We offer our API-service under a Creative Commons - Attribution Non-Commercial license.
This means that it’s free as long as you attribute it to us and you are not making money from the data. If you are selling a product that uses our data we charge a fee.
The idea is that if you start making a lot of money using our data, we would like something in return. If you are just providing a free service, you can use our data freely.
Please make sure you credit us with a link if you use our data on your website or app. There is a paid service which grants higher rate limits, more data and different usage rights.
For more information about purchasing a paid account, please contact firstname.lastname@example.org.