A 5-minute “Bitcoin up or down” market asks one question: will the BTC price at the end of the window be no lower than at its start? The answer, Up or Down, is known five minutes later, and the position closes at $1 or $0 straight away. These are the fastest markets on Prop Hub, which makes them the easiest place both to make money and to close an account. Here is how they work, step by step.
What a window is
Polymarket runs these markets in series: one window after another, five minutes each. Besides 5-minute windows there are 15-minute, hourly and daily ones, for BTC, ETH, SOL, XRP and other coins. Each window starts at a set moment, and the Bitcoin price at that moment becomes the Target, the level the closing price is compared with.
On a Prop Hub market page you see a live price chart, the Target line and the time left in the window. Above the chart there’s a strip of neighbouring windows: recent results, the current window and upcoming ones.
Who decides the result
Polymarket decides the result using the Chainlink price, the same source it uses to resolve these markets. On short windows it doesn’t use a single tick but a price averaged over the last seconds (TWAP), so one sharp trade on an exchange can’t decide a window. The chart on Prop Hub shows the same price Polymarket sees.
Under the market rules, if the price at the end of the window is not lower than at the start, the result is Up. Otherwise it’s Down. A tie to the cent counts as Up.
Once Polymarket resolves the market, Prop Hub closes positions automatically, usually within a couple of minutes: a share of the outcome that happened is worth $1, the other side $0. More on markets in the help center: Available markets.
What entry costs
At the start of a window Up and Down usually trade near 50¢: the market doesn’t know yet where the price will go. After that the outcome price follows the chart. If BTC is $80 above the Target two minutes in, Up may cost 80¢ or more. A minute before the end, with a clear gap, prices often move to 95¢ and beyond.
That gives you simple arithmetic.
- Buying Up at 50¢ at the start of a window risks the full amount to double it. It’s a directional trade.
- Buying Up at 92¢ a minute before the end risks 92¢ to make 8¢. One move against you wipes out the profit of ten such trades.
Fees
Polymarket charges higher fees on crypto markets than on sports or politics, and Prop Hub deducts exactly the same from the virtual balance. As a share of the trade it equals the market’s fee rate × (1 − price), so it’s largest on cheap outcomes. Frequent trades at 50¢ pay the fee every time, and you need to build it into your numbers. Formula and examples: Fees and execution.
Order book
A buy fills against sellers’ offers from the best price down, and the trade price is the weighted average. In the last seconds of a window the book often thins out and a large order won’t fill in full. There’s no partial fill: if there isn’t enough volume, the order is rejected and you need to reduce the amount. More in the order book and slippage.
A streak predicts nothing
The strip of windows shows how the last ones ended, say five Ups in a row. The temptation is obvious: “the market is rising, I’ll take Up again” or “five in a row, it has to be Down now”. Neither is based on data. Each window compares the price with its own start: if BTC has climbed all morning, the next window simply starts from a new, higher point. A streak describes the past, not the next five minutes.
If you have a directional view, it has to rest on something else: exchange volume, a news item, a level the price is approaching, how BTC behaves ahead of a macro release. Even then a five-minute window carries a lot of noise.
Why this is risky for a prop account
Short windows run non-stop, which is a trap for discipline. Twenty trades an hour at 2% of the account each means 40% of the account turned over in an hour. A run of five or six losing windows is routine for a market near 50/50, and it can easily take equity to the daily limit.
Prop Hub applies the same limits here as on any other market:
- the total you buy into one outcome is capped at 5% of the starting balance;
- daily drawdown is at most 10% from equity at the start of the UTC day;
- total drawdown is at most 20% from peak equity.
Before every buy the system checks what happens if every open position loses and won’t let a single burst push you past a limit. But the limit won’t stop you spending the whole daily buffer on noise. How the limits work is covered in daily and total drawdown.
How to work with short windows
- Decide in advance how many windows per session. For example, no more than five, and only with a clear reason to enter.
- Keep size small. A window near 50/50 is a market where streaks happen all the time.
- Don’t buy at 90¢+ for a “nearly certain” outcome. The risk is almost the whole amount, the profit a few cents.
- Remember you can exit early. You can sell an open position at the current price while the market accepts orders. The whole position is sold at once.
- Start on the free account. The $100 welcome account has the same markets and prices, so you can see how often your calls match the result.
Why an outcome price is a probability and how to price a trade before entering is covered in prices as probabilities.