how many API calls I have left

Not yet, but Airtable is working on it. 

"Second: How do we plan to enforce API limits?

Our goal is to balance the costs of heavy API usage with the impact on customers. If you exceed the monthly limit, you will continue to have access to our APIs, but see a lower rate limit for the remainder of the month. Once that month ends, your rate limit will go back to normal. We’re working to provide better ways to monitor your current usage in workspace settings and will have more to share soon."

Source

Are the new pricing methods already in effect?

Yes they are. 

Hello, any news on this?
I saw in the community that many users ask for this feature to be implemented and there is not response from Airtable about if and when it will be added.

Thank you