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Email Quick Syntax & Disposable Check
x402
Email Quick Syntax & Disposable Check is a paid API for AI agents from freetier-agent-api.pages.dev, paid per call via x402, $0.0025/call, status unknown (last checked 2026-11-01).
Offline email validation: RFC syntax check, disposable-domain flag (~9,900 domains), role address and free-mail flags — no DNS or MX lookup, fastest possible check.
Price / call$0.0025
Success—
StatusUnknown
How this service works
Invoice-to-JSON, on-chain tools (transaction explainer + payment check, wallet profile, contract ABI, ERC-20 token risk), company contacts and web-to-RAG for AI agents. Pay per call with x402 (USDC on Base). No signup, no API key.
Output
Returns a JSON object with: email (echoed back), syntax_ok (boolean), disposable (boolean, based on ~9,900 known disposable domains), role (boolean indicating role-based address like info@ or support@), and verdict (string such as 'risky' or 'ok') — all determined offline without DNS or MX lookups.
Example use cases
Signup form email screening
“Before I accept this registration, can you check if the email 'user123@guerrillamail.com' is disposable, a role address, or has a syntax problem? I just need a fast check, no DNS.”
Lead list quality filter
“I have a lead email 'sales@tempmail.org' — can you tell me if it's from a disposable domain or is a role-based address so I know whether to trust it?”
CRM data hygiene audit
“Can you validate the email 'noreply@gmail.com' — is the syntax valid, is it a disposable domain, and is it flagged as a role address or free-mail provider?”
Technical details
Endpoint
GEThttps://freetier-agent-api.pages.dev/api/email-verify-quick?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need the fastest possible email check and do not require DNS or MX record verification. It is ideal for real-time signup validation, bulk lead list screening, or any scenario where latency matters and offline heuristics (syntax, disposable domain list, role/free-mail flags) are sufficient. Use the sibling email-verify endpoint instead when deliverability confirmation via MX lookup is required.
Side effects
- Missing email query parameter returns an error
- Malformed or missing input schema results in 400-level response
- Disposable domain list may not cover newly created throwaway domains
- No MX/DNS check means deliverability is not confirmed — use email-verify endpoint for that
- Free-mail flag coverage depends on built-in list completeness
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"role": true,
"email": "info@mailinator.com",
"verdict": "risky",
"syntax_ok": true,
"disposable": true
}
}Tags
x402
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