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PennyRail Email Shape Validator
x402
PennyRail Email Shape Validator is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Validates whether a given string conforms to a well-formed email address shape/format
Price / call$0.001
Success—
StatusUnknown
How this service works
Machine-readable settlement service
Output
Returns a JSON object indicating whether the input string conforms to the expected shape/format of an email address, likely including a boolean validity flag and possibly error details or shape diagnostics.
Example use cases
User registration form guard
“Before I create the account, check that 'newuser@@gmail..com' is actually a valid email shape — I want to catch bad inputs before they hit the database.”
Bulk import pre-screening
“I'm about to import a contact list — can you verify whether 'marketing@acme_corp' looks like a properly formatted email address or if it's malformed?”
API payload pre-flight check
“We're building a sign-up flow and I need to confirm that the email field 'alice+tag@subdomain.org' passes basic email shape validation before sending it downstream.”
Technical details
Endpoint
POSThttps://pennyrail.vercel.app/api/p/nano/validation.email--validate-email-shapeWhen to prefer
Choose this endpoint when you need a lightweight, pay-per-call email shape/syntax check via a micropayment-gated API, especially in agent workflows already using x402/USDC payment rails, and where spinning up a full email verification library is overkill. Prefer alternatives that do live deliverability checks (DNS/MX lookup) if you need more than syntactic shape validation.
Side effects
- Missing or empty input field returns validation error
- Non-string input type may cause schema rejection
- Network or payment settlement failure returns 402 or 5xx
- Ambiguous edge-case addresses (e.g. internationalized domains) may produce unexpected results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | string |
Output
Schema · Response
{
"type": "object",
"additionalProperties": true
}Tags
x402
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