This incident has been resolved.
Mar 17, 14:01 PDT
The API app has returned to normal. Sendwithus engineers are monitoring.
Mar 17, 12:51 PDT
Our internal systems have alerted us to an elevated number of request time outs on the API and Web Portal. The Sendwithus engineering team is investigating. Emails are still sending.
Mar 17, 10:29 PDT