Add a mortgage/loan calculator to your app via API

When building an app, one of the most common pain points developers face is incorporating financial calculators, such as a mortgage calculator or loan calculator. These tools can be complex and time-consuming to implement from scratch, requiring knowledge of financial formulas and potentially heavy computations.

This problem is further complicated by the need for accurate and up-to-date data on interest rates, compound interest, and other financial factors that can vary significantly between countries and regions.

The Finance, Holidays & OG Image Tools API offers a lightweight solution to this problem. This API provides a wide range of features in one place, including public holidays by country, loan calculators, and dynamic Open Graph social-image generation. By using the Finance API, developers can easily add these financial calculators to their app without having to build them from scratch.

One of the key benefits of the Finance API is its flexibility. It allows developers to easily switch between different types of loans or financial instruments, making it a versatile solution for building a range of apps and websites.

When using the Finance API, requests are typically made in JSON format, containing the necessary parameters such as loan amount, interest rate, term length, and country. The response from the API will be in XML format, providing detailed calculations and results.

A typical request might look something like this:

• Request: GET /loan-calculator?amount=10000&interestRate=5&termLength=30&country=US
• Response: A detailed calculation of the loan amount, interest paid over time, and total cost of the loan

The response will contain information such as:

• The monthly payment
• The total interest paid over the term length
• The total cost of the loan
• The final balance after the term length has expired

This level of detail provides a comprehensive understanding of the loan or mortgage, allowing users to make informed decisions about their financial situation.

If you're looking for an easy and efficient way to add a mortgage or loan calculator to your app, we recommend checking out the Finance API. It's a powerful tool that can help simplify your development process and provide accurate results.

One of the best ways to try out the Finance API is by using RapidAPI's free tier. With RapidAPI, you can access the API without paying any costs during the trial period, giving you the opportunity to test its features and see if it's a good fit for your project.

Quick example

curl -X GET 'https://finance-holidays-and-og-image-tools.p.rapidapi.com/holidays?country=US&year=2026' \
  -H 'X-RapidAPI-Key: YOUR_RAPIDAPI_KEY' \
  -H 'X-RapidAPI-Host: finance-holidays-and-og-image-tools.p.rapidapi.com'

Try it: the Finance, Holidays & OG Image Tools API is live on RapidAPI with a free tier — get your key here.