Nostr MCP Server

A Model Context Protocol (MCP) server that provides Nostr capabilities to LLMs like Claude.

https://github.com/user-attachments/assets/1d2d47d0-c61b-44e2-85be-5985d2a81c64

Features

This server implements five tools for interacting with the Nostr network:

1. getProfile: Fetches a user's profile information by public key
2. getKind1Notes: Fetches text notes (kind 1) authored by a user
3. getReceivedZaps: Fetches zaps received by a user, including detailed payment information
4. getSentZaps: Fetches zaps sent by a user, including detailed payment information
5. getAllZaps: Fetches both sent and received zaps for a user, clearly labeled with direction and totals

All tools fully support both hex public keys and npub format, with user-friendly display of Nostr identifiers.

Installation

Connecting to Claude for Desktop

1. Make sure you have Claude for Desktop installed and updated to the latest version.
2. Configure Claude for Desktop by editing or creating the configuration file:For macOS:
   vim ~/Library/Application\ Support/Claude/claude_desktop_config.json
   For Windows:
   notepad %AppData%\Claude\claude_desktop_config.json
3. Add the Nostr server to your configuration:
   { "mcpServers": { "nostr": { "command": "node", "args": [ "/ABSOLUTE/PATH/TO/nostr-mcp-server/build/index.js" ] } } }
   Be sure to replace /ABSOLUTE/PATH/TO/ with the actual path to your project.
4. Restart Claude for Desktop.

Usage in Claude

Once configured, you can ask Claude to use the Nostr tools by making requests like:

• "Show me the profile information for npub1qny3tkh0acurzla8x3zy4nhrjz5zd8ne6dvrjehx9n9hr3lnj08qwuzwc8"
• "What are the recent posts from npub1qny3tkh0acurzla8x3zy4nhrjz5zd8ne6dvrjehx9n9hr3lnj08qwuzwc8?"
• "How many zaps has npub1qny3tkh0acurzla8x3zy4nhrjz5zd8ne6dvrjehx9n9hr3lnj08qwuzwc8 received?"
• "Show me the zaps sent by npub1qny3tkh0acurzla8x3zy4nhrjz5zd8ne6dvrjehx9n9hr3lnj08qwuzwc8"
• "Show me all zaps (both sent and received) for npub1qny3tkh0acurzla8x3zy4nhrjz5zd8ne6dvrjehx9n9hr3lnj08qwuzwc8"

The server automatically handles conversion between npub and hex formats, so you can use either format in your queries. Results are displayed with user-friendly npub identifiers.

Advanced Usage

You can specify custom relays for any query:

• "Show me the profile for npub1qny3tkh0acurzla8x3zy4nhrjz5zd8ne6dvrjehx9n9hr3lnj08qwuzwc8 using relay wss://relay.damus.io"

You can also specify the number of notes or zaps to fetch:

• "Show me the latest 20 notes from npub1qny3tkh0acurzla8x3zy4nhrjz5zd8ne6dvrjehx9n9hr3lnj08qwuzwc8"

For zap queries, you can enable extra validation and debugging:

• "Show me all zaps for npub1qny3tkh0acurzla8x3zy4nhrjz5zd8ne6dvrjehx9n9hr3lnj08qwuzwc8 with validation and debug enabled"

Limitations

• The server has a default 8-second timeout for queries to prevent hanging
• Only public keys in hex format or npub format are supported
• Only a subset of relays is used by default

Implementation Details

• Native support for npub format using NIP-19 encoding/decoding
• NIP-57 compliant zap receipt detection with direction-awareness (sent/received/self)
• Advanced bolt11 invoice parsing with payment amount extraction
• Smart caching system for improved performance with large volumes of zaps
• Total sats calculations for sent/received/self zaps with net balance
• Optional NIP-57 validation for ensuring zap receipt integrity
• Each tool call creates a fresh connection to the relays, ensuring reliable data retrieval

Troubleshooting

• If queries time out, try increasing the QUERY_TIMEOUT value in the source code (currently 8 seconds)
• If no data is found, try specifying different relays that might have the data
• Check Claude's MCP logs for detailed error information

Default Relays

The server uses the following relays by default:

• wss://relay.damus.io
• wss://relay.nostr.band
• wss://relay.primal.net
• wss://nos.lol
• wss://relay.current.fyi
• wss://nostr.bitcoiner.social

Development

To modify or extend this server:

1. Edit the index.ts file in the project root
2. Run npm run build to compile
3. Restart Claude for Desktop to pick up your changes