---
title: "Delta between two dates (Essential+)"
method: GET
path: "/indices/{code}/fluctuation"
tags: ["Indices", "Series"]
---

# Delta between two dates (Essential+)

`GET /indices/{code}/fluctuation`

## Request

- Base URL: `https://opnplatform.com/api`
- URL: `https://opnplatform.com/api/indices/{code}/fluctuation`
- Auth: HTTP bearer

Start/end as-of values plus absolute and percent change — answers "how much has this index moved since X?". Requires Essential plan or above. `start` is clamped to plan depth.

## Path parameters

- `code` string, required

## Query parameters

- `start` string, date
- `end` string, date

## Response `200`

Fluctuation

- object
  - `change_abs` number
  - `change_pct` number
  - `end` object
  - `start` object

## Other responses

- `403`: Essential plan required

---

[API](https://skmtc.dev/opnplatform/apis/packindex-packiq-api-open-packaging-network.md) · [All operations](https://skmtc.dev/opnplatform/apis/packindex-packiq-api-open-packaging-network/llms.txt) · [OpenAPI document](https://skmtc.dev/opnplatform/apis/packindex-packiq-api-open-packaging-network/revisions/f427c0467bb2?raw)