{"uid":"cap_zhDqo-YWGGa4RcCc1QgMe","slug":"polynews-news-ce99ce41","name":"polynews.news Polymarket-Kalshi Arbitrage Detection","description":"Cross-platform arbitrage detection between Polymarket and Kalshi: matched markets, price spreads, fee-adjusted EV. Coverage: liquid Polymarket markets in politics/geopolitics/elections/tech/economy/finance; low-volume long-tail, sports, culture, and weather are not included.","url":"https://polynews.news/api/v1/arbitrage","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":{"limit":{"type":"string"},"category":{"type":"string"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"data":{"type":"object","properties":{"opportunities":{"type":"array","items":{"type":"object","properties":{"arbitrage":{"type":"object","properties":{"type":{"type":"string","description":"e.g. BUY_YES_POLY_NO_KALSHI"},"spreadNet":{"type":"number","description":"After fees"},"spreadRaw":{"type":"number"},"confidence":{"type":"string","description":"high | medium | low"},"impliedProfit":{"type":"number","description":"Fee-adjusted EV"}},"description":"Fee-adjusted arb calc"},"kalshiTitle":{"type":"string"},"kalshiYesAsk":{"type":"number"},"matchConfidence":{"type":"number"},"polymarketQuestion":{"type":"string"},"polymarketYesPrice":{"type":"number"}}}},"matchedMarkets":{"type":"number"}}}}}}}}},"responseSchema":{"type":"json","example":{"data":{"computedAt":"2026-05-12T04:25:00.000Z","opportunities":[{"spreadRaw":0.09,"kalshiPrice":0.41,"kalshiTitle":"BTC at or above $200,000 by Dec 31, 2026","expectedValue":0.052,"matchConfidence":0.87,"polymarketPrice":0.32,"recommendedSide":"BUY polymarket / SELL kalshi","polymarketQuestion":"Will Bitcoin reach $200K by Dec 31, 2026?"}],"matchedMarkets":73,"kalshiDataAgeSec":45,"totalPolymarkets":1074,"totalKalshiMarkets":13802,"polymarketDataAgeSec":30},"meta":{"tier":"alpha","version":"v1","endpoint":"/api/v1/arbitrage","latencyMs":1240,"timestamp":"2026-05-12T04:30:00.000Z"}}},"example":{"request":{"input":{"type":"http","method":"GET","queryParams":{"limit":"10","category":"politics"}}},"response":{"data":{"computedAt":"2026-06-03T23:08:38.844Z","opportunities":[{"id":"448148__KXVENEZDEFACTO-27JAN01-GLOP","arbitrage":{"type":"BUY_YES_KALSHI_NO_POLY","spreadNet":0.0175,"spreadRaw":0.0375,"confidence":"medium","feeEstimate":0.02,"impliedProfit":0.0175},"updatedAt":"2026-06-03T23:08:38.843Z","kalshiNoAsk":1,"kalshiNoBid":0.99,"kalshiTitle":"Will Gustavo González López de facto hold head of state of Venezuela at the end of 2026?","categoryPoly":"politics","kalshiTicker":"KXVENEZDEFACTO-27JAN01-GLOP","kalshiYesAsk":0.01,"kalshiYesBid":0,"polymarketId":"448148","closeTimePoly":"2026-12-31T00:00:00Z","categoryKalshi":"unknown","isMultiOutcome":true,"closeTimeKalshi":"2027-01-02T04:59:00.000Z","kalshiLastPrice":0.01,"matchConfidence":0.68,"kalshiEventTicker":"KXVENEZDEFACTO-27JAN01","kalshiYesSubtitle":"Gustavo González López","polymarketNoPrice":0.9525,"kalshiSeriesTicker":"KXVENEZDEFACTO","polymarketQuestion":"Venezuela de facto leader end of 2026?","polymarketYesPrice":0.0475,"polymarketOutcomeId":"2155257","polymarketOutcomeName":"No Head of State"},{"id":"448148__KXVENEZDEFACTO-27JAN01-DROD","arbitrage":{"type":"BUY_YES_POLY_NO_KALSHI","spreadNet":0,"spreadRaw":0.02,"confidence":"low","feeEstimate":0.02,"impliedProfit":0},"updatedAt":"2026-06-03T23:08:38.843Z","kalshiNoAsk":0.1,"kalshiNoBid":0.06,"kalshiTitle":"Will Delcy Rodríguez de facto hold head of state of Venezuela at the end of 2026?","categoryPoly":"politics","kalshiTicker":"KXVENEZDEFACTO-27JAN01-DROD","kalshiYesAsk":0.94,"kalshiYesBid":0.9,"polymarketId":"448148","closeTimePoly":"2026-12-31T00:00:00Z","categoryKalshi":"unknown","isMultiOutcome":true,"closeTimeKalshi":"2027-01-02T04:59:00.000Z","kalshiLastPrice":0.91,"matchConfidence":0.74,"kalshiEventTicker":"KXVENEZDEFACTO-27JAN01","kalshiYesSubtitle":"Delcy Rodríguez","polymarketNoPrice":0.12,"kalshiSeriesTicker":"KXVENEZDEFACTO","polymarketQuestion":"Venezuela de facto leader end of 2026?","polymarketYesPrice":0.88,"polymarketOutcomeId":"2155243","polymarketOutcomeName":"Delcy Rodríguez"}],"matchedMarkets":10,"kalshiDataAgeSec":4268,"totalPolymarkets":122,"totalKalshiMarkets":10197,"polymarketDataAgeSec":7816},"meta":{"tier":"alpha","version":"v1","endpoint":"/api/v1/arbitrage","latencyMs":623,"timestamp":"2026-06-03T23:08:38.845Z"}}},"exampleRequest":{"limit":"10","category":"politics"},"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","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_HxOA6gnXMVxakq_NjL3YU","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":"Detects cross-platform arbitrage opportunities between Polymarket and Kalshi by matching markets, computing price spreads, and calculating fee-adjusted expected value","exampleAgentPrompt":"Show me the top 10 arbitrage opportunities right now between Polymarket and Kalshi — I want to see matched markets, the price spreads, and the fee-adjusted expected value for each.","exampleUseCases":null,"resultDescription":"Returns a list of arbitrage opportunities with matched market pairs, raw price spreads between Polymarket and Kalshi, fee-adjusted expected value (EV) for each opportunity, the Polymarket question text, and the Kalshi market title. Also includes a count of total matched markets found.","failureModes":["No matched markets found if category filter is too narrow","Empty opportunities array if no price divergence currently exists","Rate limiting or payment failure for the $0.01 USDC per-call fee","Invalid category parameter returns empty or error response","Stale data if market prices were recently updated on either platform"],"whenToPreferThis":"Use this endpoint when you need real-time, fee-adjusted arbitrage signals specifically between Polymarket and Kalshi. Prefer it over manually querying each platform's API separately, or when you need pre-matched market pairs with EV already calculated rather than raw price feeds.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T12:31:19.872Z","isFirstParty":false}