Prop Firm Rules vs Bot Types

How to read the matrix

A prop firm challenge is a short test with fixed rules. A trading bot is a fixed rule set too, with its own sizing and its own way of losing. Where the two sets of arithmetic fit, the bot has room. Where they cross, the attempt ends. The matrix below gives one of three verdicts for each pair, plus "varies" for the rules that depend on wording.

• Usually clear. The bot's own arithmetic fits inside the rule with room, if it is set up with the rule in mind.
• Tight. It can fit, but a normal bad run, a gap or the costs use up the room.
• Breaks by construction. The bot's design contains the thing the rule limits, so the rule ends the attempt in the ordinary course of the bot's own method.
• Varies. The result depends on the exact words of the firm's terms.

These are readings of arithmetic, not statements about any firm. They are a way to ask better questions, and they assume a generic rule of each type. The rule set you face may be stricter, looser or worded differently.

The matrix: rule types against bot types

The bot types are explained on the pages for martingale, grid trading and DCA bots. A scalper takes many small trades with short holds. A news trader enters around scheduled releases. A fixed-risk single trade bot risks a set share of the account on each trade with a stop and a target.

The reason behind each cell

Every verdict comes from the bot's own arithmetic. Here they are by rule, so you can see why.

Profit target

• Fixed-risk single trade (usually clear). Each trade has a known risk and payoff, so the target is a count of average results, if the odds are positive.
• Grid (tight). Gains are small and steady per cycle, so the target needs many cycles, and one trend can erase them.
• Martingale (tight). Each win only recovers the ladder plus one base unit, so the target is reached in small steps.
• DCA (tight). It is built for a long horizon, so a fixed window may end before the average price pays off.
• Scalper (tight). Gains per trade are tiny and costs take a large share of each, so the net per trade is thin.
• News trader (tight). Profit arrives in a few large moves, so a time limit leaves few chances to reach it.

Daily loss limit

• Fixed-risk single trade (usually clear). Loss per trade is capped, so a breach needs several losses in one day. Check the count against the limit.
• Grid (tight). Open levels add up, and if open losses count the floating total can touch the limit on one trend.
• Martingale (breaks by construction). Risk doubles each step, so three losses in a row at a 1 percent base is 7 percent, above a 5 percent limit.
• DCA (tight). Buys keep arriving as price falls, so the unrealised loss grows while the plan says to wait.
• Scalper (usually clear). Stops are small, so a breach needs many losses in a row, but costs add up on busy days.
• News trader (tight). A gap or a fast move can fill a stop beyond its level, so the loss can exceed the planned risk.

Maximum loss limit

• Fixed-risk single trade (usually clear). The worst planned loss is the stop size times the number of losses, which can be compared with the limit.
• Grid (tight). The deepest point of a grid is far below the start and rarely sized to the limit.
• Martingale (breaks by construction). The ladder is built so that its last step is the largest, and a long losing run reaches any fixed limit.
• DCA (tight). Averaging down lowers the average price while it deepens the open loss toward the floor.
• Scalper (usually clear). Many small stops keep the drawdown shallow if the edge after costs is not negative.
• News trader (tight). One event with slippage can take a large share of the limit in a single trade.

Trailing versus static drawdown

• Fixed-risk single trade (usually clear). Under a trailing limit the room stays the same size after gains, and fixed-money risk leaves it unchanged.
• Grid (tight). Profits from closed cycles raise the floor, while the deepest levels stay the same distance away.
• Martingale (breaks by construction). Step sizes grow but trailing room does not, so fewer steps fit once a profit has raised the floor.
• DCA (tight). Positions keep their size while the floor rises, so the same dip uses more of the room.
• Scalper (usually clear). Small stops fit into the room, but the room is measured against costs paid on every trade.
• News trader (tight). A win raises the floor, and the next event, with its wider stop, has less room.

