Kalshi Posts Record $15 Billion Week, Including Its First $3 Billion Day
Kalshi traded $15.27 billion in contract volume for the week of September 14–20, its highest weekly total of 2026. That included the platform’s first day above $3 billion, reaching $3.17 billion on September 20. Kalshi and Polymarket’s global platform combined for $16.43 billion, up 16.3% from the prior week, with Kalshi accounting for about 93% of that total.
Sports led the activity, with NFL and college football markets among the busiest, while crypto markets added another $2.16 billion on Kalshi. Cross-category, multi-leg “combo” markets made up the largest share of Kalshi’s volume. Separately, a PitchBook analysis estimates Kalshi could be worth as much as $42 billion ahead of a possible IPO, up from the $22 billion valuation of its May funding round. That estimate depends on the outcome of a pending Supreme Court case that could let individual states regulate the platform.
For trading firms, rising volume makes prediction markets a venue category worth evaluating for reliable order access, market data and resilient connectivity. The right design depends on the venue’s current endpoints and approved access methods. Firms can compare cloud and colocation options with routes back to their existing equities and futures infrastructure after confirming the actual trading path.
Quick FAQ
Where do trading firms connect to Kalshi?
Start with Kalshi’s current approved trading and market-data endpoints and access methods. Confirm the full network path and participant eligibility with the venue before choosing a cloud region, colocation site or lowest-latency route.