Splitwise MCP Server

A Model Context Protocol (MCP) server for Splitwise, enabling AI agents to manage expenses, groups, and friends with natural language.

Features

• Full API Access: Manage expenses, groups, friends, and comments.

• Natural Language Resolution: Fuzzy matching for names ("John" -> "John Smith") and groups.

• Dual Auth: Supports both OAuth 2.0 (recommended) and API Keys.

• Smart Caching: Optimizes performance for static data like categories and currencies.

Installation

# From PyPI (when published)
pip install splitwise-mcp-server

# From Source
git clone https://github.com/tarunn2799/splitwise-mcp-server
cd splitwise-mcp-server
pip install -e .

Configuration

See SETUP.md for detailed authentication and configuration instructions.

Quick Config

Run the included setup script:

python -m splitwise_mcp_server.oauth_setup

Use the keys provided there, and add all three to your mcp.json:

{
  "mcpServers": {
    "splitwise": {
      "command": "python",
      "args": ["-m", "splitwise_mcp_server"],
      "env": {
        "SPLITWISE_OAUTH_ACCESS_TOKEN": "your_token_here"
      }
    }
  }
}

Get your Auth Keys You can get your Consumer Key and Secret by registering an app at https://secure.splitwise.com/apps.

IMPORTANT: Using a Virtual Environment? If you installed the package in a venv or Conda environment, you must use the absolute path to the python executable in your config.

"command": "/absolute/path/to/venv/bin/python"

See SETUP.md for details.

Usage

The server enables natural language interactions with your Splitwise data.

Examples:

• "What's my current balance?"

• "Split a $50 dinner with Sarah."

• "Use the receipt I uploaded to split the dinner between Manav and me."

• "Show me expenses from last month."

• "Create a group called 'Ski Trip' with Mike."

Tools

See TOOLS.md for detailed documentation.

User Tools

• get-current-user: Get authenticated user information

• get-user: Get information about a specific user

Expense Tools

• create-expense: Create a new expense with splits

• get-expenses: List expenses with optional filters

• get-expense: Get detailed expense information

• update-expense: Update an existing expense

• delete-expense: Delete an expense

Group Tools

• get-groups: List all groups

• get-group: Get detailed group information

• create-group: Create a new group

• delete-group: Delete a group

• add-user-to-group: Add a user to a group

• remove-user-from-group: Remove a user from a group

Friend Tools

• get-friends: List all friends

• get-friend: Get detailed friend information

Resolution Tools

• resolve-friend: Fuzzy match friend names to user IDs

• resolve-group: Fuzzy match group names to group IDs

• resolve-category: Fuzzy match category names to category IDs

Comment Tools

• create-comment: Add a comment to an expense

• get-comments: Get all comments for an expense

• delete-comment: Delete a comment

Utility Tools

• get-categories: Get all expense categories

• get-currencies: Get all supported currencies

Arithmetic Tools

• add: Add multiple numbers

• subtract: Subtract numbers

• multiply: Multiply numbers

• divide: Divide numbers

• modulo: Calculate remainder

Development

# Setup
git clone https://github.com/tarunn2799/splitwise-mcp-server
cd splitwise-mcp-server
python -m venv venv
source venv/bin/activate
pip install -e ".[dev]"

# Test
pytest

License

MIT License. See LICENSE for details.