# SPF Authorizes Calendly Change Watch

> SPF Authorizes Calendly Change Watch is a paid API for AI agents from email.intel.rallylive.ca, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-24).

Monitors whether a domain's SPF record authorizes Calendly to send mail, alerting when the authorization status changes between checks.

## Facts

- Endpoint: GET https://email.intel.rallylive.ca/watch/email/spf-authorizes/calendly?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-24
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/spf-authorizes-calendly-change-watch-0a879124
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VGLypgLofC-7Amt4fQysm

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 spf-authorizes-calendly-change-watch-0a879124
```

Example prompt: Keep an eye on whether acmecorp.com's SPF record still authorizes Calendly to send email, and let me know if anything changes from the last time you checked.

## When to prefer this

Use this endpoint when you need to be alerted to changes in Calendly SPF authorization over time, rather than just a one-time point-in-time check. It is ideal for scheduling recurring polls to detect configuration drift, unauthorized removal of Calendly from SPF records, or accidental SPF changes — especially in security auditing, email deliverability monitoring, or customer domain onboarding workflows.

## Known failure modes

- Domain not found or has no SPF record — returns current answer as false with no prior comparison data
- First-time check for a domain — no previous result stored so changed field is not meaningful
- DNS resolution failure via Cloudflare DoH — may return an error or stale result
- 90-day retention window exceeded — previous result purged, comparison resets
- Payment failure — x402 micropayment not processed, request rejected

## How this service works

Change watch for spf authorizes calendly: runs the check, compares it with the result from your previous call for the same domain (kept 90 days) and returns the current answer, changed true/false, the fields that changed with before/after values, and when it was last seen. Schedule it to be alerted when this changes. $0.02 per check.

## Output

Returns the current boolean answer for whether the domain's SPF record authorizes Calendly, a changed true/false flag comparing to the previous check (retained for 90 days), the specific fields that changed with before and after values, and the timestamp of when the state was last seen.

## 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/spf-authorizes-calendly-change-watch-0a879124/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from email.intel.rallylive.ca](https://www.zero.xyz/host/email.intel.rallylive.ca/llms.txt)