Do I need a paid plan to make use of websockets?

I want to set up a Solana websocket. Do I need one of Helius’s paid plans to make use of this feature?

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No paid plan is required to use standard Solana webSockets. The only paid webSockets are the geyser-enhanced ones, such as transactionSubscribe and accountSubscribe accessible via wss://atlas-mainnet.helius-rpc.com?api-key=<API_KEY>.