Top Financial Services APIs in 2025

Exploring the Top 10 Financial APIs for Developers

In the rapidly evolving world of finance, APIs (Application Programming Interfaces) play a crucial role in enabling developers to access and integrate various financial data and services into their applications. This blog post will delve into the top 10 financial APIs that developers can leverage to enhance their applications, streamline processes, and provide valuable insights to users. Each API will be discussed in detail, highlighting its features, capabilities, and practical applications.

1. SEC Filings API

The SEC Filings API provides access to regulatory documents that companies must submit to the Securities and Exchange Commission (SEC). This API is essential for developers looking to retrieve SEC filings based on stock codes or Central Index Key (CIK).

With this API, users can obtain a comprehensive list of SEC filings for a specified company using just the ticker symbol. The API returns key details such as filing name, accession number, filing date, and form type. This information is invaluable for investors and analysts who need to evaluate the transparency and financial health of companies.

Key Features:

• Get SEC Filing: This feature returns a list of SEC filings for the requested company. The response includes fields like name, accessionNumber, filingDate, period, and formType. Developers can use this data to display recent filings and help users make informed investment decisions.

{
    "meta": {
        "copyright": "Copyright 2022 Last10K.com All Rights Reserved",
        "terms": ["https://dev.last10k.com/terms", "https://www.sec.gov/privacy.htm#security"]
    },
    "data": {
        "attributes": {
            "status": 0,
            "company": {
                "name": "AMAZON COM INC",
                "cik": "1018724",
                "ticker": "amzn"
            },
            "count": 346,
            "result": [
                {
                    "name": "Quarterly Report",
                    "accessionNumber": "0001018724-22-000019",
                    "filingDate": "2022-07-29T00:00:00",
                    "period": "2022-06-30T00:00:00",
                    "formType": "10-Q",
                    "url": "https://www.sec.gov/Archives/edgar/data/1018724/000101872422000019/amzn-20220630.htm"
                }
            ]
        }
    }
}
    

• Get Balance Sheet: This feature returns a company's most recent balance sheet, summarizing their liabilities, assets, and shareholders' equity. The response includes fields like CashAndCashEquivalentsAtCarryingValue, Assets, and Liabilities. Developers can utilize this data to provide users with insights into a company's financial position.

{
    "meta": {
        "copyright": "Copyright 2022 Last10K.com All Rights Reserved",
        "terms": ["https://dev.last10k.com/terms", "https://www.sec.gov/privacy.htm#security"]
    },
    "data": {
        "attributes": {
            "status": 0,
            "company": {
                "name": "Meta Platforms, Inc.",
                "cik": "1326801",
                "ticker": "fb"
            },
            "filing": {
                "name": "Consolidated Balance Sheets",
                "accessionNumber": "0001326801-22-000018",
                "filingDate": "2022-02-03T00:00:00",
                "period": "2021-12-31T00:00:00",
                "formType": "10-K",
                "filingCount": 10
            },
            "result": {
                "CashAndCashEquivalentsAtCarryingValue": 16601000000.0,
                "Assets": 165987000000.0,
                "Liabilities": 41108000000.0,
                "StockholdersEquity": 124879000000.0
            }
        }
    }
}
    

2. Financial Sentiment Analysis API

The Financial Sentiment Analysis API utilizes language processing techniques to analyze the sentiment of financial-related text. This API is particularly useful for financial websites that want to categorize content based on sentiment.

By sending a text string to this API, developers can receive a sentiment score categorized as Positive, Neutral, or Negative, along with a numerical score and keywords associated with the sentiment. This functionality can enhance user engagement by tailoring content based on sentiment analysis.

Key Features:

• Sentiment Analysis: To use this feature, users must input a text string. The response includes fields such as type (sentiment category), score (numerical sentiment score), ratio (sentiment ratio), and keywords (list of significant words with their scores). Developers can use this data to categorize financial content and identify trends in sentiment over time.

