Get Polish Zoty (PLN) conversion rates using this API

Introduction

In today's fast-paced financial landscape, obtaining accurate and real-time conversion rates for currencies such as the Polish Zloty (PLN) is crucial for businesses, traders, and developers alike. The Metals-API provides a robust solution for accessing up-to-date exchange rates and historical data for various metals and currencies, including PLN. This blog post delves into the capabilities of the Metals-API, focusing on its innovative features, technical specifications, and practical applications for developers looking to integrate currency conversion functionalities into their applications.

Understanding the Metals-API

The Metals-API is a powerful tool designed to facilitate access to real-time and historical exchange rate data for metals and currencies. It empowers developers to create applications that require accurate financial data, enabling them to make informed decisions based on the latest market trends. The API's design emphasizes technological innovation, allowing for seamless integration and data analytics capabilities that can transform how businesses operate in the metal markets.

About Tellurium (TE)

When discussing Tellurium, it is essential to consider its role in the context of digital transformation within metal markets. As industries increasingly adopt smart technology and data analytics, the demand for real-time data has surged. The Metals-API stands at the forefront of this transformation, offering developers the tools needed to harness the power of data for better decision-making.

Technological advancements in the API allow for innovative applications, such as tracking price fluctuations, analyzing historical trends, and integrating with other financial systems. The future of metal markets is undoubtedly tied to the capabilities provided by APIs like Metals-API, which enable businesses to adapt to changing market conditions and consumer demands.

API Capabilities

The Metals-API offers a wide array of features and endpoints that cater to various needs in the financial sector. Below are some of the key functionalities that developers can leverage:

Latest Rates Endpoint

The Latest Rates Endpoint provides real-time exchange rate data for metals and currencies, updated at intervals depending on the user's subscription plan. This endpoint is essential for applications that require the most current pricing information, allowing users to make timely decisions based on market conditions.

{
"success": true,
"timestamp": 1786147816,
"base": "USD",
"date": "2026-08-08",
"rates": {
"XAU": 0.000482,
"XAG": 0.03815,
"XPT": 0.000912,
"XPD": 0.000744,
"XCU": 0.294118,
"XAL": 0.434783,
"XNI": 0.142857,
"XZN": 0.344828
},
"unit": "per troy ounce"
}

Historical Rates Endpoint

Accessing historical rates is crucial for trend analysis and forecasting. The Historical Rates Endpoint allows users to retrieve exchange rates for most currencies dating back to 2019. By appending a specific date to the API request, developers can analyze past market behavior and make predictions about future trends.

{
"success": true,
"timestamp": 1786061416,
"base": "USD",
"date": "2026-08-07",
"rates": {
"XAU": 0.000485,
"XAG": 0.03825,
"XPT": 0.000915,
"XPD": 0.000748
},
"unit": "per troy ounce"
}

Bid and Ask Endpoint

The Bid and Ask Endpoint is a powerful feature that provides real-time bid and ask prices for metals. This information is vital for traders who need to understand market depth and make informed buying or selling decisions. The bid price indicates the maximum price that a buyer is willing to pay, while the ask price is the minimum price a seller is willing to accept.

{
"success": true,
"timestamp": 1786147816,
"base": "USD",
"date": "2026-08-08",
"rates": {
"XAU": {
"bid": 0.000481,
"ask": 0.000483,
"spread": 2.0e-6
},
"XAG": {
"bid": 0.0381,
"ask": 0.0382,
"spread": 0.0001
},
"XPT": {
"bid": 0.000911,
"ask": 0.000913,
"spread": 2.0e-6
}
},
"unit": "per troy ounce"
}

Convert Endpoint

The Convert Endpoint allows users to convert any amount from one currency to another, including metals to USD and vice versa. This feature is particularly useful for applications that require dynamic currency conversion based on user input.

{
"success": true,
"query": {
"from": "USD",
"to": "XAU",
"amount": 1000
},
"info": {
"timestamp": 1786147816,
"rate": 0.000482
},
"result": 0.482,
"unit": "troy ounces"
}

Time-Series Endpoint

The Time-Series Endpoint enables users to query the API for daily historical rates between two specified dates. This functionality is essential for analyzing trends over time and understanding how market conditions have evolved.

