The design of "specific outcome combinations" is quite clever, essentially bringing parlay onto the blockchain and also subject to CFTC regulation.

CoinWorld News reports that prediction market provider Polymarket submitted a self-certification application to the Commodity Futures Trading Commission on Wednesday, planning to list a portfolio of sports event contracts in the United States. These contracts are called "composite outcome contracts" and require specific user-defined outcomes to settle at $1.00. If any single outcome is not met, the contract will settle at $0.00. The document states that Polymarket will go public on or after May 21, 2026. Additionally, the Securities and Exchange Commission is studying possible forms of exchange-traded funds (ETFs) around prediction markets, with Chair Paul Atkins noting that ETF assets have tripled over the past seven years.