{"uid":"cap_bVQrX9RdznTcvZWPVlYdX","slug":"delx-fibonacci-03b4326e","name":"Delx Fibonacci","description":"Nth Fibonacci (n≤78). Use for sequences, demos, or test fixtures without shipping a math package. Returns F(n) for n up to 78 with a structured receipt. $0.001 USDC per successful call via x402 on Base—deterministic first-party JSON, no API key, no subscription, and nothing is billed on structured validation errors.","url":"https://api.delx.ai/api/v1/x402/fibonacci","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"n":{"type":"integer","description":"Integer input (see tool summary for allowed range)."}}},"responseSchema":{"type":"json","example":{"n":42,"value":267914296,"schema":"delx/fibonacci/v1"}},"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_ZLAqGPJl5lAhg2BGvSDrP","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 Nth Fibonacci number for integer n up to 78, returning a structured JSON receipt for a micropayment of $0.001 USDC.","exampleAgentPrompt":"What is the 42nd Fibonacci number? Just give me F(42) as a clean structured result.","exampleUseCases":[{"title":"Test fixture seed generation","prompt":"I need a deterministic integer seed for my test suite — can you get me the 30th Fibonacci number as a structured result?"},{"title":"Educational sequence demo","prompt":"Can you show me the Fibonacci value at position 20 to use as a live demo in my math lesson?"},{"title":"Validating a math library output","prompt":"My code says F(55) is 139583862445 — can you confirm the correct 55th Fibonacci number so I can check if that's right?"}],"resultDescription":"Returns a structured JSON object containing the input index n, the computed Fibonacci value F(n), and a receipt confirming the successful call. No extraneous data; deterministic and consistent across calls for the same n.","failureModes":["n out of range (n > 78 or n < 0): returns a structured validation error and no charge is applied","non-integer input for n: returns a validation error with no billing","missing n field: returns a structured error, no charge","payment failure or insufficient USDC balance: call does not proceed"],"whenToPreferThis":"Choose this endpoint when you need a reliable, server-side computation of a Fibonacci number without shipping or maintaining a math library in your agent's runtime. Ideal for test fixtures, demos, or pipeline steps that need a deterministic integer value. Prefer it over local computation when you want a first-party signed receipt to prove the result. Not suited for computing sequences beyond index 78 or for bulk generation of many Fibonacci numbers in a single call.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T19:02:32.375Z","isFirstParty":false}