Koskamo

NewsletterFIT MCP

An official MCP server that allows AI agents to search and retrieve data on over 89,000 Substack and beehiiv newsletters, including their sponsors, topics, companies, and people mentioned in posts. It provides read-only access to newsletter profiles, articles, entities, and topics, with limited export capabilities for Enterprise users.

Visit NewsletterFIT

Endpoint and access

OAuth sign-in: the first time you connect, your client opens the vendor's own authorization prompt in a browser.

NewsletterFIT MCP logo, by NewsletterFITVendor evidenceStreamable HTTPOAuth sign-inEndpoint checked 2026-11-01Operated by NewsletterFIT
You need:Use a plan with API access: Pro, Intelligence or Enterprise.Your account needs a confirmed email.Authorization: Bearer nf_live_… API keyOAuth 2.1 sign-in (Claude.ai, ChatGPT)
MCP endpoint (Streamable HTTP)
https://newsletterfit.com/mcp
Vendor documentation

Checks and signals

Each line is separate evidence, not a trust score.

  • Passed Endpoint answered the live check ·
  • Passed Official MCP Registry namespace is tied to newsletterfit.com ·
  • Passed Endpoint is on the registry namespace domain ·
  • Availability 1 of 1 checks passed in 30 days

What you can do with it

  • Search for newsletters by topic, company, or brand
  • Find companies, people, or sponsors mentioned in newsletter posts
  • Retrieve full profiles and publishing activity for specific newsletters
  • List recent articles across tracked newsletters

Source and maintenance

Vendor evidenceRegistry 1.0.0
mcp-registry: com.newsletterfit/mcp@1.0.0Project website

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

90-day uptime

A lightweight connection check about every six hours, sampled on hosts with many listings. It shows the server answered, not that its tools work.

Too few checks for a percentage yet (4 of 4 answered).

  1. 2026-11-02: 3 of 3 checks answered
  2. 2026-11-03: 1 of 1 checks answered

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks
1 of 1 (100%)
Average latency
313 ms
95th percentile latency
313 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · probe · passed · 313 ms · metadata changed · refuses unauthenticated initialize (HTTP 401)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport http newsletterfit-mcp https://newsletterfit.com/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).
Codex configuration
codex mcp add newsletterfit-mcp --url https://newsletterfit.com/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable newsletterfit-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "newsletterfit-mcp": {
      "url": "https://newsletterfit.com/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "newsletterfit-mcp": {
      "type": "streamableHttp",
      "url": "https://newsletterfit.com/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start newsletterfit-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "newsletterfit-mcp": {
      "type": "http",
      "url": "https://newsletterfit.com/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.
Gemini CLI configuration
gemini mcp add --transport http newsletterfit-mcp https://newsletterfit.com/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.
Claude Desktop configuration
{
  "mcpServers": {
    "newsletterfit-mcp": {
      "url": "https://newsletterfit.com/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.
Windsurf configuration
{
  "mcpServers": {
    "newsletterfit-mcp": {
      "serverUrl": "https://newsletterfit.com/mcp"
    }
  }
}

Let your agent find its tools

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Do you run NewsletterFIT MCP?

Prove ownership with a DNS record, a well-known file, or your Official MCP Registry entry, and your edits publish immediately. Proofs are re-checked weekly; admins can still hide or remove a listing.

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