Hello everyone,
I want to use the associations V4 in order to create a batch of associations between contacts and companies. Is there a limit to be respected ? I know that batch of contacts(creation/update…) has a limit of 10 records for example
Hey, @YouAssa95 
It is somewhat buried, but here is the link that lists the batch limits. Scroll to batch actions 
(I added the relevant details here)
Batch actions
Each object provides batch endpoints that let you create, read, update, and archive multiple object records in a single request. Batch endpoints have a limit of 100 records per call except for creating and updating contacts, which are limited to 10 records per call.
Have a wonderful day! — Jaycee