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ContactLint MCP server

by zksyncer
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ContactLint MCP server

ContactLint is a hosted MCP server that checks email addresses and phone numbers before your agent saves or uses them. It runs at a public URL, so there is nothing to install.

This repository holds the listing files only (this README, server.json and a client config example). The server itself is hosted by ContactLint.

Tools

Tool

Input

What it does

validate_email

email

Checks syntax, MX and A records over DNS-over-HTTPS, known disposable domains, role addresses (admin@, no-reply@) and free providers, and suggests a fix when the domain looks like a typo of a major provider (gmial.com).

validate_emails

emails (1 to 50 addresses)

Same checks as validate_email for up to 50 addresses in one call. Returns one result per address in the same order plus a summary of verdicts.

validate_phone

phone, optional country (ISO 3166-1 alpha-2 default region, for example US)

Parses and validates a phone number: valid and possible flags, line type, region, E.164, national and international formats.

ContactLint does not connect to mail servers (no SMTP probing), so it cannot confirm that a mailbox exists or detect catch-all domains.

initialize and tools/list work without a key, so clients and directory scanners can read the tool list. tools/call needs an API key.

Related MCP server: Email Verifier MCP Server

Configuration

One setting is required:

Name

Required

Description

apiKey

yes

Your ContactLint API key. Get a free key at https://contactlint.com/signup

Send it as an Authorization: Bearer <apiKey> header (an x-api-key header also works).

Example client config (see examples/mcp.json):

{
  "mcpServers": {
    "contactlint": {
      "type": "http",
      "url": "https://contactlint.com/mcp",
      "headers": { "Authorization": "Bearer YOUR_API_KEY" }
    }
  }
}

examples/config-schema.json describes the apiKey setting as JSON Schema, for directories and clients that ask for one.

Billing

  • One check per address or number checked. A validate_emails call with 20 addresses uses 20 checks.

  • Addresses whose DNS lookup fails come back unknown and are not billed.

  • If a key does not have enough checks for a whole validate_emails list, nothing is checked or billed.

  • 100 checks per month are free, no card needed.

  • Credit packs: 5,000 checks for $9, 25,000 for $35, 100,000 for $99.

Free tools

Free browser tools (disposable email checker, phone number validator, disposable domain list) are at https://contactlint.com/tools

License

MIT, see LICENSE.

This server cannot be deployed

Shareable, User-Owned Context BackendPeople, applications, and agents read, write, and coordinate together in one context lake. Reach it over MCP, a CLI, a Python SDK, or REST.fulcradynamics.comAd

Maintenance

ActivityMaintained
ResponsivenessNo issues

Resources

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