{"uid":"cap_XtI72r0URFHph5r_1ZuD0","slug":"x402-polymarket-markets-159edd9c","name":"x402 Polymarket Markets","description":"Search or list active Polymarket prediction markets, ranked by 24h volume","url":"https://x402tap.com/api/polymarket-markets?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","properties":{"q":{"type":"string","description":"Optional keyword filter on the market question"},"limit":{"type":"string","description":"Max markets to return, 1-50 (default 10)"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"count":1,"query":"election","markets":[{"slug":"example-market","active":true,"endDate":"2026-12-31T00:00:00Z","outcomes":["Yes","No"],"question":"Example prediction market?","liquidity":45678.9,"volume24hr":12345.67,"volumeTotal":987654.32,"outcomePrices":[0.62,0.38]}]}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_FpHHhAfW4qFoVN-QV5xC-","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Search or list active Polymarket prediction markets, ranked by 24-hour trading volume","exampleAgentPrompt":"Show me the top Polymarket prediction markets related to elections right now — return up to 20 results ranked by 24-hour volume.","exampleUseCases":[{"title":"Monitor election prediction odds","prompt":"Search Polymarket for any active prediction markets about the US election and show me the current yes/no prices and 24-hour volume for the top 10 results."},{"title":"Track crypto regulatory markets","prompt":"Find me active Polymarket markets related to crypto regulation — I want to see the current outcome prices and how much volume they've done in the last 24 hours, up to 15 markets."},{"title":"Discover top trending prediction markets","prompt":"What are the 20 most actively traded Polymarket markets right now? Just list them by 24-hour volume so I can see what topics people are betting on most."}],"resultDescription":"Returns a JSON object with a count of matched markets and an array of market objects, each including the market question, slug, active status, end date, possible outcomes, current outcome prices (probabilities), 24-hour volume, total volume, and liquidity.","failureModes":["No markets match the keyword query — returns empty markets array","limit parameter out of range (must be 1-50) — may return error or default","Payment not included or insufficient — 402 Payment Required response","Polymarket data source temporarily unavailable — upstream error","Invalid query parameter type — schema validation error"],"whenToPreferThis":"Use this endpoint when you need to discover or search across active Polymarket prediction markets by topic, ranked by recent trading activity. It is best when you want a broad overview or filtered list rather than deep detail on a single market. Prefer this over exchange APIs or news sources when you want quantified crowd-probability estimates on future events. It complements Kalshi endpoints when you want Polymarket-specific liquidity and pricing data.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-12T00:36:36.971Z","isFirstParty":false,"canonicalSlug":"x402-polymarket-markets-159edd9c"}