Transmit 5.0 has been certified for use with Wasabi. To use Transmit with Wasabi, configure the Transmit app as shown below (screen shot for Transmit 5.0). The screen fields should be:
Protocol: Amazon S3
Port: 443 (default)
Access Key ID: Your Wasabi access key
Secret: Your Wasabi secret key
Remote Path: accept default or specify what you want
Note that this example discusses the use of Wasabi's us-east-1 storage region. To use other Wasabi storage regions, please use the appropriate Wasabi service URL as described in this article.