{"uid":"cap_jfPheFuCa7GqK6qZrRypU","slug":"saylor-innovations-mortgage-pay-fixed-rate-mortgage-calculator-aacbb9ff","name":"Saylor Innovations Mortgage Pay — Fixed-Rate Mortgage Calculator","description":"Fixed-rate mortgage calculator - monthly payment, total paid and total interest","url":"https://saylorinnovations.com/api/realestate/mortgage?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["principal","apr","months"],"properties":{"apr":{"type":"string","description":"required annual percentage rate from 0 to 100 (query)"},"months":{"type":"string","description":"required integer term from 1 to 1200 months (query)"},"principal":{"type":"string","description":"required positive loan amount (query)"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string","const":"json"},"example":{"type":"object","required":["principal","annual_rate_percent","months","monthly_payment","scope_note"],"properties":{"months":{"type":"number","description":"Number of months"},"formula":{"type":"string","description":"Formula used for the calculation"},"principal":{"type":"number","description":"Starting principal amount"},"scope_note":{"type":"string","description":"What this data covers and what it leaves out"},"total_paid":{"type":"number","description":"Total paid"},"total_interest":{"type":"number","description":"Total interest"},"monthly_payment":{"type":"number","description":"Monthly payment amount"},"annual_rate_percent":{"type":"number","description":"Annual rate as a percentage"}}}}}}},"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_IQJAvGUYcFlgeqJ3f5r1b","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":"Calculates monthly payment, total amount paid, and total interest for a fixed-rate mortgage given principal, APR, and term in months","exampleAgentPrompt":"Can you calculate my monthly mortgage payment for a $350,000 loan at 6.75% APR over 30 years (360 months) and tell me how much total interest I'd pay?","exampleUseCases":[{"title":"First-time homebuyer affordability check","prompt":"I'm looking at a $450,000 home and plan to put 20% down, so I'd be borrowing $360,000 at a 7.1% APR over 30 years — what would my monthly payment be and how much total interest would I end up paying?"},{"title":"Comparing 15-year vs 30-year mortgage","prompt":"Can you figure out the monthly payment and total interest for a $300,000 mortgage at 6.5% APR for both 180 months and 360 months so I can compare the two options?"},{"title":"Refinance savings estimate","prompt":"I'm thinking about refinancing my home. If I take a $275,000 loan at 5.9% APR for 240 months, what would my fixed monthly payment be and what's the total I'd pay back over the life of the loan?"}],"resultDescription":"Returns a JSON object containing the original principal, annual rate as a percentage, number of months, the computed fixed monthly payment amount, total amount paid over the loan term, total interest paid, the formula used for calculation, and a scope note clarifying what the calculation covers and excludes.","failureModes":["Missing required query parameters (principal, apr, or months) returns an error","Non-numeric or out-of-range values for apr (outside 0–100) or months (outside 1–1200) may return errors","Zero or negative principal returns an error","Payment gateway failure (x402) if USDC balance is insufficient for the $0.01 per-call fee","Network timeout or server unavailability"],"whenToPreferThis":"Choose this endpoint when you need a straightforward fixed-rate mortgage payment calculation — monthly payment, total paid, and total interest — given a principal, APR, and term in months. Ideal for real estate, personal finance, or lending agents that need quick, reliable arithmetic without managing their own formula implementation. Not suitable for adjustable-rate mortgages, amortization schedules, escrow estimates, or calculations involving PMI, taxes, or insurance.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T07:22:04.754Z","isFirstParty":false,"canonicalSlug":"saylor-innovations-mortgage-pay-fixed-rate-mortgage-calculator-aacbb9ff"}