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PennyRail Email Validation
x402
PennyRail Email Validation is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Validates whether a given string is a properly formatted email address
Price / call$0.001
Success—
StatusUnknown
How this service works
Machine-readable settlement service
Output
Returns a JSON object with an 'operation' field (string identifying the validation operation performed) and a 'result' field (indicating whether the input string is a valid email address, likely a boolean or status indicator), plus any additional metadata fields.
Example use cases
Form submission email gating
“Before I save this new user registration, can you check if 'sarah_jones@mycompany.org' is a properly formatted email address?”
Bulk onboarding data cleanup
“I have an email string 'not-an-email@@broken' from an import — can you tell me if that's actually a valid email format?”
API input sanitization
“Can you validate whether 'user+tag@sub.domain.co.uk' is a correctly formatted email before I pass it downstream to our mailing service?”
Technical details
Endpoint
POSThttps://pennyrail.vercel.app/api/f/validation.emailWhen to prefer
Choose this endpoint when you need a lightweight, pay-per-call ($0.001 USDC) email format validation with no setup or API key required, particularly in agent workflows using x402 micropayment protocol. Best for single-string validation in automated pipelines where you want a machine-readable settlement service rather than a full identity verification or email deliverability check.
Side effects
- Missing 'input' field in request body returns validation error
- Empty string input may return invalid result or error
- Malformed JSON body causes request rejection
- Network timeout on Vercel cold start
- Ambiguous result schema — 'result' field type is not strictly typed, so boolean vs string interpretation may vary
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | string | string |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| resultrequired | — | |
| operationrequired | string |
Tags
x402
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