Loan Calculator API

Overview

To use Loan Calculator, you need an API key. You can get one by creating a free account and visiting your dashboard.

POST Endpoint

https://api.apiverve.com/v1/loanpaymentcalculator

Example

How to call the Loan Calculator API in different programming languages.

curl -X POST \
  "https://api.apiverve.com/v1/loanpaymentcalculator" \
  -H "X-API-Key: your_api_key_here" \
  -H "Content-Type: application/json" \
  -d '{
  "loanAmount": 32000,
  "interestRate": 8.5,
  "loanTerm": 6
}'

const response = await fetch('https://api.apiverve.com/v1/loanpaymentcalculator', {
  method: 'POST',
  headers: {
    'X-API-Key': 'your_api_key_here',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    "loanAmount": 32000,
    "interestRate": 8.5,
    "loanTerm": 6
})
});

const data = await response.json();
console.log(data);

import requests

headers = {
    'X-API-Key': 'your_api_key_here',
    'Content-Type': 'application/json'
}

payload = {
    "loanAmount": 32000,
    "interestRate": 8.5,
    "loanTerm": 6
}

response = requests.post('https://api.apiverve.com/v1/loanpaymentcalculator', headers=headers, json=payload)

data = response.json()
print(data)

package main

import (
    "fmt"
    "io"
    "net/http"
    "bytes"
    "encoding/json"
)

func main() {
    payload := map[string]interface{}{
        "loanAmount": "32000",
        "interestRate": "8.5",
        "loanTerm": "6"
    }

    jsonPayload, _ := json.Marshal(payload)
    req, _ := http.NewRequest("POST", "https://api.apiverve.com/v1/loanpaymentcalculator", bytes.NewBuffer(jsonPayload))

    req.Header.Set("X-API-Key", "your_api_key_here")
    req.Header.Set("Content-Type", "application/json")

    client := &http.Client{}
    resp, err := client.Do(req)
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()

    body, _ := io.ReadAll(resp.Body)
    fmt.Println(string(body))
}

{
  "status": "ok",
  "error": null,
  "data": {
    "loanAmount": 32000,
    "downpayment": 0,
    "interestRate": 8.5,
    "loanTerm": 6,
    "monthly_payment": 568.91,
    "total_interest_paid": 8961.4,
    "total_payment": 40961.52,
    "interestRatio": 21.88,
    "formatted": {
      "loanAmount": "$32,000.00",
      "monthlyPayment": "$568.91",
      "totalInterestPaid": "$8,961.40",
      "totalPayment": "$40,961.52"
    },
    "amortization_schedule": [
      {
        "month": 1,
        "interest_payment": 226.67,
        "principal_payment": 342.24,
        "remaining_balance": 31657.76
      },
      {
        "month": 2,
        "interest_payment": 224.24,
        "principal_payment": 344.67,
        "remaining_balance": 31313.09
      },
      {
        "month": 3,
        "interest_payment": 221.8,
        "principal_payment": 347.11,
        "remaining_balance": 30965.99
      }
    ]
  }
}

Authentication

The Loan Calculator API requires authentication via API key. Include your API key in the request header:

X-API-Key: your_api_key_here

Learn more about authentication →

Interactive API Playground

Test the Loan Calculator API directly in your browser with live requests and responses.

Parameters

The following parameters are available for the Loan Calculator API:

Response

The Loan Calculator API returns responses in JSON, XML, YAML, and CSV formats. The JSON response is shown in the Example section above; alternative formats below.

