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 several tools for interacting with the Nostr network:
getProfile
: Fetches a user's profile information by public keygetKind1Notes
: Fetches text notes (kind 1) authored by a usergetLongFormNotes
: Fetches long-form content (kind 30023) authored by a usergetReceivedZaps
: Fetches zaps received by a user, including detailed payment informationgetSentZaps
: Fetches zaps sent by a user, including detailed payment informationgetAllZaps
: Fetches both sent and received zaps for a user, clearly labeled with direction and totalssearchNips
: Search through Nostr Implementation Possibilities (NIPs) with relevance scoringsendAnonymousZap
: Prepare an anonymous zap to a profile or event, generating a lightning invoice for payment
All tools fully support both hex public keys and npub format, with user-friendly display of Nostr identifiers.
Installation
Connecting to Claude for Desktop
- Make sure you have Claude for Desktop installed and updated to the latest version.
- Configure Claude for Desktop by editing or creating the configuration file:For macOS:For Windows:CopyCopy
- Add the Nostr server to your configuration:Be sure to replaceCopy
/ABSOLUTE/PATH/TO/
with the actual path to your project. - Restart Claude for Desktop.
Connecting to Cursor
- Make sure you have Cursor installed and updated to the latest version.
- Configure Cursor by creating or editing the configuration file:For macOS:For Windows:CopyCopy
- Add the Nostr server to your configuration:Be sure to replaceCopy
/ABSOLUTE/PATH/TO/
with the actual path to your project. - Restart Cursor.
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?"
- "Show me the long-form articles 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"
- "Search for NIPs about zaps"
- "What NIPs are related to long-form content?"
- "Show me NIP-23 with full content"
- "Send an anonymous zap of 100 sats to npub1qny3tkh0acurzla8x3zy4nhrjz5zd8ne6dvrjehx9n9hr3lnj08qwuzwc8"
- "Send 1000 sats to note1abcdef... with a comment saying 'Great post!'"
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 anonymous zaps, you can include optional comments and specify the target type:
- "Send an anonymous zap of 500 sats to note1abcdef... with the comment 'Great post!'"
- "Send 1000 sats anonymously to nevent1qys... using relay wss://relay.damus.io"
For zap queries, you can enable extra validation and debugging:
- "Show me all zaps for npub1qny3tkh0acurzla8x3zy4nhrjz5zd8ne6dvrjehx9n9hr3lnj08qwuzwc8 with validation and debug enabled"
For NIP searches, you can control the number of results and include full content:
- "Search for NIPs about zaps with full content"
- "Show me the top 5 NIPs about relays"
- "What NIPs are related to encryption? Show me 15 results"
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
- Anonymous zap support with lightning invoice generation
- Support for zapping profiles, events (note IDs), and replaceable events (naddr)
- Each tool call creates a fresh connection to the relays, ensuring reliable data retrieval
Anonymous Zaps
The sendAnonymousZap
tool lets users send zaps without revealing their Nostr identity. Key points about anonymous zaps:
- The zap will appear to come from an anonymous user in the recipient's wallet
- The zap follows the NIP-57 protocol but without a sender signature
- The recipient can still receive the payment and any included message
- You can zap profiles (using npub/hex pubkey), specific events (using note/nevent/hex ID), or replaceable events (using naddr)
- The server generates a lightning invoice for payment that you can copy into your Lightning wallet
Examples:
The server fully validates LNURL services according to LNURL-pay (LUD-06) and Lightning Address (LUD-16) specifications, ensuring compatibility with various wallet implementations.
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:
- Edit the relevant file:
index.ts
: Main server and tool registrationnote/note-tools.ts
: Profile and notes functionality (Documentation)zap/zap-tools.ts
: Zap-related functionality (Documentation)nips/nips-tools.ts
: Functions for searching NIPs (Documentation)utils/
: Shared utility functionsconstants.ts
: Global constants and relay configurationsconversion.ts
: Pubkey format conversion utilitiesformatting.ts
: Output formatting helperspool.ts
: Nostr connection pool managementephemeral-relay.ts
: In-memory Nostr relay for testing
- Run
npm run build
to compile - Restart Claude for Desktop or Cursor to pick up your changes
Testing
We've implemented a comprehensive test suite using Jest to test both basic functionality and integration with the Nostr protocol:
The test suite includes:
Unit Tests
basic.test.ts
- Tests simple profile formatting and zap receipt processingprofile-notes-simple.test.ts
- Tests profile and note data structureszap-tools-simple.test.ts
- Tests zap processing and anonymous zap preparation
Integration Tests
integration.test.ts
- Tests interaction with an ephemeral Nostr relay including:- Publishing profile events
- Creating and retrieving text notes
- Publishing zap receipts
- Filtering events
websocket-integration.test.ts
- Tests WebSocket communication with a Nostr relay:- Publishing events over WebSocket
- Subscribing to events with filters
- Managing multiple subscriptions
- Closing subscriptions
- Verifying that events with invalid signatures are rejected
All integration tests use our ephemeral-relay.ts
implementation—a fully functional in-memory Nostr relay that supports the Nostr protocol, allowing for real cryptographic event signing and verification without requiring external network connections. This provides a robust way to test the full Nostr workflow in an isolated environment.
For more details about the test suite, see tests/README.md.
Codebase Organization
The codebase is organized into modules:
- Core server setup in
index.ts
- Specialized functionality in dedicated directories:
- Common utilities in the
utils/
directory
This modular structure makes the codebase more maintainable, reduces duplication, and enables easier feature extensions. For detailed information about each module's features and implementation, see their respective documentation.
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hybrid server
The server is able to function both locally and remotely, depending on the configuration or use case.
A Model Context Protocol server that enables LLMs like Claude to interact with the Nostr social network, allowing for fetching user profiles, text notes, and zap payment information.
- Features
- Installation
- Connecting to Claude for Desktop
- Connecting to Cursor
- Usage in Claude
- Advanced Usage
- Limitations
- Implementation Details
- Anonymous Zaps
- Troubleshooting
- Default Relays
- Development
- Testing
- Codebase Organization
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