Market making on Polymarket means continuously quoting buy and sell prices on both sides of a market, earning the spread on every filled trade. Some Polymarket market makers report earning hundreds of dollars per day. Here's the complete guide to getting started.
What is market making?
Market makers provide liquidity by always offering to buy and sell. You post a bid (willing to buy at X) and an ask (willing to sell at Y). The gap between them is your spread—your profit per round trip.
- Example: A market is trading around 50¢. You bid 48¢ and ask 52¢.
- Someone buys from you at 52¢: You sold at 52¢.
- Someone sells to you at 48¢: You bought at 48¢.
- Net profit: 4¢ per round trip (52¢ − 48¢).
The challenge: prices move. If the market drops to 40¢ after you bought at 48¢, you're holding a loss. Managing this inventory risk is the core skill of market making.
How Polymarket market making works
Polymarket uses a Central Limit Order Book (CLOB) where you post limit orders:
- Zero maker fees: Polymarket charges 0% on limit orders that add liquidity. This is a huge advantage for market makers.
- Taker fees on fills: When someone fills your order, they pay the taker fee—not you.
- On-chain settlement: Trades settle on Polygon. Your USDC is locked in the contract until you sell or it resolves.
- API access: Serious market makers use Polymarket's CLOB API (py-clob-client for Python) to automate quoting.
Getting started step by step
- Fund your wallet: Deposit USDC to your Polymarket wallet. Start with $500-$1,000 to learn.
- Pick a market: Choose a high-volume market you understand. Fed decisions and elections have consistent flow.
- Set your quotes: Post a bid below current price and ask above. Start with a 3-5¢ spread.
- Monitor fills: When orders fill, immediately repost on the opposite side to complete the round trip.
- Manage inventory: If you accumulate too much on one side, widen your spread or reduce size on the overloaded side.
- Track P&L: Record every trade. Your profit is total spread captured minus adverse selection losses.
Key strategies
1. Symmetric quoting: Keep equal size on both sides. If you bid 100 contracts at 48¢, ask 100 at 52¢. Rebalance when one side fills.
2. Dynamic spreads: Widen spreads during volatile periods (news releases, just before resolution). Tighten during quiet times to attract more fills.
3. Multi-market: Spread your capital across 3-5 markets. Diversification smooths returns—a bad day in one market is offset by good days in others.
4. Quote around fair value: Use your own probability estimate as the center of your quotes. If you think an event is 55% likely, center your quotes at 55¢, not at the current market price.
5. Pull quotes before events: If a major data release or game is about to happen, pull your orders. Prices can gap through your quotes instantly.
Realistic earning potential
- Casual maker ($500-$2K capital): A few dollars per day. Good for learning but not a living.
- Active maker ($5K-$20K capital): $20-$100 per day on good markets. Requires several hours of monitoring.
- Professional ($50K+ capital, automated): $100-$800+ per day. Requires bots, risk management, and full-time attention.
These are rough estimates. Actual earnings depend on market conditions, competition, and your skill level.
Key risks
- Adverse selection: Informed traders fill your quotes right before prices move. This is your biggest cost.
- Inventory blowup: One-sided fills accumulate risk. If the market resolves against your position, losses can wipe out weeks of spread income.
- Competition: As more market makers enter, spreads compress and profits shrink.
- Technical risk: Bot failures, API outages, and smart contract issues can cause unexpected losses.
- Resolution risk: Markets that resolve unexpectedly can catch market makers with large wrong-sided positions.
Use Alphascope for smarter quoting
Alphascope gives market makers an information edge:
- News → Know when to widen or pull quotes based on incoming news.
- Predictions → AI fair value estimates help you center quotes accurately.
- Arbitrage → Cross-platform pricing data informs competitive quote placement.
FAQ
How much capital do I need to market make on Polymarket?
You can start with as little as $500, but $5,000+ gives you enough to quote multiple markets and generate meaningful income.
Do I need to code a bot?
Not initially. You can start manually to learn. But serious market makers automate with Polymarket's API to manage quotes 24/7.
What's the biggest mistake new market makers make?
Not pulling quotes before big events. If you leave quotes up when results are announced, informed traders will fill your stale orders at bad prices.