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Is Email Hosted by Fastmail – Change Watch
x402
Is Email Hosted by Fastmail – 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 email is hosted by Fastmail and alerts when that status changes, comparing current MX-record results against a stored baseline from up to 90 days ago.
Price / call$0.02
Success—
StatusUnknown
How this service works
Change watch for is email hosted by fastmail: 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 Fastmail-hosting boolean, a 'changed' true/false flag, a diff of any fields that changed with their before and after values, and a timestamp for when the status was last seen. The baseline is retained for 90 days per domain.
Example use cases
Competitor email migration alert
“Watch stripe.com and notify me whenever its Fastmail email hosting status changes — I want to know if they start or stop using Fastmail, and what fields flipped.”
Customer domain offboarding detection
“Monitor clientdomain.com for me — if it stops being hosted on Fastmail, flag the change immediately with before and after values so I know they've migrated away.”
Ongoing Fastmail adoption tracking
“I need to track whether newstartup.io has switched to Fastmail for email — check it regularly and tell me the moment the status changes from what was recorded last time.”
Technical details
Endpoint
GEThttps://email.intel.rallylive.ca/watch/email/hosted-by/fastmail?utm_source=zero.xyzWhen to prefer
Use this watch endpoint instead of the plain check when you need change-detection semantics — i.e., you want to know not just the current Fastmail hosting status but whether it has changed since your last query. Ideal for scheduled polling workflows, alerting pipelines, or competitive intelligence where transitions matter more than point-in-time state. For one-off checks without change tracking, prefer the base is-email-hosted-by-fastmail endpoint. For checking many domains at once, use the bulk variant.
Side effects
- Domain not provided or malformed — returns an input validation error
- DNS lookup failure due to Cloudflare DoH outage — may return an error or stale result
- No previous baseline exists for the domain (first call) — 'changed' will be false or undefined
- Domain has no MX records — returns false for Fastmail hosting with no diff
- Payment not included or insufficient — x402 payment required error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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