How does polymarket work

Overview

Polymarket is a decentralized prediction market platform that enables users to speculate on the outcomes of real-world events using cryptocurrency. Founded by Shayne Coplan and launched in 2020, it operates on the Polygon blockchain (formerly Matic Network), which provides faster transactions and lower fees compared to Ethereum mainnet. The platform emerged during a period of growing interest in decentralized finance (DeFi) and prediction markets, building on concepts pioneered by platforms like Augur and Gnosis. Polymarket gained significant attention during the 2020 U.S. presidential election, where it became one of the largest prediction markets by volume, processing millions in trades. Unlike traditional sportsbooks or betting platforms, Polymarket positions itself as an information aggregation tool where market prices reflect collective wisdom about event probabilities. The platform has faced regulatory scrutiny from the CFTC, which in 2021 charged it with operating an illegal off-exchange event market, resulting in a settlement and restrictions on U.S. users.

How It Works

Polymarket operates through smart contracts on Polygon blockchain that create prediction markets for specific events. Users deposit USDC stablecoins into their accounts and can then buy or sell shares in possible outcomes. Each market has multiple outcomes (typically yes/no or multiple choices), with share prices ranging from $0 to $1 representing the market's implied probability of that outcome occurring. For example, if shares for "Candidate X wins election" trade at $0.75, this suggests a 75% probability. Trading occurs peer-to-peer through an automated market maker (AMM) model, with liquidity provided by users who earn fees. When an event resolves (based on predetermined, verifiable sources like election results or sports scores), shares for the correct outcome redeem for $1 each, while others become worthless. The platform charges a 2% fee on winning trades. Users can also create their own markets by staking collateral and defining resolution criteria, though this requires approval to maintain quality.

Why It Matters

Polymarket matters because it demonstrates how blockchain technology can create transparent, global prediction markets that aggregate information more efficiently than polls or experts. During events like elections or major sports championships, these markets often provide more accurate forecasts than traditional methods, as prices instantly incorporate new information. This has practical applications for businesses, journalists, and policymakers seeking real-time sentiment data. Additionally, Polymarket represents a significant experiment in decentralized governance and censorship resistance—since markets exist on a public blockchain, they cannot be easily shut down by authorities. However, the platform also highlights regulatory challenges in DeFi, as seen in the CFTC settlement that limited U.S. access. As prediction markets grow, they could potentially transform how society processes uncertainty, though questions about manipulation, regulation, and accessibility remain unresolved.