# Dual axis currency labels (Mixed example)

> WestCoast Charts 1.1.5, release, public Core release, on npm. HTML: https://westcoast-charts.com/gallery/mixed/dual-axis-currency-labels/ · Index for agents: https://westcoast-charts.com/llms.txt

Euro and US-dollar axes with compact currency labels.

- Chart type: `line` (Line)
- Collection: Mixed · Mixed / combo
- Raw configuration: https://westcoast-charts.com/gallery-src/mixed/dual-axis-currency-labels.js
- Standalone example: https://westcoast-charts.com/embed/samples/wcc/gallery/mixed/dual-axis-currency-labels.html

## Setup

```js
import WestCoastCharts from 'west-coast-charts'
import types from 'west-coast-charts/types'

WestCoastCharts.use(types)
```

## Options

```js
const options = {
  chart: {
    height: 380,
    fontFamily: "Inter, Geist, \"IBM Plex Sans\", system-ui, sans-serif",
    type: "line",
    toolbar: {
      show: false
    }
  },
  series: [
    {
      name: "EU revenue",
      type: "column",
      data: [3163049, 2954905, 2677562, 3179511, 2438222, 2192909, 2027017, 1283402]
    },
    {
      name: "US revenue",
      type: "line",
      data: [1113266, 1866497, 1422396, 1410777, 2138920, 2029703, 2415855, 2464698]
    }
  ],
  stroke: {
    width: [0, 3]
  },
  xaxis: {
    categories: ["Q1 25", "Q2 25", "Q3 25", "Q4 25", "Q1 26", "Q2 26", "Q3 26", "Q4 26"]
  },
  yaxis: [
    {
      labels: {
        formatter: (v) => ((v) => { if (v == null || isNaN(v)) return '–'; const a = Math.abs(v), s = v < 0 ? '\u2212' : ''; if (a >= 1e9) return s + '€' + (Math.round(a / 1e8) / 10) + 'B'; if (a >= 1e6) return s + '€' + (Math.round(a / 1e5) / 10) + 'M'; if (a >= 1e4) return s + '€' + (Math.round(a / 100) / 10) + 'k'; return s + '€' + Math.round(a).toLocaleString('en'); })(v)
      },
      title: {
        text: "EUR"
      }
    },
    {
      opposite: true,
      labels: {
        formatter: (v) => '$' + (Math.round((v / 1e6) * 10) / 10) + 'M'
      },
      title: {
        text: "USD"
      }
    }
  ],
  tooltip: {
    y: {
      formatter: (v, o) => (o.seriesIndex ? '$' + v.toLocaleString('en') : ((v) => { if (v == null || isNaN(v)) return '–'; const a = Math.abs(v), s = v < 0 ? '\u2212' : ''; if (a >= 1e9) return s + '€' + (Math.round(a / 1e8) / 10) + 'B'; if (a >= 1e6) return s + '€' + (Math.round(a / 1e5) / 10) + 'M'; if (a >= 1e4) return s + '€' + (Math.round(a / 100) / 10) + 'k'; return s + '€' + Math.round(a).toLocaleString('en'); })(v))
    }
  },
  title: {
    text: "Revenue by market"
  },
  theme: {
    mode: "light",
    preset: "coastal"
  }
}

const chart = new WestCoastCharts(document.querySelector('#chart'), options)
await chart.render()
```

## Verify

- Text check (Library 1.1.5): load `west-coast-charts/agent/describe` and call `chart.describe({ format: "json" })` for the actual drawn state. The live reader is on this example’s HTML page.
- Command line (Public agent tools 0.2.3, tested with Library 1.1.5; available from the versioned GitHub release and npm, https://westcoast-charts.com/docs/cli/index.md): `wcc chart export mixed-dual-axis-currency-labels.json --out mixed-dual-axis-currency-labels.svg --with-table` (save the options above as JSON first)