{"machine":"compound-interest","slot":"S51","title":"Compound interest calculator","how_to_call":"POST https://innernetcorp.com/machines/compound-interest with Content-Type: application/json","price_usd":"$0.003","currencies":["USDC","EURC"],"payment":"x402: send the POST without payment to receive a 402 with signed requirements; pay any option and retry.","input_example":{"principal":10000,"annual_rate":7,"years":10,"compounds_per_year":12},"input_schema":{"type":"object"},"summary":"Compute compound interest growth: final amount, total interest earned, with any compounding frequency and optional monthly contributions.","catalog":"/catalog"}