{"uid":"cap_uTc7sgA4HnBsCozsp0Bx6","slug":"polymarket-vs-kalshi-yes-price-spread-lookup-66255f49","name":"Polymarket vs Kalshi Yes-Price Spread Lookup","description":"Exact Polymarket and Kalshi yes prices for one topic. Pass ?q= as keywords, or omit q for the widest live gap. Returns gapCents, the cheaper venue, the Kalshi ticker and URL, and the Polymarket slug and URL. This is the mid-price gap. The cents left after you buy the ask and sell the bid are the net read. $0.001 USDC. The hour pass covers it.","url":"https://aizamon.com/x402/v1/spread?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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","HEAD","DELETE"],"type":"string"},"headers":{"type":"object","additionalProperties":{"type":"string"}},"queryParams":{"type":"object","properties":{"q":{"type":"string","description":"Market topic keywords. Omit for the top live gap."}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"ok":{"type":"boolean"},"sku":{"type":"string"},"result":{"type":"object"},"protocol":{"type":"string"}},"additionalProperties":true}}}}},"responseSchema":{"type":"json","example":{"ok":true,"sku":"SKU_AG_SPREAD_01","result":{"spread":{"query":"openai ipo","topic":"Will Anthropic or OpenAI IPO first?","kalshi":{"url":"https://kalshi.com/…","yes":0.42,"ticker":"…"},"gapCents":8,"cheaperOn":"kalshi","polymarket":{"url":"https://polymarket.com/…","yes":0.5,"slug":"…"}},"product":"Cross-venue Spread — exact tick"},"protocol":"x402"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","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":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_2dxZ37Kh7RLnqVgOaTUdf","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns the yes-price spread between Polymarket and Kalshi for a given prediction market topic, identifying the cheaper venue and providing deep links.","exampleAgentPrompt":"What's the yes-price spread between Polymarket and Kalshi for the 2024 US election winner market — which venue is cheaper and by how much?","exampleUseCases":[{"title":"Arbitrage opportunity scanner","prompt":"Check the yes-price spread between Polymarket and Kalshi for the Fed rate cut market — I want to know which venue is cheaper, the exact prices, and links so I can act fast."},{"title":"Pre-trade venue selection","prompt":"Before I buy yes shares on the Trump 2024 presidential win market, can you tell me whether Polymarket or Kalshi has the lower yes price right now and by how many cents?"},{"title":"Top gap discovery","prompt":"I don't have a specific market in mind — just show me whichever Polymarket vs Kalshi market has the biggest yes-price spread right now so I can see where the best arbitrage opportunity is."}],"resultDescription":"Returns the exact yes prices on both Polymarket and Kalshi, the gap in cents between them, which venue is cheaper, and direct deep links to both market pages — all in a single composable read.","failureModes":["No matching market found for the given topic query — returns empty or null result","Topic query too ambiguous to resolve to a unique market on both venues","One or both venues may not have a listed market for the query, resulting in partial data","Network or upstream API errors from Polymarket or Kalshi data sources","Payment failure or x402 authorization issue preventing the call from completing"],"whenToPreferThis":"Choose this endpoint when you need a quick, cheap ($0.01) single-market yes-price comparison between Polymarket and Kalshi, especially for spot-checking a specific topic or finding the top gap opportunity without paying for a bulk arbitrage pack. Prefer the $0.89 pack endpoint if you need the top 5 gaps with fee-adjusted net edge data instead.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-20T06:38:12.759Z","isFirstParty":false,"canonicalSlug":"polymarket-vs-kalshi-yes-price-spread-lookup-66255f49"}