Substack Newsletter MCP Server

by dancerdan15 Your server? Claim it

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Substack Newsletter MCP is answering right now. Last checked 2 min ago.

Substack newsletter, posts & podcast search

Uptime history 4 days of history

4 days agonow

100.0%

Uptime 24h

92 of 92 checks

—

Tools

hidden behind auth

388 ms

Response time

average over 24h

authentication required

Access

streamable-http

Nothing serious here today

Today is the operative word: we check Substack Newsletter MCP every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 2 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add substack-newsletter-mcp --transport http https://mutualistic-housing--substack-newsletter-mcp.apify.actor/mcp

Settings → Connectors → Add custom connector, then paste this address

https://mutualistic-housing--substack-newsletter-mcp.apify.actor/mcp

~/.codex/config.toml

[mcp_servers.substack-newsletter-mcp]
url = "https://mutualistic-housing--substack-newsletter-mcp.apify.actor/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "substack-newsletter-mcp": {
      "url": "https://mutualistic-housing--substack-newsletter-mcp.apify.actor/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "substack-newsletter-mcp": {
      "type": "http",
      "url": "https://mutualistic-housing--substack-newsletter-mcp.apify.actor/mcp"
    }
  }
}

This endpoint answered with an authorization challenge. The server is running, but it did not say what kind of credentials it expects.

Endpoints

URL	Transport	State	Latency	Checked
https://mutualistic-housing--substack-newsletter-mcp.apify.actor/mcp	streamable-http	needs auth	400 ms	2 min ago

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Substack Newsletter MCP — questions

Answers built from our own checks of this server.

Why is there no tool list for Substack Newsletter MCP?

The server answered our handshake with an authorization challenge, so it is running — but it will not describe its tools to an anonymous client. To see them you need to connect with your own credentials. We record it as alive, not as broken: 100.0% of checks in the last 24 hours got a reply.

Is Substack Newsletter MCP working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 388 ms. The bar chart above shows every period we have measured.

How do I connect Substack Newsletter MCP?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address. You will need your own credentials: it refuses anonymous clients.

Does Substack Newsletter MCP need an API key?

Yes. Every time we knock, Substack Newsletter MCP answers with an authorization challenge instead of its tool list — that is how we know it is running and gated rather than broken. Bring your own credentials and it will talk.

How fast is Substack Newsletter MCP?

It answers our handshake in 388 ms on average, which is faster than 33% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.