Hi - is there any documentation regarding the API requests to get the pricing of some services (especially Virtual Machine) on AWS, Azure and GCP?

Hello, here you can see the examples: https://www.infracost.io/docs/supported_resources/cloud_pricing_api/

Hello Vadim - with that page I managed to build an API request for AWS and I was now trying to do the same for Azure, but I'm having some problems. Is there any other source specific for Azure? Thanks in advance.

Unfortunately no, but you can look at CLI's cost components to get an idea which values you can pass: https://github.com/infracost/infracost/blob/master/internal/resources/azure/linux_virtual_machine.go#L94-L102