Metamask RPC API Equivalent: Retrieving Ethereum Balance Using CURL

As a Metamask user, you have probably encountered many situations where you need to query your Ethereum wallet balance. While Metamask provides an official RPC (Remote Procedure Call) API for interacting with the Ethereum network, accessing your balance through this interface can be cumbersome and buggy. In this article, we will explore alternative approaches using CURL on the command line, which may offer an easier way to retrieve your Ethereum balance.

Why Metamask’s RPC interface is complicated

Before we dive into the alternatives, let’s quickly take a look at why Metamask’s RPC interface can be intimidating:

• Complexity: The official API has multiple steps and requires proper authentication.

• Fee Limitation: Metamask may limit certain requests to prevent abuse.

CURL Equivalent: Get Ethereum Balance

Assuming you have a Metamask wallet connected, we will show you how to get your balance using CURL from the command line. We assume you are running this on Linux or macOS (using “curl” and “ssh-agent”).

Step 1: Configure the SSH Agent

To use CURL with your Metamask wallet, you need to configure the SSH agent properly.

Create a new SSH key pair
ssh-keygen -t ed25519 -b 256

• Create a new file named .ssh/id_ed25519 in your home directory.

• Add the public part of your key to the ~/.ssh/authorized_keys' file.

On Ubuntu-based systems (Debian or Ubuntu)
sudo apt-get update && sudo apt-get install -y libssl-dev curl

• For other Linux distributions: Install libcurl4-openssl-devusing a package manager such asaptordnf`.

Step 3: Create the Curl command

Now that you have everything set up, let’s create the CURL command to retrieve your Ethereum balance.

Connect to the Metamask RPC server with your private key (not public)
curl -X POST \
 \
-H 'Content-Type: application/json' \
-u "$METAMASK_PRIVATE_KEY" \
-d '{"action": "balance", "params": {"from": "0x..."}}'

Replace “0x…” with the hexadecimal address of your Ethereum wallet.

Step 4: Handling Errors and Exceptions

When using CURL, be prepared for possible errors or exceptions. Be sure to handle these situations appropriately, including logging relevant information.

Verify that the connection was successful
if [ $? -ne 0]; then
echo "Error: Failed to connect to Metamask RPC server"
f

Step 5: Check your balance

To check your balance, you can use the same method to send a request.

Get your current balance using curl
curl -X GET \

This should return your current Ethereum balance in decimal format. If successful, you will see the following output:

Balance: 1000.00 Ether

Congratulations! You have successfully retrieved your Ethereum balance using CURL with the Metamask RPC API equivalent.

Conclusion

While accessing your Ethereum balance directly through the official RPC interface can be challenging due to its complexity and rate-limiting features, using CURL from the command line offers a simpler alternative. By following the steps below, you can efficiently retrieve your Ethereum balance on your local machine.

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