Charts & data
Charts & candles
How the chart loads candles, pick a pair and timeframe, and read what the chart shows about a run.
Updated 2026-06-29·Rev. 2026.06
The chart in the Builder is your window onto the market and onto a run. It's for seeing — it never computes your strategy logic (that's the engine).
Reading a candle
Each candle summarizes one period of trading as four prices — open, high, low, close (OHLC). The body spans open→close; the thin wick reaches to the high and low. Green means it closed up, red means down.
Most indicators read the close by default — set a node's source to use open, high, or low instead.
Pairs
Pick the instrument from the pair selector. Spera covers Binance spot and USDT-M futures; the chart fetches from the right market based on your selection. Mark favorites for quick access.
Timeframe
Choose the candle size — 1m, 1h, 1d, and so on. The timeframe sets what one candle represents and is part of how your strategy is evaluated, so backtests and bots run on the timeframe you pick here.
How candles load
The chart loads candles by count, not by a fixed time window. You set how many candles to load (more history = more to compute over); the first chunk appears immediately and older candles stream in behind it, so the chart is usable right away.
Tip
Load enough history for your indicators to warm up and for the backtest to be meaningful — but not so much that iteration slows down. There's a performance mode for very large datasets.
What the chart shows about a run
After a backtest, the chart overlays trade markers where entries and exits fired, and can show indicator lines and your drawings. It's the fastest way to see where a strategy acted and whether that matches your intent.