A Guide to Fetching Advanced Copper Index (XCU_ACI) Historical Prices with this API

In the ever-evolving landscape of metal markets, the ability to access real-time and historical data is crucial for developers and analysts alike. The Metals-API offers a robust solution for fetching advanced copper index (XCU_ACI) historical prices, enabling users to harness the power of data analytics and insights. This guide will delve into the intricacies of the Metals-API, exploring its capabilities, endpoints, and practical applications in the context of copper and other metals.

About Copper (XCU)

Copper, represented by the symbol XCU, is a fundamental metal in various industries, including construction, electronics, and renewable energy. As the world embraces digital transformation, the copper market is also witnessing significant changes driven by technological innovation and advancement. The integration of smart technologies and data analytics is reshaping how market participants interact with copper prices, allowing for more informed decision-making.

As we explore the potential of the Metals-API, it's essential to consider how this tool can empower developers to build next-generation applications that leverage real-time metals data. The API not only provides access to current prices but also historical data dating back to 2019, making it an invaluable resource for market analysis and forecasting.

API Description

The Metals-API is designed to deliver accurate and timely information about metal prices, including copper. With its user-friendly interface and comprehensive documentation, developers can easily integrate the API into their applications. The API supports various endpoints that cater to different needs, from fetching the latest rates to accessing historical data and performing currency conversions.

For detailed information on how to use the API, refer to the Metals-API Documentation. This resource provides a thorough overview of the API's capabilities, including authentication, response formats, and error handling.

Key Features and Endpoints

The Metals-API boasts a variety of endpoints, each designed to serve specific purposes. Below, we explore some of the key features and their potential applications:

Latest Rates Endpoint: This endpoint provides real-time exchange rate data for metals, including copper. Depending on your subscription plan, the API updates this information every 60 minutes or every 10 minutes, ensuring that users have access to the most current market data.
Historical Rates Endpoint: Users can access historical rates for most currencies dating back to 2019. By appending a specific date (YYYY-MM-DD) to the endpoint, developers can retrieve historical price data for copper and other metals.
Bid and Ask Endpoint: This powerful feature allows users to retrieve real-time bid and ask prices for metals. Understanding the bid-ask spread is crucial for traders and analysts looking to make informed decisions in the market.
Convert Endpoint: The Metals-API includes a currency conversion endpoint, enabling users to convert any amount from one metal to another or to/from USD. This feature is particularly useful for those dealing with international transactions.
Time-Series Endpoint: This endpoint allows users to query the API for daily historical rates between two dates of their choice. It is ideal for analyzing trends over specific periods, providing insights into price movements.
Fluctuation Endpoint: Users can track how metal prices fluctuate on a day-to-day basis using this endpoint. It provides valuable information for understanding market volatility and making strategic decisions.
Carat Endpoint: This endpoint allows users to retrieve information about gold rates by carat, which is essential for jewelers and those in the jewelry industry.
Lowest/Highest Price Endpoint: Users can query the API to get the lowest and highest prices for a specific date, providing insights into market extremes.
Open/High/Low/Close (OHLC) Price Endpoint: This endpoint provides open, high, low, and close prices for a specific date, which is crucial for technical analysis.
Historical LME Endpoint: This endpoint offers access to historical rates for LME symbols dating back to 2008, allowing users to analyze long-term trends.
API Key: Users must pass their unique API key into the API base URL's access_key parameter to authenticate their requests.
API Response: The Metals-API delivers exchange rates relative to USD by default, ensuring consistency in data interpretation.
Available Endpoints: The API comes with 14 endpoints, each providing different functionalities tailored to user needs.
Supported Symbols Endpoint: This endpoint returns all available currencies and metals, ensuring users can access the latest information on supported symbols.

List of Symbols

The Metals-API provides access to a comprehensive range of metal symbols, including copper (XCU). For a complete list of all supported symbols and their specifications, refer to the Metals-API Supported Symbols page.

API Endpoint Examples and Responses

Understanding the API's response structure is crucial for effective integration. Below are examples of various endpoints and their corresponding JSON responses:

Latest Rates Endpoint

Get real-time exchange rates for all available metals.

{
"success": true,
"timestamp": 1780532256,
"base": "USD",
"date": "2026-06-04",
"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

Access historical exchange rates for any date since 1999.

{
"success": true,
"timestamp": 1780445856,
"base": "USD",
"date": "2026-06-03",
"rates": {
"XAU": 0.000485,
"XAG": 0.03825,
"XPT": 0.000915,
"XPD": 0.000748
},
"unit": "per troy ounce"
}

Time-series Endpoint

Get exchange rates for a specific time period.

{
"success": true,
"timeseries": true,
"start_date": "2026-05-28",
"end_date": "2026-06-04",
"base": "USD",
"rates": {
"2026-05-28": {
"XAU": 0.000485,
"XAG": 0.03825,
"XPT": 0.000915
},
"2026-05-30": {
"XAU": 0.000483,
"XAG": 0.0382,
"XPT": 0.000913
},
"2026-06-04": {
"XAU": 0.000482,
"XAG": 0.03815,
"XPT": 0.000912
}
},
"unit": "per troy ounce"
}

Convert Endpoint

Convert any amount from one metal to another or to/from USD.

{
"success": true,
"query": {
"from": "USD",
"to": "XAU",
"amount": 1000
},
"info": {
"timestamp": 1780532256,
"rate": 0.000482
},
"result": 0.482,
"unit": "troy ounces"
}

Fluctuation Endpoint

Track rate fluctuations between two dates.

{
"success": true,
"fluctuation": true,
"start_date": "2026-05-28",
"end_date": "2026-06-04",
"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"
}

OHLC (Open/High/Low/Close) Endpoint

Get OHLC data for a specific time period.

{
"success": true,
"timestamp": 1780532256,
"base": "USD",
"date": "2026-06-04",
"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"
}

Bid/Ask Endpoint

Get current bid and ask prices for metals.

{
"success": true,
"timestamp": 1780532256,
"base": "USD",
"date": "2026-06-04",
"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"
}

Conclusion

In conclusion, the Metals-API provides a powerful tool for developers and analysts looking to access advanced copper index (XCU_ACI) historical prices and other metal data. With its comprehensive set of endpoints, the API empowers users to perform detailed market analysis, track fluctuations, and make informed decisions based on real-time data.

By leveraging the capabilities of the Metals-API, developers can create innovative applications that integrate seamlessly with existing systems, enhancing the overall user experience. Whether you are interested in the latest rates, historical trends, or bid and ask prices, the Metals-API offers the flexibility and functionality needed to succeed in today's dynamic metal markets.

For more information on how to get started, visit the Metals-API Documentation and explore the various endpoints available. Additionally, check out the Metals-API Supported Symbols page for a complete list of metal symbols. With the right tools and insights, you can navigate the complexities of the metal markets with confidence.

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A Guide to Fetching Advanced Copper Index (XCU_ACI) Historical Prices with this API