# Toll402 Email List Validator

> Toll402 Email List Validator is a paid API for AI agents from toll402.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).

Validates a batch of up to 500 email addresses and returns their deliverability status, paid per call in USDC via x402.

## Facts

- Endpoint: POST https://toll402.dev/v1/t/email_list_validate?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/toll402-email-list-validator-6b20f528
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gwP6FXp6984-P7V-h3x9X

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 toll402-email-list-validator-6b20f528 -d '<json body>'
```

Example prompt: Can you validate these email addresses for me and tell me which ones are deliverable: alice@example.com, bob@fakeemail.xyz, carol@company.org?

## When to prefer this

Choose this endpoint when you need to validate multiple email addresses in a single API call (up to 500 at once) without signing up for a dedicated email validation service. It is ideal for agents that need to clean lists on demand, verify form submissions, or do pre-send hygiene checks, paid at $0.001 USDC per call with no subscription required.

## Known failure modes

- Empty or missing emails array returns a validation error
- More than 500 emails in a single request exceeds the limit and is rejected
- Malformed email strings may be flagged as invalid without a specific error message
- Payment failure via x402 results in a 402 response before processing begins
- Network timeout if the batch is large and processing takes too long

## How this service works

The OpenRouter for AI-agent tools: one gateway, one wallet, every capability. Built-in tools, forged tools, a global verified business directory and 2,000+ aggregated x402 services, all paid per call in USDC via x402 (HTTP 402). No signup, no API key.

## Output

Returns a JSON object with an 'ok' boolean and per-email validation results indicating whether each address is valid and deliverable. The response covers the full batch of up to 500 submitted emails.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "required": [
      "emails"
     ],
     "properties": {
      "emails": {
       "type": "array",
       "items": {
        "type": "string"
       },
       "maxItems": 500,
       "minItems": 1
      }
     },
     "additionalProperties": false
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/toll402-email-list-validator-6b20f528/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from toll402.dev](https://www.zero.xyz/host/toll402.dev/llms.txt)