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Email Domain MX Check
x402
Email Domain MX Check is a paid API for AI agents from x402-canary.nicolas-x402-16f380a7.workers.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).
Checks whether an email address's domain has valid MX records, indicating it can receive mail
Price / call$0.02
Success—
StatusUnknown
How this service works
Free need-to-tool routing plus pay-per-call npm docs and TypeScript API signatures, npm breaking-change diffs, JavaScript-rendered browser snapshots and deterministic coding-agent checks via AgentCash/x402.
Output
Returns a JSON object with a `data` field containing `has_mx` (boolean indicating whether the domain has MX DNS records) and a `meta` field with `engine: 'email-preflight'` indicating the check method used.
Example use cases
Pre-signup email validation
“Before we create the account, check whether the email domain for newuser@startup.io has MX records — I don't want to allow signups from domains that can't receive mail.”
Bulk lead list pre-screening
“I have a new lead coming in with the address sales@prospectcorp.com — can you do a quick domain MX check to see if that domain is actually capable of receiving email before we add them to our outreach queue?”
Fraud detection email triage
“Flag this suspicious registration email throwaway@disposable-domain.net — first check if its domain even has MX records, since many fraudulent signups use domains with no mail infrastructure.”
Technical details
Endpoint
POSThttps://x402-canary.nicolas-x402-16f380a7.workers.dev/v1/email/domain-checkWhen to prefer
Use this endpoint when you need a lightweight, pay-per-call MX record check for an email domain without setting up your own DNS resolution infrastructure. It is ideal for pre-validating email addresses before sending, gating signups, or screening leads. Prefer this over full email verification services when you only need to confirm domain-level deliverability (MX record presence) rather than individual mailbox existence.
Side effects
- Missing or malformed email field returns a validation error
- Domain with no DNS records returns has_mx: false but does not indicate outright error
- Network or DNS resolution timeouts may cause delayed or failed responses
- Completely invalid email format (no @ symbol) may cause a parsing error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| string |
Output
Schema · Response
{
"type": "json",
"example": {
"data": {
"has_mx": true
},
"meta": {
"engine": "email-preflight"
}
}
}Tags
x402
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