IMPORTANT: Call from the back-end.

This endpoint is used to check if a user owns a particular token (or any token of a particular collection). You will need to authenticate using your Mintology API Key, and also the Project ID that you set for one of your projects. If you do not specify a contract_address, we will use the contract associated with your project ID. If you do not specify a token_id, we will check if the wallet contain any tokens from the contract.

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