Pace yourself To ensure efficient and consistent API performance, we've placed a limit of 5 transactions per second (TPS) across all KeyBank APIs, except for Commercial Accounts API which has a 10 TPS limit.API requests that exceed the rate limit receive an HTTP 429 response status code. If you've exceeded this limit, wait for at least 2 minutes before making another API call.KeyBank has a TPS threshold to maximize stability and performance. We understand that your consumption needs might not fit within those limits. To request an increased rate limit, contact your KeyBank Technical Account Manager.