{"uid":"cap_xtHhXTbJfZf43Bh0_bs1G","slug":"btc-kalshi-polymarket-arbitrage-monitor-x402-c1ead06d","name":"BTC Kalshi-Polymarket Arbitrage Monitor (x402)","description":"Pay-per-call market-data API for matched Kalshi and Polymarket US BTC 15-minute BRTI contracts. x402 v2, Base mainnet USDC.","url":"https://browser-worker-v2-production.up.railway.app/api/btc-kalshi-polymarket-arbitrage?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"request_id":{"type":"string","description":"Optional client correlation identifier, echoed as requestId in the JSON response."}}},"responseSchema":{"type":"object"},"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_rEc9MieTsOqac0sGOfhdE","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 matched Kalshi and Polymarket US BTC 15-minute BRTI contract data to surface real-time arbitrage opportunities between the two prediction markets.","exampleAgentPrompt":"Pull the latest matched BTC 15-minute BRTI contract prices from both Kalshi and Polymarket and tell me if there's an arbitrage spread worth acting on right now.","exampleUseCases":[{"title":"Real-time arb opportunity scanner","prompt":"Check the current Kalshi and Polymarket BTC BRTI contract prices and tell me if there's a meaningful spread I could arb between the two markets right now."},{"title":"Automated prediction market bot","prompt":"Every minute, fetch the latest matched BTC 15-minute BRTI quotes from Kalshi and Polymarket and alert me whenever the spread exceeds 2 cents — use request ID 'bot-run-001' so I can track the calls."},{"title":"Crypto trading research dashboard","prompt":"I'm building a report on Bitcoin prediction market efficiency — can you grab the current matched Kalshi vs Polymarket BRTI contract data so I can see how closely the two markets are aligned?"}],"resultDescription":"A JSON object containing matched BTC 15-minute BRTI contract data from both Kalshi and Polymarket, including contract prices, implied probabilities or values, spread information, and optionally the echoed requestId for correlation. Enables side-by-side comparison to identify arbitrage opportunities.","failureModes":["Payment not received or USDC transaction fails — endpoint returns HTTP 402 and no data","Kalshi or Polymarket API is down — endpoint may return partial data or an error indicating upstream unavailability","No matched contracts found for the current 15-minute window — response may be empty or indicate no active matching contracts","Invalid request_id format — likely echoed as-is but may cause unexpected correlation issues","Rate limiting or Railway infrastructure outage — HTTP 5xx response"],"whenToPreferThis":"Use this endpoint when you need real-time, matched BTC 15-minute BRTI contract pricing from both Kalshi and Polymarket in a single call, specifically to identify arbitrage opportunities. Prefer this over scraping each market independently when you need pre-matched contract pairs and want to pay only per call via x402 micropayments rather than managing API subscriptions to both platforms separately.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-19T12:32:09.933Z","isFirstParty":false,"canonicalSlug":"btc-kalshi-polymarket-arbitrage-monitor-x402-c1ead06d"}