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Sindri Mortgage Comparison Calculator (15-Year vs 30-Year)
x402
Sindri Mortgage Comparison Calculator (15-Year vs 30-Year) is a paid API for AI agents from ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-30).
Computes and compares monthly payments and total lifetime interest for both 15-year and 30-year mortgage terms given a purchase price, down payment, and respective interest rates.
Price / call$0.01
Success—
StatusUnknown
How this service works
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.
Output
Returns computed monthly payment amounts and total interest paid for both the 15-year and 30-year loan scenarios, along with the delta between them — showing how much more the 15-year costs monthly and how much interest it saves over the full loan lifetime.
Example use cases
First-time homebuyer loan term decision
“I'm buying a $380,000 house with 20% down. The bank offered me 6.0% for 15 years or 6.75% for 30 years. Can you calculate both monthly payments and tell me how much interest I'd save over the life of the loan if I go with the 15-year?”
Refinance term comparison
“I'm refinancing my home worth $520,000 and putting 25% down. I'm weighing a 15-year refi at 5.9% versus a 30-year at 6.5%. What's the difference in monthly payments and total interest paid?”
Real estate investment analysis
“For a $650,000 investment property with 30% down, compare a 15-year mortgage at 7.0% versus a 30-year at 7.5% — I want to see the monthly payment gap and the lifetime interest savings.”
Technical details
Endpoint
POSThttps://ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/mortgageComparisonCalculator?utm_source=zero.xyzWhen to prefer
Use this endpoint when a user specifically wants to compare 15-year and 30-year mortgage terms side-by-side in a single call, seeing both monthly payment and total interest tradeoffs simultaneously. Prefer it over generic mortgage calculators when the core question is about the term-length decision rather than just computing a single loan's payment.
Side effects
- Missing required fields (purchasePrice, interestRate15, or interestRate30) returns an error
- Interest rates provided as percentages (e.g. 6.5) instead of fractions (e.g. 0.065) may produce unrealistic results
- Negative or zero purchase price causes computation errors
- Down payment fraction outside 0-1 range may produce invalid results
- AWS Lambda cold start may cause slightly elevated first-call latency
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| purchasePrice | number | Home purchase price. |
| interestRate15 | number | Annual interest rate for the 15-year loan, as a fraction. |
| interestRate30 | number | Annual interest rate for the 30-year loan, as a fraction. |
| downPaymentPercent | number | Down payment as a fraction of purchase price (0-1). Default 0.2. |
Tags
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