{
"success": true,
"timeseries": true,
"start_date": "2026-08-01",
"end_date": "2026-08-08",
"base": "USD",
"rates": {
"2026-08-01": {
"XAU": 0.000485,
"XAG": 0.03825,
"XPT": 0.000915
},
"2026-08-03": {
"XAU": 0.000483,
"XAG": 0.0382,
"XPT": 0.000913
},
"2026-08-08": {
"XAU": 0.000482,
"XAG": 0.03815,
"XPT": 0.000912
}
},
"unit": "per troy ounce"
}

Fluctuation Endpoint

The Fluctuation Endpoint provides insights into how currencies fluctuate on a day-to-day basis. This feature is particularly useful for traders and analysts who need to track volatility and make informed decisions based on market dynamics.

{
"success": true,
"fluctuation": true,
"start_date": "2026-08-01",
"end_date": "2026-08-08",
"base": "USD",
"rates": {
"XAU": {
"start_rate": 0.000485,
"end_rate": 0.000482,
"change": -3.0e-6,
"change_pct": -0.62
},
"XAG": {
"start_rate": 0.03825,
"end_rate": 0.03815,
"change": -0.0001,
"change_pct": -0.26
},
"XPT": {
"start_rate": 0.000915,
"end_rate": 0.000912,
"change": -3.0e-6,
"change_pct": -0.33
}
},
"unit": "per troy ounce"
}

Open/High/Low/Close (OHLC) Price Endpoint

The OHLC Price Endpoint allows users to retrieve the open, high, low, and close prices for a specific time period. This data is crucial for traders who rely on candlestick charts and other technical analysis tools to make trading decisions.

{
"success": true,
"timestamp": 1786147816,
"base": "USD",
"date": "2026-08-08",
"rates": {
"XAU": {
"open": 0.000485,
"high": 0.000487,
"low": 0.000481,
"close": 0.000482
},
"XAG": {
"open": 0.03825,
"high": 0.0383,
"low": 0.0381,
"close": 0.03815
},
"XPT": {
"open": 0.000915,
"high": 0.000918,
"low": 0.00091,
"close": 0.000912
}
},
"unit": "per troy ounce"
}

Historical LME Endpoint

The Historical LME Endpoint provides access to historical rates for LME symbols dating back to 2008. This endpoint is particularly useful for businesses involved in trading metals on the London Metal Exchange, allowing them to analyze past performance and make strategic decisions.

API Key and Response Structure

To access the Metals-API, users must obtain an API Key, which is passed into the API base URL's access_key parameter. This key ensures that only authorized users can access the data, providing a layer of security for sensitive financial information. The API responses are structured in JSON format, making them easy to parse and integrate into various applications.

Practical Use Cases

The versatility of the Metals-API allows for numerous practical applications across different industries. Here are some examples:

• Financial Applications: Developers can create applications that provide real-time currency conversion for users, allowing them to make informed decisions when trading or investing in metals.
• Market Analysis Tools: Analysts can leverage the historical rates and fluctuation data to build tools that predict market trends and provide insights into price movements.
• E-commerce Platforms: Online retailers can integrate the API to display real-time pricing for products that involve precious metals, ensuring that customers receive accurate pricing information.

Conclusion

The Metals-API is an invaluable resource for developers seeking to integrate real-time and historical exchange rate data into their applications. With its wide range of features, including the Latest Rates, Historical Rates, and Conversion Endpoints, the API empowers users to make data-driven decisions in the fast-paced financial landscape. By leveraging the capabilities of the Metals-API, businesses can enhance their operations, improve customer experiences, and stay ahead of market trends.

For more detailed information, developers can refer to the Metals-API Documentation and explore the Metals-API Supported Symbols for a comprehensive list of available currencies and metals. The Metals-API Website serves as a central hub for accessing all the resources needed to effectively utilize this powerful API.