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The available documentation explains how inventory-aware quoting on Polymarket works, but it does not verify a particular trader’s implementation or results. This guide therefore describes a practical, source-grounded framework—not a personal trading account or a proven profitable strategy. The core idea is to quote around an independent estimate of fair value while adjusting orders to account for the outcome shares you already hold and the additional exposure your live orders could create.
What inventory-balanced market making means
Polymarket outcome shares trade between $0.00 and $1.00. A share price can be read as a market-implied probability, but it is not a guaranteed forecast. The displayed price may be the midpoint between the best bid and ask; a buyer who wants an immediate fill pays an available ask, while a seller receives an available bid. See Polymarket’s Prices & Orderbook documentation.
Market makers provide prices on both sides of a market. Polymarket describes the role this way: “Market makers maintain bids and asks around their fair value so other traders can execute in either direction.” The difficult decisions are how to estimate fair value and how much risk to accept around it, as its Market Making documentation explains.
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Inventory is the position in outcome tokens created by filled trades. If one side of your quotes keeps filling, you can accumulate a large position in one outcome. Live orders matter too: if several resting orders fill, exposure can change quickly. An inventory-aware approach treats quotes as a feedback loop: estimate value, inspect executable prices, account for filled and potential exposure, then place or adjust orders within defined limits.
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1. Estimate fair value independently
Start with an estimate of the outcome’s value that is separate from the current midpoint. A midpoint is a reference derived from the book, not proof that you can trade there. Compare your estimate with the executable bid and ask, and inspect available depth before choosing a price or order size. Polymarket’s order-book guide describes the distinction between displayed prices and execution prices.
2. Check whether the market can accept your quote
Before submitting orders, validate the market’s status, minimum price increment, and minimum order size. These constraints affect which prices and sizes are valid; they do not indicate whether a quote is economically sound. Polymarket covers these checks in its market-making documentation.
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3. Set prices and sizes around both value and exposure
Choose quotes that reflect your fair-value estimate, available liquidity, and risk limits. As an illustrative inventory-control principle, you could reduce or make less attractive the side that would add to an already large position, while making the side that would reduce that position more competitive. This is a general explanation of inventory management, not a formula prescribed by Polymarket or a verified method used by the author of the original title.
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4. Track fills and open orders together
Maintain a current view of filled positions, partial fills, and resting orders. A partially filled quote has both a changed position and a remaining order that may still fill. Cancel or update quotes when your estimate, position, or relevant market conditions change. Polymarket’s Place Orders guide describes limit orders that can rest, partially fill, or be canceled, while its Trading Overview explains order submission and trade settlement.
5. Reassess when conditions change
Recalculate or review quotes after material news, changes in book depth, or a meaningful change in inventory. A quote that fit your estimate and limits earlier may no longer do so. No static spread or inventory cap guarantees protection from stale quotes, adverse selection, or an unfavorable resolution.
Choose order types with execution trade-offs in mind
| Order type | What it does | Trade-off |
|---|---|---|
| Market order | Trades against available liquidity at the best available quotes. | Can execute promptly, but the fill price depends on available prices and depth. |
| Limit order | Executes at the specified price or better; any unfilled amount may rest in the book. | Controls the price you will accept, but may not fill, may fill only partly, or may become stale. |
These behaviors are described in Polymarket’s order guide. A limit quote is not a guaranteed spread capture: it may receive no fill, and a fill may occur as the market moves. Inspect depth rather than assuming the midpoint or displayed size is available for your whole order.
Include fees and execution quality in the economics
Polymarket’s fee page, accessed October 7, 2026, listed maker fee rates of 0 for the categories shown and category-level taker fee rates as follows. These are platform-published parameters from that page snapshot, not permanent or universal rates; verify the specific market’s current terms before trading.
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| Category | Listed taker fee rate | Listed maker fee rate |
|---|---|---|
| Crypto | 0.07 | 0 |
| Sports | 0.05 | 0 |
| Finance | 0.04 | 0 |
| Geopolitics | 0 | 0 |
The same page documents the fee formula as fee = C × feeRate × p × (1 - p), where C is shares traded and p is the share price. For a given category fee rate, the dollar fee peaks around a 50% share price and is symmetric around that point. The fee schedule, formula, and maker-rebate information are in Polymarket’s Fees documentation.
Evaluate outcomes after applicable taker fees, any maker rebates actually earned, spread, and execution quality. Do not assume an order will qualify for maker treatment or a rebate merely because it was initially placed as a quote; eligibility depends on current market and program rules.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What to record before claiming a strategy works
A strategy description is not evidence of profitability. To assess an implementation, keep reproducible records that let you distinguish quoting logic from outcomes, including:
- How fair value was estimated and when the estimate changed.
- Filled positions and live-order exposure, including partial fills.
- Quote prices and sizes, market depth at placement, and cancellations or replacements.
- Fees, rebates actually received, and execution prices.
- Results across resolved and unresolved positions, with the evaluation period and method stated.
Without such data and a stated methodology, there is no basis here to claim positive expected returns, realized profitability, or reduced risk for a particular strategy. Polymarket’s trading overview says orders are signed and submitted to its CLOB, and matched trades settle on Polygon; consult the Trading Overview for the platform workflow.
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