When using a typical spellbook, a wizard must spend money on materials and ink to record new spells into their book. From the "Your Spellbook" sidebar of the wizard class in the Player's Handbook:
For each level of the spell, the process takes 2 hours and costs 50 gp. The cost represents material components you expend as you experiment with the spell to master it, as well as the fine inks you need to record it. Once you have spent this time and money, you can prepare the spell just like your other spells.
In Tasha's Cauldron of Everything, there is a wondrous magic item called the Crystalline Chronicle which functions as a spellbook. However, it is not a book, it is a crystal ball that psychically encodes the information:
While you are touching the crystal, you can retrieve and store information and spells within the crystal at the same rate as reading and writing. [...] It functions as a spellbook for you, with its spells and other writing psychically encoded within it.
It is not immediately evident to me that any fine inks are a necessary component of recording new spells within the Chronicle, but material components for the particular spells might be. Is the cost to the wizard the same if they are using the Chronicle instead of a normal spellbook? Does it matter if the particular spell does not have any material components to expend?