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Email Syntax Check Watch (Change Detection)
x402
Email Syntax Check Watch (Change Detection) is a paid API for AI agents from intel.rallylive.ca, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).
Checks email address syntax validity and detects changes compared to the previous check for the same email, returning current result, a changed flag, field-level diffs with before/after values, and last-seen timestamp.
Price / call$0.02
Success—
StatusUnknown
How this service works
Change watch for email syntax check: runs the check and compares it with the result from your previous call for the same email (kept 90 days), returning the current answer, changed true/false, exactly which fields changed with before/after values, and when it was last seen. Call it on a schedule to be told when fast email syntax check changes. $0.01 per check.
Output
Returns the current email syntax check result (valid/invalid), a boolean 'changed' flag indicating whether the result differs from the previous call for that email (stored up to 90 days), a list of exactly which fields changed with before and after values, and the timestamp of when the email was last seen/checked.
Example use cases
Email onboarding quality monitoring
“Check the syntax of signups@mybrand.co every day and alert me if the validation result ever changes — I want to see what specifically changed and what the old value was.”
Automated email field drift detection
“I need you to poll the email syntax check for contact@partner-domain.org on a schedule and tell me right away if the changed flag comes back true, including the before and after values for any fields that flipped.”
Email validity regression tracking
“Watch the syntax check result for test.address+filter@subdomain.example.net and compare it to the last stored result — did anything change? Show me a diff if so.”
Technical details
Endpoint
GEThttps://intel.rallylive.ca/watch/email/syntaxWhen to prefer
Choose this endpoint when you need change detection on email syntax checks, not just a one-off validation. It is ideal for scheduled/polling workflows where you want to be notified only when the validity result actually changes, with a structured diff of what changed. Prefer this over a simple syntax check when you need historical comparison, audit trails, or event-driven automation triggered by validation state changes.
Side effects
- No email query parameter provided — returns error indicating required input missing
- Email not previously checked — no stored baseline, so 'changed' will be false or unavailable for first call
- Stored result expired (older than 90 days) — comparison baseline lost, treated as first-time check
- Invalid HTTP method — only GET is supported
- Payment failure — x402 payment not provided or insufficient, request rejected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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