Position sizing should be a setting, not a hope

The fastest way to lose an account is not a bad strategy. It is a good strategy sized wrong. TradeByBar puts a hard ceiling on size at the account level. You set a maximum number of contracts, and every order that touches your account respects it: automated signals, copied trades, and orders you place by hand. There is no side door. If a strategy asks for more than your ceiling allows, the order is clamped down to what you permitted before it ever reaches the broker. Why one ceiling instead of a dozen scattered limits? Because complexity is how risk rules get bypassed. When the cap lives in one place and every order flows through the same gate, you can reason about your worst case in a single number. On top of the account ceiling, each strategy can carry its own smaller size. A conservative strategy might trade one contract while your account allows three. The strategy setting decides intent. The account ceiling decides the absolute limit. The smaller of the two always wins. The point is simple: your maximum exposure is something you choose on purpose, in advance, not something you discover after a rough session. Futures trading involves substantial risk of loss. Risk controls reduce the size of mistakes; they do not remove the possibility of loss.