This will allow you to get all the sequences from the account.
TypeParametersValues
POSTcmd*retrieve_account_sequences

* Required fields Here is an example:

'actions' => [
    '0' => [
        'cmd' => 'retrieve_account_sequences'
    ]
]

Here are the results returned by the request:

ParametersValues
account_sequencesString (JSON encoded array containing the names of all the sequences in your account, empty array if no sequences)
  Example of the returned message:
{
    "status":"Success",
    "account_sequences":[
        "Sequence name 1",
        "Sequence name 2"
    ]
}