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Public Data Monitor – Baseline & Change Report
x402
Public Data Monitor – Baseline & Change Report is a paid API for AI agents from 9dmb38pvlp8dr1d3rtfjpe934o.ingress.h4i-dedicated.eu-sw-2.digitalfrontier.so, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).
Creates a cryptographically hashed baseline snapshot of a public URL or returns a sourced, timestamped, hash-verified change report since the last baseline.
Price / call$0.05
Success—
StatusUnknown
How this service works
Create a public-data baseline or receive a sourced, timestamped and cryptographically hashed change report.
Output
Returns either (a) a baseline record containing a timestamped SHA-256 hash of the current state of the public URL, plus a credential token for future change checks, or (b) a change report containing sourced before/after evidence of what changed, a timestamp of when the change was detected, and cryptographic hashes verifying the integrity of both the old and new states.
Example use cases
Regulatory page change audit
“Set up a tamper-evident baseline on https://www.fda.gov/safety/recalls-market-withdrawals-safety-alerts and then run a change report against it — I need a timestamped, SHA-256-hashed diff I can use as evidence if anything was quietly updated.”
Public pricing page monitoring
“Baseline our competitor's public pricing page at https://competitor.com/pricing right now, and give me a sourced change report the next time I call so I can see exactly what text was added, removed, or changed, with cryptographic proof.”
Government dataset version tracking
“Create a baseline of the public CSV at https://data.cityofnewyork.us/api/views/abc123/rows.csv and then generate a change report showing any row-level additions or removals since that baseline, with hashes so I can verify the evidence.”
Technical details
Endpoint
POSThttps://9dmb38pvlp8dr1d3rtfjpe934o.ingress.h4i-dedicated.eu-sw-2.digitalfrontier.so/api/seller/v3/public-data-monitorWhen to prefer
Choose this endpoint when you need cryptographically verifiable, auditable evidence of what a public webpage or dataset contained at a specific point in time, or exactly what changed between two points — particularly for compliance, legal, regulatory, or investigative use cases where a simple screenshot is insufficient. Prefer this over generic web scraping when tamper-evident hashing and sourced change provenance are required.
Side effects
- URL is not publicly accessible — returns error indicating the resource could not be fetched
- Invalid or expired baseline credential — change report cannot be generated without a valid prior baseline
- Non-HTTPS or private URL provided — endpoint only supports public HTTPS sources
- Rate limit or payment failure — $0.05 USDC per call; insufficient payment returns 402
- Target page returns non-200 status — baseline or diff cannot be captured
- Content type not supported — binary or unsupported MIME types may not be processable
Tags
x402
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