# certificate-history-watch

> certificate-history-watch is a paid API for AI agents from intel.rallylive.ca, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Monitors certificate transparency log history for a domain and detects changes between polling intervals, returning a diff of what changed.

## Facts

- Endpoint: GET https://intel.rallylive.ca/watch/monitor/cert-history
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/certificate-history-watch-2911a00c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0CvmWVh1dUGM-4Dwe6igy

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 certificate-history-watch-2911a00c
```

Example prompt: Keep an eye on certificate transparency log history for example.com — check it on a schedule and let me know any time new certificates are issued or anything in the history changes.

## When to prefer this

Choose this endpoint when you need scheduled, diff-aware monitoring of certificate transparency logs for a specific domain — it handles state management automatically (storing the previous result for 90 days) and returns a structured field-level diff, saving you from storing and comparing snapshots yourself. Prefer it over a raw CT log query when you want change detection built in rather than having to implement your own comparison logic.

## Known failure modes

- Domain not specified or invalid — no result returned
- No prior snapshot exists (first call) — changed flag may be false or undefined, no diff available
- Network or CT log fetch failure — may return error or stale data
- Result retention window expired (>90 days since last call) — treated as first call with no baseline

## How this service works

Change watch for certificate history: runs the check and compares it with the result from your previous call for the same domain (kept 90 days), returning the current answer, changed true/false, exactly which fields changed with before/after values, and when it was last seen. Call it on a schedule to be told when certificate issuance history from certificate-transparency logs changes. $0.01 per check.

## Output

Returns the current certificate history result, a boolean 'changed' flag indicating whether anything differs from the previous call, a field-level diff listing exactly which fields changed with before and after values, and a timestamp of when the data was last seen. Results are retained for 90 days per domain.

## 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",
     "properties": {}
    }
   },
   "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/certificate-history-watch-2911a00c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from intel.rallylive.ca](https://www.zero.xyz/host/intel.rallylive.ca/llms.txt)