Případy použití

{
  "mcpServers": {
    "coldleads": {
      "command": "npx",
      "args": ["-y", "--allow-git=root", "github:anttka4cz/mcp-server-coldleads"],
      "env": { "COLDLEADS_API_KEY": "sk_your_secret_key" }
    }
  }
}

{
  "name": "Cold Leads: bulk-verify a Google Sheet",
  "nodes": [
    {
      "parameters": {},
      "id": "2fbec667-d7ba-567e-90cc-f8f765280c69",
      "name": "Manual Trigger",
      "type": "n8n-nodes-base.manualTrigger",
      "typeVersion": 1,
      "position": [

{
  "email": "{{map the e-mail field of the trigger here}}",
  "timeout_ms": 10000
}

"""Verify a large CSV with the Cold Leads bulk API (Python 3.9+, httpx).

  pip install httpx
  export COLDLEADS_API_KEY=sk_...
  python verify_csv.py leads.csv leads_verified.csv --column email

Addresses are normalised and de-duplicated, sent in jobs of up to 5,000 with at most
5 jobs open at a time, and every job is polled until it is done. The output is the
input CSV plus verify_status, verify_score and verify_reason. Job ids are saved next
to the output file, so a second run resumes the same jobs instead of paying twice.

# pip install httpx
# Drop-in helpers for code written against Hunter's email-verifier and email-finder.
# They call Cold Leads and return Hunter-style fields, plus the raw Cold Leads answer.
import os

import httpx

cold = httpx.Client(
    base_url="https://coldleads.app/api/v1",
    headers={"x-api-key": os.environ["COLDLEADS_API_KEY"]},  # the key goes in a header, never in the URL

Agent (no key)                 Cold Leads                         Human owner              Stripe
     |                              |                                   |                     |
     | POST /api/agent/provision    |                                   |                     |
     | owner_email, agent_id,       |                                   |                     |
     | callback_url (optional)      |                                   |                     |
     |----------------------------->| pending account, disabled key,    |                     |
     |                              | Checkout session (24 h) --------------------------------->|
     |<-----------------------------| checkout_url, session_id,         |                     |
     |                              | claim_token (shown once)          |                     |
     | shows checkout_url --------------------------------------------->|                     |

# Session 1: is the address accepted?
S: 220 mx1.example.com ESMTP
C: EHLO verifier.example.net
S: 250-mx1.example.com
S: 250 SIZE 52428800
C: MAIL FROM:<check@verifier.example.net>
S: 250 2.1.0 Sender OK
C: RCPT TO:<anna@example.com>
S: 250 2.1.5 Recipient OK          <- accepted (a 550 here would mean: rejected)
C: QUIT                            <- no DATA command: nothing is delivered

// HubSpot workflow, Custom code action (Node.js)
// Secret: COLDLEADS_API_KEY (your Cold Leads secret key, sk_...)
// Properties to include in code: email, firstname, lastname, website
// Data outputs (add them in the action): verify_status, verify_reason, suggested_email, find_method (String);
// verify_score, find_confidence (Number); mailbox_checked (Boolean)
const axios = require("axios");

const coldleads = axios.create({
  baseURL: "https://coldleads.app/api/v1",
  headers: { "x-api-key": process.env.COLDLEADS_API_KEY },

# coldleads_tools.py - shared by the CrewAI and LangChain examples (pip install httpx)
import json
import os

import httpx

VERIFY_DESC = (
    "Verify one e-mail address with Cold Leads (costs 1 credit). Returns status valid, risky or invalid, "
    "a score from 0 to 100 and reason codes. The last reason says what was checked: ok means a mail server "
    "accepted the mailbox, smtp_unreachable means the mailbox itself was not checked, catch_all means the "

// Cold Leads custom functions for Google Sheets (Extensions → Apps Script, paste into Code.gs).
// Key: Project Settings → Script Properties → Add script property COLDLEADS_API_KEY = sk_...
const COLDLEADS_API = 'https://coldleads.app/api/v1';
const CACHE_SECONDS = 21600; // 6 hours, the longest CacheService keeps an entry

/**
 * Verifies an e-mail address with Cold Leads. Fills three cells: status, score, last reason code.
 * Costs 1 Cold Leads credit unless the same address was answered from this script's cache.
 *
 * @param {string} email The address, for example A2.