Kalshi is the biggest and most established name in US prediction markets — a CFTC-regulated exchange with the deepest liquidity, the broadest payment options, and a fee structure that beats sportsbook vig by a mile. If you only try one prediction market, this is the one.
Kalshi has become the name most casual bettors think of first when the conversation turns to prediction markets, and for good reason. It’s the only CFTC-regulated exchange offering deep liquidity across sports, politics, economics, and culture markets all in one app, which gives it a breadth that sports-only competitors like ProphetX and Novig simply can’t match. Instead of betting against a sportsbook that sets the odds and takes the other side of your wager, Kalshi lets you trade contracts directly against other users, with prices moving in real time based on where the market actually sits.
New users who sign up on Kalshi and enter a promo code during registration can unlock a trading bonus tied to activity rather than a flat deposit match. The mechanics are simple: fund an account with at least $10, then settle $25 in trades within seven days. Once that trading requirement is met, win or lose, Kalshi credits a bonus to the account. The catch is that the bonus is randomized rather than fixed — most new users land on the lower end of the range, with a small percentage receiving a much larger credit, so it’s worth treating the top-line number as a ceiling rather than a guarantee. Bonus credit has to be used on Kalshi’s Predictions product and expires seven days after it’s issued, so it functions more like a short-window trading stake than cash sitting in an account. Compared to Novig’s straightforward deposit-and-get structure or Polymarket’s flat trading bonus, Kalshi’s offer requires a bit more activity to unlock, but the tradeoff is a platform with far more markets to put that credit to work in.
The exchange model is the biggest selling point here. Kalshi uses a formula-based fee structure that peaks around 1.75 cents per contract at 50/50 odds, which works out to noticeably cheaper than the vig baked into traditional sportsbook lines. Contracts start at just a penny, so you can get a feel for a market with as little as a dollar before committing more. That low barrier to entry, combined with genuinely competitive pricing, makes Kalshi an easy platform to experiment on without much financial risk. It’s a meaningfully different cost structure than what OG or Polymarket charge on comparable trades, and for high-frequency traders those fractions of a cent add up over time.
Kalshi also runs away with the deposit comparison against nearly every competitor in this space. Users can fund an account through ACH, debit card, Venmo, Cash App, PayPal, Apple Pay, Google Pay, crypto, or wire transfer — a lineup broader than anything else in the prediction market category, rivaled only by OG’s similarly expansive list. The catch shows up on the way out: withdrawals are limited to ACH, which takes one to three business days, or a wire transfer that carries a $25 fee. There’s no instant PayPal or Venmo cashout yet, so anyone used to same-day withdrawals elsewhere will need to adjust expectations.
The mobile app backs up the hype with a 4.7-star rating, real-time order books, live charts, and portfolio tracking that make it easy to watch a position move. Where Kalshi comes up short is customer support — there’s no live chat or phone line outside limited hours, so email is effectively the only way to get help if something goes wrong, a step behind platforms that offer more direct support channels. It’s also worth noting that sports contract access has faced legal challenges in a handful of states, which has created some short-term confusion for traders in those markets. Anyone signing up should double check availability in their state before funding an account and claiming the welcome offer.
Against sports-only exchanges like ProphetX and Novig, Kalshi’s biggest edge is variety — political, economic, and cultural markets alongside sports give traders more to work with year-round, especially during slower sports stretches. Against Polymarket, the comparison is closer: both offer broad market coverage and strong liquidity, though Polymarket’s flat trading bonus is more predictable than Kalshi’s randomized credit. For traders who want one app that covers sports and beyond, with contracts cheap enough to start with a few dollars, Kalshi remains one of the most well-rounded options in the category.
