Factbird has a fully open API which is automatically documented and updated. Click on the link below to see the latest version:
https://api.cloud.factbird.com/v1/docs/
To make it more easy to digest, we have a few basic examples available on our Postman workspace: https://www.postman.com/factbird/factbird/collection/6508ae990c7db51b58b3cb24
For information on how to connect/authenticate to the API see: OAuth2 API keys