Decentralized Order Book Architecture
Unlike traditional sportsbooks that set lines with built-in profit margins (vigorish), Polymarket operates a Central Limit Order Book (CLOB) on the Polygon blockchain. Participants trade binary outcome shares priced between $0.00 and $1.00, representing the market's collective consensus probability.
Oracle Resolution and UMA Optimistic Verification
Market outcomes are settled deterministically using UMA's Optimistic Oracle. Anyone can propose an outcome with a bond, and token holders resolve disputes transparently on-chain, eliminating the risk of centralized operator fraud or subjective cancellation.
Non-Custodial Settlement and Capital Security
Polymarket users retain custody of their funds in their own Web3 wallets. Winnings and liquidity are held in audited smart contracts and settle directly in USDC stablecoins on Polygon with negligible transaction fees.