Grid Bot Fees and Costs

The costs a grid bot pays

A grid earns a small amount per round trip, so small costs matter far more than they do for a trader who holds for weeks. These are the costs, in the order they usually bite.

Fees on every fill

An exchange or broker charges a fee on each filled order, usually a percent of its value. Many charge less for a limit order that waits in the book (a maker order) than for one that takes liquidity (a taker order). The rates vary by venue and often by trading volume, so read your own schedule. A grid mostly places limit orders, but a bot that starts by buying at the market, or closes the grid with a market order, pays the higher rate on those.

Spread

The spread is the gap between the best buy price and the best sell price. A limit order in a grid sits at its own line, so the spread is not charged on every fill. But it is paid when the bot enters with a market order or exits with one. The guide on spread explains the mechanics.

Slippage

Slippage is the difference between the price the bot expected and the price it got. It applies to market orders, especially in fast or thin markets. A stop-out, a grid shutdown or a bot restart often uses market orders, and these are the fills that cost most.

Funding on futures

On perpetual futures, one side pays the other a funding rate at set intervals. A long grid that holds positions pays it when the rate is positive and receives it when it is negative. The rate changes, so funding is a cost that appears when a grid is stuck holding positions for a long time, which is exactly when the grid is losing anyway.

Idle capital

Money held back for buy orders that have not filled earns nothing while it waits. If the market stays above the buy lines, that money sits idle. In a made-up example with 1000 in the bot and 40 percent of it waiting in unfilled buy orders, 400 is doing nothing at that moment. Whether that matters depends on what else the money could do, which this site does not advise on.

The arithmetic that matters

This is a simplification: the sell fee is charged on a slightly higher price, so the exact figure is spacing minus twice the fee minus spacing times fee, a difference of at most 0.0020 percentage points in the table below. The tables use the simple version. Every figure is calculated by us on 27 Oct 2026, exact for that formula.

The highlighted rows lose money or earn nothing for at least one fee level. A 0.2 percent spacing earns nothing at a fee of 0.1 percent per side and loses at 0.2 percent per side. At a fee of 0.1 percent per side, the break-even spacing is 0.2 percent, and anything under that loses on each cycle. The break-even calculator works the same idea for a single trade.

Money terms

The same table on a made-up $100 per grid. In each cell: net per completed grid, then in brackets the total over 50 completed cycles of that grid.

A negative cell is a loss after every completed cycle. The bot is doing exactly what it was set up to do, and it is losing, because the cost of each cycle is larger than the gap it harvests. More cycles make it worse, not better. This is why a narrow grid with a very high number of grids can look busy and lose.

Why narrow grids can lose on every cycle

People choose many grids because it feels like more chances to earn. More grids means a smaller spacing for the same range. Halve the spacing and the gross profit per cycle halves, but the fee on each fill stays the same percent. At some point the spacing falls under the round trip fee and the bot's busiest setting is its most expensive. The table shows the break-even edge: for each fee level, a spacing equal to twice the fee earns zero.

The reverse is not automatically good either. A wide spacing earns more per cycle but needs a bigger price swing to complete one, so it completes fewer. The right balance depends on how far the asset actually moves, which no one knows in advance. See grid trading strategy for how those choices trade off.

Tax, in one sentence

How profits from automated trading are taxed varies by country and by your circumstances, and many small trades can mean a lot of records, so ask a qualified accountant.

How to check the costs of a grid honestly

• Write down the fee rate for the order type the bot really uses, not the lowest rate advertised.
• Compute spacing as a percent of price at the lowest and the highest line, since arithmetic grids have a different percent at each end.
• Subtract twice the fee. If the result is zero or negative, change the setup before looking at anything else.
• Add funding for the longest time the bot could be stuck holding, not only the typical time.
• Run the whole setup through the grid calculator and compare the profit per grid with what a backtest says after costs.