{"uid":"cap_fxvvMLX0rTUx8C7s8xXtw","slug":"sindri-mortgage-comparison-calculator-15-year-vs-30-year-0a089bfb","name":"Sindri Mortgage Comparison Calculator (15-Year vs 30-Year)","description":"15-year vs 30-year mortgage comparison calculator. Computes monthly payment and total interest for both loan terms on the same purchase price and down payment, and reports the payment and lifetime-interest tradeoff between them.","url":"https://x402.outpimp.com/mortgageComparisonCalculator","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"purchasePrice":{"type":"number","description":"Home purchase price."},"interestRate15":{"type":"number","description":"Annual interest rate for the 15-year loan, as a fraction."},"interestRate30":{"type":"number","description":"Annual interest rate for the 30-year loan, as a fraction."},"downPaymentPercent":{"type":"number","default":0.2,"description":"Down payment as a fraction of purchase price (0-1). Default 0.2."}}},"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_0vu21v52G1MkeME_yBToa","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":"Computes and compares monthly payments and total lifetime interest for 15-year and 30-year fixed mortgages on the same property, reporting the tradeoff between the two loan terms.","exampleAgentPrompt":"Can you compare the monthly payments and total interest for a 15-year mortgage at 6.2% versus a 30-year at 6.9% on a $450,000 home with 20% down?","exampleUseCases":[{"title":"First-time homebuyer loan term decision","prompt":"I'm buying a $380,000 house and putting 10% down — can you show me the monthly payment and total interest for both a 15-year at 5.9% and a 30-year at 6.5% so I can decide which term makes sense for me?"},{"title":"Refinance tradeoff analysis","prompt":"I'm refinancing my home at $600,000 with 25% equity already paid off — compare a 15-year refi at 5.75% versus a 30-year at 6.4% and tell me how much interest I'd save over the life of the loan."},{"title":"Real estate investment mortgage sizing","prompt":"For a rental property priced at $275,000 with 20% down, what would the monthly payment and total interest look like on a 15-year at 7.1% versus a 30-year at 7.6%? I want to see the full cost difference."}],"resultDescription":"Returns computed monthly payment amounts and total interest paid over the full loan term for both the 15-year and 30-year scenarios, along with the difference in monthly payment and total lifetime interest savings when choosing the shorter term.","failureModes":["Missing required fields (purchasePrice, interestRate15, or interestRate30) returns a validation error","Interest rates provided as percentages (e.g. 6.5) instead of fractions (e.g. 0.065) may produce wildly incorrect results","Negative or zero purchase price or interest rate yields nonsensical output","downPaymentPercent outside 0–1 range may cause errors or incorrect loan principal calculation","Payment failure or network timeout returns a 402 or connection error"],"whenToPreferThis":"Use this endpoint when you need a side-by-side numerical comparison of 15-year and 30-year mortgage terms on the same property — especially when you want both monthly payment and total lifetime interest figures simultaneously. It is purpose-built for this single comparison rather than being a general amortization engine, making it ideal for quick decisioning in home-buying or refinancing workflows. Prefer it over general-purpose financial calculators when the specific 15 vs 30-year tradeoff is the question at hand.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T18:49:48.464Z","isFirstParty":false}