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SiteCheck Email Pre-Check
x402
SiteCheck Email Pre-Check is a paid API for AI agents from api.sitecheck-api.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-12).
Validates one or more email addresses without SMTP connection, checking MX records, disposable status, typo detection, and deliverability risk
Price / call$0.001
Success—
StatusUnknown
How this service works
Pay-per-call tools for AI agents: image generation, speech-to-text, text-to-speech, embeddings, LLM chat, website audits and contact enrichment, web page to Markdown reader, PDF to text, sitemap URLs, tech stack detection, translation, exchange rates, e-mail pre-check, domain RDAP/DNS lookup, Solana token checks, trending tokens and wallet holdings, plus business and compliance data (EU VAT/VIES, IBAN, LEI/GLEIF, US recalls, OSHA/EPA violations, UK insolvency notices). Plus prediction-market search, briefs, quotes and unsigned buy transactions, powered by Panta. Payment: x402, USDC on Base, Solana or Arc. No signup, no API key.
Output
Returns a JSON object with: 'verdict' (e.g. 'risky', 'safe'), boolean flags for 'mx', 'disposable', 'role', 'freeProvider', the 'normalized' email, 'mxHosts' array, a 'suggestion' if a typo is detected, 'reasons' array explaining issues, and a note clarifying no SMTP connection is made.
Example use cases
Pre-screen signup form email
“Before I add this new user to our list, check if 'sarah.jones@yopmial.com' is a real, deliverable email or if it looks like a typo or throwaway address.”
Bulk validate marketing list
“I have a batch of 30 emails from last month's leads — can you run them through an email pre-check to find which ones are risky, disposable, or have likely typos? Here they are: alice@gmail.com, bob@mailinator.com, carol@company.com...”
Detect role address before outreach
“I want to reach out to 'info@acmecorp.com' — is that a role address, does the domain have valid MX records, and is it generally safe to email?”
Technical details
Endpoint
GEThttps://api.sitecheck-api.workers.dev/api/email-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, no-signup, pay-per-call email pre-screening that goes beyond simple regex — detecting typos with fix suggestions, MX record validity, disposable/temp email services, role addresses, and free providers, all without making an SMTP connection or requiring API key setup. Ideal for AI agent workflows where email quality gates are needed at low volume or in real-time.
Side effects
- Missing 'email' or 'emails' query parameter returns an error
- Invalid email format may return unknown verdict with no suggestion
- Domain with no MX records returns mx:false
- Up to 50 emails limit exceeded for batch requests
- Transient DNS lookup failures may cause inconclusive results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"mx": true,
"note": "No SMTP connection is made: 'unknown' means nothing is wrong with the address and its domain, not that the mailbox exists.",
"role": false,
"email": "john.smith@gmial.com",
"domain": "gmial.com",
"mxHosts": [
"mx.gmial.com"
],
"reasons": [
"typo-suspected"
],
"verdict": "risky",
"disposable": false,
"normalized": "john.smith@gmial.com",
"suggestion": "john.smith@gmail.com",
"freeProvider": false
}
}Tags
x402
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