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Yes, you're right, you can interact with a smart contract without having a wallet.
By connecting with a Provider, so you will only have read-only access to the Contract, without sending a transaction (Can’t alter the smart contract state).
By creating an instance of the contract:
Web3: https://web3js.readthedocs.io/en/v1.2.0/web3-eth-contract.html#
Ethers:...
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