# PaywallWatch Email Verifier

> PaywallWatch Email Verifier is a paid API for AI agents from api.paywallwatch.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-22).

Screens an email address for syntax errors, DNS/MX validity, disposable domains, role accounts, free providers, and common typos — without verifying mailbox existence.

## Facts

- Endpoint: GET https://api.paywallwatch.com/v1/email/verify?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/paywallwatch-email-verifier-609e1fd7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QPYlmFFpuZqQD08NLrWJx

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 paywallwatch-email-verifier-609e1fd7
```

Example prompt: Before we add this lead to the campaign, can you screen the email address john.doe@gmial.com — check if the syntax is right, the domain has MX records, and whether it's disposable or a role account?

## When to prefer this

Use this endpoint when you have an email address from a form submission, web scrape, or CRM and need to determine whether it is worth attempting delivery — particularly when you want to catch disposable domains, role accounts, free providers, and typos cheaply before committing to an outbound send. Prefer this over full mailbox-existence verification when you want a fast, inexpensive pre-filter that does not trigger SMTP handshakes or risk sender reputation issues.

## Known failure modes

- DNS lookup failure returns HTTP 503 and is not charged
- Invalid or missing email query parameter returns a 4xx error
- Temporarily unresolvable domains may return 503
- Malformed email strings may be flagged at syntax stage before DNS is attempted

## How this service works

Use when an agent has an email address from a form, a scrape or a CRM and must decide whether it is worth sending to. Screens the address: syntax, DNS mail exchanger, disposable domain, role account, free provider and common typos. It does not verify that the mailbox exists. A DNS failure answers 503 and is not charged.

## Output

Returns a structured screening result indicating whether the email passes syntax checks, whether the domain has valid MX records, whether the domain is a known disposable provider, whether the address is a role account (e.g. info@, admin@), whether it is from a free provider, and whether there are likely typos. Does not confirm that the mailbox actually exists. DNS failures return a 503 and are not billed.

## 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",
       "description": "The address to screen"
      }
     }
    }
   },
   "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/paywallwatch-email-verifier-609e1fd7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.paywallwatch.com](https://www.zero.xyz/host/api.paywallwatch.com/llms.txt)