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You are adding the package so the rest of these docs can run. The SDK talks to a chain. You still need an RPC when you build the client. Reads work with that alone. Writes need a wallet, and they spend the market’s collateral — USDC on Base and Polygon for a question like “Will ETH be above $5,000 at year end?”
React apps also need react, then import @voiz-digital/markets-sdk/react. In code, the RPC is a publicClient. Writes also need a walletClient or sendCalls.

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Pick React if you have a React tree. Otherwise construct the client with viem.