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definition

What is Polymarket and How Does It Work

Polymarket is a decentralized prediction‑market exchange where users buy and sell outcome shares that pay $1.00 if they resolve YES and $0.00 otherwise. The platform runs on Polygon and uses a central limit order book (CLOB) with pUSD (wrapped USDC) as the settlement asset. Traders place limit or FAK market orders; outcome shares are ERC‑1155 tokens issued by the Gnosis Conditional Token Framework and settled via the UMA oracle. If you’re a trader or crypto native, understanding these mechanics shows how price inefficiencies appear and how PolyArb captures them.

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How Polymarket actually matches trades

Polymarket uses a Central Limit Order Book (CLOB) model: orders sit on book until they match. Best bid and best ask define spreads; tick size is usually $0.01 and narrows to $0.001 near price extremes. Market orders on the UI are implemented as Fill‑And‑Kill (FAK), which execute immediately against resting liquidity or cancel to prevent excessive slippage. Because maker fees are zero and taker fees vary by category, liquidity providers often tighten spreads, creating transient arbitrage opportunities when complementary outcome asks sum to less than $1.00.

Why outcome tokens and settlement matter

Each outcome is an ERC‑1155 token minted via CTF. Traders can split a complete set from $1.00 of pUSD and later merge or redeem after resolution for $1.00 per winning token. Resolution is reported by UMA’s optimistic oracle; disputes can pause settlement and extend the time before redeeming winnings. That settlement timing and oracle dispute risk are key considerations — apparent arbitrage edges can be mathematical, but they carry settlement and resolution risk that you must account for when executing.

Where arbitrage shows up on Polymarket

Common intra‑market arbitrage is simple: in a binary, if bestAsk(YES) + bestAsk(NO) < $1.00 you can buy both legs and lock the edge once filled. Multi‑outcome markets work the same with the sum of best asks across outcomes. These spreads are often short‑lived — historically many arbitrageurs captured sizable value from fleeting inefficiencies. PolyArb automates detection and execution of these opportunities with 40ms latency, Telegram and Discord alerts, and a $7.62 minimum guaranteed edge per trade to customers.

How this affects your trading

If you trade Polymarket manually you can spot occasional mispricings, but fill risk and latency limit capture. Using an automated agent like PolyArb reduces reaction time and can execute tight edges repeatedly. PolyArb is non‑custodial, runs live today, and is priced at $99/month for low‑latency access. Remember: no arb is universally risk‑free. Resolution disputes, partial fills, slippage, fee changes, and smart‑contract risk remain. Treat edges as mathematical opportunities that require operational safeguards.

Start capturing Polymarket arbitrage with PolyArb

Subscribe to PolyArb for 40ms execution, real‑time alerts, and a $7.62 minimum guaranteed edge per trade. Get automated, non‑custodial arbitrage running live today.

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FAQ

Is Polymarket centralized or decentralized?
Polymarket is a decentralized exchange built on Polygon that uses smart contracts (Gnosis CTF) for outcome tokens and UMA for resolution, but it uses a hosted Relayer to sponsor gas and a centralized order‑matching CLOB.
What currency do I need to trade on Polymarket?
Trading on Polymarket requires pUSD, Polymarket’s wrapped USDC on Polygon. Gas is sponsored through the Polymarket Relayer so you don’t need POL for transactions.
How does PolyArb improve arbitrage capture on Polymarket?
PolyArb monitors the CLOB for intra‑market edges and executes with low latency (40ms) relative to free bots (~800ms). It sends Telegram and Discord alerts, is non‑custodial, and guarantees a $7.62 minimum edge per trade for subscribers.
What are the main risks when arbitraging on Polymarket?
Key risks include UMA resolution disputes delaying settlement, partial fills or slippage, fee changes, and smart‑contract risk. Geographic restrictions also limit who can place new orders from certain countries.

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