Get latest Solana token transfers

I need to get the latest transactions that have Solana token transfers. For this I tried out the blockSubscribe WSS method but it seems to be throwing errors. I am using Alchemy WSS on the mainnet for my purpose.

[Symbol(kType)]: 'message',[Symbol(kData)]: '{"id":"1","jsonrpc":"2.0","error":{"code":-32602,"message":"Invalid/Unspported params for blockSubscribe."}}'

I am not sure what am doing wrong here as I am just following what the docs said here.

Below is my code -

const socket = new WebSocket(WSS_ENDPOINT);socket.addEventListener("open", () => {  const subscribeMessage = {    jsonrpc: "2.0",    id: "1",    method: "blockSubscribe",    params: [{ filter: "all" }],  };  console.log("WSS stream started");  const messageString = JSON.stringify(subscribeMessage);  socket.send(messageString);});