{"uid":"cap_RRK3PD3EjCD5-XGaAOv-H","slug":"sindri-compound-interest-calculator-3fd83bb1","name":"Sindri Compound Interest Calculator","description":"Compound interest calculator. Projects the ending value of an investment given a starting principal, monthly contributions, and an annual interest rate, compounded monthly over a chosen number of years.","url":"https://x402.outpimp.com/compoundInterestCalculator","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"years":{"type":"number","description":"Number of years to project (1-100)."},"initialInvestment":{"type":"number","description":"Starting principal."},"annualInterestRate":{"type":"number","description":"Annual interest rate, as a fraction (e.g. 0.07)."},"monthlyContribution":{"type":"number","description":"Recurring monthly contribution."}}},"responseSchema":null,"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_cfZyvWnOw7v8KtsQnoWWl","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":"Projects the ending value of an investment given a starting principal, monthly contributions, and an annual interest rate compounded monthly over a chosen number of years.","exampleAgentPrompt":"If I start with $5,000, contribute $300 a month, and earn 7% annual interest compounded monthly, how much will I have after 25 years?","exampleUseCases":[{"title":"Retirement savings projection","prompt":"I'm 35 and want to retire at 65. If I put $15,000 in today and add $600 a month at a 6% annual return, how much will I have in 30 years?"},{"title":"College fund growth estimate","prompt":"I'm starting a college fund with $2,000 and plan to add $150 a month. Assuming a 5% annual interest rate, what will it be worth in 18 years?"},{"title":"Early FIRE milestone planning","prompt":"If I invest $50,000 now and contribute $1,000 a month at 8% annual interest compounded monthly, what will my portfolio be worth after 15 years?"}],"resultDescription":"Returns the projected ending value of the investment after the specified number of years, computed using monthly compounding on both the initial principal and the recurring monthly contributions.","failureModes":["Missing required parameters (years, initialInvestment, annualInterestRate, or monthlyContribution) may return an error or incomplete result","Out-of-range values (e.g. years > 100 or negative amounts) may cause unexpected results","Payment failure via x402 protocol (insufficient USDC balance) will prevent the call from completing","Providing annualInterestRate as a percentage (e.g. 7 instead of 0.07) will yield incorrect projections"],"whenToPreferThis":"Choose this endpoint when you need a fast, affordable ($0.01 USDC) server-side compound interest projection with monthly compounding and recurring contribution support. Ideal for financial planning agents that need accurate future-value calculations without implementing the math locally. Prefer this over a Coast FIRE or Emergency Fund calculator when the user wants a straightforward investment growth projection rather than a specific FIRE milestone or expense runway.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T18:47:59.489Z","isFirstParty":false}