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Dev.to
7/13/2026
Building a Polymarket Trading Bot: Order Book Monitoring, Slippage Handling, and Position Sizing in Python

Building a Polymarket Trading Bot: Order Book Monitoring, Slippage Handling, and Position Sizing in Python

Short summary

A practical Python guide to building a Polymarket trading bot covers market discovery via the Gamma API, order book reading, edge calculation against model probability, and fractional Kelly position sizing with hard exposure caps. It addresses partial fills and slippage by checking available depth before ordering, and recommends adaptive polling frequency over flat intervals to conserve API rate limits.

  • •Discover markets and read order books via py_clob_client and Gamma API
  • •Fractional Kelly sizing with max_position_pct cap prevents single-market blowups
  • •Check fillable depth before ordering; use resting limit orders in thin books

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