Polymarket markets / prediction market data / Polymarket API / list active prediction markets / crypto-settled betting odds / event odds / Polymarket browse. Pulls live Polymarket markets from gamma-api with filter by category, tag, free-text query, minimum liquidity. Returns market question, current YES/NO outcome prices (implied probabilities), 24-hr volume, liquidity, end date. DATA-ONLY — no trading. Useful for agent forecasting research and arbitrage detection.