{"uid":"cap_NXv9XeOwMWSTeqwCTpwpS","slug":"delx-binary-fair-price-ed2e6718","name":"Delx Binary Fair Price","description":"Map a true probability into a binary contract fair price in [0,1]. Call when pricing yes/no markets from your probability model. Returns fair price in [0,1] as deterministic JSON for $0.001 USDC via x402 on Base. First-party local math only—no RPC, live market feed, API keys, storage, or mediagen. Advisory only; the caller owns capital, risk, and production controls.","url":"https://api.delx.ai/api/v1/x402/binary-fair-price","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"prob":{"type":"number","description":"Input field: prob."}}},"responseSchema":{"type":"json","example":{"prob":0.37,"schema":"delx/util-binary-fair-price/v1","fair_price":0.37}},"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_HhHSWWGgh30PSMdlXF3ZA","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":"Computes the fair (breakeven) price for a binary outcome given its probability, suitable for pricing binary options or bets.","exampleAgentPrompt":"What's the fair price for a binary outcome that has a 37% chance of happening?","exampleUseCases":[{"title":"Pricing a prediction market contract","prompt":"I'm running a prediction market where the community gives a 62% chance of this event occurring — what's the fair price I should set for the binary contract?"},{"title":"Valuing a binary options trade","prompt":"I'm considering a binary options trade where I estimate the underlying has a 45% probability of finishing in the money — what's the fair breakeven price I should pay?"},{"title":"Calibrating agent reward signals","prompt":"My agent is computing payout amounts for a binary success/failure task with an estimated 80% success probability — what's the fair price it should charge per unit?"}],"resultDescription":"Returns a JSON object containing the echoed input probability, the computed fair price (numerically equal to the probability for a binary contract, i.e. expected value), and a schema identifier string ('delx/util-binary-fair-price/v1') confirming the calculation schema used.","failureModes":["Probability value outside [0,1] range may return a validation error or unexpected result","Missing 'prob' field in request body returns an error","Non-numeric value for 'prob' causes a schema validation failure","Network or service unavailability returns a 5xx error"],"whenToPreferThis":"Use this endpoint when you need to quickly compute the theoretical fair (expected-value) price for a binary outcome from a raw probability — especially useful in prediction markets, binary options pricing, or any agent workflow that must translate a probability estimate into a fair-value monetary amount without implementing the math locally.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T07:14:50.439Z","isFirstParty":false}