# Email Address Validation

> Email Address Validation is a paid API for AI agents from bess-x402.onrender.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-28).

Validates an email address for syntax, domain/MX records, disposable provider, role address, free provider, and typo detection — without sending mail or probing the mailbox.

## Facts

- Endpoint: GET https://bess-x402.onrender.com/v1/web/email-check?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/email-address-validation-f1ae680b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_k2vmTu5hfGFWcqV4LJApE

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 email-address-validation-f1ae680b
```

Example prompt: Before I add john.doe@gmial.com to my mailing list, can you validate it — check the syntax, whether the domain has mail servers, if it's a disposable or role address, and suggest any typo correction?

## When to prefer this

Choose this endpoint when you need a fast, passive email quality check before sending — especially to catch typos, disposable providers, and role addresses without triggering any mail delivery or SMTP probing. Prefer it over SMTP-probing validators when you want zero side effects and don't need mailbox-existence confirmation.

## Known failure modes

- Missing or malformed email parameter returns a validation error
- Domain exists but has no MX records — flagged but not an API error
- Extremely obscure TLDs or new domains may not be in disposable provider lists
- Rate limiting or service unavailability on the hosted Render instance may return 5xx errors
- Unicode/internationalized email addresses may not be fully supported

## How this service works

Check an email address before sending: syntax, whether the domain exists and has mail servers (MX), disposable/temporary provider, role address (info@, sales@), free provider and typo suggestion (gmial.com -> gmail.com), with a verdict. No mail is sent and the mailbox is not probed.

## Output

Returns a structured verdict including: syntax validity, domain existence and MX record presence, whether the address belongs to a known disposable/temporary provider, whether it is a role address (e.g. info@, admin@), whether it uses a free provider (e.g. Gmail, Yahoo), a typo suggestion if the domain looks misspelled, and an overall deliverability verdict — all without sending any email or probing the mailbox.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "email"
     ],
     "properties": {
      "email": {
       "type": "string",
       "description": "Email address"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/email-address-validation-f1ae680b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from bess-x402.onrender.com](https://www.zero.xyz/host/bess-x402.onrender.com/llms.txt)