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Email Verification Batch API
x402
Email Verification Batch API is a paid API for AI agents from freetier-agent-api.pages.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-11-01).
Validates up to 20 email addresses per call, checking syntax, DNS MX/A records, disposable/role/free-mail flags, and returning a per-address verdict and summary — no SMTP probing or data storage.
Price / call$0.005
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 a count of emails checked, a per-address results array (email, has_mx, verdict, role, disposable, free-mail flags), and a summary object grouping verdicts (e.g. risky: 2, valid: 10). No SMTP probing is performed and no data is stored.
Example use cases
Pre-send list hygiene for email campaign
“Before I send this newsletter, check these 15 emails for validity: user1@domain.com, noreply@company.org, jane@tempmail.com... flag any that are disposable, role-based, or have no MX records so I know which to remove.”
Signup form spam filter
“A user just signed up with support@mailinator.com and admin@guerrillamail.com — can you verify those addresses and tell me if they're disposable or role-based so I can decide whether to block them?”
CRM contact data quality check
“I have a batch of 20 contacts I imported — can you verify their emails and give me a summary of how many are risky, invalid, or free-mail so I can prioritize which ones to follow up with?”
Technical details
Endpoint
GEThttps://freetier-agent-api.pages.dev/api/email-verify-batch?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to validate multiple email addresses at once (up to 20) without triggering SMTP connections or storing any data. It is ideal for pre-flight checks before email campaigns, filtering signups, or cleaning CRM lists. Prefer the sibling single-email endpoint for individual lookups; prefer this batch endpoint when processing lists to minimize API calls and cost.
Side effects
- More than 20 emails in a single call — the API enforces a maximum of 20
- Malformed comma-separated input — parsing errors if emails are not properly delimited
- DNS lookup failures for domains with unusual configurations — may return inconclusive MX status
- Network timeouts on DNS-over-HTTPS resolution for slow/unresponsive domains
- Missing required 'emails' query parameter — request rejected
- Payment failure or insufficient USDC balance — 402 response blocking the call
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"count": 2,
"results": [
{
"role": true,
"email": "info@stripe.com",
"has_mx": true,
"verdict": "risky"
}
],
"summary": {
"risky": 2
}
}
}Tags
x402
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