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Substack MCP server

Newsletter & publishing platform — read a publication's posts, archive, and search (public content API). Hosted by 0n3: 3 endpoints your AI can call with your own Substack account, from Claude, ChatGPT, Cursor, Claude Code, Codex or Gemini CLI. One sign-in, one key per AI, a receipt for every call.

Connect SubstackInstall into your AIWatch it work

3 endpoints2 categoriesauth: nonehosted

What your AI can do with Substack

Read posts · List a publication's posts (archive) and fetch a single post by slug2
List postsGET /archive
Get a postGET /posts/{slug}
Search posts · Search posts within a publication1
Search postsGET /post/search

Install in three steps

  1. Create a free account at 0n3.app and connect Substack: 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 posts in Substack.
Install (user scope — every project)
claude mcp add --transport http --scope user 0n3 https://0n3.app/mcp --header "Authorization: Bearer <your 0n token>"

Connect Substack to

Claude Code + SubstackMCP server + skillClaude (desktop & claude.ai) + SubstackconnectorChatGPT + Substackconnector · GPT actionCodex CLI + SubstackMCP serverGemini CLI + SubstackMCP serverCursor + SubstackMCP serverVS Code (Copilot) + SubstackMCP serverWindsurf + SubstackMCP server

Questions

What can an AI do with the Substack MCP server?

3 things: read posts, search posts. Every call runs with your own Substack connection and lands on a receipt.

Do I need to run anything on my computer?

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

Where does my Substack key go?

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