{"ok":true,"tool":"Compound Interest Calculator","operation":"calculate-compound-interest","description":"Calculate compound interest with optional regular contributions.","method":"POST","endpoint":"/api/compound-interest-calculator","webUrl":"https://ultraquick.tools/tools/compound-interest-calculator","parameters":{"type":"object","properties":{"principal":{"type":"number","description":"Initial investment amount"},"annualRate":{"type":"number","description":"Annual interest rate as a percentage"},"years":{"type":"number","description":"Investment term in years"},"compoundsPerYear":{"type":"integer","description":"Compounding frequency per year (default 12)"},"contributions":{"type":"number","description":"Regular contribution amount (default 0)"},"contributionFreq":{"type":"string","enum":["monthly"],"description":"Contribution frequency (default monthly)"}},"required":["principal","annualRate","years"]},"response":{"type":"object","properties":{"totalBalance":{"type":"number"},"totalContributions":{"type":"number"},"totalInterest":{"type":"number"},"years":{"type":"number"}}},"example":{"request":{"principal":10000,"annualRate":7,"years":10,"contributions":100},"response_shape":{"type":"object","properties":{"totalBalance":{"type":"number"},"totalContributions":{"type":"number"},"totalInterest":{"type":"number"},"years":{"type":"number"}}}},"howToCall":"POST a JSON body to https://ultraquick.tools/api/compound-interest-calculator. Returns {\"ok\":true,\"result\":{...}} on success or {\"ok\":false,\"error\":\"...\"} on failure. No auth, CORS-enabled.","parametersSummary":"  principal (number, required) — Initial investment amount\n  annualRate (number, required) — Annual interest rate as a percentage\n  years (number, required) — Investment term in years\n  compoundsPerYear (integer, optional) — Compounding frequency per year (default 12)\n  contributions (number, optional) — Regular contribution amount (default 0)\n  contributionFreq (string, optional, one of: monthly) — Contribution frequency (default monthly)","curlExample":"curl -X POST https://ultraquick.tools/api/compound-interest-calculator -H \"Content-Type: application/json\" -d '{\"principal\":10000,\"annualRate\":7,\"years\":10,\"contributions\":100}'"}