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Market Making Strategy

Provides liquidity on both sides of the order book, profiting from the bid-ask spread while maintaining minimal directional exposure.

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What it is

Market making is the practice of continuously quoting buy and sell prices on both sides of a market's order book. The market maker profits from the difference between the price they buy at (bid) and the price they sell at (ask). They don't take a view on the outcome — they earn the spread by facilitating trades for other participants who want immediate execution.

How it works

A market maker places limit orders on both sides of the book simultaneously. If Yes is trading around $0.50, they might bid $0.49 and offer $0.51. When both orders fill, they've earned $0.02 per share without taking any directional risk. The key is maintaining tight spreads and managing inventory — if too many trades fill on one side, the maker adjusts quotes to rebalance.

Successful market makers operate at high frequency with automated systems that continuously update quotes based on order flow, volatility, and inventory levels. They need deep capital to absorb temporary imbalances and sophisticated risk management to avoid getting caught on the wrong side of sudden price moves.

Bid-Ask Spread Visualizer

Adjust mid-price and spread width. The green zone is profit captured per round trip.

Bid $0.48Spread $0.04Ask $0.52
Mid price$0.50
Spread width$0.04
Profit per round trip: $0.04 (8.3% of bid)

How it works in practice

On prediction market order books, market makers are the primary source of liquidity. They maintain resting orders at multiple price levels, tightening spreads in liquid markets and widening them in volatile or illiquid ones. Their presence is what allows other traders to enter and exit positions without excessive slippage.

The most active market makers operate across hundreds of markets simultaneously on platforms like Polymarket, Kalshi, and Probable Markets, using algorithms to price risk and manage exposure in real time. They're identifiable by their high maker-order percentage (typically above 60%), short holding periods, and presence on both sides of nearly every market they touch.

Revenue at Scale

Spreading across more markets increases total spread income. Assumes ~3 fills per market per day.

Key Characteristics

The behavioral fingerprints that identify a market maker in on-chain data.

01
High Maker Order Percentage
Market makers place the majority of their orders as limit orders (maker orders) rather than market orders, providing liquidity rather than consuming it.
02
Short Holding Periods
Positions are held for minutes to hours, not days. The goal is to capture spread, not to predict outcomes over longer timeframes.
03
Broad Market Coverage
Active market makers quote across hundreds or thousands of markets simultaneously, diversifying their spread income across many uncorrelated events.
04
Both-Side Presence
Consistently present on both Yes and No sides of the order book, adjusting quotes dynamically to manage inventory and capture spread.
05
Automated Execution
Quoting and risk management are typically fully automated, enabling the speed and consistency required to maintain competitive spreads across many markets.

Risks to Consider

Adverse selection — informed traders may pick off stale quotes before the market maker can update them, leading to systematic losses against traders with better information.
Inventory risk — large one-sided order flow can leave the market maker with significant directional exposure that's difficult to unwind in illiquid markets.
Volatility spikes can cause rapid price moves that exceed the spread, turning profitable quotes into losses before they can be adjusted.