The scale is hard to ignore. Global prediction markets reached $44 billion in total volume in 2025, a 130-fold increase from early 2024 levels, and the World Cup is emerging as the single largest event within that expansion. Polymarket's single "World Cup Winner" contract has recorded $2.9 billion in total trading volume since launching in July 2025, making it one of the largest individual prediction market contracts ever created. Polymarket runs 475 active World Cup markets; Kalshi runs approximately 500. Both platforms allow users to trade on outcomes ranging from overall tournament winners to individual match results and player performance, with positions settled in stablecoins rather than fiat currency.

The wins have been notable. So have the losses. An anonymous trader bet roughly $9 to $13 million on Belgium to defeat Egypt and lost the full position when the result went the other way. Asia Business Daily reported the losing position at approximately 13.8 billion Korean won, suggesting the trader may have been based in Korea, though that detail has not been independently confirmed. A separate trader staked just under $1 million on Spain to beat Cape Verde; Spain drew 0-0 against the 67th-ranked team. A third user, trading under the name "FlickRaw," dropped approximately $4.2 million across two consecutive losing positions inside 24 hours, first on Netherlands versus Japan and then on Belgium versus Egypt. As of June 22, 2026, France leads Polymarket's tournament winner market at 18.4% implied probability following a 3-1 opening win over Senegal. Spain fell to 13.8% after the Cape Verde draw.

How Polymarket Works On-Chain

Polymarket settles all trades on Polygon, an Ethereum layer-2 network, using a stablecoin called Polymarket USD (pUSD), which is backed one-for-one by Circle-issued USDC. The structure keeps transaction fees close to zero and enables near-instant settlement. Intercontinental Exchange, the parent company of the New York Stock Exchange, made a $2 billion strategic investment in Polymarket in October 2025, valuing the platform at roughly $8 billion. The following month, November 2025, the US Commodity Futures Trading Commission (CFTC) granted Polymarket status as a Designated Contract Market, the same regulatory tier as conventional futures exchanges, after the company acquired QCEX, a CFTC-licensed derivatives exchange and clearinghouse. Monthly trading volume on Polymarket hit a record $3.02 billion in October 2025, with sports markets accounting for more than 60% of open interest.

The Regulatory Fault Lines

The US regulatory picture is fractured. The CFTC published a proposed rulemaking on June 10, 2026 that would allow most sports event contracts to continue operating under a "price discovery" rationale but would ban contracts tied to individual player injuries, referee decisions, or specific in-game micro-events. At least eight states, including Arizona, Nevada, and Illinois, have issued cease-and-desist orders against prediction market platforms, while the CFTC argues that federal law under the Commodity Exchange Act overrides those state actions. Legal observers anticipate a federal circuit split that could eventually reach the Supreme Court. Two bipartisan bills in Congress, the Prediction Markets Are Gambling Act and the STOP Corrupt Bets Act, were introduced in March 2026 but have not advanced in committee. DraftKings, meanwhile, acquired CFTC-regulated platform Railbird and has launched its own prediction product in 38 US states.

Joseph Grundfest, a former SEC Commissioner and Stanford Law School scholar, raised a different concern in April 2026. "Prediction markets proliferate contracts on 'micro-decisions' that are more directly related to very specific forms of knowledge," he said, pointing to insider trading vulnerabilities in prediction markets. The remark highlights a category of risk that securities law, written for conventional financial instruments, was not designed to address.

Africa and Asia Carry the Growth and the Risk

Outside the US, the picture varies sharply by country. India blocked Polymarket access in May 2026 after the Ministry of Electronics and Information Technology issued an advisory naming the platform directly. New rules that took effect May 1, 2026, formally titled the Promotion and Regulation of Online Gaming (PROGA) Rules, classify prediction markets as money games under existing illegal betting law. Indonesia blocked Polymarket on May 25, 2026, after a market speculated on whether President Prabowo Subianto would leave office before his term ended. The action reflects a broader pattern in which governments across Muslim-majority South and Southeast Asian nations are moving against prediction markets on both moral and political grounds. Enforcement faces practical limits, however. Grundfest has separately observed: "U.S. persons do use virtual private networks. Most troubling leaks related to national security events have appeared on Polymarket." Polymarket's open API and on-chain data remain publicly accessible on Polygon even where the platform's user interface is blocked, though integrating those data feeds into consumer-facing products in restricted jurisdictions carries legal risk.

Africa presents a different profile. Sub-Saharan Africa recorded $205 billion in on-chain crypto activity between July 2024 and June 2025, a 52% year-over-year increase. Nigeria alone accounted for $92.1 billion of that figure, with monthly peer-to-peer crypto volumes exceeding $2.4 billion; active prediction market operators in the country include Luno and Bayse Markets, formerly known as Gowagr. In Kenya, the Virtual Asset Service Provider (VASP) Bill enacted in October 2025 created a new licensing framework for the sector, building on a mobile payments infrastructure through M-Pesa that processes more transactions annually than Western Union does globally. South Africa operates under a Crypto Asset Service Provider (CASP) licensing regime and has an interactive gambling market valued at $3.3 billion. The continent's online gambling market overall is valued at $12.7 billion in 2026 and is projected to reach $19.4 billion by 2030. Youth participation in betting stands at 71% in Ghana, 79% in Kenya, and 83% in South Africa, figures that carry serious public health weight. In Ghana, research has found that 84% of young gamblers showed moderate-to-problematic behavior, 68.8% reported clinical anxiety, and 43.6% suffered from depression. A June 2026 analysis by TechLabari warned that "African governments must act proactively rather than reactively to prevent a generation of youth whose capital and mental health have been drained." Nigeria and Kenya currently offer the clearest regulatory entry points for developers building on prediction market infrastructure, though that could shift quickly as legislation moves.

What Comes Next

The CFTC comment window on its proposed rulemaking closes on July 25, 2026, 45 days after the June 10 publication date. The outcome will determine whether the current legal scaffolding around US-facing prediction markets holds or forces another round of structural changes. Polymarket's POLY governance token, which was expected in early 2026, has not yet launched and could introduce staking mechanics and protocol-level fee distribution once it does. The World Cup's $7 billion in trading volume is a single event inside a market that posted $44 billion globally in 2025. At that scale and pace of growth, the regulatory question is no longer one any jurisdiction can afford to defer.