Minimum trading days

• Fixed-risk single trade (usually clear). It trades on any day with a setup, so the count is met unless it waits for rare signals.
• Grid (usually clear). A grid usually places orders every day, so the day count is met if open orders count as a trading day.
• Martingale (usually clear). It trades often, though it can hit the target early and stop before enough days have passed.
• DCA (usually clear). Buys on a schedule, but whether a buy counts as a trading day depends on the wording.
• Scalper (usually clear). Trades most days, so the count is met with room to spare.
• News trader (tight). It trades around scheduled events only, so there may be too few days with a trade.

Consistency rule

• Fixed-risk single trade (usually clear). Profit is spread over many trades of similar size, so no single trade dominates.
• Grid (tight). Profit arrives when a cycle closes, which makes some days large and many days empty.
• Martingale (tight). The win after a long run recovers the ladder, so one result can dominate total profit.
• DCA (tight). Gains show up when the position is sold, which can leave one large day at the end.
• Scalper (usually clear). Many similar small results are the pattern the rule favours.
• News trader (tight). One event day can supply most of the month, which is what the rule limits.

News or weekend restrictions

• Fixed-risk single trade (usually clear). Positions can be closed before the window, and the rule costs only the trades in it.
• Grid (tight). Open levels sit through the close, so a weekend gap can fill several at once.
• Martingale (tight). The ladder is open through the close, and a gap can skip a step and enlarge the loss.
• DCA (tight). Holds are long by design, so closing before every window changes the plan itself.
• Scalper (usually clear). Trades are held for minutes, so it can sit out the window with little change.
• News trader (breaks by construction). The edge of the bot is trading around releases, so a ban on them removes the strategy.

Limits on automation or copying

• Fixed-risk single trade (varies). A bot with a stated risk and no overlap is a design question, so read what the terms name.
• Grid (varies). Some terms name grids or averaging directly, so read for those words.
• Martingale (varies). Some terms name martingale or ladders, and if yours does, the design fails before any trade.
• DCA (varies). Scheduled buys are an ordinary automation, but the wording on averaging may apply.
• Scalper (tight). Terms on holding time, latency or trade count bear on it more than on slower bots.
• News trader (varies). Terms on trading around events often sit beside the automation terms, so read both.

Worked example: the same odds, two sizing rules

The simulation uses made-up odds: a 45 percent win rate and a payoff of 1.5, so a win gains 1.5 times what a loss costs. That has a small positive expected value of 0.125 per unit risked, which is why a fixed-risk bot can pass. It is not a claim about any real strategy. Every attempt is 30 days of 3 trades a day with a 10 percent profit target, a 5 percent daily loss limit measured from the day's starting balance and a 10 percent total loss limit measured from the start. Both strategies see the same sequence of random numbers. The first risks 1 percent of the starting balance on every trade. The second starts at 1 percent and doubles the risk after each loss, then returns to 1 percent after a win. A trade that crosses a limit ends the attempt, and the total limit is checked first.

The ladder's problem is not the average trade, which has the same odds. It is the tail. Three losses in a row at a 1 percent base cost 7 percent, more than the 5 percent daily limit, and the chance of that sequence is 0.55 x 0.55 x 0.55 = 16.6 percent each time a ladder starts. With three trades a day, that comes up often. The fixed-risk run had no daily fails because it takes five straight losses to cost 5 percent, and with three trades a day that cannot happen inside one day. Its failures are slow ones: 242 total-limit fails and 367 timeouts, where the target was not reached in 30 days.

The ladder has no timeouts, because it either gains quickly or fails quickly. That is the shape a ladder makes: many small wins, then a large loss that decides the attempt. The prop firm challenge simulator lets you try your own odds and risk. The code that makes these numbers is in this page's source, and rerunning it gives the same figures.

What the matrix does not tell you

It does not say a bot passes, and it does not say a bot is allowed. A fixed-risk bot can still fail on bad odds. Firms differ, their rules change, and the wording of one clause can turn a "usually clear" into a "breaks". Read your own firm's current terms in full, and measure a bot against those, not against this page. For the arithmetic of the limits themselves see prop firm drawdown rules, and for the cost side see the fee calculator.