# Accum (CUMSUM)

> QuantNexus indicator page for CUMSUM accumulation logic.

**Route**: `/quantnexus/indicators/cumsum/`

## What It Does

CUMSUM accumulates values over time starting from an optional seed. It is a general-purpose cumulative sum helper used in quantitative logic.

## Formula

`CUMSUM = cumulative sum of the chosen input series + optional seed`

## Parameters

- `seed` - default `0`

## C++23 API

```cpp
#include <nonabt/indicators/cumsum.hpp>
auto cumsum = std::make_unique<nonabt::CUMSUM>(data().close(), 0);
```

## Common Usage

- Use CUMSUM to build running totals.
- Combine it with event logic or threshold crossing.
- Useful for cumulative return or volume aggregation workflows.

## Practical Pattern

When used on returns, CUMSUM can approximate a running equity-style curve.