splitwise

name

splitwise

description

Splitwise is an expense-sharing platform that enables users to track shared costs, balances, and repayments across groups, allowing individuals, roommates, and travelers to manage bills, settle debts, and integrate expense data into budgeting or financial workflows. Read and write Splitwise data through One: groups, expenses, friends, comments, users, expense and more, 27 actions with real parameter documentation. Use whenever the user asks to look something up in Splitwise, create or update a record there, or build code against the Splitwise API.

Splitwise through One

Splitwise is an expense-sharing platform that enables users to track shared costs, balances, and repayments across groups, allowing individuals, roommates, and travelers to manage bills, settle debts, and integrate expense data into budgeting or financial workflows.

One exposes Splitwise through four MCP tools. The table below carries real action ids from One's knowledge base, so for a common operation you can skip search and go straight to reading the action's parameters.

How to run an action

1. Find the action in the table below, or call search_one_platform_actions with platform splitwise if it is not listed.
2. Call get_one_action_knowledge with the action id. Do this every time, including for actions in this table. The table gives you the id, not the parameters.
3. Call execute_one_action with parameters copied from that knowledge.

Never guess a parameter name, a body field, or an enum value. The knowledge has the real schema, and a guessed field is either a 400 or a silent write of the wrong thing.

Before you start

Call list_one_integrations once and confirm Splitwise is connected. If it is missing, the user has not connected it: say so and point them at https://app.withone.ai rather than reaching for raw HTTP.

Each connection carries an access field. If it reports {"policy": "methods", "methods": ["GET"]} the agent is read-only here, so plan a read-only answer instead of attempting a write that will be refused.

Before a write

Creates, updates, deletes and sends land on a real Splitwise account and cannot be recalled. State the action and the specific target in one line before the first write in a task, and let the user stop you. Reads need no confirmation.

Actions

Groups

Action	Method	Path	Action id
Get Group Information	GET	/api/v3.0/get_group/{{id}}	conn_mod_def::GLcIN5lDVhg::Ljuv09bHSvK07jPBihku7Q
List Current User Groups	GET	/api/v3.0/get_groups	conn_mod_def::GLcIN5lGwRg::GalrUzSGRH63_BV7a88hfA
Add User to Group	POST	/api/v3.0/add_user_to_group	conn_mod_def::GLcINnstDhg::E-iyQGFaTQ6NrLG6Yj6u5Q
Create Group	POST	/api/v3.0/create_group	conn_mod_def::GLcIN5lV4DA::a66HgQMeRl-5fO2wb4DFSA
Delete Group	POST	/api/v3.0/delete_group/{{id}}	conn_mod_def::GLcIN5kbQGA::-ZsnfiDqQE2wgLwBq2_IbQ
Remove User From Group	POST	/api/v3.0/remove_user_from_group	conn_mod_def::GLcIN9Zo2uA::AoQtMkOYRQ2TNXkeQIbA8g
Restore a Group	POST	/api/v3.0/undelete_group/{{id}}	conn_mod_def::GLcIOGTgYdA::h90kavcIRMSgXh_FWboXYQ

Expenses

Action	Method	Path	Action id
List Expenses	GET	/api/v3.0/get_expenses	conn_mod_def::GLcINfNnuxg::QvqAZeq-RfuVbK6Cd541nA
Create Expense	POST	/api/v3.0/create_expense	conn_mod_def::GLcINTgtHNA::3dBKALn8RoaqolXQhJrxuA
Delete an Expense	POST	/api/v3.0/delete_expense/{{id}}	conn_mod_def::GLcINTcsccg::_61GSMW5QRiHr_BG5cGLIQ
Restore an Expense	POST	/api/v3.0/undelete_expense/{{id}}	conn_mod_def::GLcINcljWkg::GbGU8-w6SsGaV6uBEbgRnQ
Update Expense	POST	/api/v3.0/update_expense/{{id}}	conn_mod_def::GLcINc48dPA::mP6xBYoPTZO1OZ3GrQYHKQ

Friends

Action	Method	Path	Action id
Get Friend Details	GET	/api/v3.0/get_friend/{{id}}	conn_mod_def::GLcINrcgrkg::VwTlIXvoTJSly5Opd40KGA
List Current User's Friends	GET	/api/v3.0/get_friends	conn_mod_def::GLcINrbwtQg::6uKvca47QhOmqlSZLv8g5w
Add a Friend	POST	/api/v3.0/create_friend	conn_mod_def::GLcINc71Ctg::37cZcT3kT22EwABWjFEMMA
Create Friends	POST	/api/v3.0/create_friends	conn_mod_def::GLcINn4rH2A::QoRT6c1LQqWkal1RicDbGg

Comments

Action	Method	Path	Action id
Get Comments	GET	/api/v3.0/get_comments	conn_mod_def::GLcINTdJQMg::2h96EKlHS9iJcKUXYcvOqA
Create Comment	POST	/api/v3.0/create_comment	conn_mod_def::GLcINTdOvwg::aqc8y8hlSNGg8Z9EllomhA
Delete a Comment	POST	/api/v3.0/delete_comment/{{id}}	conn_mod_def::GLcINT1x-Wg::AbAf0d-BRfeIpAQb7oObVQ

Users

Action	Method	Path	Action id
Get User Information	GET	/api/v3.0/get_user/{{id}}	conn_mod_def::GLcIOGaPjLg::4ATrMySCT-SxLsHZLCdG4g
Update a User	POST	/api/v3.0/update_user/{{id}}	conn_mod_def::GLcIOP7UmSg::WTWnOEauSsKr-NYsFFCunQ

Expense

Action	Method	Path	Action id
Get Expense Information	GET	/api/v3.0/get_expense/{{id}}	conn_mod_def::GLcINcfO7wg::Hf0r8D12SHuQVuAKsoCIGA

Friendships

Action	Method	Path	Action id
Delete Friendship	POST	/api/v3.0/delete_friend/{{id}}	conn_mod_def::GLcINn6ALNA::qJduvZvKRtC1YosTHdsf4A

Currencies

Action	Method	Path	Action id
Get Supported Currencies	GET	/api/v3.0/get_currencies	conn_mod_def::GLcIOGSxuIA::mlktA7ZjRTiyJG3KXytQPQ

Categories

Action	Method	Path	Action id
Get Categories	GET	/api/v3.0/get_categories	conn_mod_def::GLcIOGTqLaA::I2MMd1P9R7ujA0HsIa7XWA

Notifications

Action	Method	Path	Action id
Get Notifications	GET	/api/v3.0/get_notifications	conn_mod_def::GLcIOGwh3XA::edzddg5gSY6jaH8KPnXMkQ

CurrentUser

Action	Method	Path	Action id
Get Current User Information	GET	/api/v3.0/get_current_user	conn_mod_def::GLcIOP7r9aA::QMmPduKxTjyIUR1bKp4SnQ

When a call fails

The error comes from Splitwise, not from One. A 400 or 422 means your parameters do not match the schema, so re-read the knowledge and fix the field. A 401 or 403 means the connection needs re-authorizing, which no retry will fix. A 404 means the id is not on this account. A 429 means slow down. Never retry a write more than once: the first attempt may have landed.

Full catalog: https://www.withone.ai/knowledge/splitwise

Integration knowledge by One (withone.ai), licensed under One-Knowledge-1.0. Attribution must be preserved in derivative works.