What is Polymarket and How Does It Work?

If you've seen Polymarket mentioned in crypto circles, financial news, or on social media, you might be wondering what it actually is. This guide explains Polymarket from the ground up — no jargon, no assumptions.

Polymarket in One Sentence

Polymarket is a decentralised prediction market where people trade on the outcomes of real-world events using USDC on the Polygon blockchain.

Instead of stocks or crypto tokens, you trade yes/no contracts. Each share is worth either $1 if the event happens, or $0 if it doesn't. The price of a share at any moment reflects what the market collectively believes the probability is.

What is a Prediction Market?

Prediction markets have existed in various forms for decades. The core idea: let people trade on uncertain outcomes. The prices that emerge aggregate collective knowledge and expectation more efficiently than polls or pundit forecasts.

Examples of Polymarket questions:

• "Will the Fed cut rates in June 2026?" — trading at $0.62 → market implies 62% probability
• "Will BTC close above $100k by end of Q3?" — trading at $0.38 → 38% probability
• "Will [Candidate X] win the 2026 election?" — trading at $0.55 → slight favourite

You don't need to hold until resolution. You can buy at $0.30 and sell at $0.60 if sentiment shifts — capturing the movement without waiting for the event to resolve.

How Does Polymarket Actually Work?

The Order Book (CLOB)

Polymarket uses a Central Limit Order Book (CLOB) — the same fundamental structure used by professional exchanges like CME or Nasdaq. Buyers and sellers post limit orders; the book matches them when prices agree.

This means:

• Real bid/ask spreads — you can see the depth of the market
• Limit orders — you choose your exact entry price
• Market orders — fill immediately at the best available price

Settlement in USDC

All positions are denominated and settled in USDC (USD Coin), a regulated stablecoin pegged to the US dollar. This means your profit and loss is in dollars, not in a volatile crypto asset.

Critically, your USDC stays in your own wallet on the Polygon network. Polymarket is non-custodial — they never hold your funds. You trade directly from your wallet via the API or their interface.

Market Resolution

When an event concludes, a resolution source (typically a trusted oracle or the Polymarket team using verifiable data) determines the outcome. Shares in the winning outcome resolve to $1.00. Shares in the losing outcome resolve to $0.00. USDC is distributed accordingly.

Why Do People Trade on Polymarket?

Traders use Polymarket for different reasons:

• Information edge — if you have better information or analysis than the market, you can trade on it
• Hedging — if you hold crypto and want to hedge election or macro risk, prediction markets can offset exposure
• Speculation — like any market, prices fluctuate before resolution, creating trading opportunities
• Copy trading — following top-performing wallets on the Polymarket leaderboard

What are the Risks?

Polymarket is built on the Polygon blockchain, which means all trades are settled on-chain in USDC. You don't need to trust Polymarket to hold your funds — the smart contracts handle settlement automatically at resolution. For a deeper look at how to use this to your advantage, see our guide on how to automate Polymarket trading.

• Incorrect outcome predictions — the market can be wrong and so can you
• Liquidity risk — thin markets can have wide spreads and slippage
• Resolution disputes — ambiguous events can result in unexpected outcomes
• Smart contract risk — as with all blockchain applications, bugs are possible

For a full breakdown, read our dedicated guide: Polymarket Trading Risks Explained.

Can You Automate Polymarket Trading?

Yes. Polymarket exposes a public CLOB API that allows programmatic order placement, position management, and market data access. This is how algorithmic trading bots operate on the platform.

Automation allows you to:

• Trade 24/7 without watching markets manually
• Execute strategies at consistent speeds that are impossible manually
• Apply rules-based risk management without emotional deviation
• Copy top leaderboard wallets in near real-time

Summary

This article is for educational purposes only and does not constitute financial or investment advice. Polymarket trading involves substantial risk of loss. Only trade with capital you can afford to lose.