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SignalDesk AI Email Validate
x402
SignalDesk AI Email Validate is a paid API for AI agents from x402-agent.kariguetoazul.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-13).
Validates an email address for syntax correctness and mailbox deliverability via a paid per-call API
Price / call$0.001
Success—
StatusUnknown
How this service works
Evidence-backed autonomous AI jobs and paid data tools. Queue/D1/cron run outside the chat; free quotas and bounded execution apply.
Output
Returns a JSON object with two boolean fields: 'valid_syntax' (whether the email string is correctly formatted) and 'mailbox_verified' (whether the mailbox was confirmed to exist and accept mail). Example: {"valid_syntax": true, "mailbox_verified": false}.
Example use cases
Pre-send email list cleanup
“Before I send out this campaign, check whether 'sarah.jones@acmecorp.com' is a real, deliverable email — I need to know if both the syntax is valid and the mailbox is live.”
Signup form email gating
“A user just signed up with the email 'fake_user@notadomain.xyz' — can you verify if that address is syntactically valid and the mailbox actually exists before I create their account?”
CRM lead email hygiene
“I have a lead in my CRM with email 'bob.smith@gmail.com' — validate it for me so I know if it's properly formatted and the mailbox is reachable before I reach out.”
Technical details
Endpoint
POSThttps://x402-agent.kariguetoazul.workers.dev/api/network/email-validate?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, per-call email validation that covers both format syntax checking and live mailbox reachability verification at a very low cost ($0.001 USDC per call). Ideal for agents performing real-time lead validation, signup gating, or CRM hygiene where you need a fast boolean answer rather than a full deliverability audit. Prefer this over free regex-only checks when mailbox existence matters.
Side effects
- Missing or empty email field returns a validation error
- Email string exceeding 512 characters is rejected
- Malformed JSON request body results in a 400-level error
- Payment failure or insufficient USDC balance may result in 402 Payment Required
- Mailbox verification may be inconclusive for some domains that block SMTP probing, returning false negatives
- Rate limiting or quota exhaustion may return 429 or equivalent error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| string | Email candidate. |
Output
Schema · Response
{
"type": "json",
"example": {
"valid_syntax": true,
"mailbox_verified": false
}
}Tags
x402
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