How to Integrate STIBOR 3-Month Data into Your App: Complete API Guide

Introduction

In the world of finance, access to accurate and timely interest rate data is crucial for developers, economists, and financial analysts. The STIBOR (Stockholm Interbank Offered Rate) 3-Month rate is a key benchmark for interest rates in Sweden, influencing various financial products and investment decisions. Integrating STIBOR 3-Month data into your application can enhance its functionality, providing users with valuable insights into market trends and financial conditions. This guide will walk you through the process of integrating STIBOR 3-Month data using the Interest Rates API from interestratesapi.com, covering all necessary endpoints, code examples, and best practices.

Understanding the Interest Rates API

The Interest Rates API provides a comprehensive set of endpoints to access various interest rate data, including central bank rates, interbank rates, and historical financial time series. The API is designed to be developer-friendly, allowing seamless integration into fintech applications. Below are the key endpoints that will be covered in this guide:

/symbols: Retrieve a catalogue of available rate symbols.
/latest: Get the latest value per symbol.
/historical: Fetch the value on a specific date.
/timeseries: Access a series of rates between two dates.
/fluctuation: Analyze change statistics over a range.
/ohlc: Obtain OHLC candlestick data.
/convert: Compare loan interest costs between two rates.

Step 1: Retrieve Available Symbols

The first step in integrating STIBOR 3-Month data is to retrieve the available symbols from the Interest Rates API. This will help you confirm that STIBOR_3M is available for use.

Endpoint: /api/v1/symbols

This endpoint provides a catalogue of available rate symbols, allowing you to filter by category, base currency, and provider.

cURL Example:

curl "https://interestratesapi.com/api/v1/symbols?category=interbank&base=SEK&api_key=YOUR_KEY"

JSON Response Example:

{
"success": true,
"count": 1,
"symbols": [
{
"symbol": "STIBOR_3M",
"name": "STIBOR 3-Month Rate",
"category": "interbank",
"country_code": "SE",
"currency_code": "SEK",
"frequency": "monthly",
"description": "The interest rate at which banks lend to each other for a period of three months."
}
]
}

This response confirms that the STIBOR_3M symbol is available for integration.

Step 2: Fetch the Latest STIBOR 3-Month Rate

Once you have confirmed the availability of the STIBOR_3M symbol, the next step is to fetch the latest rate. This is essential for providing users with up-to-date financial information.

Endpoint: /api/v1/latest

This endpoint retrieves the latest value for specified symbols.

cURL Example:

curl "https://interestratesapi.com/api/v1/latest?symbols=STIBOR_3M&api_key=YOUR_KEY"

JSON Response Example:

{
"success": true,
"date": "2026-06-28",
"base": "SEK",
"rates": {
"STIBOR_3M": 5.33
},
"currencies": {
"STIBOR_3M": "SEK"
}
}

The response indicates that the latest STIBOR 3-Month rate is 5.33% as of June 28, 2026. This data can be displayed in your application to inform users of current borrowing costs.

Step 3: Access Historical Data

For applications that require historical analysis, fetching historical data for the STIBOR 3-Month rate is crucial. This allows users to analyze trends over time.

Endpoint: /api/v1/historical

This endpoint retrieves the value of a specified symbol on a specific date.

cURL Example:

curl "https://interestratesapi.com/api/v1/historical?date=2025-06-15&symbols=STIBOR_3M&api_key=YOUR_KEY"

JSON Response Example:

{
"success": true,
"date": "2025-06-15",
"base": "SEK",
"rates": {
"STIBOR_3M": 5.25
},
"currencies": {
"STIBOR_3M": "SEK"
}
}

This response shows that on June 15, 2025, the STIBOR 3-Month rate was 5.25%. Historical data can be used for trend analysis and forecasting.

Step 4: Analyze Time Series Data

To provide users with insights into how the STIBOR 3-Month rate has changed over a period, you can access time series data.

Endpoint: /api/v1/timeseries

This endpoint retrieves a series of rates between two specified dates.

cURL Example:

curl "https://interestratesapi.com/api/v1/timeseries?start=2025-06-01&end=2025-06-30&symbols=STIBOR_3M&api_key=YOUR_KEY"

JSON Response Example:

{
"success": true,
"base": "SEK",
"start_date": "2025-06-01",
"end_date": "2025-06-30",
"rates": {
"STIBOR_3M": {
"2025-06-01": 5.20,
"2025-06-15": 5.25,
"2025-06-30": 5.30
}
},
"frequencies": {
"STIBOR_3M": "daily"
},
"currencies": {
"STIBOR_3M": "SEK"
}
}

This response provides daily rates for the STIBOR 3-Month rate throughout June 2025, allowing users to visualize trends and fluctuations.

Step 5: Analyze Rate Fluctuations

Understanding how rates fluctuate over time can provide valuable insights for financial decision-making. The fluctuation endpoint allows you to analyze changes over a specified range.

