{"uid":"cap_CQ36nUVFXz7pAKoWr8u49","slug":"rule-of-72-calculator-d1fd052a","name":"Rule of 72 Calculator","description":"Rule Of72","url":"https://minia2a.uk/x402/ruleOf72?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","required":["input"],"properties":{"input":{"type":"object","properties":{"type":{"type":"string"},"method":{"type":"string"},"bodyType":{"type":"string"},"queryParams":{"type":"object"}}},"output":{"type":"object","properties":{"type":{"type":"string"}}}}},"responseSchema":{"type":"json","example":{"ok":true}},"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__4ho3AmRtJpf6TEtdP6lM","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":"Calculates the Rule of 72 — estimates how many years it takes for an investment to double given an annual interest rate, or the rate required to double in a given number of years.","exampleAgentPrompt":"Using the Rule of 72, how many years will it take for my investment to double if I'm earning a 7% annual return?","exampleUseCases":[{"title":"Retirement savings doubling estimate","prompt":"I'm earning about 6% annually on my retirement account — use the Rule of 72 to tell me how many years until my balance doubles."},{"title":"Required rate to hit doubling goal","prompt":"I want to double my money in 9 years — what annual interest rate do I need according to the Rule of 72?"},{"title":"Comparing investment options","prompt":"I'm choosing between two savings accounts, one at 4% and one at 5.5% — can you use the Rule of 72 to show me how much faster my money doubles with the higher rate?"}],"resultDescription":"Returns the Rule of 72 result — either the estimated number of years to double an investment at a given interest rate, or the interest rate needed to double within a given number of years. Output is a straightforward numeric computation result.","failureModes":["Missing or invalid input parameter returns an error","Zero or negative interest rate causes division-by-zero or invalid computation","Non-numeric input for rate or years returns a validation error","Service unavailability returns HTTP 402 or 5xx error"],"whenToPreferThis":"Choose this endpoint when you need a quick, lightweight financial doubling-time calculation using the Rule of 72 heuristic, without needing full compound interest simulation or amortization schedules. Ideal for fast financial planning estimates in agentic workflows that have already integrated x402 micropayment handling.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-12T18:42:20.055Z","isFirstParty":false,"canonicalSlug":"rule-of-72-calculator-d1fd052a"}