{
    "type": "positive",
    "score": 0.917220858,
    "ratio": 1,
    "keywords": [
        {
            "word": "love",
            "score": 0.917220858
        }
    ],
    "version": "7.5.7",
    "author": "twinword inc.",
    "email": "[email protected]",
    "result_code": "200",
    "result_msg": "Success"
}
    

3. Interests Calculator API

The Interests Calculator API allows developers to incorporate compound interest calculations into their applications effortlessly. This API simplifies the complex mathematics involved in calculating compound interest, making it accessible for financial planning applications.

By entering parameters such as the principal amount, interest rate, and time period, developers can receive a JSON response containing the calculated compound interest amount. This API is particularly useful for retirement planning tools, investment analysis, and budgeting applications.

Key Features:

• Get Interests: To use this feature, users must enter the initial investment, annual contribution, duration, and interest rate. The response includes fields like apy (annual percentage yield), compound_interest, investment_returns, and principal. Developers can use this data to help users forecast their savings and investment goals over time.

{
    "apy": "5.61%",
    "compound_interest": "€258.49",
    "investment_returns": "€4862.55",
    "principal": "$5000",
    "rate": "5.50%",
    "time_months": "12 M",
    "time_years": "1.00 Y"
}
    

4. Foreign Exchange API

The Foreign Exchange API provides developers with access to real-time foreign exchange data and services. This API is essential for applications that require accurate currency conversion and exchange rate information.

With this API, developers can retrieve real-time exchange rates for various currency pairs, perform currency conversions, and access historical exchange rate data. This functionality is crucial for e-commerce platforms, financial reporting tools, and international money transfer applications.

Key Features:

• Get Conversion: To use this feature, users must specify the currencies they want to convert and the amount. The response includes fields such as success (indicating the request status), result (containing conversion details), and date (the conversion date). Developers can use this data to facilitate multi-currency transactions in their applications.

{
    "success": true,
    "result": {
        "date": "2023-05-04T19:48:02.114Z",
        "from": {
            "currency": "EUR",
            "amount": 20
        },
        "to": {
            "currency": "USD",
            "amount": 22.148
        }
    }
}
    

5. The Current Interest Rates API

The Current Interest Rates API enables developers and financial professionals to access real-time interest rate information from central banks and benchmarks worldwide. This API is invaluable for making informed financial decisions and performing market analysis.

With this API, users can retrieve current interest rates set by central banks, along with additional details such as the date and time of the rate update. This information is essential for financial institutions, traders, and investors who rely on accurate interest rate data.

Key Features:

• Get Interest Rate: To use this feature, users simply run the endpoint to obtain interest rate information. The response includes fields such as central_bank (name of the bank), country (associated country), rate_pct (current interest rate), and last_updated (timestamp of the last update). Developers can use this data to track changes in interest rates over time.

{
    "central_bank_rates": [
        {
            "central_bank": "Australian Central Bank",
            "country": "Australia",
            "rate_pct": 4.35,
            "last_updated": "11-08-2023"
        }
    ]
}
    

6. Forex API

The Forex API provides real-time exchange rates for over 190 currencies. This API is designed for applications that require accurate currency conversions and exchange rate information.

With this API, developers can access the latest exchange rates, perform currency conversions, and retrieve historical data. This functionality is essential for e-commerce platforms, financial applications, and international payment gateways.

Key Features:

• Get Latest Rates: To use this feature, users simply run the endpoint to receive USD-based rates updated every 10 minutes. The response includes fields such as bs (base currency), ts (timestamp), and rt (exchange rates). Developers can use this data to display current exchange rates in their applications.

{
    "bs": "USD",
    "ts": 1692112793,
    "rt": {
        "EUR": 0.9146957767426027,
        "JPY": 145.33945833333334,
        "GBP": 0.7844559933265874
    }
}
    

7. Banks Interest Rate API

The Banks Interest Rate API provides access to global central bank interest rates and key financial benchmarks. This API is essential for users looking to make informed decisions in the financial landscape.

