You can now view and manage your limits for Amazon API Gateway using AWS Service Quotas. Quotas, also referred to as limits, are the maximum number of resources that you can create in an AWS account. With API Gateway’s integration with AWS Service Quotas, you can view and manage your quotas easily and at scale as your API workloads grow.  

from Recent Announcements https://aws.amazon.com/about-aws/whats-new/2019/11/manage-amazon-api-gateway-limits-with-aws-service-quotas/