{"uid":"cap_NgtS2XT2jqsSB0mIwwFtU","slug":"sports-calculators-betting-odds-converter-kelly-calculator-6221478d","name":"Sports Calculators – Betting Odds Converter & Kelly Calculator","description":"Convert American, decimal, fractional odds and probability; add the other side for margin, or your own chance for Kelly.","url":"https://sports-calc.x402tookit.com/betting-odds?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"],"type":"string"},"queryParams":{"type":"object","required":["odds","format"],"properties":{"odds":{"type":"string","description":"The odds, e.g. -110, 2.5, 5/2 or 0.4"},"format":{"type":"string","description":"american, decimal, fractional or probability"},"otherSideOdds":{"type":"string","description":"Odds of the opposing outcome in the same format, to measure the bookmaker margin"},"yourProbability":{"type":"number","description":"Your own win probability 0 to 1, for the Kelly fraction"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"asOf":{"type":["null","string"]},"source":{"type":["null","string"]},"decimal":{"type":["null","number"]},"reasons":{"type":["array","null"],"items":{"type":"string"}},"summary":{"type":["null","string"]},"verdict":{"type":["null","string"]},"american":{"type":["null","string"]},"degraded":{"type":["boolean","null"]},"overround":{"type":["null","number"]},"disclaimer":{"type":["null","string"]},"fractional":{"type":["null","string"]},"notChecked":{"type":["array","null"],"items":{"type":"string"}},"noVigProbability":{"type":["null","number"]},"otherSideDecimal":{"type":["null","number"]},"otherSideImplied":{"type":["null","number"]},"profitPer100Stake":{"type":["null","number"]},"bookmakerMarginPct":{"type":["null","number"]},"impliedProbability":{"type":["null","number"]},"noVigProbabilityOtherSide":{"type":["null","number"]}}}}}}},"responseSchema":null,"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_un1nkMk-W38d3Q-eSGbqR","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":"Converts betting odds between American, decimal, fractional, and probability formats; optionally computes bookmaker margin and Kelly Criterion stake fraction.","exampleAgentPrompt":"Convert American odds of -110 to decimal and fractional formats, show me the implied probability, and since the other side is also -110 tell me what the bookmaker's margin is.","exampleUseCases":[{"title":"Odds format conversion for parlay builder","prompt":"I've got odds of 5/2 in fractional format — can you convert that to decimal and American, and tell me the implied probability?"},{"title":"Bookmaker margin check before placing a bet","prompt":"The sportsbook has Team A at -120 and Team B at +100 in American odds — what's the bookmaker margin on this market?"},{"title":"Kelly Criterion stake sizing","prompt":"The odds are 2.5 in decimal format and I think my actual win probability is 0.48 — what fraction of my bankroll should I bet according to Kelly?"}],"resultDescription":"Returns the odds expressed in all four formats (American, decimal, fractional, probability), the implied probability, the no-vig fair probability, profit per 100 stake, and — when the other side's odds are supplied — the overround/bookmaker margin percentage and no-vig probability for both sides. If a personal win probability is supplied, a Kelly Criterion fraction is also included.","failureModes":["Missing required 'odds' or 'format' query parameters returns an error","Odds value inconsistent with stated format (e.g. a negative decimal) causes a validation error","'otherSideOdds' in a different format than 'format' produces incorrect margin","yourProbability outside [0,1] returns a validation error","Very long or non-numeric odds strings may be rejected"],"whenToPreferThis":"Choose this endpoint when you need fast, pure-math odds conversion or Kelly sizing without any live data feed. It is ideal for pre-bet analysis, building a parlay calculator, checking bookmaker fairness, or sizing wagers from a bankroll management model. It is NOT appropriate for fetching live odds from a sportsbook — it only does mathematical transformation of odds you already have.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T07:20:33.456Z","isFirstParty":false,"canonicalSlug":"sports-calculators-betting-odds-converter-kelly-calculator-6221478d"}