LendAPI Amortization API

openapi: 3.1.0
info:
  title: lendapi Amortization API
  version: '1.0'
servers:
- url: https://app.lendapi.com/api/v1/
security:
- sec0: []
tags:
- name: Amortization
paths:
  /amortization/:
    post:
      summary: Amortization
      description: This endpoint calculates and returns the amortization schedule for a loan based on the provided loan details. The amortization schedule breaks down each payment into principal and interest components over the life of the loan. APR and periodic_payment are also calculated.
      operationId: lendapi-amortization
      requestBody:
        content:
          application/json:
            schema:
              type: object
              required:
              - amount
              - interest_rate
              - term
              - term_frequency
              properties:
                amount:
                  type: number
                  description: Loan Amount, this is the loan amount with two decimal points, for example 10000.12
                  format: float
                fee:
                  type: number
                  description: Application Fee. Will use 0 if empty
                  format: float
                interest_rate:
                  type: number
                  description: Loan Interest Rate in percentage. If interest rate is 12.50%, you shall enter 12.50
                  format: float
                term:
                  type: integer
                  description: The number of term per the term_frequency below
                  format: int32
                term_frequency:
                  type: string
                  description: Can be ‘monthly', 'semi-monthly', 'bi-weekly', 'weekly', 'quarterly’
                disbursement_date:
                  type: string
                  description: Optional. Fund disbursement date, date format yyyy-MM-dd
                first_payment_date:
                  type: string
                  description: Optional. First payment date, date format yyyy-MM-dd
            examples:
              Request Example:
                value:
                  amount: 14200
                  fee: 1135
                  term: 12
                  term_frequency: monthly
                  interest_rate: 32
                  disbursement_date: '2025-12-04'
                  first_payment_date: '2026-02-24'
      responses:
        '200':
          description: '200'
          content:
            application/json:
              examples:
                Result:
                  value:
                    object: amortization
                    url: /v1/amortization/
                    result:
                      code: 1
                      total_payments: 18933.63
                      total_interests: 3598.63
                      periodic_payment: 1577.81
                      application_fee: 1135
                      financial_charge: 4733.63
                      interest_rate: 32
                      apr: 44.2135
                      amount: 14200
                      term: 12
                      term_frequency: monthly
                      disbursement_date: '2025-12-04'
                      first_payment_date: '2026-02-24'
                      amortization:
                      - period: 1
                        date: '2026-02-24'
                        periodic_payment: 1577.81
                        interest: 1114.87
                        principal: 462.94
                        balance: 14872.06
                        cumulative_interests: 1114.87
                        unit_periods: 2.6666666666666665
                      - period: 2
                        date: '2026-03-24'
                        periodic_payment: 1577.81
                        interest: 396.59
                        principal: 1181.22
                        balance: 13690.84
                        cumulative_interests: 1511.46
                        unit_periods: 3.6666666666666665
                      - period: 3
                        date: '2026-04-24'
                        periodic_payment: 1577.81
                        interest: 365.09
                        principal: 1212.72
                        balance: 12478.12
                        cumulative_interests: 1876.55
                        unit_periods: 4.666666666666667
                      - period: 4
                        date: '2026-05-24'
                        periodic_payment: 1577.81
                        interest: 332.75
                        principal: 1245.06
                        balance: 11233.06
                        cumulative_interests: 2209.3
                        unit_periods: 5.666666666666667
                      - period: 5
                        date: '2026-06-24'
                        periodic_payment: 1577.81
                        interest: 299.55
                        principal: 1278.26
                        balance: 9954.8
                        cumulative_interests: 2508.85
                        unit_periods: 6.666666666666667
                      - period: 6
                        date: '2026-07-24'
                        periodic_payment: 1577.81
                        interest: 265.46
                        principal: 1312.35
                        balance: 8642.45
                        cumulative_interests: 2774.31
                        unit_periods: 7.666666666666667
                      - period: 7
                        date: '2026-08-24'
                        periodic_payment: 1577.81
                        interest: 230.47
                        principal: 1347.34
                        balance: 7295.11
                        cumulative_interests: 3004.78
                        unit_periods: 8.666666666666666
                      - period: 8
                        date: '2026-09-24'
                        periodic_payment: 1577.81
                        interest: 194.54
                        principal: 1383.27
                        balance: 5911.84
                        cumulative_interests: 3199.32
                        unit_periods: 9.666666666666666
                      - period: 9
                        date: '2026-10-24'
                        periodic_payment: 1577.81
                        interest: 157.65
                        principal: 1420.16
                        balance: 4491.68
                        cumulative_interests: 3356.97
                        unit_periods: 10.666666666666666
                      - period: 10
                        date: '2026-11-24'
                        periodic_payment: 1577.81
                        interest: 119.78
                        principal: 1458.03
                        balance: 3033.65
                        cumulative_interests: 3476.75
                        unit_periods: 11.666666666666666
                      - period: 11
                        date: '2026-12-24'
                        periodic_payment: 1577.81
                        interest: 80.9
                        principal: 1496.91
                        balance: 1536.74
                        cumulative_interests: 3557.65
                        unit_periods: 12.666666666666666
                      - period: 12
                        date: '2027-01-24'
                        periodic_payment: 1577.72
                        interest: 40.98
                        principal: 1536.74
                        balance: 0
                        cumulative_interests: 3598.63
                        unit_periods: 13.666666666666666
              schema:
                type: object
                properties:
                  object:
                    type: string
                    example: amortization
                  url:
                    type: string
                    example: /v1/amortization/
                  result:
                    type: object
                    properties:
                      code:
                        type: integer
                        example: 1
                        default: 0
                      amortization:
                        type: array
                        items:
                          type: object
                          properties:
                            period:
                              type: integer
                              example: 1
                              default: 0
                            periodic_payment:
                              type: number
                              example: 350.12
                              default: 0
                            principal:
                              type: number
                              example: 223.87
                              default: 0
                            interest:
                              type: number
                              example: 126.25
                              default: 0
                            balance:
                              type: number
                              example: 9876.13
                              default: 0
                            cumulative_interests:
                              type: number
                              example: 126.25
                              default: 0
                      total_payments:
                        type: number
                        example: 12604.31
                        default: 0
                      total_interests:
                        type: number
                        example: 2504.31
                        default: 0
                      periodic_payment:
                        type: number
                        example: 350.12
                        default: 0
                      interest_rate:
                        type: integer
                        example: 15
                        default: 0
                      apr:
                        type: number
                        example: 15.705847098039083
                        default: 0
                      amount:
                        type: integer
                        example: 10000
                        default: 0
                      fee:
                        type: integer
                        example: 100
                        default: 0
                      term:
                        type: integer
                        example: 36
                        default: 0
                      term_frequency:
                        type: string
                        example: monthly
                      msg:
                        type: string
                        example: Success
        '400':
          description: '400'
          content:
            application/json:
              examples:
                Result:
                  value: '{}'
              schema:
                type: object
                properties: {}
      deprecated: false
      tags:
      - Amortization
components:
  securitySchemes:
    sec0:
      type: apiKey
      in: header
      name: AUTHORIZATION
      x-default: Bearer your_api_key