedAt. POST JSON {"url":"https://example.com"}. Public http(s) only; private hosts blocked. $0.04 USDC on Base (eip155:8453). No API key.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
237 msmedian answer time
$0.04listed price per call
$0.04price 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://scrooge-x402-tool-mill.vercel.app/v1/change-fingerprint
| Category | Everything else |
|---|---|
| Provider host | scrooge-x402-tool-mill.vercel.app |
| 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 |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.04 | 237 ms |
Example input (from the provider)
{
"body": {
"url": "https://example.com"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"url": {
"description": "Public http(s) URL to fetch (SSRF-safe; private/link-local blocked)",
"format": "uri",
"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": {
"byteLength": {
"description": "Raw upstream response size in bytes",
"minimum": 0,
"type": "integer"
},
"contentHash": {
"description": "sha256 hex of normalized visible text",
"pattern": "^[a-f0-9]{64}$",
"type": "string"
},
"etag": {
"description": "Upstream ETag header, or null",
"type": [
"string",
"null"
]
},
"fetchedAt": {
"description": "ISO-8601 time the page was fetched",
"format": "date-time",
"type": "string"
},
"lastModified": {
"description": "Upstream Last-Modified header, or null",
"type": [
"string",
"null"
]
},
"url": {
"description": "Final URL after redirects",
"format": "uri",
"type": "string"
}
},
"required": [
"url",
"etag",
"lastModified",
"contentHash",
"byteLength",
"fetchedAt"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}