# 402utils Email Validation

> 402utils Email Validation is a paid API for AI agents from 402utils.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-13).

Validates an email address for syntax (RFC 5322), domain/MX record existence via DoH, disposable domain detection, and role account detection — without SMTP probing.

## Facts

- Endpoint: GET https://402utils.com/v1/email-check?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/402utils-email-validation-09269884
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-XwOI_e90019-pFUG1ge2

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 402utils-email-validation-09269884
```

Example prompt: Can you check if 'john.doe@mailinator.com' is a valid email to accept — I want to know if the syntax is correct, whether the domain resolves, if it's a disposable email service, and whether it's a role account?

## When to prefer this

Use this endpoint when you need a lightweight, non-intrusive email check at signup or before sending — covering syntax, domain health, disposable detection, and role-account flagging in a single call without SMTP probing. Prefer it over SMTP-based validators when avoiding spam flags on mail servers is important, and over manual regex checks when you also need DNS and blocklist coverage.

## Known failure modes

- Missing 'email' query parameter returns an error response
- Malformed email string may return syntaxValid: false with other checks skipped
- Domain with no MX or A records returns domainExists: false but does not confirm mailbox absence
- DoH resolution failure may cause inconclusive domainExists result
- Rate limiting or payment failure (x402) returns 402 Payment Required

## How this service works

Validate an email address before you accept a signup or send to it: RFC 5322 syntax, whether the domain resolves and its MX records, whether it is a disposable/throwaway domain (community blocklist), and whether it is a role account (info@, support@…). DNS is checked over DoH. No SMTP probing (intrusive and spammy), so a true 'domainExists' does not guarantee the mailbox exists.

## Output

Returns a JSON object with: the original email, a syntaxValid boolean, a domainExists boolean (based on MX/A records via DoH), an array of MX record strings, a disposable boolean indicating if the domain is on a community blocklist, a roleAccount boolean indicating if the local part is a role address, and a checkedAt ISO 8601 timestamp.

## 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"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "email"
     ],
     "properties": {
      "email": {
       "type": "string",
       "format": "email",
       "description": "The email address to validate (required)."
      }
     },
     "description": "Query string only."
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "email",
      "syntaxValid",
      "domainExists",
      "mxRecords",
      "disposable",
      "roleAccount",
      "checkedAt"
     ],
     "properties": {
      "email": {
       "type": "string"
      },
      "checkedAt": {
       "type": "string",
       "format": "date-time"
      },
      "mxRecords": {
       "type": "array",
       "items": {
        "type": "string"
       }
      },
      "disposable": {
       "type": "boolean",
       "description": "Domain is on the disposable-email blocklist."
      },
      "roleAccount": {
       "type": "boolean",
       "description": "Local part is a role address (info, support…)."
      },
      "syntaxValid": {
       "type": "boolean"
      },
      "domainExists": {
       "type": "boolean",
       "description": "Best-effort: domain has MX or A records (DoH)."
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "email": "user@example.com",
  "checkedAt": "2026-07-04T00:00:00.000Z",
  "mxRecords": [
   "mx1.example.com"
  ],
  "disposable": false,
  "roleAccount": false,
  "syntaxValid": true,
  "domainExists": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/402utils-email-validation-09269884/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 402utils.com](https://www.zero.xyz/host/402utils.com/llms.txt)