# Public Data Monitor – Baseline & Change Report

> 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.

## Facts

- Endpoint: POST https://9dmb38pvlp8dr1d3rtfjpe934o.ingress.h4i-dedicated.eu-sw-2.digitalfrontier.so/api/seller/v3/public-data-monitor
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/public-data-monitor-baseline-change-report-d2f838f2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3ByrEnikpj8pGrVDbiGpx

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability public-data-monitor-baseline-change-report-d2f838f2 -d '<json body>'
```

Example prompt: Create a baseline snapshot of https://www.sec.gov/rules/proposed.shtml right now, and then check back in an hour to give me a cryptographically hashed change report showing exactly what was added or removed.

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/public-data-monitor-baseline-change-report-d2f838f2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 9dmb38pvlp8dr1d3rtfjpe934o.ingress.h4i-dedicated.eu-sw-2.digitalfrontier.so](https://www.zero.xyz/host/9dmb38pvlp8dr1d3rtfjpe934o.ingress.h4i-dedicated.eu-sw-2.digitalfrontier.so/llms.txt)