Biweekly payment savings calculator API

Models an accelerated biweekly schedule (26 half-payments = 13 monthly payments/yr) against the standard monthly amortization and returns interest and months saved. Answers 'How much does paying biweekly save?','How much sooner do biweekly payments pay off the loan?'.

Price$0.01per request

MethodPOST

Route/v1/calc/loan-biweekly-savings

StatusLive

MIME typeapplication/json

Rate limit120/minute

CacheNo cache

loanbiweeklyamortizationmortgagesavingsinterestcalculator

API URLhttps://x402.hexl.dev/v1/calc/loan-biweekly-savings

Integration docs

Example request

{
  "principal": 200000,
  "annualRatePct": 5,
  "termMonths": 360
}

Example response

{
  "monthlyPayment": 1073.64,
  "biweeklyPayment": 536.82,
  "baseInterest": 186511.57,
  "acceleratedInterest": 151569.86,
  "interestSaved": 34941.71,
  "baseMonths": 360,
  "acceleratedMonths": 304,
  "monthsSaved": 56,
  "breakdown": {
    "principal": 200000,
    "effectiveAnnualPayments": 13,
    "equivalentMonthly": 1163.11
  }
}

Input schema

{
  "type": "object",
  "required": [
    "principal",
    "annualRatePct",
    "termMonths"
  ],
  "properties": {
    "principal": {
      "type": "number",
      "description": "Loan principal.",
      "examples": [
        200000
      ]
    },
    "annualRatePct": {
      "type": "number",
      "description": "Annual nominal rate in percent.",
      "examples": [
        5
      ]
    },
    "termMonths": {
      "type": "number",
      "description": "Term in months.",
      "examples": [
        360
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}