gr-splitwise-mcp

MCP server for Splitwise. Create and manage expenses, splits, and groups directly from Claude — no manual entry.

Tools

Tool	What it does
list_groups	List all your Splitwise groups with IDs
list_group_members	List members of a group with user IDs
create_group	Create a new group and add members
create_expense	Create an expense with per-user splits, date, and notes
update_expense	Update any field on an existing expense
delete_expense	Delete an expense by ID

Setup

1. Get your Splitwise API key

Go to https://secure.splitwise.com/apps, create a new app, and copy the API key.

2. Add to Claude Desktop

{
  "mcpServers": {
    "splitwise": {
      "command": "uvx",
      "args": ["gr-splitwise-mcp"],
      "env": {
        "SPLITWISE_API_KEY": "your-api-key-here"
      }
    }
  }
}

3. Add to Claude Code

claude mcp add splitwise -e SPLITWISE_API_KEY=your-api-key-here -- uvx gr-splitwise-mcp

Usage examples

Create an expense with a custom split:

Create a Splitwise expense for dinner at Zaika, $259.59, in group 97230678.
I paid. Split 75% to me (user 94211279) and 25% to Suhas (user 24465843).
Date: May 2, notes: "Niagara Falls trip dinner"

Create a group:

Create a Splitwise group called "Barcelona Trip 2026", type trip,
and add user 24465843 as a member.

Update an expense date/notes:

Update expense 4451638821 — set date to 2026-03-19 and notes to "Turo car rental booking"

Notes

• Dates are automatically normalized to noon UTC to avoid timezone display issues in the Splitwise app
• All splits must sum exactly to the total cost
• Use list_groups and list_group_members to find IDs before creating expenses