Adding ether tuts to billing (#460)

Author: MichaelMacaulay

website/pages/en/billing.mdx

@@ -153,6 +153,50 @@ This is how you can purchase GRT on Uniswap.
 
 You can learn more about getting GRT on Uniswap [here](https://support.uniswap.org/hc/en-us/articles/8370549680909-How-to-Swap-Tokens-).
 
+## Getting Ethereum
+
+This section will show you how to get Ethereum (ETH) to pay for transaction fees or gas costs. ETH is necessary to execute operations on the Ethereum network such as transferring tokens or interacting with contracts.
+
+### Coinbase
+
+This will be a step by step guide for purchasing ETH on Coinbase.
+
+1.  Go to [Coinbase](https://www.coinbase.com/) and create an account.
+2.  Once you have created an account, verify your identity through a process known as KYC (or Know Your Customer). This is a standard procedure for all centralized or custodial crypto exchanges.
+3.  Once you have verified your identity, purchase ETH by clicking on the "Buy/Sell" button on the top right of the page.
+4.  Select the currency you want to purchase. Select ETH.
+5.  Select your preferred payment method.
+6.  Enter the amount of ETH you want to purchase.
+7.  Review your purchase and click "Buy ETH".
+8.  Confirm your purchase and you will have successfully purchased ETH.
+9.  You can transfer the ETH from your Coinbase account to your crypto wallet such as [MetaMask](https://metamask.io/).
+    - To transfer the ETH to your crypto wallet, click on the "Accounts" button on the top right of the page.
+    - Click on the "Send" button next to the ETH account.
+    - Enter the amount of ETH you want to send and the wallet address you want to send it to.
+    - Click "Continue" and confirm your transaction.
+
+You can learn more about getting ETH on Coinbase [here](https://help.coinbase.com/en/coinbase/trading-and-funding/buying-selling-or-converting-crypto/how-do-i-buy-digital-currency).
+
+### Binance
+
+This will be a step by step guide for purchasing ETH on Binance.
+
+1.  Go to [Binance](https://www.binance.com/en) and create an account.
+2.  Once you have created an account, verify your identity through a process known as KYC (or Know Your Customer). This is a standard procedure for all centralized or custodial crypto exchanges.
+3.  Once you have verified your identity, purchase ETH by clicking on the "Buy Now" button on the homepage banner.
+4.  Select the currency you want to purchase. Select ETH.
+5.  Select your preferred payment method.
+6.  Enter the amount of ETH you want to purchase.
+7.  Review your purchase and click "Buy ETH".
+8.  Confirm your purchase and you will see your ETH in your Binance Spot Wallet.
+9.  You can withdraw the ETH from your account to your crypto wallet such as [MetaMask](https://metamask.io/).
+    - To withdraw the ETH to your crypto wallet, add your crypto wallet's address to the withdrawal whitelist.
+    - Click on the "wallet" button, click withdraw, and select ETH.
+    - Enter the amount of ETH you want to send and the whitelisted wallet address you want to send it to.
+    - Click "Continue" and confirm your transaction.
+
+You can learn more about getting ETH on Binance [here](https://www.binance.com/en/support/faq/how-to-buy-cryptocurrency-on-binance-homepage-400c38f5e0cd4b46a1d0805c296b5582).
+
 ## Arbitrum Bridge
 
 The billing contract is only designed to bridge GRT from Ethereum mainnet to the Arbitrum network. If you'd like to transfer your GRT from Arbitrum back to Ethereum mainnet, you'll need to use the [Arbitrum Bridge](https://bridge.arbitrum.io/?l2ChainId=42161).