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Changelog State API – Monitor Changes
x402
Changelog State API – Monitor Changes is a paid API for AI agents from changelog-state-api.replit.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Retrieves a filtered list of detected changes (new releases, version bumps, title edits, date shifts, breaking signals) for a specific monitored changelog identified by its slug.
Price / call$0.01
Success—
StatusUnknown
How this service works
Changelog State API — built on Replit. Update this description to reflect the app.
Output
Returns a JSON object with the monitor's name, slug, a count of matching changes, and an array of change records each containing: unique ID, change type (new_release, version_changed, date_changed, title_changed, breaking_signal), detected timestamp, previous and new values, a summary, evidence text, and associated release metadata (URL, title, version, publishedAt).
Example use cases
Track breaking API changes for a dependency
“Pull up all breaking_signal changes detected for the 'stripe-api' changelog monitor since 2026-01-01, give me up to 10 results.”
Check for new software releases overnight
“Did the 'node-js' changelog monitor pick up any new_release changes in the last 24 hours? Show me up to 5.”
Audit version bumps for a monitored package
“Get me all version_changed events for the 'openai-sdk' changelog monitor since 2025-12-01, limit to 50, so I can review what versions shipped.”
Technical details
Endpoint
GEThttps://changelog-state-api.replit.app/api/monitors/%7Bslug%7D/changesWhen to prefer
Use this endpoint when you need to programmatically query historical or recent change events for a specific changelog monitor by slug, especially when you want to filter by change type or time window. Prefer this over manual changelog scraping when you need structured, evidence-backed change records with before/after values and timestamps.
Side effects
- Unknown slug returns 404 with no matching monitor data
- Invalid change type enum value returns 400 validation error
- Malformed 'since' timestamp format returns 400 parse error
- No changes matching filters returns empty changes array with changeCount 0
- Payment not processed results in 402 Payment Required response
- Rate limiting or server errors return 5xx responses
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| type | string | Restrict to a single change type. |
| limit | integer | Maximum number of change rows to return. |
| since | string | Only return changes detected at or after this instant. |
Output
Schema · Response
{
"name": "string",
"slug": "string",
"changes": [
{
"id": 1,
"release": {
"url": "string",
"title": "string",
"version": "string",
"publishedAt": "2026-01-15T09:30:00.000Z"
},
"summary": "string",
"evidence": "string",
"newValue": "string",
"changeType": "new_release",
"detectedAt": "2026-01-15T09:30:00.000Z",
"previousValue": "string"
}
],
"changeCount": 1
}Tags
x402
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