The guide below explains in detail how you can make your first request to the proxy-endpoints. Just follow the steps.
Create an account
Firstly you have to signup and create an account. Now you are able to create an API-Key and to subscribe to a pre-defined or custom plan.
Subscribe to a plan
Choose a plan. Go to your dashboard and select a pre-defined or custom plan. After subscribing you are able to make requests to every endpoint. But keep in mind, only 100 requests per hour are possible.