(4-hour)
Top/Bottom Callers Contest
Predict Bitcoin's price. Closest prediction takes the pool. Every 4 hours.
— BTC/USD
Entries lock in —
Pool $0.00
Entries 0
Settles in —
$
Pick a price around the live index
$
From $0.10 up to $1,000,000
Entered already? You can add stake to the same price until lock.
Prediction Book
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Bottom callers
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Top callers
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Recent rounds
| Round | Settle P1 | Winning call | Winners | Pool |
|---|---|---|---|---|
| — | ||||
How it works
Enter the BTC/USD price you think Bitcoin will hit, with any stake from $0.10 up to $1,000,000, while the round is open. One prediction per round — you can add stake to it, but the price is locked in.
At the boundary the round locks. No entries, top-ups, or cancellations after lock — everyone's prediction is final before the measurement window starts. Until lock you can cancel your entry for a full refund.
When the measurement window ends, the settlement index P1 decides it: the prediction(s) closest to P1 win. Winners get their stake back plus the losers' pool, split in proportion to stake.
Two prices are recorded per round: the lock price P0 (the BTC/USD index the moment entries freeze — it marks the start of the measurement window) and the settlement price P1 (the index when the window ends). Only P1 decides winners; P0 is kept for transparency and shows up in the round history.
Fewer than two players, everyone tied, or a price-feed outage voids the round and every entry is refunded in full.
Zero fees — winners take the entire losing pool, and a winner never gets back less than their stake.