Halves

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Split shared costs fairly: who owes whom, in the fewest payments. No account.

Finance & Payments

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https://halves.clawhard.com/mcp

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halves_create_group_link

Use when the user wants a shared place for a group (trip, flat, event) to keep adding expenses and see who owes whom, not just a one-time calculation. Creates a group and returns a link anyone can open without signing up to add and edit expenses. Anyone with the link can edit it, so share it only with the group. Creates a saved page, so only call it when the user wants a shared group. For a one-off answer use halves_settle_up. Example: {"name": "Lisbon trip", "currency": "EUR", "people": ["Ana", "Ben", "Cy"]}.

peoplearray, required

Names (2 to 40).

namestring

Group name, e.g. "Lisbon trip".

currencystring

Main currency, default USD.

expensesarray

Optional starting expenses (up to 50), same shape as the settle tool.

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Tools (2)

halves_create_group_link

Argument	Type	Description
name	string	Group name, e.g. "Lisbon trip".
people*	array	Names (2 to 40).
currency	string	Main currency, default USD.
expenses	array	Optional starting expenses (up to 50), same shape as the settle tool.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "people"
  ],
  "properties": {
    "name": {
      "type": "string",
      "description": "Group name, e.g. \"Lisbon trip\"."
    },
    "people": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Names (2 to 40)."
    },
    "currency": {
      "type": "string",
      "description": "Main currency, default USD."
    },
    "expenses": {
      "type": "array",
      "items": {
        "type": "object"
      },
      "description": "Optional starting expenses (up to 50), same shape as the settle tool."
    }
  }
}

halves_settle_up

Use when the user shares a trip, dinner, household or group expense list and asks who owes whom, how to split costs, or how to settle up. Returns each person's paid, share and net balance, and the smallest set of payments that squares everyone up. Handles equal splits, splits among a subset, exact amounts and payments already made, with correct rounding. Nothing is saved. Example: {"people": ["Ana", "Ben", "Cy"], "expenses": [{"what": "Dinner", "amount": 90, "paid_by": "Ana"}, {"what": "Taxi", "amount": 24, "paid_by": "Ben", "split_between": ["Ben", "Cy"]}]}. Do the arithmetic here instead of by hand.

read-only

Argument	Type	Description
people*	array	Names of everyone in the group (2 to 40, unique).
currency	string	ISO currency code, default USD.
expenses*	array	What was paid.
payments	array	Payments already made between people to settle up.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "people",
    "expenses"
  ],
  "properties": {
    "people": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Names of everyone in the group (2 to 40, unique)."
    },
    "currency": {
      "type": "string",
      "description": "ISO currency code, default USD."
    },
    "expenses": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "amount",
          "paid_by"
        ],
        "properties": {
          "what": {
            "type": "string"
          },
          "exact": {
            "type": "object",
            "description": "Optional exact amount per person (must add up to amount). Overrides split_between.",
            "additionalProperties": {
              "type": "number"
            }
          },
          "amount": {
            "type": "number",
            "description": "Total in normal units, e.g. 45.50"
          },
          "paid_by": {
            "type": "string"
          },
          "split_between": {
            "type": "array",
            "items": {
              "type": "string"
            },
            "description": "Who shared it. Default: everyone, equally."
          }
        }
      },
      "description": "What was paid."
    },
    "payments": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "from",
          "to",
          "amount"
        ],
        "properties": {
          "to": {
            "type": "string"
          },
          "from": {
            "type": "string"
          },
          "amount": {
            "type": "number"
          }
        }
      },
      "description": "Payments already made between people to settle up."
    }
  }
}

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halves_create_group_link

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Try it

halves_create_group_link

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Tools (2)

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