With this API, developers can retrieve up-to-date interest rate information from various central banks, allowing for comprehensive analysis and comparison across different countries.

Key Features:

• Get Interest: To use this feature, users run the endpoint to receive information about central bank interest rates and benchmarks. The response includes fields such as central_bank, country, rate_pct, and last_updated. Developers can use this data to monitor interest rate changes and make informed financial decisions.

{
    "central_bank_rates": [
        {
            "central_bank": "British Central Bank",
            "country": "United Kingdom",
            "rate_pct": 5.25,
            "last_updated": "08-03-2023"
        }
    ]
}
    

8. Mortgage Calculator API

The Mortgage Calculator API simplifies the complexities of home financing by providing detailed mortgage insights. This API is designed to help users understand their financial commitments when purchasing a home.

By passing parameters such as loan amount, home value, and interest rate, developers can receive detailed calculations of monthly and annual payments, total interest paid, and itemized costs. This API is particularly useful for homebuyers, financial advisors, and real estate professionals.

Key Features:

• Calculate: This feature allows users to receive calculated interests over their mortgage. The response includes fields such as monthly_payment, annual_payment, and total_interest_paid. Developers can use this data to help users assess their financial commitments and make informed decisions regarding home purchases.

{
    "monthly_payment": {
        "total": 1001,
        "mortgage": 1001,
        "property_tax": 0,
        "hoa": 0.0,
        "annual_home_ins": 0
    },
    "annual_payment": {
        "total": 12015,
        "mortgage": 12015,
        "property_tax": 0.0,
        "hoa": 0.0,
        "home_insurance": 0.0
    },
    "total_interest_paid": 100374
}
    

9. Instant Forex Rates API

The Instant Forex Rates API provides exchange rate data that is crucial for smooth financial transactions and accurate currency conversions. This API is designed for applications that require real-time foreign exchange rates.

With this API, developers can access a comprehensive repository of foreign exchange rates, enabling them to integrate dynamic and reliable currency information into their applications.

Key Features:

• Available Currencies: To use this feature, users run the endpoint to get a list of all available currencies. The response includes fields such as symbol and name. Developers can use this data to inform users about the currencies supported by the API.

[
    {"symbol": "USD", "name": "United States Dollar"},
    {"symbol": "EUR", "name": "Euro Member Countries"},
    {"symbol": "JPY", "name": "Japan Yen"}
]
    

• Conversion Currencies: To use this feature, users must indicate two currencies and an amount in the parameters. The response includes fields such as success, from, to, and convertedAmount. Developers can use this data to facilitate currency conversions in their applications.

{
    "success": true,
    "result": {
        "from": "USD",
        "to": "EUR",
        "amountToConvert": 10,
        "convertedAmount": 9.068150000000001
    }
}
    

10. Global Interest Rates API

The Global Interest Rates API provides access to interest rates from central banks and financial benchmarks worldwide. This API is essential for users looking to navigate the financial landscape and make informed decisions.

With this API, developers can retrieve up-to-date interest rate information from various central banks, allowing for comprehensive analysis and comparison across different countries.

Key Features:

• Interest Rate: To use this feature, users must indicate the name of a country to obtain its central banks or the name of non-central banks in the parameter. The response includes fields such as central_bank, country, rate_pct, and last_updated. Developers can use this data to monitor interest rate changes and make informed financial decisions.

{
    "central_bank_rates": [
        {
            "central_bank": "New Zealand Central Bank",
            "country": "New Zealand",
            "rate_pct": 5.5,
            "last_updated": "05-24-2023"
        }
    ]
}
    

Conclusion

In conclusion, the financial APIs discussed in this blog post provide developers with powerful tools to access and integrate essential financial data into their applications. From retrieving SEC filings and analyzing financial sentiment to calculating mortgage payments and accessing real-time exchange rates, these APIs offer a wide range of functionalities that can enhance user experiences and streamline financial processes. By leveraging these APIs, developers can create innovative solutions that empower users to make informed financial decisions and navigate the complexities of the financial landscape with ease.