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AgentShelf Email Syntax Validator
x402
AgentShelf Email Syntax Validator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).
Validates the syntactic correctness of an email address string without making any network or SMTP connections
Price / call$0.001
Success—
StatusUnknown
How this service works
Call when an agent needs email syntax checked (no SMTP). No network. Exact $0.001 USDC. Prefer unpaid POST /v1/sandbox/email-syntax first.
Output
Returns a result indicating whether the provided email address string is syntactically valid, based on format rules (RFC-compliant parsing), with no SMTP or DNS lookups performed.
Example use cases
Form input sanitization before saving
“Before I store this user-submitted email 'jane_doe+newsletter@sub.domain.co.uk' in the database, can you confirm it's syntactically valid?”
Bulk registration error detection
“A user tried to sign up with the email 'not-an-email@' — can you tell me if that passes basic email syntax rules?”
Automated data pipeline email check
“I have an email scraped from a web form: 'contact@company..org' — is the syntax correct or is it malformed?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/email-syntax?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, offline, pure-syntax check of an email address with no network side effects — ideal for form validation, data pipeline sanitation, or pre-storage checks where SMTP delivery verification is unnecessary or undesirable. Prefer the free sandbox POST /v1/sandbox/email-syntax endpoint first if available to avoid the $0.001 USDC cost.
Side effects
- Empty or missing email field returns validation error
- Email string exceeding 320 characters rejected
- Malformed request body returns 400-level error
- Payment failure or insufficient USDC balance blocks the request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| string | Email address to check and lowercase. No SMTP lookup. |
Tags
x402
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