# agentsvc.io Email Verification

> agentsvc.io Email Verification is a paid API for AI agents from agentsvc.io, paid per call via x402, $0.0025/call, status unknown (last checked 2026-10-10).

Verifies whether an email address is deliverable by performing SMTP mailbox probing (RCPT TO) and MX record checks without sending any email.

## Facts

- Endpoint: POST https://agentsvc.io/api/v1/proxy/email-verify?utm_source=zero.xyz
- Price: $0.0025/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentsvc-io-email-verification-8de3312a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4iAOoH_PZt6wNgpsAYZHY

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 agentsvc-io-email-verification-8de3312a -d '<json body>'
```

Example prompt: Can you check whether support@github.com is a real, deliverable email address — I need to know if it exists, whether it's a role address, and if the domain uses a catch-all?

## When to prefer this

Choose this endpoint when you need lightweight, per-address email deliverability checks without sending any actual email. It is ideal for pre-send validation, signup form verification, or list hygiene tasks where you need SMTP-level confirmation (not just format checking) and want to detect disposable, role, or catch-all addresses. It is pay-per-call with no account required, making it suitable for sporadic or agent-driven verification workflows on Base/USDC.

## Known failure modes

- Invalid email format returns format_valid:false and likely undeliverable status
- Domain has no MX records — returns undeliverable with no mx_records
- SMTP server times out or refuses connection — may return inconclusive or error status
- Catch-all domains absorb all RCPT TO probes so deliverability can't be confirmed (is_catch_all:true)
- Greylisting or aggressive spam filters may cause temporary failures
- Payment failure via x402 prevents the call from completing

## How this service works

86 APIs for AI agents: web scraping and crawling to Markdown, AI summaries, data extraction and cited answers, screenshots and PDF, PDF, OCR and document conversion, news, paper and developer search and more, paid per call with USDC on Base, Solana, Polygon or Arbitrum via x402. No account, no API key, free sample on every service.

## Output

Returns a JSON object with: overall deliverability status ('deliverable', 'undeliverable', etc.), SMTP handshake details (MX hostname, SMTP code and message, catch-all probe code), format validity, disposable provider flag, role address flag (e.g. support@, info@), free provider flag, list of MX records, and a timestamp of when the check was performed. No email is actually sent during the check.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "email": {
   "type": "string",
   "format": "email",
   "description": "Email address to verify"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": {
   "note": "SMTP mailbox probe (RCPT TO). No email was sent.",
   "smtp": {
    "mx": "github-com.mail.protection.outlook.com",
    "code": 250,
    "message": "2.1.5 Recipient OK",
    "catch_all_code": 452
   },
   "email": "support@github.com",
   "domain": "github.com",
   "reason": "mailbox_exists",
   "status": "deliverable",
   "checked_at": "2026-10-06T16:05:40.287Z",
   "mx_records": [
    "github-com.mail.protection.outlook.com"
   ],
   "deliverable": true,
   "format_valid": true,
   "is_catch_all": null,
   "is_disposable": false,
   "is_role_address": true,
   "is_free_provider": false
  },
  "success": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentsvc-io-email-verification-8de3312a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentsvc.io](https://www.zero.xyz/host/agentsvc.io/llms.txt)