Getting Started

Start with one of two shapes:

1. an indicator that plots a value
2. a strategy that also places trades

1. Build An Indicator

script({ type: 'indicator', priceStudy: true });

const length = input.integer("Length", 14);
const rsiValue = ta.rsi(close, length);

plot(rsiValue, { type: "line", color: "#1D4E89", linewidth: 2 });

This gives you:

• a script header
• a user-editable input
• a calculation
• a plot on the chart

2. Build A Strategy

script({ type: 'strategy', priceStudy: true, orderSize: 1 });

const fastLen = input.integer("Fast Length", 10);
const slowLen = input.integer("Slow Length", 20);

const fast = ta.ema(close, fastLen);
const slow = ta.ema(close, slowLen);

const fastSeries = series(fast);
const slowSeries = series(slow);

if (ta.crossover(fastSeries, slowSeries) && strategy.param_by_id("ema", "position") === 0) {
  strategy.entry({ id: "ema", type: "long" });
}

if (ta.crossunder(fastSeries, slowSeries) && strategy.param_by_id("ema", "position") !== 0) {
  strategy.exit({ id: "ema" });
}

3. Keep The First Version Small

• use one or two inputs
• validate one signal at a time
• plot the key line before adding trade logic
• copy a sample script when you want a known-good pattern

4. Common Failure Modes

• using indicator math directly on raw numbers instead of series values
• forgetting to keep a stable trade id for entry and exit
• mixing legacy $... syntax into a new script
• trying to add too many signals before the first version works

Next Reading

• Platform Settings
• Strategy Authoring