i4things provide open source Node/Thing API for data delivery and notifications receiving and also a open source REST Display/Consume API for data consuming/displaying and notifications sending.
Extreme Performance Push Consuming API ( real-time streaming) is also available on request - if required please feel free to contact us.
Please visit our GitHub address for latest docs/libs and APIs: I4THINGS GitHub Repositories
You can also find ready to go examples directly here: I4THINGS Examples