Analysts widely expected July's record would be difficult to sustain without an equivalent catalyst. The World Cup, co-hosted by the United States, Canada, and Mexico, generated historic activity on both platforms. The Spain-Argentina final alone drew $1.27 billion on Kalshi and roughly $4 billion in total on Polymarket's winner market, making it the single largest prediction market contract ever recorded. With the tournament over and no comparable event replacing it in August, the volume pullback is best read as a mean reversion following an anomalous event spike rather than a structural retreat. Sports contracts had accounted for more than 88% of Kalshi activity heading into August, so the calendar gap hit the sector directly.

Despite the monthly headline, underlying numbers suggest the sector is not losing momentum. Kalshi posted its first-ever weekly volume above $10 billion in the week ending August 30, reaching $10.17 billion, according to CryptoBriefing. That figure arrived in a quieter sports month, suggesting a broadening base of activity beyond tournament spikes. NFL preseason markets generated $167.8 million across both platforms in the week ending August 16, with Kalshi handling 79% of that total. Kalshi, the only prediction exchange currently licensed by the US Commodity Futures Trading Commission (CFTC), now accounts for roughly 82% of the combined monthly figure and an estimated 90% or more of all US prediction market activity. The platform's annualized trading volume rose from $52 billion to $178 billion in six months, and institutional volume grew more than 800% in the same period, according to Kalshi data reported by Forbes. These figures offer the clearest evidence that the structural growth narrative holds even as the monthly headline number pulled back. The company closed a $1 billion Series F round in May 2026 at a $22 billion valuation, up from $2 billion approximately 11 months earlier. CEO Tarek Mansour has said publicly that an IPO is under consideration, though not imminent, in remarks reported by CNBC.

Polymarket operates differently. The platform runs on Polygon PoS, a low-fee Ethereum-compatible blockchain, and settles all positions in USDC, a dollar-pegged stablecoin. It settled $3.68 billion in notional value on-chain in July, according to Dune Analytics, and crossed $1 billion in annualized revenue as of June 2026, according to research firm Sacra. Gas fees on Polygon PoS run below $0.01 per transaction, which makes it economically viable for users to open positions smaller than $10. That cost structure matters significantly in emerging markets, where average trade sizes are far lower than in Western markets. Polymarket exited the US market in 2022 following a CFTC settlement and is only now attempting a cautious return.

For users outside the United States, the regional picture is sharply uneven.

India: Regulatory Crackdown Disrupts a Notable User Base

India represents the most significant setback. The regulatory situation had long been ambiguous: in April 2025, the Securities and Exchange Board of India formally disclaimed jurisdiction over prediction markets, classifying them as "Opinion Trading Platforms" outside its regulatory scope while simultaneously warning that no investor protection mechanism existed. That vacuum was filled in May 2026, when Indian authorities classified prediction markets as illegal under newly enacted online gaming regulations and ordered Polymarket blocked. Kalshi was reportedly next in line for a similar blocking directive. The disruption carries significant weight because India had developed a notable participant base in the global prediction market sector; a Forbes investigation earlier this year traced a significant cluster of prediction market insiders and high-volume traders back to the country. The Indian crackdown is likely one contributing reason Polymarket's August contraction appears steeper than Kalshi's on a proportional basis. VPN workarounds are reportedly ongoing, but institutional and retail participation from India has been disrupted.

Africa: Open Access, Evolving Frameworks

In Nigeria, the situation is the opposite. Polymarket remains fully accessible, and the Nigerian Securities and Exchange Commission has issued no specific guidance on prediction markets. Nigerian users typically access the platform by purchasing USDC through peer-to-peer exchanges such as Yellow Card or Quidax using naira, then transferring funds via the Polygon PoS network. That pathway has gained relevance given persistent restrictions on dollar access in Nigeria. South Africa is also open, though the Financial Sector Conduct Authority has not formally authorized Polymarket as a licensed financial services provider. Luno, the South Africa-based crypto exchange, launched a native prediction markets product in both South Africa and Nigeria this year in partnership with US infrastructure provider Limitless, covering 24-hour price direction forecasts on major crypto assets including BTC, ETH, SOL, DOGE, and XRP.

Kenya: A Framework Still Taking Shape

Kenya presents a different regulatory picture. The Gambling Control Act took effect in August 2025, and the newly established Gambling Regulatory Authority was still drafting implementation rules as of early 2026. Analysts expect the authority to eventually bring platforms like Polymarket under gambling-equivalent oversight, which could mean licensing requirements or access restrictions.

The long-term growth trajectory of the sector remains steeply upward regardless of one soft month. Monthly active traders grew from roughly 4,000 in January 2024 to more than 734,000 by March 2026, a rise of approximately 18,250%, according to Pew Research. Search interest in prediction markets fell 83% from its World Cup peak by late August, according to The Defiant, closely mirroring the volume data. Industry analysts project annual trading volume across the sector could reach $240 billion by the end of 2026. Mansour has said he sees the opportunity as far from mature. "Event contracts could become a trillion-dollar market, and we're still in the early stages of that transition," he told Forbes in June 2026. Whether that projection survives contact with a thinner sports calendar and an uncertain regulatory environment in key growth regions will be the test for the remainder of the year.