# SiteSignal API Changelog Actions

> SiteSignal API Changelog Actions is a paid API for AI agents from trinity-throw-thursday-gravity.trycloudflare.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-16).

Extracts source-linked changelog signals, urgency levels, affected endpoint areas, and action items from a public API documentation URL.

## Facts

- Endpoint: GET https://trinity-throw-thursday-gravity.trycloudflare.com/x402/api-changelog
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitesignal-api-changelog-actions-442a2b32
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SRZmTtRCK1EyKzD5yCN7r

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 sitesignal-api-changelog-actions-442a2b32
```

Example prompt: Can you pull the latest changelog signals and action items from https://stripe.com/docs/changelog — I want to know what's urgent, which endpoints are affected, and what I need to do about it?

## When to prefer this

Use this endpoint when you need structured, actionable intelligence from a public API changelog page — especially when you want urgency classification and per-endpoint impact analysis rather than raw text. Prefer it over general web scraping when the source is API documentation, and over manual monitoring when you need to automate change tracking or triage for developer workflows.

## Known failure modes

- sourceUrl is not publicly accessible or returns a non-200 status
- URL points to a page with no recognizable changelog content, returning empty signals
- changeWindow or endpointFocus filters yield no matching entries
- Rate limiting or Cloudflare bot protection on the target URL blocks extraction
- Malformed or unparseable documentation format causes partial extraction

## How this service works

Extract source-linked API changelog signals, urgency, affected areas, and action items from bounded public documentation.

## Output

Returns structured changelog signals extracted from the provided public documentation URL, including urgency ratings, affected API endpoint areas, source-linked change entries, and concrete action items developers should take in response to each change.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "sourceUrl"
     ],
     "properties": {
      "sourceUrl": {
       "type": "string",
       "format": "uri"
      },
      "changeWindow": {
       "type": "string"
      },
      "endpointFocus": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sitesignal-api-changelog-actions-442a2b32/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from trinity-throw-thursday-gravity.trycloudflare.com](https://www.zero.xyz/host/trinity-throw-thursday-gravity.trycloudflare.com/llms.txt)