MCP server

Endpoint

https://split.xuper.fun/api/mcp

Streamable HTTP, stateless, unauthenticated. There is no rate-limit key to request and no dashboard to sign up for.

Claude

On the web or in the desktop app, open Customize → Connectors, click + → Add custom connector, and paste the endpoint. Leave the OAuth fields empty — there’s nothing to authenticate against.

https://split.xuper.fun/api/mcp

Works on every plan, though the free plan allows a single custom connector. Claude connects from Anthropic’s cloud rather than your device, which is fine here: this endpoint is on the public internet with nothing to allowlist. See Anthropic’s guide if the menu has moved.

ChatGPT

Turn on developer mode first — it lives in settings under the apps/connectors advanced options, and until it’s on there’s no way to add a custom connector at all. Then add a connector and paste the endpoint. When it asks how to authenticate, choose no authentication.

https://split.xuper.fun/api/mcp

OpenAI has moved these settings around more than once, so follow their own instructions for the current menu path and which plans include it.

Claude Code and other clients

From a terminal:

claude mcp add --transport http xupersplit https://split.xuper.fun/api/mcp

Any client that reads an MCP config file:

{
  "mcpServers": {
    "xupersplit": { "url": "https://split.xuper.fun/api/mcp" }
  }
}

Older clients that only speak stdio can bridge with mcp-remote:

{
  "mcpServers": {
    "xupersplit": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "https://split.xuper.fun/api/mcp"]
    }
  }
}

Tools

Refer to people by name — the tools resolve names to participants, and amounts are plain decimals in the split’s currency.

create_split

Start a split and get its secret link back

get_split

Participants, expenses, balances and who should pay whom

add_expense

Record what someone paid — equally, by weight or exact amounts

record_payment

Log a payback between two people

update_entry

Change an existing expense or payment

delete_entry

Remove an expense or payment

add_participant

Add someone to an existing split

rename_participant

Change a participant’s name

remove_participant

Remove someone who isn’t on any expense

set_payment_methods

Swish, IBAN, Revolut, Lightning, USDC and the rest

update_split

Rename the split or set its currency

Receipts and shared items

A split is made of expenses, not receipt lines — so a bill where people shared some things and not others is several expenses, one per group of items the same people shared. Your assistant reads the receipt and does that division; hand it a photo and say who had what.

add_expense  wine 480, split_between: [Alice, Bob, Chen]
add_expense  Alice's main 245, split_between: [Alice]
add_expense  taxi 300, shares: [{Alice, weight: 2}, {Bob, weight: 1}]

split_between divides equally between the people you name. shares takes either a weight each — 2 for a couple — or an exact amount each, which has to add up to the total. It won’t accept a set of amounts that doesn’t, so an agent can’t quietly lose a krona, and cents that don’t divide evenly are settled by largest remainder rather than dropped.

The link is the key

A split lives at an unguessable URL, and holding that URL is what grants access — for people and agents alike. Share it with the group and nobody else. Splits created over MCP are the simple, accountless kind; a secure split (made by a signed-in user, with identity-bound participants) can’t be created or edited here, because this server deliberately has no sign-in. See the privacy policy for what’s stored and for how long, and the terms for what an agent connected here is and isn’t responsible for.

Self-hosting

The endpoint ships with the app, so a self-hosted Xupersplit gets its own MCP server at /api/mcp. The source is on GitHub under the MIT licence.