# OpenVerbs Email Validator

> OpenVerbs Email Validator is a paid API for AI agents from email.openverbs.com, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-14).

Validates an email address for syntax correctness, MX/A DNS deliverability, and detects disposable or role-based addresses without probing the mailbox.

## Facts

- Endpoint: POST https://email.openverbs.com/v1/validate
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/openverbs-email-validator-f9c7a840
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_iw0AJCckCzDmlDyE04KIm

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 openverbs-email-validator-f9c7a840 -d '<json body>'
```

Example prompt: Can you check whether 'john.doe@tempmail.org' is a valid, deliverable email address, and let me know if it looks like a disposable or role-based address?

## When to prefer this

Choose this endpoint when you need lightweight, fast email validation that covers syntax, DNS deliverability, and disposable/role-based detection without performing SMTP mailbox probing. Ideal for registration flows, lead qualification, and list hygiene where privacy-safe, non-intrusive checks are required. Prefer over heavier SMTP-probing validators when speed and non-intrusiveness matter, and over purely syntax-only validators when you need real deliverability signals.

## Known failure modes

- Malformed input email (too short, missing @, invalid format) returns a validation error
- Unknown or unregistered domain may return undeliverable without definitive disposable verdict
- Newly created disposable domains not yet in blocklist may pass detection
- DNS lookup timeouts may cause deliverability check to fail or return inconclusive
- Payment failure (x402) if USDC funds are insufficient

## How this service works

Validate an email address — syntax, MX/A deliverability lookup, and disposable / role-based address detection. No mailbox probing.

## Output

Returns a structured validation result indicating whether the email address has valid syntax, whether the domain has resolvable MX or A DNS records (deliverability), whether the address is from a known disposable email provider, and whether it is a role-based address (e.g. admin@, support@). No SMTP mailbox probing is performed.

## Request schema (JSON Schema)

```json
{
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "type": "object",
 "properties": {
  "input": {
   "type": "object",
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "type": "string",
     "enum": [
      "POST"
     ]
    },
    "bodyType": {
     "type": "string",
     "enum": [
      "json",
      "form-data",
      "text"
     ]
    },
    "body": {
     "type": "object",
     "properties": {
      "email": {
       "type": "string",
       "minLength": 3,
       "maxLength": 254,
       "description": "Email address to validate, e.g. \"user@example.com\"."
      }
     },
     "required": [
      "email"
     ],
     "additionalProperties": false
    }
   },
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "additionalProperties": false
  }
 },
 "required": [
  "input"
 ]
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/openverbs-email-validator-f9c7a840/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from email.openverbs.com](https://www.zero.xyz/host/email.openverbs.com/llms.txt)