{"uid":"cap_M9XgqLaiQneHBFtCS6bCo","slug":"x402-factory-odds-compare-c346bcc8","name":"x402-factory Odds Compare","description":"Paid data APIs for AI agents: prediction-market analytics, weather intelligence, weather×market edge signals, and SEC/gov data. Paid endpoints use the x402 protocol (HTTP 402 + USDC on Base): call without payment to receive requirements, retry with an X-PAYMENT header. Machine-readable catalog: /llms.txt. Per-endpoint docs: /docs/{id}.","url":"https://x402-factory.com/v1/odds/compare/%7Bslug%7D","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"properties":{"type":"string"}}},"responseSchema":{"type":"json","example":{"data":{"per_venue":[{"venue":"kalshi","implied_p":0.5965,"vig_adjusted_p":0.5985,"depth_within_1c_usd":23836.81,"depth_within_5c_usd":80347.82},{"venue":"polymarket","implied_p":0.5702,"vig_adjusted_p":0.5716,"depth_within_1c_usd":30913.64,"depth_within_5c_usd":123491.05}],"venue_spread":0.0263,"disagreement_flag":false},"meta":{"docs":"https://x402-factory.com/docs/probability.odds-compare","sources":["kalshi","polymarket"],"version":"1.0.0","endpoint":"/v1/odds/compare/{slug}","data_mode":"live","freshness":"realtime","request_id":"req_00000000","generated_at":"2026-08-21T03:58:58.156Z"}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","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":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_rSfAWbghHuMJOO2tBlJeA","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Compares implied and vig-adjusted probabilities for a prediction market event across multiple venues (Kalshi, Polymarket) with liquidity depth data.","exampleAgentPrompt":"Compare the current odds on Kalshi and Polymarket for the 2024 US presidential election market — I want to see the vig-adjusted probabilities and whether there's a significant spread between the two venues.","exampleUseCases":[{"title":"Arbitrage opportunity scanner","prompt":"Check if there's a meaningful disagreement right now between Kalshi and Polymarket on the Fed rate cut market — show me the vig-adjusted probabilities and the spread."},{"title":"Best-venue trade execution","prompt":"I want to buy the YES side of the 'US recession 2025' market. Tell me which venue has the better price — compare Kalshi and Polymarket vig-adjusted odds for that slug."},{"title":"AI agent portfolio probability update","prompt":"Pull the latest cross-venue probability for the 'Trump wins 2024' prediction market slug and tell me if the venues disagree by more than 2 percentage points."}],"resultDescription":"Returns per-venue implied and vig-adjusted probabilities, order book liquidity depth within 1¢ and 5¢ in USD for each venue (Kalshi, Polymarket), the spread between venues, and a boolean disagreement flag. Also includes metadata with data freshness timestamp, sources, and request ID.","failureModes":["Unknown or invalid slug returns 404 or empty data","Payment not included returns HTTP 402 with payment requirements in headers","Stale or unavailable market data may return reduced venue coverage","Rate limiting or USDC payment failure on Base network causes request rejection","Market slug format mismatch causes parameter parsing errors"],"whenToPreferThis":"Choose this endpoint when you need real-time, cross-venue probability comparison with liquidity depth for a specific prediction market event. It is ideal for arbitrage detection, best-execution routing, and probability normalization workflows. Prefer it over single-venue APIs when venue disagreement or vig-adjusted accuracy matters.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-12T12:30:02.717Z","isFirstParty":false}