Lemlist Official

Lemlist

Interact with the Lemlist API to manage campaigns, leads, sequences, schedules, activities, inbox, webhooks, unsubscribes, exports, and enrichment.

Full endpoint reference: references/api-endpoints.md Official API docs: https://developer.lemlist.com/api-reference

Setup

1. Get API key

1. Log in to Lemlist
2. Go to Settings > Integrations > API Keys
3. Create a new key — copy immediately, shown only once

2. Configure in OpenClaw

Add to ~/.openclaw/openclaw.json:

{
  "skills": {
    "entries": {
      "lemlist": {
        "apiKey": "your-lemlist-api-key"
      }
    }
  }
}

Alternative explicit format:

{
  "skills": {
    "entries": {
      "lemlist": {
        "env": {
          "LEMLIST_API_KEY": "your-lemlist-api-key"
        }
      }
    }
  }
}

3. Verify

Run: Get my Lemlist team info

Docker sandbox

Forward the key explicitly:

{
  "agents": {
    "defaults": {
      "sandbox": {
        "docker": {
          "env": ["LEMLIST_API_KEY"]
        }
      }
    }
  }
}

Authentication

Base URL: https://api.lemlist.com/api

Basic Auth with empty username (colon before key is mandatory):

Authorization: Basic base64(:LEMLIST_API_KEY)

Python Helper

Use this pattern for all API calls:

import urllib.request, os, json, base64

API_KEY = os.environ["LEMLIST_API_KEY"]
AUTH = base64.b64encode(f":{API_KEY}".encode()).decode()
BASE = "https://api.lemlist.com/api"

def api(path, method="GET", data=None):
    body = json.dumps(data).encode() if data else None
    req = urllib.request.Request(f"{BASE}{path}", data=body, method=method)
    req.add_header("Authorization", f"Basic {AUTH}")
    req.add_header("User-Agent", "OpenClaw/1.0")
    if data:
        req.add_header("Content-Type", "application/json")
    return json.load(urllib.request.urlopen(req))

Endpoint Summary

For request/response details, read references/api-endpoints.md.

Pagination

Params: offset (default 0), limit (max 100), page (1-based, overrides offset).

Paginated responses include pagination: { totalRecords, currentPage, nextPage, totalPage }. Some older endpoints return a plain array.

ID Prefixes

cam_ campaign, lea_ lead, skd_ schedule, seq_ sequence, tea_ team, usr_ user.

Gotchas

• User-Agent required — set User-Agent: OpenClaw/1.0, Python's default UA is blocked by Cloudflare (403)
• Basic Auth format — empty username mandatory: base64(":key"), not base64("key")
• No campaign deletion — only pause via API
• Email encoding — @ → %40 in URL path params
• Webhook auto-deletion — 404/410 response silently removes the webhook
• No rate limiting — the public API does not throttle
• Variable deletion — DELETE /leads/:id/variables deletes vars, not the lead
• Sync vs async export — /export returns CSV directly, /export/start + poll for large volumes
• Limits — 100 items/page, 200 webhooks/team, 100 API keys/team