Hi Fred,
Thanks for the post and our sincere apologies for the delay in response.
At present we do not have an option to delete a single account using RestAPI. But this feature is very much available in our road-map. Our team is working on many enhancements to the RestAPI feature and it should be rolled out in the next few months. You can expect this option to be available by the third quarter of this year tentatively.
Do contact us if you have any other questions/feedback.