{"uid":"cap_fcmJleP_g_hNId3ii8n11","slug":"saylor-innovations-credit-card-payoff-calculator-9bdffcff","name":"Saylor Innovations Credit Card Payoff Calculator","description":"Credit card payoff time from balance, APR and a fixed payment - months, total interest, total paid and what share of payments goes to interest","url":"https://saylorinnovations.com/api/finance/credit-card-payoff?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":["balance","apr","monthly_payment"],"properties":{"apr":{"type":"string","description":"Annual rate in percent"},"balance":{"type":"string","description":"Current balance"},"monthly_payment":{"type":"string","description":"Fixed monthly 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months to pay off a credit card given balance, APR, and a fixed monthly payment, returning total interest, total paid, and interest share percentage","exampleAgentPrompt":"How long will it take me to pay off a $4,500 credit card balance at 22.99% APR if I pay $150 a month, and how much interest will I end up paying in total?","exampleUseCases":[{"title":"Debt-free date planning","prompt":"I have $8,200 on a credit card with a 19.99% APR and I can afford to pay $250 a month — how many months until it's paid off and what's my total interest bill?"},{"title":"Evaluating a fixed payment strategy","prompt":"If I lock in a $300 monthly payment on a $6,000 balance at 24% APR, what share of everything I pay ends up going to interest rather than principal?"},{"title":"Minimum payment wake-up call","prompt":"What's the typical minimum payment on a $3,000 credit card balance at 18.9% APR, and if I just pay that fixed amount each month, how long does it take to clear the debt and how much interest do I rack up?"}],"resultDescription":"Returns a JSON object with months_to_payoff, years_to_payoff, total_interest, total_paid, interest_share_percent, monthly_payment, balance, apr_percent, typical_minimum_payment_first_month, and an optional practical tip about holding the payment constant","failureModes":["Missing required query parameters (balance, apr, monthly_payment) returns an error","Monthly payment too low to cover accruing interest may return an error or infinite payoff projection","Non-numeric strings passed for numeric fields cause validation errors","APR of 0 or negative values may produce unexpected results"],"whenToPreferThis":"Choose this endpoint when you need a fast, lightweight amortization calculation specifically for credit card debt with a fixed monthly payment — it returns not just payoff timeline but also interest share percentage and a minimum payment estimate, making it ideal for debt counseling, budgeting agents, or financial planning workflows without requiring a full loan amortization library","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-18T12:56:38.450Z","isFirstParty":false,"canonicalSlug":"saylor-innovations-credit-card-payoff-calculator-9bdffcff"}