Data & Insights: Prediction Market Shares Grow; A Duopoly

Critical Mass Attention

• Google search volume for "prediction markets" stood at 95 in March 2026, following readings of 97, 99, and 100 in December, January, and February, respectively.
  • Four consecutive months above 95 is unprecedented in the dataset's history.
  • Every prior prediction market search spike was mapped to a single event and died with it. Current levels have sustained without a catalytic event, having achieved standalone product-market fit
  • Sustained search volume above 95 also represents a continuous new-user acquisition funnel operating at maximum capacity for months.
  • Google Trends measures unique interest, and a plateau at peak levels means the addressable market for prediction markets is being penetrated at a rate that shows no saturation as of yet,meaning prediction market platforms have been building a retained user base rather than short-term tourists.
• However, this level of sustained public interest makes regulatory action both more likely and more politically constrained.
  • Prediction markets are now popular enough that heavy-handed regulation carries voter backlash risk, but prominent enough that regulators cannot ignore them.
  • This means that the CFTC's posture toward Polymarket and Kalshi will likely be shaped by the reality that millions of people, Americans in particular, are now actively searching for these products every month.

Unprecedented Growth, Predictable Response

• The prediction markets-to-spot exchanges volume ratio hit 2.28% in March 2026, a new all-time high. The ratio first crossed 1% just three months ago in December 2025.
  • The ratio's explosive growth is partially a denominator effect. Spot crypto volumes on centralized exchanges have been declining, which mechanically inflates the ratio even if prediction market volumes held flat. But they are not holding flat.
  • Prediction markets processed roughly $100-125 billion per month through the first eight months of 2025. March is tracking at $944 billion through its first 21 days.
  • Prediction markets went from a $100 billion/month industry to a $1 trillion/month industry in under six months. The ratio is rising because the numerator 10x'd while the denominator was halved, both moving in the same direction, which compounds the effect.
• At $1 trillion/month in volume, prediction market platforms now generate enough trading fee revenue to fund aggressive liquidity incentive programs, market maker rebates, and user acquisition campaigns, creating a self-reinforcing flywheel
  • Crypto exchanges face a strategic crossroads. Their core product, which is essentially directional price exposure on crypto assets, is losing share to an alternative format for expressing views on discrete outcomes.
  • The most logical and predictable response for these exchanges is to build or acquire prediction market capabilities, with the likes of Binance and Bybit already offering these products in-house.

It's Quiet Over Here

• Combined BTC, ETH, and SOL spot volumes across centralized exchanges fell to $645 billion in February 2026 and are on pace for ~$536 billion in March.
  • These three assets now account for ~88% of all crypto spot volume, up from ~79% in February, showcasing how most altcoins have continued their path to irrelevance.
• From this, BTC’s volume dominance is the risk barometer that's highlighting the market’s defensive stance.
  • BTC's share of total spot volume rose from 33% in August 2025 to ~54% in March 2026, a massive swing in just a 7-month timespan.
  • When BTC dominance rises this high on declining aggregate volume, it most likely means a contraction in overall risk appetite, where remaining capital is consolidated into the crypto asset perceived as “safest”.
  • This same composition shift occurred in the second half of 2022 as volumes compressed after consecutive events of the Terra Luna and 3AC collapses, and heading into the FTX collapse.
• A second-order effect from ETH's volume decline is also a compression of its gas fee revenue, which feeds directly into its validator economics and the ETH burn mechanism under EIP-1559.
  • Lower volume means lower fees, lower burn, and weaker deflationary pressure on ETH supply, thereby undermining a core bull thesis

Everybody's a Duopoly 

• The prediction market space has quietly settled into a two-player dynamic. Kalshi and Polymarket collectively account for roughly 91% of weekly notional volume, with approximately 46% and 45%, respectively, leaving little room for anyone else at the table.
  • This kind of market structure is not unfamiliar in crypto. Stablecoin supply is dominated by USDT and USDC, crypto volume has long been split between Binance and Coinbase. 
  • Prediction markets appear to be following a similar consolidation pattern, where network effects and liquidity depth make it structurally difficult for new entrants to gain meaningful traction.
• While several challengers have attempted to carve out a share over the past year, many have faded back into the noise. This activity has been marked by short-lived spikes that fail to sustain, with volume gravitating back toward the two incumbents.
  • The durability of this duopoly likely comes down to moats on both sides. Kalshi's CFTC-regulated status provides a compliance layer that institutional and domestic retail participants increasingly value. 
  • Polymarket, now also accessible to US users, brings deep liquidity and a track record across high-profile political and macro events. Together, they cover the two ends of the market credibility spectrum.
• Interest in the space remains high, with a number of well-funded teams actively building prediction market infrastructure. Whether any can meaningfully disrupt the current order remains an open question, but based on the volume data, displacement looks more difficult than the narrative around the sector's growth might suggest.

Up or Down

• Polymarket's crypto up/down markets have quietly expanded beyond BTC and ETH, with the platform adding directional markets for assets like DOGE, BNB, and HYPE.
  • Polymarket allows users to trade 5, 15, 60-minute instruments, as well as 4H and daily. 
• BTC continues to dominate, commanding roughly 66% of daily notional share, with ETH holding second. The remaining coins collectively split the remainder, though none have managed to carve out sustained share in a meaningful way, which itself reflects where conviction and liquidity naturally pool in crypto markets.
• Polymarket's up/down markets are time-bounded and binary, settling on whether an asset closes above or below its entry price within a fixed window.
  • This places them closer in character to options than to perpetual futures. Participants are exposed to something analogous to time decay: the longer the market runs without moving in the anticipated direction, the less valuable an out-of-the-money position becomes as the settlement window compresses.
• Unlike perpetuals, there is no funding rate, no margin call risk, and no liquidation cascade. The payout structure is fixed, and the maximum loss is the premium paid. For traders seeking defined-risk directional exposure, particularly over short time horizons, these instruments offer a distinct risk profile compared to perp DEXs.
  • That said, liquidity constraints remain a practical ceiling. Notional volumes across these markets sit in the tens of millions, which limits their utility for larger positions. For now, they function more as complementary instruments than as direct competitors to derivatives venues.