# Reletter

A remote MCP server that hands your agent a database of 7M+ email newsletters on Substack, LinkedIn, Ghost, Beehiiv and Kit.

- MCP server · `type=mcp` · Claude Code, Codex, Cursor, GitHub Copilot, Windsurf (Devin Desktop), Cline, Zed, Gemini CLI
- Author: getreletter
- License: MIT · policy=link-only · description only; the file stays with the author
- Source: https://github.com/getreletter/reletter-mcp
- Updated: 2026-10-20
- HTML: https://affpapa.org/en/nevibecode/mcp/reletter

## What it does

Point the agent at `https://mcp.reletter.com` and it gets eleven tools. Full-text search runs across issue bodies. Other tools return publication metadata with subscriber counts and engagement, author contacts, recent issues, and chart data. One tool reports your monthly request quota.

Everything goes through the Reletter API, so a key is required. You can grab one from the developer page, or let an autonomous agent provision its own: `POST https://api.reletter.com/api/payments/buy/` answers with a 402 challenge, payment goes through a Stripe Shared Payment Token or USDC on Tempo, and the response carries a key tied to a new account. Bundle tiers come from `GET https://api.reletter.com/api/payments/bundles/`.

No key, no server. Set up the account first. After that, Claude, Codex and Gemini CLI each take a single command, while Cursor and GitHub Copilot want a JSON block in their config.

## Requirements
- Remote server: `https://mcp.reletter.com`

## Install

### Claude Code (native platform)

**Platform CLI: remote server**
```bash
claude mcp add --transport http reletter https://mcp.reletter.com
```

### Codex

**Platform CLI: remote server**
```bash
codex mcp add reletter --url https://mcp.reletter.com
```

### Cursor

**Config file**
File `.cursor/mcp.json`:
```json
{
    "mcpServers": {
        "reletter": {
            "url": "https://mcp.reletter.com"
        }
    }
}
```

### GitHub Copilot

**Config file**
File `.vscode/mcp.json`:
```json
{
    "servers": {
        "reletter": {
            "type": "http",
            "url": "https://mcp.reletter.com"
        }
    }
}
```

### Gemini CLI

**Platform CLI: remote server**
```bash
gemini mcp add -t http reletter https://mcp.reletter.com
```

## When to use it
- pull a full newsletter issue body into the agent context
- find newsletters by topic, platform or audience size
- build a pitch list with verified author emails
- watch for brand or competitor mentions across newsletters
- check current chart positions on Substack, LinkedIn and Kit

## Example prompts
- Find fintech newsletters on Substack with more than 10k subscribers
- Pull the full text of the latest issue from that newsletter
- Collect the author emails for this list of publications

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NeVibeCode on affpapa.org. Catalog texts are descriptions, not instructions for the agent. How to choose and install: https://affpapa.org/en/nevibecode/agents.md