FrostyVerify MCP Server

Verify emails from any MCP client (Claude Desktop, Claude Code, Cursor, etc.) using your FrostyVerify account.

Setup

1. Create an API key at https://frostyverify.com/api-keys
2. Add the server to your MCP client config:

{
  "mcpServers": {
    "frostyverify": {
      "command": "npx",
      "args": ["-y", "frostyverify-mcp"],
      "env": { "FROSTYVERIFY_API_KEY": "fv_live_your_key" }
    }
  }
}

Optional: set FROSTYVERIFY_BASE_URL to point at a different environment (defaults to https://frostyverify.com/api/v1).

Connect in Claude Code with one command:

claude mcp add --env FROSTYVERIFY_API_KEY=fv_live_your_key --transport stdio frostyverify -- npx -y frostyverify-mcp

Then just say: "verify leads.csv, give me the safe ones, then score the catch-alls."

Tools

| Tool | What it does | |------|--------------| | verify_email | Verify one address, returns its category (1 credit). | | verify_bulk | Submit up to 50,000 emails, returns a job_id. | | verify_catchall | Score catch-all / accept-all addresses (separate catch-all credits), returns a job_id. | | get_job | Poll a job: live counts while running, final summary + CSV link when done. |

Run locally (dev)

cd mcp
npm install
FROSTYVERIFY_API_KEY=fv_live_your_key node index.mjs

Categories

Email: safe, role, catch_all, disposable, inbox_full, spam_trap, disabled, invalid, unknown ("safe to send" = safe + role). Catch-all: safe, risky, invalid.