Get the Spot availability across all regions.
GET /v2/spot/availability HTTP/1.1 Host: api.mlfoundry.com Authorization: Bearer fkey_<key> Accept: */*
Successful Response
[ { "fid": "auc_abc123456", "instance_type": "it_abc123456", "region": "us-central1-a", "capacity": 512, "last_instance_price": "$10.00" } ]