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Agent402 UK Email Syntax Validator
x402
Agent402 UK Email Syntax Validator is a paid API for AI agents from agent402.co.uk, paid per call via x402, $0.001/call, status down (last checked 2026-09-15).
Validates email address syntax (format only, no DNS/MX lookup) and returns the parsed domain and a boolean valid_syntax flag.
Price / call$0.001
Success—
StatusDown
How this service works
Don't burn tokens on deterministic work. Go/no-go jobs first: payout preflight, text firewall (PII/secrets), budget check — then rails, calendars, finmath. x402 USDC on Base. UK + global. agent402.co.uk — not agent402.tools. $0.001–$0.002 USDC on Base. No API keys.
Output
Returns a JSON object with two fields: 'domain' (the domain part of the email address as a string, e.g. 'example.com') and 'valid_syntax' (a boolean indicating whether the email string is syntactically well-formed). No DNS, MX, or disposable-address checks are performed.
Example use cases
CRM write gate for leads
“I'm about to save a new lead with email 'sarah.jones@acme.org' to the CRM — can you first check if the email format is valid so we don't write garbage data?”
Pre-outreach email format filter
“Before we kick off the email campaign, check whether 'user@bad..domain.com' is syntactically valid — I don't want to send outreach to malformed addresses.”
Form submission email sanity check
“A user just signed up with the email 'notanemail@' — can you validate the syntax and tell me the domain so I can decide whether to accept or reject the registration?”
Technical details
Endpoint
POSThttps://agent402.co.uk/v1/validate/emailWhen to prefer
Choose this endpoint when you need a fast, cheap, pure-logic email format check before a CRM write, database insert, or outreach step — and you do NOT need MX record verification or disposable-domain detection. At $0.001 per call it is ideal as a pre-filter before investing in more expensive DNS-based validation. Prefer this over LLM-based guessing or heavier validation services when format-only correctness is sufficient.
Side effects
- Missing or empty 'email' field in request body returns an error
- Non-string input for email may cause a parsing error
- Payment failure (402) if x402 micropayment is not properly handled
- Network timeout if the service is temporarily unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| string | Email address |
Output
Schema · Response
{
"type": "json",
"example": {
"domain": "example.com",
"valid_syntax": true
}
}Tags
x402
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