# x402 Web Tools – Email Domain Check

> x402 Web Tools – Email Domain Check is a paid API for AI agents from x402-web-tools.onrender.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-18).

Checks whether a domain or email address can receive email, identifies the mail provider, and returns deliverability signals including DMARC policy and disposable-address status.

## Facts

- Endpoint: GET https://x402-web-tools.onrender.com/api/email-domain-check?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-web-tools-email-domain-check-529efe4c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UYjNZ9rnp8ow1cInmJSOQ

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 x402-web-tools-email-domain-check-529efe4c
```

Example prompt: Can you check if the domain 'acme.io' can actually receive email, whether it's a disposable address domain, and what its DMARC policy is?

## When to prefer this

Choose this endpoint when you need quick, pay-per-use email domain validation without managing API keys or subscriptions. It is ideal for single-domain lookups during signup flows, lead enrichment pipelines, or pre-send email list hygiene checks where you want provider identification, disposable-address detection, and DMARC policy all in one call.

## Known failure modes

- Invalid or malformed domain/email input returns an error response
- Domain does not exist in DNS — canReceiveEmail returns false with low deliverability score
- DMARC record absent — dmarcPolicy may be null or 'none'
- Payment failure via x402 results in HTTP 402 and no data returned
- Rate limits or upstream DNS timeouts may cause delayed or missing responses

## How this service works

Pay-per-call web tools for AI agents. No API keys: pay per request in USDC on Base via x402.

## Output

Returns a JSON object with the domain name, identified email provider (e.g. Google, Microsoft), a boolean flag indicating if the domain can receive email, whether it is a disposable/throwaway domain, the DMARC policy string (e.g. 'reject', 'quarantine', 'none'), and a numeric deliverability score from 0 to 100.

## 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": [
      "domain"
     ],
     "properties": {
      "domain": {
       "type": "string",
       "description": "Domain or full email address"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "domain": "stripe.com",
  "provider": "Google",
  "disposable": false,
  "dmarcPolicy": "reject",
  "canReceiveEmail": true,
  "deliverabilityScore": 100
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-web-tools-email-domain-check-529efe4c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-web-tools.onrender.com](https://www.zero.xyz/host/x402-web-tools.onrender.com/llms.txt)