The endpoint you have created to accept webhooks from Wyre is unauthenticated because the webhooks do not have an authentication mechanism. You may wish to lock this endpoint down and only whitelist Wyre IPs, preventing the possibility of a DDoS attack.
Here are the IP addresses that you can whitelist:
52.36.189.92
52.27.236.228
34.208.229.152
Testwyre:
44.229.236.122
44.233.59.43
44.238.83.93