{"slug":"agent402-tools-api-loan-payment-8d0084","title":"Compute the monthly (or per-period) payment on a fully-amortizing loan","host":"agent402.tools","method":"POST","resource":"https://agent402.tools/api/loan-payment","category":"other","description":"Compute the monthly (or per-period) payment on a fully-amortizing loan: mortgage, auto, student loan, business loan. Returns the periodic payment, total paid over the term, and total interest. Matches Excel's PMT(rate, nper, -principal). Use this when you just need the payment number, not the full p","price_listed":0.001,"price_asked":0.001,"state":"answering","state_label":"Answering","checks_7d":1,"answered_7d":1,"latency_ms_median":1553,"reported_calls_30d":5,"reported_payers_30d":1,"networks":["algorand:wGHE2Pwdvd7S12BL5FaOP20EGYesN73ktiC1qzkkit8=","eip155:10","eip155:1329","eip155:137","eip155:143","eip155:42161","eip155:42220","eip155:43114","eip155:4663","eip155:8453","solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","stellar:pubnet"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"body":{"annualRate":0.06,"principal":200000,"termYears":30},"bodyType":"json","method":"POST","type":"http"},"output_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"additionalProperties":false,"properties":{"body":{"properties":{"annualRate":{"description":"Annual interest rate as decimal (0.06 = 6%)","type":"number"},"paymentsPerYear":{"description":"Payments per year (12 = monthly, 26 = bi-weekly, 52 = weekly). Default 12.","type":"number"},"principal":{"description":"Loan principal (positive)","type":"number"},"termYears":{"description":"Loan term in years","type":"number"}},"required":["principal","annualRate","termYears"]},"bodyType":{"enum":["json","form-data","text"],"type":"string"},"method":{"enum":["POST"],"type":"string"},"type":{"const":"http","type":"string"}},"required":["type","method","bodyType","body"],"type":"object"},"output":{"properties":{"example":{"properties":{"payment":{"type":"number"},"periodicRate":{"type":"number"},"periods":{"type":"integer"},"totalInterest":{"type":"number"},"totalPaid":{"type":"number"}},"required":["payment","totalPaid","totalInterest","periods","periodicRate"],"type":"object"},"type":{"type":"string"}},"required":["type"],"type":"object"}},"required":["input"],"type":"object"},"history":[{"day":"2026-09-24","reachable":true,"status":402,"valid_402":true,"asked_usdc":0.001,"price_match":true,"latency_ms":1553,"error":null}],"description_full":"Compute the monthly (or per-period) payment on a fully-amortizing loan: mortgage, auto, student loan, business loan. Returns the periodic payment, total paid over the term, and total interest. Matches Excel's PMT(rate, nper, -principal). Use this when you just need the payment number, not the full per-period schedule (see amortization).","last_updated":"2026-09-21T11:07:08.11Z","schemes":["exact","upto"]}