{"slug":"loan-payment","name":"Loan Payment","category":"fortune","tags":["protecting","planning","spending"],"tagline":"Monthly payment, total interest, and what paying extra saves.","endpoint":"https://xearno.tools/api/v1/tools/loan-payment","page":"https://xearno.tools/t/loan-payment","description":"Standard amortized loan math: monthly payment, total cost, interest as a share of principal — plus a concrete extra-payment scenario showing time and interest saved.","inputSchema":{"type":"object","properties":{"amount":{"description":"Loan amount","type":"number","minimum":1,"default":300000},"rate":{"description":"Annual interest rate (%)","type":"number","minimum":0,"maximum":60,"default":5},"years":{"description":"Term (yr)","type":"number","minimum":0.5,"maximum":50,"default":30}},"required":[],"additionalProperties":false},"methodology":["Amortized payment formula: M = P·i / (1 − (1+i)^(−m)), monthly rate i = annual/12, m payments.","The extra-payment scenario re-solves the payoff time n = −ln(1 − P·i/M′)/ln(1+i) at M′ = 1.1·M, then compares total interest.","Rates are treated as nominal annual rates compounded monthly, the standard quote for most consumer loans. Fees and rate changes are out of scope — compare offers on APR."],"usage":"POST https://xearno.tools/api/v1/tools/loan-payment with a JSON body matching inputSchema."}