# SPF Authorizes Customer.io – Change Watch

> SPF Authorizes Customer.io – 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 Customer.io to send mail, returning a diff (changed true/false, before/after values) compared to the previous call for the same domain.

## Facts

- Endpoint: GET https://email.intel.rallylive.ca/watch/email/spf-authorizes/customerio?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-customer-io-change-watch-476d0b9b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_RmI73iI0iyeat5axEw0k8

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-customer-io-change-watch-476d0b9b
```

Example prompt: Keep an eye on whether acme.com's SPF record still authorizes Customer.io to send email, and let me know if anything has changed since you last checked.

## When to prefer this

Use this endpoint when you need to detect changes to a domain's Customer.io SPF authorization over time, rather than just a one-time lookup. It is purpose-built for scheduled polling workflows where you want to be alerted if Customer.io is added or removed from an SPF record, maintaining 90-day result history for diffing.

## Known failure modes

- Domain not previously checked — no baseline exists for comparison, changed flag may be absent or null
- Domain SPF record unavailable or DNS lookup fails — check cannot complete
- Invalid domain format provided — request rejected
- 90-day history window exceeded — previous result no longer available, treated as first check
- Rate limiting or payment failure — $0.02 USDC per call required

## How this service works

Change watch for spf authorizes customerio: 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 SPF authorization answer (true/false for whether Customer.io is authorized), a changed flag indicating whether the result differs from the previous call (stored up to 90 days), a list of fields that changed with before/after values, and the timestamp of when the domain 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-customer-io-change-watch-476d0b9b/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)