Rebuilt Polymarket API starter exposed one-sided order books in 3 of top 20 markets

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A developer tested an AI-generated Python starter for Polymarket's international order book by running it on public data from October 25, 2026. The toolkit reads markets through the Gamma, CLOB and Data API hosts and runs with no wallet or API key, and most of its checks matched Polymarket's own SDK and fee documentation. However, the book-reading code crashed every cycle on three of the top 20 markets by 24-hour volume, which had empty bid or ask sides. Those markets, which included a Dota 2 match, a CS2 match and a Russia-Ukraine diplomacy market, were still active, and the failure came from the original prompt not handling an empty side. The author revised the prompt to address the one-sided books after the test.

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