I’d be happy to help you solve your problem. Here’s an article with a step-by-step guide on how to get a Binance API signature for Ethereum transactions using Flutter:
Getting a Binance API Signature: A Step-by-Step Guide
The Binance API provides access to a variety of data streams and APIs, including real-time market data, trading information, and more. To work with the Binance API in your Flutter application, you need to obtain an API key and generate an API signature to verify your identity. In this article, we’ll walk you through the process of obtaining an Ethereum API signature using the “flutter_binance” package.
Prerequisites:
- You have a Binance account with sufficient funds.
- You’ve registered to use the Binance API on their website.
- You’ve received an API key and an API secret (client ID and client secret).
- You’ve set up the “flutter_binance” package in your Flutter project.
Step 1: Get the query parameters
When you are going to make a query to the Binance API, you need to include the query parameters in the API endpoint. In this case, we will use the Ethereum API endpoint to get the transaction information.
String queryParams = 'timestamp=' + DateTime.now().millisecondsSinceEpoch.toString();
This will generate a query parameter with a timestamp in milliseconds.
Step 2: Create an HTTP client
To make queries to the Binance API, you need to create an http client. For this purpose, we will use the http package.
import 'package:http/http.dart' as http;
Future getEthereumTransactionInfo() async {
final apiEndpoint = '
final headers = {
"x-api-key": "YOUR_API_KEY",
"x-api-secret": "YOUR_API_SECRET",
};
var response = await http.get(
Uri.parse(apiEndpoint),
headers: headers,
);
if (response.statusCode == 200) {
// Parse the JSON response
final jsonData = jsonDecode(response.body);
// Process the data as needed
print('Transaction details:');
print (jsonData);
// Return success message
return Scaffold (
AppBar: AppBar (
title: Text ("Ethereum transaction information"),
),
body: center (
child: column (
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text ("Transaction information successfully received!"),
Box (height: 20),
ElevatedButton(
pressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => CustomDialog()),
);
},
child: text ("Open custom dialog for further processing"),
),
],
),
),
);
} else {
// Handle errors
return Scaffold (
AppBar: AppBar (
title: Text ("An error occurred"),
),
body: center (
child: column (
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text ("An error occurred while submitting the request. Please check your API key and secret"),
Box (height: 20),
ElevatedButton(
pressed: () {
Navigator.pop(context);
},
child: text ("Return to previous screen"),
),
],
),
),
);
}
}
Step 3: Sign the request
To verify your identity and obtain an API signature, you must sign the request with your private key.
- Create a new file « private_key.pem » in the root directory of your project.
- Generate a private key using the « dart:convert » library or a tool like OpenSSL.
openssl genrsa -out private_key.pem 2048
3.