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Email Syntax Checker (RFC 5322, No DNS)
x402
Email Syntax Checker (RFC 5322, No DNS) is a paid API for AI agents from intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Validates email address syntax against RFC 5322 rules — checking local part, domain shape, dots, invalid characters, missing TLD, and length limits — without performing any DNS lookup.
Price / call$0.01
Success—
StatusUnknown
How this service works
Fast email syntax check (no DNS): validates local part and domain shape per RFC 5322 practical rules, flags leading/trailing/double dots, invalid characters, missing TLD and length limits. Sub-millisecond input validation for forms and agents. $0.01 per address.
Output
Returns a syntactic validity verdict for the submitted email address along with specific flags for any rule violations found, such as leading/trailing/double dots, invalid characters in the local part or domain, missing TLD, or violations of length limits — all evaluated purely against RFC 5322 practical rules with no DNS resolution.
Example use cases
Form input validation before submission
“Before submitting this signup form, check if the email address 'user@.example.com' is correctly formatted — I just want a syntax check, no need to ping DNS.”
Bulk pre-filter of scraped contacts
“I have an email address 'first.last@domain' that was scraped from a webpage — can you run a quick RFC 5322 syntax check to see if it's even valid before I add it to my list?”
Catching typos in user-entered email
“A user just typed 'alice@exam..ple.co' into our registration form — does this pass basic email syntax validation, and if not, what's wrong with it?”
Technical details
Endpoint
GEThttps://intel.rallylive.ca/email/syntaxWhen to prefer
Choose this endpoint when you need instant, sub-millisecond email format validation with no network dependency on DNS — ideal for real-time form validation, pre-filtering contact lists before DNS/SMTP checks, or agent pipelines where speed and offline-safe operation matter. Prefer it over MX-check or SMTP-verify endpoints when you only need structural correctness and cannot afford DNS latency or want to avoid external lookups.
Side effects
- Missing email address parameter returns an error
- Malformed query string may result in a 400 bad request
- Payment not included or insufficient USDC results in a 402 Payment Required response
- Edge-case RFC ambiguities (e.g. quoted local parts) may not be fully handled
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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