Prop firms (FTMO-style challenges and funded accounts) have made "prop firm friendly" the most searched phrase in the EA market — and the most abused. The firm doesn't care how an EA enters trades. It cares about a short list of rules, every one of which is measured on equity, not balance. An EA that can't keep equity inside those lines will fail the challenge, however good its backtest looks.
The rules that matter
- Daily loss limit — usually 4–5% of starting balance, measured on equity including floating P&L. One deep grid basket breaks this in an afternoon.
- Maximum overall drawdown — usually 8–12%, sometimes trailing (it follows your high-water mark). Again on equity.
- No martingale / no grid — many firms ban lot-size increases after losses outright; others allow them but the drawdown rule catches them anyway.
- News restrictions — some firms forbid opening trades in a window around high-impact releases; some forbid holding through them.
- Consistency rules — no single day may account for more than X% of total profit. Punishes lucky spikes.
- Weekend holding — often banned on challenges, allowed on funded accounts.
- Minimum trading days — the EA must trade on, say, 5–10 separate days.
Why grid and martingale EAs fail challenges
A grid EA makes money by holding a basket of positions through a move and closing them together in profit. Its drawdown is structural: the basket is underwater by design until the market turns. On a normal account you decide how much floating loss you can stomach. On a prop account the firm has already decided — 5% today, 10% overall — and a Gold grid at any realistic lot size will breach that on a trending day. It isn't a question of settings; it's what the strategy is.
Martingale compounds the problem: each level is bigger, so the basket's floating loss grows faster than linearly. The equity curve looks great for months and then removes the account in one move.
What a passing EA looks like
- One position at a time, or a strictly capped number, so floating loss is bounded.
- A hard stop-loss on every trade — the maximum loss per trade is known before entry.
- Fixed lot or fixed risk-percent sizing that never increases after a loss.
- A built-in daily loss limit that stops trading for the day at a level below the firm's.
- An account drawdown cut-off that disables the EA before the firm's limit is hit.
- A news filter or a spread filter that keeps it out of the release window.
- Weekend flattening if the challenge requires it.
Sizing for a challenge
Risk per trade should be a fraction of the daily limit, not of the account. If the daily limit is 5% and the strategy can lose three times in a row on a bad day, 1% per trade is the ceiling; 0.5% is comfortable. Set the EA's own daily-loss cut-off at 3–3.5% so a spread spike or slippage can't push you over the firm's 5%.
Trailing drawdown rules deserve special care: once you're up 6%, a 10% trailing limit now sits at −4% from your new high. An EA that gives back profits slowly can fail a challenge it was winning.
Where Quantora fits
Quantora Breakout is the one Quantora robot built for this: one Gold position at a time, hard stop on every trade, no lot increase after losses, a Risk Governor with daily loss limit and account drawdown cut-off, a spread filter and weekend flattening. The grid systems (Smart Grid, Quantora EA, BB Grid) are for ordinary accounts sized to their published drawdown — not for challenges.
