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Nero Labs Email Check
x402
Nero Labs Email Check is a paid API for AI agents from x402-agent-tools.nerolabs.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-22).
Validates a single email address by checking syntax, live MX records, disposable domain lists, role-based prefixes, and typo detection — returning valid, risky, or invalid with reasons.
Price / call$0.001
Success—
StatusUnknown
How this service works
Pay-per-call tools for AI agents, 31 in all: read web pages and RSS feeds, OCR, PDF text, transcription; email, phone and domain checks; UK, Irish and Polish company lookups and UK risk reports; website contacts, tech stack and SEO audits; PageSpeed; AI review, job post and row enrichment; data cleaning, joins, dedupe and diffs; US and EU compliance rules. No account or API key: pay each call in USDC on Base over x402.
Output
A JSON object with: status (valid/risky/invalid), primary reason code, an allReasons array listing all issues found, a didYouMean field with a corrected domain if a typo was detected, the normalized email, the detected mailServer, and boolean flags for syntaxValid, isDisposable, isRoleAddress, isFreeProvider, and domainReceivesMail.
Example use cases
CRM lead email screening
“Before I import these leads into my CRM, check whether john.smith@mailinator.com is a real, usable email — tell me if it's disposable, a role address, or has a typo I should correct.”
Signup form validation agent
“A user just entered info@gmial.com on our registration form — can you validate it for me, flag if it's a role-based inbox or throwaway, and suggest the correct domain if it looks like a typo?”
Sales outreach list hygiene
“I'm about to run an email campaign. Check sales@yahoo.com for me — is it valid, risky, or invalid? Let me know if it's a shared role inbox, free provider, or if the domain can't receive mail.”
Technical details
Endpoint
GEThttps://x402-agent-tools.nerolabs.workers.dev/email-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need fast, low-cost email validation that combines syntax checking, live MX lookup, disposable domain detection, role-address flagging, and typo correction in a single call without triggering SMTP probes. Prefer it over full SMTP-verification services when you want to avoid blacklisting risk or when speed and cost matter more than absolute deliverability confirmation. Ideal for pre-flight checks on lead lists, signup forms, and outreach pipelines.
Side effects
- Missing or malformed email query parameter — returns error
- Domain exists but has no MX records — domainReceivesMail: false, status likely invalid
- Valid syntax but disposable domain — status invalid with reason disposable_domain
- Network or DNS timeout during live MX lookup — may return degraded result
- Email passes all checks but mailbox does not exist (no SMTP ping performed — delivery not guaranteed)
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"email": "info@mailinator.com",
"domain": "mailinator.com",
"reason": "disposable_domain",
"status": "invalid",
"allReasons": [
"disposable_domain",
"role_address"
],
"didYouMean": null,
"mailServer": "mail.mailinator.com",
"normalized": "info@mailinator.com",
"syntaxValid": true,
"isDisposable": true,
"_example_note": "Real output, trimmed: long lists cut to their first items and long text shortened.",
"isRoleAddress": true,
"isFreeProvider": false,
"domainReceivesMail": true
}
}Tags
x402
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