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Configure funding to use Golem Base

Disclaimer: This guide is provided for informational and educational purposes only. Golem Base is an experimental, pre-production testnet platform intended for developers and technically proficient users. Terms and conditions apply: glm.zone/base-toc

Step 0: Organize a Wallet for Ethereum Testnet

We recommend starting with MetaMask as your browser-based wallet. You can install it here; simply click the Get Metamask link and follow the steps for getting started by agreeing to the terms and then clicking Create a new wallet. (However, you can use any other browser-based wallet as well.)

Step 1: Get Test ETH on Holesky

First, configure your Wallet to use Holesky Testnet.

  1. Open the MetaMask extension
  2. Click the Ethereum Mainnet icon; a box should pop up listing networks. Scroll to the bottom of this box and click Add a custom network.
  3. In the Add a custom network box, fill it in with the following: Network name: Holesky Default RPC URL: https://ethereum-holesky.publicnode.com Chain ID: 17000 Currency symbol: ETH Block explorer URL: https://holesky.etherscan.io/

Grab some test ETH from any public Holesky faucet. (i.e. Google, Holesky proof of work) You'll bridge those test tokens to Golem Base Testnet “Erech” in the next step.

Step 2: Bridge Your ETH to Golem Base L2 “Erech”

Transfer your test ETH to Golem Base bridge smart contract to move test ETH from Holesky to Golem Base L2:

  1. In your wallet, select the Holesky network and click Send.
  2. Copy the following into the To box: 0x54D6C1435ac7B90a5d46d01EE2f22Ed6fF270ED3 (This is a direct bridge contract address).
  3. Click Continue.
  4. A Transaction Request box will open. Click Confirm.

This transaction bridges your test ETH from Holesky to Golem Base L2 testnet "Erech" automatically. The bridging process typically takes just a few minutes

Step 3: Add Golem Base Testnet “Erech” to MetaMask / Wallet

  1. Follow the same steps as earlier for adding a network and use the following: Network name: Golem Base L2 Testnet-001 "Erech" Default RPC URL: https://execution.holesky.l2.gobas.me Chain ID: 393530 Currency symbol: ETH Block explorer URL: https://explorer.golem-base.io
  2. Click Save. You should see a message at the bottom of the screen that the network was successfully added.

You can now switch between networks by clicking the network name in the upper-left corner and choosing one from the box that opens.

Step 4: Test Your L2 Setup

Let's verify everything is working:

  • Switch your wallet's network to Golem Base L2 Testnet-001 "Erech".
  • Tip: You should see the amount you sent in the previous step.
  • Optionally, you can test that the L2 Testnet setup is correct by sending a small amount of test ETH (like 0.001) to your own address.

Visit Golem Base block explorer at explorer.golem-base.io and look up your wallet address. You should see your transaction in the list, confirming you've successfully completed your first interaction with Golem Base!

Step 5: Bridge from L2 to L3 "Kaolin"

Now let's move some test ETH from L2 "Erech" to L3 "Kaolin":

  • While still on the "Erech" network, send the desired amount of your L2 test ETH to L3 bridge: 0x5c857718caea1f6e9b0a7adf1415d0b98b6498d0

  • This will bridge your test ETH from L2 to Golem Base L3 testnet "Kaolin"

  • You can track your bridge transactions using bridging monitoring tool:

  • Visit https://bridgette.kaolin.holesky.golem-base.io/ to check if your L2→L3 bridge transaction is still pending or has been finalized. You’ll see a list of recent transactions associated with your wallet address.

Step 6: Add Golem Base L3 Testnet to MetaMask / Wallet

Set up Golem Base L3 in your MetaMask / Wallet by adding a new network with these details:

Step 7: Verify Your L3 Setup

Let's check that your L3 setup is working:

  • Switch your wallet's network to "Golem Base L3 Testnet Kaolin"
  • After the bridging process is successful (typically less than a minute), you should see the test ETH in your wallet on L3

Step 8: Explore the Golem Base Ecosystem

Congratulations! You've now successfully:

  • Bridged test ETH from Ethereum Holesky testnet to Golem Base L2 "Erech"
  • Bridged from Golem Base L2 testnet "Erech" to Golem Base L3 testnet "Kaolin"
  • Now you can experiment with Golem Base L3 testnet either by:
  • Checking out dPaste - simple application built on top of Golem Base that allows you to save and share notes.
  • Create your own app - by using Golem Base Documentation.

  • Wish to learn more?

    Golem Base introduces a novel architectural model for decentralized data infrastructure — designed to be modular, Ethereum-native, and accessible across both Web2 and Web3.

    For a complete overview:
    Read the Litepaper (PDF)

    It covers:

    • The structure and role of DB-Chains
    • How Golem Base aligns with Ethereum Layer 2/3 philosophy
    • Potential real-world use cases

    Golem Base Origins

    Golem Base was born from a need inside Golem Network — and grew into its own thing. Built by an independent team committed to the idea that data autonomy should be the norm, not the exception. Read more

  • Join the Community

    Stay connected and get help as you explore Golem Base.

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