Free email and phone checks

Each tool does one check in the browser, with a limit of 30 requests a minute per network. None of them open a mailbox or look up a carrier. When you need that, the paid API is on the same paths the tools name, paid with USDC on Base. No signup and no API key.

Email domain check

MX, SPF, and DMARC for a domain. Paid follow-up: GET /verify/domain at $0.02.

Disposable email check

Disposable-domain list (CC0 1.0). Only the domain is accepted. Paid follow-up: POST /verify/email at $0.01.

Phone format check

E.164 and country only. Carrier and line type are POST /verify/phone at $0.02.

Real estate list cleaning

Real estate list hygiene. Paid follow-up: POST /verify/email/batch at $0.01 per address.

Ecommerce list cleaning

Ecommerce list hygiene. Paid follow-up: POST /verify/email/batch at $0.01 per address.

SaaS signups list cleaning

SaaS signups list hygiene. Paid follow-up: POST /verify/email/batch at $0.01 per address.

POST /verify/email

$0.01 per mailbox

Paid API

curl -i -X POST "https://verify-x402.okwithit9.workers.dev/verify/email" \
  -H "content-type: application/json" \
  -d '{"email":"ada@example.com"}'

curl -i -X POST "https://verify-x402.okwithit9.workers.dev/verify/email" \
  -H "content-type: application/json" \
  -H "PAYMENT-SIGNATURE: <payment>" \
  -d '{"email":"ada@example.com"}'

x402 and MCP

npx -y https://verify-x402.okwithit9.workers.dev/mcp/contact-verify-mcp.tgz

{
  "mcpServers": {
    "contact-verify": {
      "command": "npx",
      "args": ["-y", "https://verify-x402.okwithit9.workers.dev/mcp/contact-verify-mcp.tgz"],
      "env": {
        "EVM_PRIVATE_KEY": "0xYOUR_BASE_PRIVATE_KEY"
      }
    }
  }
}

MCP tool: verify_email

POST /verify/email/batch

$0.01 per email, up to 50

Paid API

curl -i -X POST "https://verify-x402.okwithit9.workers.dev/verify/email/batch" \
  -H "content-type: application/json" \
  -d '{"emails":["ada@example.com"]}'

curl -i -X POST "https://verify-x402.okwithit9.workers.dev/verify/email/batch" \
  -H "content-type: application/json" \
  -H "PAYMENT-SIGNATURE: <payment>" \
  -d '{"emails":["ada@example.com"]}'

x402 and MCP

npx -y https://verify-x402.okwithit9.workers.dev/mcp/contact-verify-mcp.tgz

{
  "mcpServers": {
    "contact-verify": {
      "command": "npx",
      "args": ["-y", "https://verify-x402.okwithit9.workers.dev/mcp/contact-verify-mcp.tgz"],
      "env": {
        "EVM_PRIVATE_KEY": "0xYOUR_BASE_PRIVATE_KEY"
      }
    }
  }
}

MCP tool: verify_email_batch

POST /verify/phone

$0.02 per number

Paid API

curl -i -X POST "https://verify-x402.okwithit9.workers.dev/verify/phone" \
  -H "content-type: application/json" \
  -d '{"phone":"+14155552671","country":"US"}'

curl -i -X POST "https://verify-x402.okwithit9.workers.dev/verify/phone" \
  -H "content-type: application/json" \
  -H "PAYMENT-SIGNATURE: <payment>" \
  -d '{"phone":"+14155552671","country":"US"}'

x402 and MCP

npx -y https://verify-x402.okwithit9.workers.dev/mcp/contact-verify-mcp.tgz

{
  "mcpServers": {
    "contact-verify": {
      "command": "npx",
      "args": ["-y", "https://verify-x402.okwithit9.workers.dev/mcp/contact-verify-mcp.tgz"],
      "env": {
        "EVM_PRIVATE_KEY": "0xYOUR_BASE_PRIVATE_KEY"
      }
    }
  }
}

MCP tool: lookup_phone

GET /verify/domain

$0.02 per domain

Paid API

curl -i "https://verify-x402.okwithit9.workers.dev/verify/domain?domain=examp1e-billing.com"

curl -i "https://verify-x402.okwithit9.workers.dev/verify/domain?domain=examp1e-billing.com" \
  -H "PAYMENT-SIGNATURE: <payment>"

x402 and MCP

npx -y https://verify-x402.okwithit9.workers.dev/mcp/contact-verify-mcp.tgz

{
  "mcpServers": {
    "contact-verify": {
      "command": "npx",
      "args": ["-y", "https://verify-x402.okwithit9.workers.dev/mcp/contact-verify-mcp.tgz"],
      "env": {
        "EVM_PRIVATE_KEY": "0xYOUR_BASE_PRIVATE_KEY"
      }
    }
  }
}

MCP tool: verify_domain

Questions

Are these checks free?

Yes. Each tool allows 30 requests a minute per IP. They do not open a mailbox and they do not return a carrier or a line type.

How do I check a whole list?

POST /verify/email/batch takes up to 50 addresses at $0.01 each. A request without payment returns HTTP 402. Retry with PAYMENT-SIGNATURE.

Do you store what I type?

No. Email addresses and phone numbers are not written to logs, and the tools do not put them in the URL.