{"uid":"cap_BCalzvvmhNaRoSZ4BN7B1","slug":"coco-compound-interest-calculator-db1afcb5","name":"CoCo Compound Interest Calculator","description":"Zach Riehn's lab: an about-me and portfolio, a news desk, The Atelier for AI experiments, Launch Lab for XRP research, and Fracture for games.","url":"https://cocoeatsai.com/area4/agent/tools/compound?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input","output"],"properties":{"input":{"type":"object","required":["type","method","queryParams"],"properties":{"type":{"const":"http"},"method":{"enum":["GET"]},"queryParams":{"type":"object","properties":{"years":{"type":"string"},"per_year":{"type":"string"},"principal":{"type":"string"},"monthly_add":{"type":"string"},"annual_rate_pct":{"type":"string"}}}},"additionalProperties":false},"output":{"type":"object","required":["type","example"],"properties":{"type":{"const":"json"},"example":{"type":"object","required":["final_balance"],"properties":{"final_balance":{"type":"number"}}}}}}},"responseSchema":{"type":"json","example":{"note":"Illustration only, not financial advice.","growth":104.94,"contributed":1000,"final_balance":1104.94},"exampleNote":"Computed offline with demonstration inputs; time/random values are illustrative."},"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_BP31DQpBYe-IxEsBijWzd","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":"Calculates compound interest growth over time given a principal, annual rate, monthly additions, and investment period","exampleAgentPrompt":"If I invest $5,000 now and add $150 a month at a 7% annual rate, what will my balance be after 10 years with monthly compounding?","exampleUseCases":[{"title":"Retirement savings projection","prompt":"I'm starting with $10,000 in retirement savings and plan to add $300 a month at a 6% annual interest rate — how much will I have after 30 years with monthly compounding?"},{"title":"College fund growth estimate","prompt":"If I open a college fund with $2,000 today and deposit $100 a month at 5% annual interest, what's the projected balance after 18 years?"},{"title":"Short-term savings goal","prompt":"I have $500 saved up and I'm putting in $50 a month into an account earning 4.5% per year. What will I end up with after 3 years, compounding monthly?"}],"resultDescription":"Returns a JSON object with the final_balance (total value at end of period), contributed (total amount deposited including principal and monthly additions), and growth (interest earned), plus a disclaimer note that it is illustrative and not financial advice.","failureModes":["Missing required query parameters (principal, annual_rate_pct, years) returns an error","Non-numeric string values for numeric fields may cause a computation error","Extremely large values or zero/negative rates may produce unexpected results","Network or server errors return non-200 HTTP status codes"],"whenToPreferThis":"Use this endpoint when you need a quick, deterministic compound interest calculation with support for monthly contributions. It is well-suited for personal finance projections, savings goal modeling, or educational illustrations. Prefer this over a generic calculator when you need a structured JSON response for downstream processing in an agent workflow.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-19T12:44:25.804Z","isFirstParty":false,"canonicalSlug":"coco-compound-interest-calculator-db1afcb5"}