Creating a Live Bitcoin Price Chart Using Binance API (No API Key!) : Jean Rousseau

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April 28, 2024
Creating a Live Bitcoin Price Chart Using Binance API (No API Key!)
by: Jean Rousseau
blow post content copied from  Be on the Right Side of Change
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In this tutorial, we’ll learn how to create a simple live-updating Bitcoin price chart using the Binance API. This straightforward guide will cover all the necessary HTML, JavaScript, and CSS code required to get started with real-time cryptocurrency price tracking.

You don’t need much for this tutorial: ✅

  1. Basic understanding of HTML, CSS, and JavaScript.
  2. A modern web browser.

We’ll create a single HTML document that includes inline JavaScript and CSS. This approach ensures that you can easily copy, paste, and run the example without managing multiple files.

📈 Execution: To run the Bitcoin price checker, copy the entire HTML code into a file with a .html extension. Open this file in any modern web browser to see the live Bitcoin price updating every few seconds.

You can see it live right here:

Live Bitcoin Price Chart

Here’s the full HTML document with embedded CSS and JavaScript:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Live Bitcoin Price Chart</title>
    <style>
        body {
            font-family: Arial, sans-serif;
        }
        #chartContainer {
            height: 300px;
            width: 100%;
            margin: 20px auto;
            border: 1px solid #ccc;
        }
    </style>
</head>
<body>
    <div id="chartContainer"></div>
    <script src="https://canvasjs.com/assets/script/canvasjs.min.js"></script>
    <script>
        let priceDataPoints = [];

        function updateChartData() {
            fetch('https://api.binance.com/api/v3/ticker/price?symbol=BTCUSDT')
                .then(response => response.json())
                .then(data => {
                    const btcPrice = parseFloat(data.price);
                    const currentTime = new Date();
                    priceDataPoints.push({ x: currentTime, y: btcPrice });
                    if (priceDataPoints.length > 20) {
                        priceDataPoints.shift();
                    }
                    updateChart();
                }).catch(error => console.error("Error fetching BTC price:", error));
        }

        function updateChart() {
            let chart = new CanvasJS.Chart("chartContainer", {
                title: {
                    text: "Live Bitcoin Price"
                },
                axisX: {
                    title: "Time",
                    valueFormatString: "HH:mm:ss",
                    labelAngle: -30
                },
                axisY: {
                    title: "Price (USD)",
                    includeZero: false,
                    prefix: "$"
                },
                data: [{
                    type: "line",
                    xValueType: "dateTime",
                    dataPoints: priceDataPoints
                }]
            });
            chart.render();
        }

        updateChartData(); // Initial call to populate the chart
        setInterval(updateChartData, 5000); // Update chart every 5 seconds
    </script>
</body>
</html>

The code works as follows:

HTML Structure: We have a div element where the chart will be displayed.

CSS Styling: Simple styles are applied to ensure the chart container is visually defined.

JavaScript for Live Data:

  • Fetching Data: The JavaScript uses the fetch API to pull live Bitcoin prices from Binance’s public API endpoint.
  • Updating the Chart: We use CanvasJS (a third-party library) to render the price chart. New data points are added every 5 seconds, and the oldest data points are removed to keep the chart clean and readable.
  • CanvasJS Library: This is a powerful and easy-to-use chart library, which we include from a CDN. It simplifies drawing the live chart.

April 28, 2024 at 07:44PM
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