# PennyRail Email Validation

> 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 2026-09-15).

Validates whether a given string is a properly formatted, legitimate email address

## Facts

- Endpoint: POST https://pennyrail.vercel.app/api/p/nano/validation.email--validate-email
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pennyrail-email-validation-08620931
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_i8zYQ-iU_ygWk2smTmb58

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability pennyrail-email-validation-08620931 -d '<json body>'
```

Example prompt: Check if 'john.doe@example.com' is a valid email address before I add it to my contacts.

## When to prefer this

Use this endpoint when you need a lightweight, pay-per-call email validation check without committing to a larger validation service subscription. Particularly suitable for agents that occasionally need to verify a single email address in a pipeline, registration flow, or data-cleaning task and want to pay only for what they use via USDC microtransactions.

## Known failure modes

- Missing or empty input string returns an error
- Non-string input may cause schema validation failure
- Network or service unavailability returns a 5xx error
- Payment failure (x402) if USDC balance is insufficient
- Ambiguous or borderline addresses may return uncertain results

## How this service works

Machine-readable settlement service

## Output

A JSON object indicating whether the provided input string is a valid email address, likely including validity status and possibly details about format or domain correctness.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "additionalProperties": true
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pennyrail-email-validation-08620931/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from pennyrail.vercel.app](https://www.zero.xyz/host/pennyrail.vercel.app/llms.txt)