---
title: "Money split: allocate an amount into shares with no rounding loss"
method: GET
path: "/v1/num/allocate"
tags: ["deterministic", "no-api-key", "num", "finance", "money", "allocation"]
---

# Money split: allocate an amount into shares with no rounding loss

`GET /v1/num/allocate`

## Request

- Base URL: `https://api.duoleads.com`
- URL: `https://api.duoleads.com/v1/num/allocate`
- Auth: none declared

Money split: split a money amount into shares without losing or inventing a cent. Divide evenly into N parts, or by a list of ratios, and the remainder is distributed one minor unit at a time by a named, deterministic rule — largest-remainder, first-wins or last-wins — so the parts always sum exactly to the original. Uses the ISO 4217 minor-unit exponent of the currency, so zero- and three-decimal currencies work (JPY 0, KWD 3); metals and XXX are rejected.

**Output (`data`):** shares [decimal strings], shares_minor [integers], total (equals amount exactly), currency, minor_units, remainder_distributed, rule.

Deterministic: identical input returns identical output, so the response is served with `Cache-Control: private, max-age=31536000, immutable` (the paying client may cache it indefinitely; shared caches must not, because the response is paid).

Sources: iso-4217 SIX list one 2026-09-17, list three 2026-01-01 (published 2026-09-17, Public data (owner decision 2026-09-29)). Echoed in `meta.sources`.

Price: $0.05 USDC per call (x402, Base). Route contract version 1.0.0. Docs: https://api.duoleads.com/docs#num-allocate

## Query parameters

- `amount` string, required
- `currency` string, required
- `parts` integer
- `ratios` string
- `rule` 'largest-remainder' | 'first' | 'last' | 'round-robin'

## Response `200`

Paid and settled. `data` is route-specific; a route that judges its input returns 200 with `data.valid: false` for a bad value.

- object
  - `ok` unknown, required
  - `route` '/v1/num/allocate', required
  - `version` '1.0.0', required
  - `data` object, required: shares [decimal strings], shares_minor [integers], total (equals amount exactly), currency, minor_units, remainder_distributed, rule.
    - `shares` string[], required
    - `shares_minor` integer[], required
    - `total` string, required
    - `currency` string, required
    - `minor_units` integer, required
    - `remainder_distributed` integer, required
    - `rule` string, required
  - `meta` Meta, required
    - `disclaimer` string, required: Legal short disclaimer, identical on every response.
    - `request_id` string, required: ULID.
    - `computed_at` string, date-time, required: RFC 3339 UTC with milliseconds.
    - `price_usd` string, required: Decimal string, "0.05".
    - `deterministic` boolean, required
    - `sources` object[]: Present only on routes that read a vendored dataset: the exact edition that answered.
      - `id` string, required
      - `version` string, required
      - `published` string, required
      - `attribution` string
      - `licence` string

## Other responses

- `400`: MISSING_PARAM, INVALID_PARAM or UNSUPPORTED_VALUE. Not charged: validation runs before the paywall.
- `402`: Payment required. No valid PAYMENT-SIGNATURE was supplied: read the base64 PAYMENT-REQUIRED header (or this body) for the price ($0.05 = 50000 atomic USDC on eip155:8453), sign an EIP-3009 authorization and retry. Also returned when settlement is declined (PAYMENT_FAILED). Nothing is charged on a 402.
- `404`: NOT_FOUND: unknown path. Not charged.
- `405`: METHOD_NOT_ALLOWED: only GET and HEAD are served. Not charged.
- `413`: INPUT_TOO_LARGE: a parameter exceeded its documented maximum length. Not charged.
- `500`: INTERNAL: a server bug. Not charged.

---

[API](https://skmtc.dev/duoleads/apis/duo-data-utilities-iban-isin-vat-tax-id-barcode-timezone-geo.md) · [All operations](https://skmtc.dev/duoleads/apis/duo-data-utilities-iban-isin-vat-tax-id-barcode-timezone-geo/llms.txt) · [OpenAPI document](https://skmtc.dev/duoleads/apis/duo-data-utilities-iban-isin-vat-tax-id-barcode-timezone-geo/revisions/18790d59615e?raw)