Rest API Endpoint for Automated Test Runs does not work

API Page: /projects/{project_id}/test-runs/search/automated

When I run the following curl, I got an error:

curl \
   -H 'Accepts: application/json' \
   -H 'Content-Type: application/json' \
   -u [key]
   -X POST \
   -d '[]' \
   https://[team].spiraservice.net/services/v6_0/RestService.svc/projects/{project_id}/test-cases/test-runs/search/automated?starting_row\=1\&number_of_rows\=10

I get the following response:

"The passed in 'starting_row' needs to be an integer"

The workaround is hit each individual Run's endpoint, but that seems like it'll be taxing on the server.