list-backends.sh

$ sls invoke -f list_backends  | python -c "import sys,json; print(json.loads(sys.stdin.read())['body'])" | python -m "json.tool"
[
    {
        "block_number": 7849400.0,
        "url": "http://kovan-parity-1.rumblefishdev.com:8545",
        "is_healthy": true,
        "is_leader": false,
        "when_added": "2018-07-02T11:50:49.281928"
    },
    {
        "block_number": 7849400.0,
        "url": "https://kovan.infura.io/kb56QStVQWIFv1n5fRfn",
        "is_healthy": true,
        "is_leader": true,
        "when_added": "2018-07-02T11:50:47.762447"
    }
]