Echo Scripts
Write your own Pulse studies in Echo Script on the web - the editor, what scripts can do, limits and how they run.
Echo Script is the Trade Echo scripting language for your own chart studies. It's a JavaScript-style language: a script exports its settings and a function that runs over the chart's bars. It can also read Trade Echo data, such as GEX, charm, dark pool and flow.
Write a script (web)#
The Echo Script editor beside a Pulse chart
- Open Pulse.
- Open the Echo Script panel from the right-hand strip, or open Indicators and choose New script.
- Write your script. New scripts start from a header line,
// @echo-script v1. Hover a function name to see its docs. - Click Add to chart to run it on the current chart (Ctrl+Enter, or Cmd+Enter on a Mac).
- Click Save.
Under the editor: panes such as Console (errors and run time), Publish and My scripts.
The Echo Script panel lists the scripts on this chart (up to 5) and My scripts (up to 10), with Edit and Delete on each.
The Echo Script panel with scripts on this chart and My scripts
Starting points: the name menu has New script, My scripts and Templates.
When something goes wrong: the console shows the error with its line number. When a run succeeds, it shows how many plots it drew and how long it took.
What a script can do#
- Plots: lines, steps, histograms, areas and markers, plus horizontal lines, fills, background color and bar color.
- Inputs: whole numbers, decimals, on/off switches, colors, price sources, pick lists, timeframes and symbols. Inputs show up in the script's settings, so you can tune it without touching code.
- Other timeframes: read bars from another timeframe, with no look-ahead.
- Drawings: boxes, labels and tables.
- Alerts: an alert condition is checked on our servers at bar close.
- Strategy: long, short and exit signals that you can test on paper.
Limits#
| Limit | Value |
|---|---|
| Saved scripts per member | 10 |
| Versions kept per script | 50 |
| Script size | 64 KB |
| Name | up to 48 characters, and can't use "Official", "Trade Echo" or "Cortex" |
| Description | up to 500 characters |
| Studies and scripts on one chart | 5 (shared slots) |
| Each run | 250 ms of CPU, 32 MB of memory, 10,000 bars, 16 plots |
How scripts run#
Scripts run in a sandbox, an isolated runtime inside your browser. They use only the bars already on your chart. They can't reach the network, and they never place orders.
Who can use it#
Echo Script is included with a paid Trade Echo plan.
Related#
- Scripts gallery: publish a script, or add one someone else wrote
- Indicators and layers: the picker and the built-in studies
Trade Echo docs are for product education only - not financial advice.