Reletter
Reletter MCP

Turn ChatGPT and Claude into a newsletter research tool

Connect your AI assistant to newsletter search, contacts, and issue text. Add one URL and ask questions in plain English.

Connect your AI

Add this URL to any MCP-compatible client. Your AI assistant will handle the rest.

https://mcp.reletter.com

Use cases

Research & outreach

  • “Find finance newsletters with 5k+ subscribers”
  • Pull contact emails and contributor info
  • Build media lists for guest pitching

Monitoring

  • “Has anyone mentioned our brand this week?”
  • Watch for keywords across newsletter issues
  • Track chart movements over time

Audience intelligence

  • “What does the Doomberg audience look like?”
  • Compare two newsletters side by side
  • Search issues for topics, people, products

Quick start

ChatGPT

  1. Settings → Apps → Advanced settings → enable Developer mode
  2. Click Create app
  3. Name: Reletter
  4. MCP server URL: https://mcp.reletter.com
  5. Click Create and paste your API key

Claude.ai

  1. Settings → Connectors
  2. Add custom connector; name Reletter, URL https://mcp.reletter.com
  3. Click Add and paste your API key

Claude Cowork

  1. Open Connectors in your Cowork session
  2. Add custom connector; name Reletter, URL https://mcp.reletter.com
  3. Click Add and paste your API key

Claude Desktop

Add the following to your config file, then restart Claude Desktop:

macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
Windows: %APPDATA%\Claude\claude_desktop_config.json

{
  "mcpServers": {
    "reletter": {
      "url": "https://mcp.reletter.com"
    }
  }
}

Claude Code

Run this in your terminal:

claude mcp add --transport http reletter https://mcp.reletter.com

On first use, Claude Code opens a browser to connect. Paste your API key when prompted. Add --scope user to make it available across all projects.

Cursor

  1. Settings → MCP → Add new MCP server
  2. Type: URL
  3. Enter https://mcp.reletter.com

Available tools

12 tools your AI assistant can call on its own. Just ask a question and it picks the right ones. View on GitHub.

search_publicationsSearch for newsletters by topic, title, or author
search_issuesFull-text search across newsletter issue bodies
autocompleteSuggested keywords and matching newsletters
get_publicationFull metadata for a publication: subscribers, social, rankings
list_issuesRecent issues for a publication
get_issueA single issue with body text
contactsEmail contacts, contact pages, social accounts
chart_categoriesAvailable chart platforms and categories
chart_rankingsLatest chart rankings for a platform / category
list_languagesReference list of languages
index_statsGlobal Reletter index stats
api_quotaYour API request quota and usage

Get started

Grab an API key, add the server URL to your MCP client, and start asking questions.