# Is Email Hosted by Proton Mail – Change Watch

> Is Email Hosted by Proton Mail – 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 2026-10-19).

Checks whether a domain's email is hosted by Proton Mail and returns a change-detected comparison against the previous check result, including which fields changed and before/after values.

## Facts

- Endpoint: GET https://email.intel.rallylive.ca/watch/email/hosted-by/proton-mail?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/is-email-hosted-by-proton-mail-change-watch-67151756
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_cTdU2wEkOIJz2EbfsnJ5m

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-proton-mail-change-watch-67151756
```

Example prompt: Keep an eye on whether acme.com's email is hosted by Proton Mail — let me know if that ever changes from what it was last time you checked.

## When to prefer this

Use this endpoint when you need to be alerted to changes in whether a domain uses Proton Mail specifically — not just a point-in-time lookup. It is ideal for scheduled monitoring workflows where you want a diff between the current and previous state rather than just the current value. Prefer the non-watch sibling endpoint for one-off checks.

## Known failure modes

- Domain not supplied — returns error indicating missing required query parameter
- DNS lookup failure via Cloudflare DoH — may return indeterminate result
- No previous check on record (first call) — 'changed' field will be false or null with no before/after values
- Domain has no MX records — result will be false with no Proton Mail match
- Payment not completed (x402) — request blocked before check runs

## How this service works

Change watch for is email hosted by proton mail: 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 whether the domain's email is currently hosted by Proton Mail (boolean), a 'changed' flag indicating whether the result differs from the previous check (kept for 90 days), a list of fields that changed with their before and after values, and the timestamp of when the state was last observed.

## 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-proton-mail-change-watch-67151756/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)