Endpoint: /api/v1/fluctuation

This endpoint provides change statistics over a specified date range.

cURL Example:

curl "https://interestratesapi.com/api/v1/fluctuation?start=2025-06-01&end=2025-06-30&symbols=STIBOR_3M&api_key=YOUR_KEY"

JSON Response Example:

{
"success": true,
"rates": {
"STIBOR_3M": {
"start_date": "2025-06-01",
"end_date": "2025-06-30",
"start_value": 5.20,
"end_value": 5.30,
"change": 0.10,
"change_pct": 1.92,
"high": 5.30,
"low": 5.20
}
}
}

This response indicates that the STIBOR 3-Month rate increased by 0.10% over the specified period, providing insights into market trends.

Step 6: Obtain OHLC Data

For applications that require candlestick data for financial analysis, the OHLC (Open, High, Low, Close) endpoint is essential.

Endpoint: /api/v1/ohlc

This endpoint retrieves OHLC data for specified symbols over a defined period.

cURL Example:

curl "https://interestratesapi.com/api/v1/ohlc?symbols=STIBOR_3M&period=monthly&start=2025-06-01&end=2025-06-30&api_key=YOUR_KEY"

JSON Response Example:

{
"success": true,
"period": "monthly",
"start_date": "2025-06-01",
"end_date": "2025-06-30",
"rates": {
"STIBOR_3M": [
{
"period": "2025-06",
"open": 5.20,
"high": 5.30,
"low": 5.20,
"close": 5.30,
"data_points": 30
}
]
}
}

This response provides the OHLC data for the STIBOR 3-Month rate for June 2025, which can be used for technical analysis in trading applications.

Step 7: Compare Loan Interest Costs

Finally, to help users make informed financial decisions, you can compare the loan interest costs between different rates using the conversion endpoint.

Endpoint: /api/v1/convert

This endpoint compares the total interest cost of a simple loan at the latest rate of each symbol.

cURL Example:

curl "https://interestratesapi.com/api/v1/convert?from=STIBOR_3M&to=ECB_MRO&amount=100000&term_months=12&api_key=YOUR_KEY"

JSON Response Example:

{
"success": true,
"amount": 100000,
"term_months": 12,
"from": {
"symbol": "STIBOR_3M",
"rate": 5.33,
"date": "2026-06-28",
"total_interest": 5330.00,
"total_payment": 105330.00
},
"to": {
"symbol": "ECB_MRO",
"rate": 4.50,
"date": "2026-06-28",
"total_interest": 4500.00,
"total_payment": 104500.00
},
"difference": {
"rate_spread": 0.83,
"interest_saved": 830.00
}
}

This response shows the total interest costs for a loan of 100,000 SEK at both the STIBOR 3-Month and ECB MRO rates, helping users understand potential savings.

Error Handling and Rate Limits

When integrating with the Interest Rates API, it's essential to handle errors gracefully. Common error responses include:

401: Missing or invalid API key.
403: Account without an active plan.
404: No symbols matched or no data for the requested date/range.
422: Validation error (e.g., wrong date format, invalid symbol).
429: Request quota exhausted.

Additionally, the API provides rate limit headers:

X-RateLimit-Limit: The maximum number of requests allowed in a given time period.
X-RateLimit-Remaining: The number of requests remaining in the current time period.
X-RateLimit-Reset: The time when the rate limit will reset.

Conclusion

Integrating STIBOR 3-Month data into your application using the Interest Rates API from interestratesapi.com is a straightforward process that can significantly enhance your application's financial capabilities. By following the steps outlined in this guide, you can provide users with real-time interest rate data, historical trends, and valuable financial insights. For more information and to explore additional features, visit Explore Interest Rates API features and Get started with Interest Rates API.

How to Integrate STIBOR 3-Month Data into Your App: Complete API Guide

Introduction

Understanding the Interest Rates API

Step 1: Retrieve Available Symbols

Endpoint: /api/v1/symbols

cURL Example:

JSON Response Example:

Step 2: Fetch the Latest STIBOR 3-Month Rate

Endpoint: /api/v1/latest

cURL Example:

JSON Response Example:

Step 3: Access Historical Data

Endpoint: /api/v1/historical

cURL Example:

JSON Response Example:

Step 4: Analyze Time Series Data

Endpoint: /api/v1/timeseries

cURL Example:

JSON Response Example:

Step 5: Analyze Rate Fluctuations

Endpoint: /api/v1/fluctuation

cURL Example:

JSON Response Example:

Step 6: Obtain OHLC Data

Endpoint: /api/v1/ohlc

cURL Example:

JSON Response Example:

Step 7: Compare Loan Interest Costs

Endpoint: /api/v1/convert

cURL Example:

JSON Response Example:

Error Handling and Rate Limits

Conclusion

Ready to get started?

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