Other Response Formats

<?xml version="1.0" encoding="UTF-8"?>
<response>
  <status>ok</status>
  <error xsi:nil="true" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/>
  <data>
    <loanAmount>32000</loanAmount>
    <downpayment>0</downpayment>
    <interestRate>8.5</interestRate>
    <loanTerm>6</loanTerm>
    <monthly_payment>568.91</monthly_payment>
    <total_interest_paid>8961.4</total_interest_paid>
    <total_payment>40961.52</total_payment>
    <interestRatio>21.88</interestRatio>
    <formatted>
      <loanAmount>$32,000.00</loanAmount>
      <monthlyPayment>$568.91</monthlyPayment>
      <totalInterestPaid>$8,961.40</totalInterestPaid>
      <totalPayment>$40,961.52</totalPayment>
    </formatted>
    <amortization_schedule>
      <item>
        <month>1</month>
        <interest_payment>226.67</interest_payment>
        <principal_payment>342.24</principal_payment>
        <remaining_balance>31657.76</remaining_balance>
      </item>
      <item>
        <month>2</month>
        <interest_payment>224.24</interest_payment>
        <principal_payment>344.67</principal_payment>
        <remaining_balance>31313.09</remaining_balance>
      </item>
      <item>
        <month>3</month>
        <interest_payment>221.8</interest_payment>
        <principal_payment>347.11</principal_payment>
        <remaining_balance>30965.99</remaining_balance>
      </item>
    </amortization_schedule>
  </data>
</response>

status: ok
error: null
data:
  loanAmount: 32000
  downpayment: 0
  interestRate: 8.5
  loanTerm: 6
  monthly_payment: 568.91
  total_interest_paid: 8961.4
  total_payment: 40961.52
  interestRatio: 21.88
  formatted:
    loanAmount: $32,000.00
    monthlyPayment: $568.91
    totalInterestPaid: $8,961.40
    totalPayment: $40,961.52
  amortization_schedule:
    - month: 1
      interest_payment: 226.67
      principal_payment: 342.24
      remaining_balance: 31657.76
    - month: 2
      interest_payment: 224.24
      principal_payment: 344.67
      remaining_balance: 31313.09
    - month: 3
      interest_payment: 221.8
      principal_payment: 347.11
      remaining_balance: 30965.99

Response Structure

All API responses follow a consistent structure with the following fields:

Learn more about response formats →

Response Data Fields

When the request is successful, the data object contains the following fields:

Headers

Only X-API-Key is required. Optional headers include Accept for response format negotiation (JSON, XML, or YAML), User-Agent, and X-Request-ID for request tracing. See all request headers →

GraphQL AccessALPHA

Access Loan Calculator through GraphQL to combine it with other API calls in a single request. Query only the loan calculator data you need with precise field selection, and orchestrate complex data fetching workflows.

Credit Cost: Each API called in your GraphQL query consumes its standard credit cost.

POST https://api.apiverve.com/v1/graphql

query {
  loanpaymentcalculator(
    input: {
      loanAmount: 32000
      interestRate: 8.5
      loanTerm: 6
    }
  ) {
    loanAmount
    downpayment
    interestRate
    loanTerm
    monthly_payment
    total_interest_paid
    total_payment
    interestRatio
    formatted {
      loanAmount
      monthlyPayment
      totalInterestPaid
      totalPayment
    }
    amortization_schedule
  }
}

Note: Authentication is handled via the x-api-key header in your GraphQL request, not as a query parameter.

CORS Support

The Loan Calculator API accepts cross-origin requests from any origin, so it can be called directly from browser-based applications without a proxy. See CORS support →

Rate Limiting

Loan Calculator requests are throttled per minute on the Free plan and unthrottled on paid plans. Exceeding the limit returns 429 Too Many Requests; rate-limit usage is reported in the X-RateLimit-Limit, X-RateLimit-Remaining, and X-RateLimit-Reset response headers. See per-plan limits and best practices →

Error Codes

The Loan Calculator API uses standard HTTP status codes — 200 on success, 400 for invalid parameters, 401 for missing or invalid keys, 403 for insufficient credits, 429 for rate-limit exhaustion, and 500/503 for server-side issues. Each error response includes an X-Request-ID header you can quote when contacting support. See full error handling guide →

SDKs for Loan Calculator

Official Loan Calculator packages on npm, PyPI, NuGet, and JitPack — plus a Postman collection and an OpenAPI spec. See the SDK guide →

JitPack

No-Code Integrations

Loan Calculator works with Zapier, Make, Pipedream, n8n, and Power Automate using the same API key. See setup guides →

Zapier

Make

Pipedream

n8n

Power Automate

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