The lookup API is created to validate addresses in The Netherlands, and Luxembourg. We are working hard on supporting more countries in the future.
If you need support for all countries we suggest to use the Normalised Search API.
You can use this API with any of our subscription types. Each single API call counts as one request. If you go over your quotum within your subscription package? You will get billed for each request you make unless you disable your API key from the dashboard.
Check the sidebar for all current countries that are supported and how to use this API within your application.
Run and try out in Postman: