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Web Page & JSON Field Change Monitor (SHA-256 Hash Watch)
x402
Web Page & JSON Field Change Monitor (SHA-256 Hash Watch) is a paid API for AI agents from pyfile-agent.taile3ff35.ts.net, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).
Computes the SHA-256 hash of a URL's page or JSON body and compares it against a provided baseline hash to detect changes, with optional JSON path extraction for watching specific fields.
Price / call$0.003
Success—
StatusUnknown
How this service works
SHA-256 of a page or JSON body + change detection vs a baseline hash. Stateless monitoring. Add &json_path=a.b.0 to extract and watch a single JSON field (price, counter). ?url=https://example.com&baseline=<sha256>&json_path=bitcoin.usd
Output
Returns the current SHA-256 hash of the fetched URL content (or extracted JSON field value), a boolean or status indicating whether it matches the provided baseline hash, and optionally the extracted value at the specified JSON path. The response is stateless — no history is stored server-side.
Example use cases
Crypto price change alert
“Watch https://api.coindesk.com/v1/bpi/currentprice.json and tell me if the bitcoin.usd value has changed from my baseline hash 9f86d081884c7d659a2feaa0c55ad015. Extract just that bitcoin.usd field for me.”
Product page tamper detection
“Has https://mystore.com/product/widget changed at all since yesterday? My baseline SHA-256 from last night is e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855 — let me know if anything on the page is different.”
API counter monitoring
“I'm tracking a JSON endpoint at https://api.myapp.com/stats and want to know if the users.total counter has changed from my baseline hash d04b98f48e8f8bcc15c6ae5ac050801cd6dcfd428fb5f9e65c4e16e7807340fa — check it and pull out the users.total field.”
Technical details
Endpoint
GEThttps://pyfile-agent.taile3ff35.ts.net/data/watchWhen to prefer
Choose this endpoint when you need lightweight, stateless change detection for a specific URL or JSON field without maintaining your own storage or polling infrastructure. It is ideal for agents that already hold a previous hash and want a one-shot comparison. Prefer this over full scraping pipelines when you only care whether content has changed (not what changed), and especially when you need to watch a single deeply nested JSON field like a price or counter via json_path extraction.
Side effects
- Target URL is unreachable or returns a non-200 status — hash cannot be computed
- Invalid or malformed JSON path provided — field extraction fails
- Baseline hash format is incorrect — comparison cannot be performed
- Target URL returns dynamic content (ads, timestamps) causing false-positive change detection
- URL requires authentication — fetch returns login page instead of expected content
- Rate limiting or blocking by the target server during fetch
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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