Service Clients#

The Globus SDK provides a client class for every public Globus API. Each client object takes authentication credentials from config files, environment variables, or programmatically via GlobusAuthorizers.

Once instantiated, a Client gives you high-level interface to make API calls, without needing to know Globus API endpoints or their various parameters.

For example, you could use the TransferClient to list your task history very simply:

from globus_sdk import TransferClient, AccessTokenAuthorizer

# you must have a valid transfer token for this to work
tc = TransferClient(

print("My Last 25 Tasks:")
# `filter` to get Delete Tasks (default is just Transfer Tasks)
for task in tc.task_list(num_results=25, filter="type:TRANSFER,DELETE"):
    print(task["task_id"], task["type"], task["status"])


Multi-Thread and Multi-Process Safety

Each Globus SDK client class holds a networking session object to interact with the Globus API. Using a previously created service client object after forking or between multiple threads should be considered unsafe. In multi-processing applications, it is recommended to create service client objects after process forking and to ensure that there is only one service client instance created per process.