# Is Email Hosted by Postmark Watch

> Is Email Hosted by Postmark 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 email is hosted by Postmark and alerts when that status changes, comparing the current check against the previous result stored for 90 days.

## Facts

- Endpoint: GET https://email.intel.rallylive.ca/watch/email/hosted-by/postmark?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/is-email-hosted-by-postmark-watch-7bfea005
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QVsOytQQPDcy3HLJn72a0

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 is-email-hosted-by-postmark-watch-7bfea005
```

Example prompt: Keep an eye on acmecorp.com and let me know if it ever starts or stops using Postmark to host its email — compare it to last time you checked and tell me what changed.

## When to prefer this

Use this endpoint when you need to detect changes in Postmark email hosting status for a domain over time rather than just a one-time lookup. It is ideal for scheduled monitoring workflows where you want to be alerted only when something changes, avoiding noise from repeated identical checks.

## Known failure modes

- Domain not previously checked — no prior result to compare against, so 'changed' will be false or baseline
- Invalid or unresolvable domain returns an error
- DNS lookup timeouts may cause inconclusive results
- Results older than 90 days are purged, triggering a fresh baseline instead of a diff

## How this service works

Change watch for is email hosted by postmark: 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 Postmark hosting status for the domain, a boolean indicating whether it has changed since the last check (up to 90 days ago), a list of fields that changed with their before and after values, and a timestamp of when the status 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/is-email-hosted-by-postmark-watch-7bfea005/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)