{"name":"market-filter","description":"Filters Polymarket prediction markets by query, category, tag, liquidity, open/closed status, and sort order, on a demand-matching route. Data-only public market research endpoint; no wallet filtering or trade execution. Use it as a Polymarket filter API or market screener.","price":"$0.005","method":"POST","input_schema":{"properties":{"query":{"type":"string","description":"Free-text filter applied to question, description, and slug."},"category":{"type":"string","description":"Filter by Polymarket category substring, 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: 'volume24hr', 'liquidity', 'endDate', or 'startDate'. Omit for default gamma-api order."},"ascending":{"type":"boolean","description":"Sort direction when order is set. Default false (descending)."},"min_liquidity":{"type":"number","description":"Minimum liquidity in USD."}}},"input_example":{"category":"Crypto","min_liquidity":1000,"limit":20},"output_example":{"markets":[{"question":"Will BTC hit a new all-time high?","liquidity_usd":12000}],"count":20},"x402_payment_required":true,"x402_facilitator":"https://api.cdp.coinbase.com/platform/v2/x402"}