Polymarket vs Kalshi: Bitcoin Up or Down markets
Polymarket and Kalshi both run short-term Bitcoin up-or-down markets that pay $1 a share, but they differ in how they set the price to beat, settle results and charge fees. Here's how each works and how they compare.
Polymarket Bitcoin Up or Down markets explained
Polymarket lists Bitcoin Up or Down markets in several window lengths, including 5-minute and 15-minute versions. Each round's price to beat comes from the Chainlink BTC/USD data stream, ties go to Up, and winning shares settle at $1. The same 5-minute market is also offered to eligible KuCoin users through KuCoin Predictions, paid in USDT (KuCoin's guide). Traders buy UP or DOWN shares priced between 1¢ and 99¢ and can sell before the close.
BTC Up/Down copies that structure: a price to beat, a fixed end time, two sides that add up to about $1, and the ability to sell before the close. If you're looking for a Polymarket simulator or a way to practise Polymarket BTC up or down without funding an account, this is it. Prices here come from a model rather than Polymarket's order book.
Kalshi 15-minute Bitcoin markets explained
Kalshi is a CFTC-regulated US exchange, and its 15-minute Bitcoin series opens a new up-or-down window every quarter hour, 96 a day. Each window pays $1 on the winning side (summary of the series rules):
- Target: the previous window's final value becomes the next window's price to beat.
- Settlement: the CF Benchmarks Bitcoin Real-Time Index (BRTI), averaged over the window's final 60 seconds.
- Ties: YES wins if the final value is at least the target.
- Trading: orders stop at each window's close, and markets usually settle within seconds.
BTC Up/Down is a free way to practise that Kalshi-style Bitcoin format with play money. It is not connected to Kalshi, and Kalshi's contract terms can change, so always read the current rules.
Polymarket vs Kalshi vs BTC Up/Down
The three share the same $1-per-share format but differ in money, sign-up, settlement and cost.
| Polymarket | Kalshi | BTC Up/Down | |
|---|---|---|---|
| Money | Real money | Real money | Play money only |
| Sign-up | Account and funding | Account with ID verification | None |
| What it is | Prediction market | CFTC-regulated US exchange | Free browser simulator |
| BTC windows | 5-minute, 15-minute and longer | 15-minute series, plus others | 5 seconds to 15 minutes |
| Settlement price | Chainlink BTC/USD data stream | CF Benchmarks BRTI, final-minute average | Live exchange trade price |
| Prices | Live order book | Live order book | Model from live BTC volatility |
| Cost to try | Your stake plus spread and any fees | Your stake plus fees | Free |
| Best for | Trading real markets | Trading real markets in the US | Learning and practising |
BTC Up/Down is not affiliated with, endorsed by or connected to Polymarket or Kalshi. Their names are used only to describe the kind of market this simulator copies. Platform details change, so check each platform's own rules, and whether it's available where you live, before trading.