---
id: "M:cAlgo.API.Internals.IIndicatorsAccessor.OnBalanceVolume(cAlgo.API.DataSeries)"
kind: "method"
type: "T:cAlgo.API.Internals.IIndicatorsAccessor"
url: "https://help.ctrader.com/ctrader-algo/references/Indicators/IIndicatorsAccessor/OnBalanceVolume/"
---

> Documentation index for agents: https://help.ctrader.com/ctrader-algo/llms.txt · machine index: https://help.ctrader.com/ctrader-algo/api.json

# IIndicatorsAccessor.OnBalanceVolume

Member of [IIndicatorsAccessor](https://help.ctrader.com/ctrader-algo/references/Indicators/IIndicatorsAccessor/index.md).

## OnBalanceVolume(DataSeries source)

The On Balance Volume indicator relates price and volume.

Environments: Desktop supported · CLI supported · Cloud supported.

C#:

```csharp
OnBalanceVolume OnBalanceVolume(DataSeries source)
```

Python:

```python
api.Indicators.OnBalanceVolume(source: DataSeries) -> OnBalanceVolume
```

### Parameters

- `source` (`DataSeries`, Python `DataSeries`): The price source data used for the calculation.

### Returns

`OnBalanceVolume` — On Balance Volume indicator instance

### Examples

C#:

```csharp
var onBalanceVolume = Indicators.OnBalanceVolume(Bars.ClosePrices);
var isRising = onBalanceVolume.Result.Last(1) > onBalanceVolume.Result.Last(2);
Print("On Balance Volume: {0}, rising: {1}", onBalanceVolume.Result.Last(1), isRising);
```

Python:

```python
onBalanceVolume = api.Indicators.OnBalanceVolume(api.Bars.ClosePrices)
isRising = onBalanceVolume.Result.Last(1) > onBalanceVolume.Result.Last(2)
api.Print(f"On Balance Volume: {onBalanceVolume.Result.Last(1)}, rising: {isRising}")
```