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Here’s a code snippet that sends a transaction with ethers.js backed by portal.provider. 
// update portal to use your chain of choice
portal.updateChain('<chainReference>')

// get ethers.js Signer backed by portal.provider
const ethersProvider = new ethers.BrowserProvider(portal.provider)
const ethersSigner = await ethersProvider.getSigner()

// Send the transaction
const tx = await ethersSigner.sendTransaction({
  to: '<address>',
  value: ethers.parseEther('0.001'),
})

// wait for the transaction to be mined
const receipt = await tx.wait()
Let’s break it down. First, portal.updateChain is used to bind portal.provider to a specific EVM chain. It takes the chain’s CAIP-2 reference, for example 11155111 for Sepolia, as argument. portal.provider is then supplied to ethers.js BrowserProvider. The returned object is an ethers.js Provider and supports read-only requests to the chain. To be able to send a transaction we need a Signer which ethersProvider.getSigner returns. The next bit of code is ethers.js specific and uses ethersSigner.sendTransaction to send 0.001 ETH to the address specified. The code also waits for the transaction to be mined. That’s all! We’ve successfully used portal.provider and ethers.js to send a transaction!
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