# Moving Average Simple Envelope (SMAENVELOPE)

> QuantNexus indicator page for a simple moving average envelope.

**Route**: `/quantnexus/indicators/smaenvelope/`

## What It Does

SMAENVELOPE wraps a simple moving average with upper and lower percentage bands.

## Formula

`Upper = SMA(period) * (1 + perc / 100)` and `Lower = SMA(period) * (1 - perc / 100)`

## Parameters

- `period` - default `30`
- `perc` - default `2.5`

## C++23 API

```cpp
#include <nonabt/indicators/smaenvelope.hpp>
auto smaEnvelope = std::make_unique<nonabt::SMAENVELOPE>(data().close(), 30, 2.5);
```

## Common Usage

- Use it to detect stretched moves around a simple trend baseline.
- Pair it with price crossovers or mean-reversion rules.
- Helpful when you want a clean envelope around a slower average.