Spacing & Targets

Level i is priced base × (1 − i × spread ÷ 100) for a long grid (and the mirror above the base for a short). The steps are arithmetic, not compounding, so ten levels at 1% reach exactly 10% below the base — which makes coverage trivial to reason about.

• Tighter spread — more fills, more cycles, more fees. Below roughly 4× the round-trip fee the strategy works for the exchange rather than for you.
• Wider spread — fewer but larger cycles, more coverage for the same level count, and long idle stretches where nothing fills.
• Sanity check against volatility: if the instrument's typical hourly range is 0.3%, a 1% spread will fill roughly once a session, not once an hour.

When a rung fills at price p, its exit goes out at p × (1 + target ÷ 100) for a long grid. Because the anchor is the fill price, every level has its own exit and the grid never needs price to return to the base to be profitable.

After an exit fills, the engine wants to restock the level with a fresh limit entry. If price is sitting at (or through) that level, a limit order there is immediately marketable: the exchange would either reject it as post-only or fill it as a taker at a worse price.

The buffer is the extra distance price must move back past the level before the refill is placed. Until then the order is held as an idle order — tracked locally, visible in the terminal's Idle Orders panel, and placed automatically the moment the trigger is crossed.

1. Measure the round-trip fee for your instrument. Multiply by four — that is the floor for target.
2. Look at the chart's typical swing on your intended timeframe. Set spread so a normal swing crosses one to three levels.
3. Start with target = spread, then widen the target if the instrument trends inside its range, or tighten it if it chops.
4. Set buffer to roughly 10–20% of the spread.

• 1.Grid Structure — Levels and coverage
• 2.Reading the Ladder Plan — Seeing the exact exit price of every rung
• 3.Strategy Lifecycle — Which edits rebuild the grid