get https://{youraccountname}.api-us1.com/api/3/import/bulk_import
Add a short delay between creating a bulk import and calling for it's statusIf this endpoint is called immediately (less than a second) after a bulk import call, the
statusin the return may befalse(a boolean), because the system has not yet set a status on the batch.
After using the POST endpoint to send bulk data, you can use this endpoint to monitor progress. This endpoint only returns aggregate progress data.  The response is a JSON map of daily summaries of outstanding and recentlyCompleted batch jobs. Recently completed is a rolling window of the last seven days.
If you want specific details, register for a callback when sending the bulk job OR save the batchId and use the info endpoint.
{
  "outstanding":[
    {"forDate":"2021-06-01","batches":"333","contacts":"83250"}
  ],
  "recentlyCompleted":[
    {"forDate":"2021-06-01","batches":"17","contacts":"4250"},
    {"forDate":"2021-06-02","batches":"50","contacts":"12500"}
  ]
}