Bitcoin downside: Polymarket prices a deeper fall than Kalshi

$80,000 anchors October expectations

Bitcoin’s October downside contracts show a clear gap between Polymarket and Kalshi. According to cryptotimes.io, Polymarket assigns a 72% probability to Bitcoin touching $80,000, while Kalshi puts the chance of trading below that threshold at 62%. The 10-percentage-point difference comes with a wording distinction: reaching a level and moving below it are not identical outcomes.

Bitcoin traded near $82,418 on October 12. At the reported market snapshot, its price was around $82,418.73—roughly $2,419, or about 2.9%, above $80,000. Polymarket’s $82,500 threshold had already settled Yes, making $80,000 its highest-probability unresolved downside target.

Deeper declines expose a wider divide

Polymarket also assigns higher probabilities to lower October targets: 45% for touching $77,500, 28% for $75,000 and 18% for $72,500. Kalshi’s corresponding below-threshold probabilities are 39%, 22% and 13%. Farther down, Kalshi prices a fall below $70,000 at 8%, below $67,500 at 6% and below $65,000 at 2%, according to cryptotimes.io.

The platforms’ displayed changes point in different directions for several deeper targets. Polymarket’s $80,000 probability fell three percentage points, but its $77,500, $75,000 and $72,500 readings rose eight, five and two points, respectively. On Kalshi, the corresponding downside probabilities declined six, seven, eight and seven points.

Upside activity exceeds downside volume

Kalshi’s October upside contracts put the probability of Bitcoin exceeding $87,500 at 48%, down 24 percentage points, and exceeding $90,000 at 32%, down 18 points. The readings fall to 18% at $92,500, 8% at $95,000 and 5% at $97,500. Polymarket also assigns 18% to reaching $92,500, but puts $97,500 at 8%. From roughly $82,418, reaching $90,000 would require a gain of about 9.2%; $92,500 and $97,500 would require around 12.2% and 18.3%, respectively.

Kalshi’s upside market recorded approximately $706,761 in volume, compared with approximately $244,836 for its downside market—nearly three times as much, cryptotimes.io reported. That difference measures trading activity, not bullish conviction. On Polymarket, the 28% probability for $75,000 remains 10 percentage points above the probability for $92,500, even though the lower target is more than $7,000 below Bitcoin’s reported price.

What it means for prediction markets

• Contract wording matters: Polymarket’s touch probabilities and Kalshi’s below-threshold probabilities should not be treated as perfectly interchangeable.
• The downside gap is consistent: Polymarket assigns higher probabilities at every shared downside target reported, while several deeper contracts show opposing changes across the platforms.
• Upside agreement is selective: Both platforms show 18% around the $92,500 October target, but differ at $97,500.
• Volume is not a directional signal: Kalshi’s heavier upside trading does not, by itself, indicate that participants expect a rally.