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Market making

7 public market making examples on Kalshi and Polymarket, each with its source.

Last updated .

Market makers quote both sides of a market, posting buy and sell limit orders and earning the spread while managing inventory. Entries here include reference implementations and research code.

Common tools here: Python (6), Polymarket CLOB (2), Kalshi API (1), Jupyter (1), uv (1). Compare them side by side → · Kalshi bot guide · Polymarket bot guide

Market makingKalshi

Kalshi weather market making: NYC high-temperature replay and live trader

Columbia APMA seminar project that quotes Kalshi's daily New York high-temperature contracts: post-only bids and asks around rescaled mids, with inventory priced jointly across temperature bins, quiet periods around weather station reports, and a replay against Kalshi's public trade tape plus Iowa Environmental Mesonet data. Replay results are the author's own (self-reported).

PythonuvKalshi public API+1
dfong03 · Added Oct 20, 2026 · ★ 0Source ↗ (opens Kalshi weather market making: NYC high-temperature replay and live trader source)
Market makingPolymarket

Polymarket market-making research with documented null results

Two closed research projects: simulated (shadow) market making against Polymarket's live order book and recorded tape, and an event study of whether public posts move prices in a capturable way. The repo places no orders and reports its negative results with the tests behind them; findings are the author's own (self-reported). Research logs are in Spanish, code in English.

PythonPolymarket CLOB APIstatistical testing
martinjmz97 · Added Oct 20, 2026 · ★ 0Source ↗ (opens Polymarket market-making research with documented null results source)
Market makingPolymarket

Polymarket Market Maker Lab: paper trading, backtests and a quoting prototype

Experimental Python workspace for studying order books and passive quotes on Polymarket short-duration markets. Includes a Tkinter paper-trading engine that simulates fills against live public data, a backtest window, and an unaudited live CLOB prototype. The author states it is a research prototype, not a validated profitable strategy.

PythonTkinterPolymarket CLOB client
brianlibooks-del · Added Oct 21, 2026 · ★ 0Source ↗ (opens Polymarket Market Maker Lab: paper trading, backtests and a quoting prototype source)
Market makingPolymarket

polymarket-clob-infra: Rust order book, feed merge and EIP-712 signing for Polymarket's CLOB

Strategy-free infrastructure pulled from a Rust Polymarket market maker: an atomic order-book snapshot, merging of redundant websocket feeds, per-connection lag detection, EIP-712 order signing, and an execution ledger checked against on-chain receipts. Strategy and risk logic are not included. MIT licensed, with CI.

RustPolymarket CLOBWebSockets+1
38st · Added Oct 22, 2026 · ★ 0Source ↗ (opens polymarket-clob-infra: Rust order book, feed merge and EIP-712 signing for Polymarket's CLOB source)

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