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FastX402 Lab Email Syntax Checker & Normalizer
x402
FastX402 Lab Email Syntax Checker & Normalizer is a paid API for AI agents from fastx402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-17).
Validates email address syntax and returns its normalized form (lowercase, Gmail dots and +tags stripped), local part, and domain — without contacting any mail server.
Price / call$0.001
Success—
StatusUnknown
How this service works
146 pay-per-call tools for AI agents, from $0.001 per request in USDC on Base or Solana with x402. No account, no API key.
Output
A JSON object containing: the original email as submitted, a boolean 'valid' flag indicating syntax correctness, the 'local' part (before the @), the 'domain' (after the @, lowercased), and a 'normalized' form with lowercase applied and Gmail-specific aliases (dots in local part and +tags) removed.
Example use cases
Deduplicating sign-up email list
“I have a bunch of sign-up emails and I suspect some people registered multiple times using Gmail dot tricks or plus tags — can you normalize 'jane.doe+promo@gmail.com' so I can compare it against existing accounts?”
Cleaning a CRM contact list
“Before I import contacts into our CRM, can you validate and normalize this email address 'Bob.Jones+updates@GoogleMail.com' so it's in a clean, canonical form?”
Validating user input at registration
“A user just entered 'Alice..Smith+test@Gmail.com' in our sign-up form — can you check if the syntax is valid and give me the normalized version so I can store a canonical email?”
Technical details
Endpoint
GEThttps://fastx402.tools/email-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need fast, offline email syntax validation and normalization — particularly for deduplicating Gmail addresses that use dot tricks or plus-tag aliases. It is ideal for sign-up flows, contact list cleaning, and canonical identity matching. Do not use it when you need to verify actual deliverability (MX lookup or SMTP probe) — it explicitly does not contact any mail server.
Side effects
- Missing 'email' query parameter returns an error response
- Malformed/unparseable email returns valid=false with possibly empty normalized field
- Extremely long or unusual inputs may return unexpected results
- Does not perform MX or SMTP checks — a syntactically valid email may not be deliverable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"email": "John.Smith+news@GoogleMail.com",
"local": "John.Smith+news",
"valid": true,
"domain": "googlemail.com",
"normalized": "johnsmith@gmail.com"
}
}Tags
x402
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