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Annalist API Contract Monitor
x402
Annalist API Contract Monitor is a paid API for AI agents from api.annalist.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-21).
Returns the current contract record for a watched public API: version, operation count, deprecated operations, security schemes, and all breaking changes in the last 90 days, read daily from the provider's published OpenAPI spec.
Price / call$0.005
Success—
StatusUnknown
How this service works
One watched public API's contract record: current version, operation count and keys, deprecated operations, security schemes, and every dated change in the last 90 days with what broke. From the provider's published OpenAPI description, read daily. Without name=, lists the APIs we watch. Signed.
Output
A signed JSON record containing the API's current OpenAPI version, total operation count, list of deprecated operations, active security schemes, and a dated changelog of all changes (including breaking changes) observed in the past 90 days. If no name parameter is provided, returns the list of all APIs currently monitored by Annalist.
Example use cases
Breaking change audit before upgrade
“Has the OpenAI API had any breaking changes in the last 90 days? I want to see the full change history before we upgrade our integration.”
Deprecated endpoint discovery
“Check the Annalist record for the Twilio API and tell me which operations have been deprecated — I need to know before our next release.”
List all monitored public APIs
“What public APIs does Annalist currently watch? Give me the full list so I can see if the ones we depend on are covered.”
Technical details
Endpoint
GEThttps://api.annalist.dev/v1/apis/api?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need authoritative, daily-refreshed contract data for a well-known public API — including deprecation status, breaking change history, and security scheme details — sourced directly from the provider's published OpenAPI spec. Prefer this over manually fetching and diffing OpenAPI specs when you need a signed, structured changelog rather than raw spec files.
Side effects
- API name not found in the watched list — returns empty or error indicating the API is not monitored
- API provider's OpenAPI spec temporarily unavailable — stale or missing data for recent days
- Malformed name parameter — may return a 400 or empty result
- Payment failure via x402 — call not executed if USDC payment cannot be processed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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