0n3
MCP servers · cold email

Lemlist MCP server

Cold email outreach — campaigns, leads, sequences, email warmup. Hosted by 0n3: 7 endpoints your AI can call with your own Lemlist account, from Claude, ChatGPT, Cursor, Claude Code, Codex or Gemini CLI. One sign-in, one key per AI, a receipt for every call.

Connect LemlistInstall into your AIWatch it work

7 endpoints4 categoriesauth: api_keyhosted

What your AI can do with Lemlist

Campaigns · Manage outreach campaigns5
List campaignsGET /campaigns
Get a campaignGET /campaigns/{campaignId}
Add a leadPOST /campaigns/{campaignId}/leads/{email}
List leadsGET /campaigns/{campaignId}/leads
Delete a leadDELETE /campaigns/{campaignId}/leads/{email}
Activities · Track email activities1
List activitiesGET /activities
Leads · Manage campaign leads0
Manage campaign leads
More · Everything else this app exposes.1
Get a teamGET /team

Install in three steps

  1. Create a free account at 0n3.app and connect Lemlist: paste a key or sign in through a door. It lands in your vault, encrypted.
  2. Open 0n3.app/install, pick your AI. A key is made for that AI alone; copy the line it gives you.
  3. Ask your AI: whoami. It answers with your connected services. Then ask it to list campaigns in Lemlist.
Install (user scope — every project)
claude mcp add --transport http --scope user 0n3 https://0n3.app/mcp --header "Authorization: Bearer <your 0n token>"

Connect Lemlist to

Claude Code + LemlistMCP server + skillClaude (desktop & claude.ai) + LemlistconnectorChatGPT + Lemlistconnector · GPT actionCodex CLI + LemlistMCP serverGemini CLI + LemlistMCP serverCursor + LemlistMCP serverVS Code (Copilot) + LemlistMCP serverWindsurf + LemlistMCP server

Questions

What can an AI do with the Lemlist MCP server?

7 things: campaigns, activities, leads, more. Every call runs with your own Lemlist connection and lands on a receipt.

Do I need to run anything on my computer?

No. 0n3 is hosted. Connect Lemlist once, install 0n3 into your AI with one line, done.

Where does my Lemlist key go?

Into your 0n3 vault, encrypted, one record per connection. The AI never sees it.