Thanks to the wonderful work of Doby Rahnev, the Confidence Database is now out as a resource in Nature Human Behaviour. More than 80 authors from all over the world contributed their datasets. The database, which is still growing, includes more than 8,700 participants (almost 4 million trials).
The paper can be accessed here, and its preprint (free) here.
To tap directly into the database, just visit the OSF page!