How to Retrieve Kospi 200 Index OHLC Data for Quantitative Research Projects with Indices-API

Introduction

In the world of quantitative research and advanced trading analysis, having access to accurate and timely financial data is crucial. One of the most significant indices for investors and analysts in the Asian markets is the Kospi 200 Index (KS200). This index represents the top 200 companies listed on the Korea Exchange and serves as a benchmark for the South Korean economy. In this blog post, we will explore how to retrieve Kospi 200 Index OHLC (Open, High, Low, Close) data using the Indices-API. We will delve into the API's capabilities, provide sample requests, and discuss integration tips to enhance your quantitative research projects.

About Kospi 200 Index (KS200)

The Kospi 200 Index is a vital indicator of the South Korean stock market's performance. It includes a diverse range of sectors, providing a comprehensive view of the market's health. For researchers and traders, understanding the OHLC data of this index is essential for making informed decisions. The OHLC data allows analysts to assess market trends, volatility, and potential entry or exit points for trades. By leveraging the Indices-API, developers can access this data in real-time, enabling them to build sophisticated trading algorithms and analytical tools.

API Description

The Indices-API is a powerful tool designed for developers looking to integrate financial data into their applications. This API provides real-time and historical data for various indices, including the Kospi 200. With its innovative architecture, the Indices-API empowers developers to create next-generation applications that can analyze market trends, perform backtesting, and execute trades based on real-time data.

One of the standout features of the Indices-API is its ability to deliver OHLC data, which is crucial for traders who rely on candlestick patterns and other technical analysis methods. The API's endpoints are designed to be user-friendly, allowing developers to easily retrieve the data they need without extensive setup or configuration.

Key Features and Endpoints

The Indices-API offers a variety of endpoints that cater to different data needs. Here are some of the key features:

Latest Rates Endpoint: This endpoint provides real-time exchange rate data, updated based on your subscription plan. Depending on your plan, you can receive updates every 60 minutes or every 10 minutes.
Historical Rates Endpoint: Access historical rates for the Kospi 200 Index and other indices dating back to October 2024. You can query this data by appending a date in the format YYYY-MM-DD.
Convert Endpoint: This endpoint allows you to convert any amount from one currency to another, facilitating easy financial calculations.
Time-Series Endpoint: Query the API for daily historical rates between two dates of your choice, providing insights into market trends over time.
Fluctuation Endpoint: Retrieve information about how indices fluctuate on a day-to-day basis, which is essential for understanding market volatility.
Open/High/Low/Close (OHLC) Price Endpoint: This endpoint allows you to query the API to get the open, high, low, and close prices for the Kospi 200 Index, which is critical for technical analysis.
API Key: Your unique API key is required to access the API, ensuring secure and authorized usage.
API Response: The API returns exchange rates relative to USD by default, with all data structured in a consistent JSON format.
Supported Symbols Endpoint: This endpoint provides a constantly updated list of all available indices and their specifications, ensuring you have access to the latest data.

List of Symbols

The Indices-API provides access to a diverse range of index symbols, including the Kospi 200 Index. For a complete list of all supported symbols and their specifications, refer to the Indices-API Supported Symbols page.

API Endpoint Examples and Responses

Latest Rates Endpoint

To retrieve real-time exchange rates for the Kospi 200 Index, you can use the Latest Rates Endpoint. Below is an example of a successful response:

{
"success": true,
"timestamp": 1780188764,
"base": "USD",
"date": "2026-05-31",
"rates": {
"KS200": 0.00029
},
"unit": "per index"
}

Historical Rates Endpoint

Accessing historical exchange rates is essential for backtesting trading strategies. Here’s an example response from the Historical Rates Endpoint:

{
"success": true,
"timestamp": 1780102364,
"base": "USD",
"date": "2026-05-30",
"rates": {
"KS200": 0.00028
},
"unit": "per index"
}

Time-Series Endpoint

The Time-Series Endpoint allows you to analyze exchange rates over a specific period. Here’s an example response:

{
"success": true,
"timeseries": true,
"start_date": "2026-05-24",
"end_date": "2026-05-31",
"base": "USD",
"rates": {
"2026-05-24": {
"KS200": 0.00028
},
"2026-05-31": {
"KS200": 0.00029
}
},
"unit": "per index"
}

Convert Endpoint

To convert amounts between currencies, you can use the Convert Endpoint. Here’s an example response:

{
"success": true,
"query": {
"from": "USD",
"to": "KS200",
"amount": 1000
},
"info": {
"timestamp": 1780188764,
"rate": 0.00029
},
"result": 0.29,
"unit": "per index"
}

Fluctuation Endpoint

The Fluctuation Endpoint is useful for tracking rate changes over time. Here’s an example response:

{
"success": true,
"fluctuation": true,
"start_date": "2026-05-24",
"end_date": "2026-05-31",
"base": "USD",
"rates": {
"KS200": {
"start_rate": 0.00028,
"end_rate": 0.00029,
"change": 1.0e-5,
"change_pct": 3.57
}
},
"unit": "per index"
}

OHLC (Open/High/Low/Close) Endpoint

To retrieve OHLC data for the Kospi 200 Index, you can use the OHLC Price Endpoint. Here’s an example response:

{
"success": true,
"timestamp": 1780188764,
"base": "USD",
"date": "2026-05-31",
"rates": {
"KS200": {
"open": 0.00028,
"high": 0.00029,
"low": 0.00027,
"close": 0.00029
}
},
"unit": "per index"
}

Bid/Ask Endpoint

The Bid/Ask Endpoint provides current bid and ask prices for the Kospi 200 Index. Here’s an example response:

{
"success": true,
"timestamp": 1780188764,
"base": "USD",
"date": "2026-05-31",
"rates": {
"KS200": {
"bid": 0.00028,
"ask": 0.00029,
"spread": 1.0e-5
}
},
"unit": "per index"
}

Integration Tips

Integrating the Indices-API into your applications can significantly enhance your trading analysis capabilities. Here are some tips to ensure a smooth integration:

Authentication: Ensure you securely store your API key and include it in every request to authenticate your access.
Rate Limiting: Be mindful of the API's rate limits based on your subscription plan to avoid service interruptions.
Error Handling: Implement robust error handling to manage API response errors gracefully, allowing for retries or fallback mechanisms.
Data Caching: Consider caching frequently accessed data to improve performance and reduce the number of API calls.
Security Best Practices: Always use HTTPS for API requests to ensure data security during transmission.

Conclusion

In conclusion, the Indices-API provides a powerful and flexible solution for retrieving Kospi 200 Index OHLC data, essential for advanced trading analysis and quantitative research. By leveraging the API's various endpoints, developers can access real-time and historical data, enabling them to build sophisticated trading strategies and analytical tools. The ability to retrieve OHLC data, along with other features such as historical rates and fluctuation tracking, positions the Indices-API as a valuable resource for any developer in the financial sector.

For more information on how to get started, visit the Indices-API Documentation and explore the Indices-API Supported Symbols page for a complete list of available indices. With the right tools and data, you can enhance your trading strategies and make informed decisions in the dynamic world of finance.

Ready to use Indices-API?

Try it now!