> ## Documentation Index
> Fetch the complete documentation index at: https://docs.darvas.app/llms.txt
> Use this file to discover all available pages before exploring further.

# Volume indicators

> ta.vwap, ta.obv, ta.accdist, ta.mfi - volume-based analysis functions.

## `ta.vwap(price, volume)` - Cumulative VWAP

Returns the volume-weighted average price from the first bar of the window to the current bar. Cumulative - it grows with each bar.

```js theme={null}
// overlay = true
plot("VWAP", null, { color: "#f59e0bFF", linewidth: 2 });

onBar(() => {
  plot("VWAP", ta.vwap(ctx.close, ctx.volume));
});
```

<Note>
  `ta.vwap` is cumulative over the entire loaded bar window, not anchored to session open. For session-anchored VWAP, reset manually using a `Series` and `ta.cum`.
</Note>

## `ta.obv(close, volume)` - On-Balance Volume

Running sum: adds volume on up bars, subtracts on down bars. Indicates whether volume is flowing into or out of an asset.

```js theme={null}
// overlay = false
plot("OBV", null, { color: "#22c55eFF" });

onBar(() => {
  plot("OBV", ta.obv(ctx.close, ctx.volume));
});
```

## `ta.accdist(close, high, low, volume)` - Accumulation/Distribution

Weighted cumulative volume indicator. Uses the close location value (CLV) to determine how much of the volume was accumulation vs distribution.

```js theme={null}
plot("A/D", null, { color: "#3b82f6FF" });

onBar(() => {
  plot("A/D", ta.accdist(ctx.close, ctx.high, ctx.low, ctx.volume));
});
```

## `ta.mfi(high, low, close, volume, length)` - Money Flow Index

Bounded 0-100 oscillator that combines price and volume. Often called "volume-weighted RSI". Overbought > 80, oversold \< 20.

```js theme={null}
// overlay = false
hline(80, { color: "#ef4444FF", style: "dashed" });
hline(20, { color: "#22c55eFF", style: "dashed" });
plot("MFI", null, { color: "#a78bfaFF" });

onBar(() => {
  plot("MFI", ta.mfi(ctx.high, ctx.low, ctx.close, ctx.volume, 14));
});
```

## Volume trend analysis

Combining OBV with its own moving average to detect volume divergence:

```js theme={null}
plot("OBV",     null, { color: "#22c55eFF" });
plot("OBV SMA", null, { color: "#22c55e60" });

onBar(() => {
  const obv = ta.obv(ctx.close, ctx.volume);
  const obvSma = ta.sma(() => obv, 20);
  plot("OBV",     obv);
  plot("OBV SMA", obvSma);

  // OBV above its SMA = bullish volume trend
  bgcolor(obv > obvSma ? "#22c55e10" : "#ef444410");
});
```

## Related pages

<CardGroup cols={2}>
  <Card title="Oscillators" href="/ta/oscillators">
    RSI and MACD for non-volume oscillators.
  </Card>

  <Card title="Aggregators" href="/ta/aggregators">
    ta.cum for custom cumulative calculations.
  </Card>

  <Card title="Bar context" href="/essentials/bar-context">
    ctx.volume source function.
  </Card>
</CardGroup>