Available versions are:

master [default]

v2

v1

Every request should specify an Accept header that pins the api version. Version master is bleeding edge, changes regularly, and makes no guarantees (performance, backwards compatibility, stability, documentation, etc.). Beware, if you omit version it defaults to master.

The docs here are for v2

Example:

curl -i -XGET -H "Accept: application/vnd.littlebits.v2+json" ...