Api without any authentication

I want to create an api which anybody can access.

Consider I want to run crud operations on 2-3 tables from the database, but the user should not require any authentication.

Thanks in advance.

You can enable anonymous access in your application and create a role for anonymous users.
The documentation provides an illustration of this approach.
Anonymous Access to Screens :: Jmix Documentation

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And in the REST part, this topic will be useful:
REST API - Anonymous Access - Support - Jmix

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