{"uid":"cap_MvM884NGWr10tT_b07B1l","slug":"ioswarm-prediction-markets-feed-c301f3d4","name":"ioswarm Prediction Markets Feed","description":"The most-traded prediction markets right now on Polymarket and Kalshi, ranked by 24-hour volume: the market-implied probability for each outcome, its 24-hour change, volume, liquidity and close date, with links. One call instead of paging two exchanges' APIs. Rebuilt every hour. $0.01 per call, no account. Free 24h-delayed sample: GET https://ioswarm.io/api/v1/feeds/prediction-markets/sample.","url":"https://ioswarm.io/api/v1/feeds/prediction-markets?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"q":{"type":"string","maxLength":80,"description":"Text filter."},"at":{"type":"string","description":"Past edition: RFC 3339 or YYYY-MM-DD."},"date":{"type":"string","description":"YYYY-MM-DD (UTC)."},"limit":{"type":"integer","maximum":200,"minimum":1,"description":"Items per section."},"ticker":{"type":"string","description":"Ticker/symbol filter."},"section":{"enum":["polymarket","kalshi"],"type":"string","description":"One section (default: all)."}}},"responseSchema":null,"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_ZpG5RhM-Ltblmsq76z7J6","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":"Returns the most-traded prediction markets on Polymarket and Kalshi ranked by 24-hour volume, with market-implied probabilities, price changes, liquidity, and close dates","exampleAgentPrompt":"Show me the top 20 most-traded prediction markets right now across both Polymarket and Kalshi — I want the current market-implied probabilities, 24-hour changes, and when each market closes.","exampleUseCases":[{"title":"Tracking political election odds","prompt":"What are the current market-implied probabilities on Polymarket and Kalshi for the top political markets right now? Show me the 10 highest-volume ones and how the odds have shifted in the last 24 hours."},{"title":"Monitoring a specific market ticker","prompt":"Pull up the latest prediction market data for the ticker 'TRUMP-WIN' across Polymarket and Kalshi — I want the current probability, 24-hour change, volume, and close date."},{"title":"Daily prediction market briefing","prompt":"Give me today's top 15 most-liquid prediction markets on Kalshi only, ranked by 24-hour volume, so I can see where the action is and what probabilities the market is pricing in."}],"resultDescription":"A ranked list of the most-traded prediction markets from Polymarket and/or Kalshi, including each market's name, ticker, market-implied probability for each outcome, 24-hour probability change, 24-hour trading volume, available liquidity, and market close date — optionally filtered by platform, keyword, or ticker symbol.","failureModes":["Invalid date format returns error — must use RFC 3339 or YYYY-MM-DD","Ticker filter with no matching markets returns empty results","Section value outside 'polymarket' or 'kalshi' enum causes validation error","Limit exceeding 200 or below 1 returns validation error","Past edition date too far back may return no archived data","Payment not received (x402) results in 402 Payment Required response"],"whenToPreferThis":"Choose this endpoint when you need real-time, volume-ranked prediction market data from both Polymarket and Kalshi in a single call, especially when you want market-implied probabilities with 24-hour momentum data. Prefer this over scraping individual market pages or general news APIs when you specifically need structured probability, liquidity, and volume metrics for event-driven forecasting or trading research.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T18:31:12.601Z","isFirstParty":false,"canonicalSlug":"ioswarm-prediction-markets-feed-c301f3d4"}