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ONE Engine Email Syntax Validator
x402
ONE Engine Email Syntax Validator is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.0009/call, status unknown (last checked 2026-10-02).
Validates whether an email address string is syntactically well-formed
Price / call$0.0009
Success—
StatusUnknown
How this service works
Low-cost pay-per-call utility APIs for autonomous agents using x402 on Base.
Output
A JSON object with a single boolean field 'valid' indicating whether the submitted email string conforms to standard email syntax rules. Returns {valid: true} for well-formed addresses and {valid: false} for malformed ones.
Example use cases
Form input validation before submission
“Before I store this user's profile, can you check if the email they entered — 'user@domain' — is actually a valid email format?”
Screening scraped contact data
“I scraped a list of email addresses from a webpage and got 'notanemail@@broken' — can you verify whether that's a properly formatted email address?”
Pre-send email validation in agent workflow
“I'm about to send an automated message to 'support@.missingdomain.com' — can you validate whether that email address is syntactically correct first?”
Technical details
Endpoint
POSThttps://one-search.one-engine.workers.dev/v1/email/syntax?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, cheap, stateless syntax check on an email string with no side effects — ideal for agent pipelines that need to filter or validate user-supplied or scraped email addresses before passing them downstream. At $0.0009 USDC per call it is cost-effective for high-volume validation loops. Prefer a deliverability or MX-check service instead if you need to confirm the mailbox actually exists and can receive mail.
Side effects
- Missing or empty email field in request body — likely returns an error or false
- Non-string input type for email field may cause parsing errors
- Payment failure via x402 if wallet lacks sufficient USDC on Base
- Network timeout if Cloudflare Workers instance is cold or overloaded
- Only checks syntax, not deliverability — a valid response does not mean the mailbox exists
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| string |
Output
Schema · Response
{
"type": "json",
"example": {
"valid": true
}
}Tags
x402
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