{"name":"polymarket-markets","description":"Lists live Polymarket prediction markets from gamma-api, with filters for category, tag, free-text query, and 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. Use it as a Polymarket API, prediction market data feed, crypto-settled betting odds source, event odds lookup, or Polymarket browse endpoint.","price":"$0.005","method":"POST","input_schema":{"properties":{"query":{"type":"string","description":"Free-text filter applied to question + description + slug. Case-insensitive substring match against the current page."},"category":{"type":"string","description":"Filter by Polymarket category (substring match, e.g. 'Sports', 'Crypto', 'Politics')."},"tag":{"type":"string","description":"Polymarket tag slug filter, passed through to upstream."},"active":{"type":"boolean","description":"Default true. Pass false to include inactive markets."},"closed":{"type":"boolean","description":"Default false. Pass true to include closed markets."},"limit":{"type":"number","description":"1-100. Default 20."},"offset":{"type":"number","description":"Pagination offset."},"order":{"type":"string","enum":["volume24hr","liquidity","endDate","startDate"],"description":"Sort field."},"ascending":{"type":"boolean","description":"Sort direction."},"min_liquidity":{"type":"number","description":"Minimum liquidity in USD."}}},"input_example":{"query":"election","active":true,"closed":false,"limit":10,"min_liquidity":1000},"output_example":{"markets":[{"id":"12345","slug":"will-x-happen-by-y","question":"Will X happen by Y?","outcomes":["Yes","No"],"outcome_prices":[0.42,0.58],"volume_24hr_usd":50000,"liquidity_usd":12000,"end_date":"2026-12-31T12:00:00Z"}],"count":10,"attribution":"Data: Polymarket gamma-api. https://polymarket.com"},"x402_payment_required":true,"x402_facilitator":"https://api.cdp.coinbase.com/platform/v2/x402"}