Getting a 404 on posting to API endpoint

I am trying out Raygun for the first time and from an unsupported language (Elixir).

When I POST to https://api.raygun.io I get a 404 response. It happens whether or not the X-ApiKey header is set to my key and whether or not I include a valid JSON payload or an empty one ( {} ). I get the same results POSTing from Postman (a REST API testing tool).

Am I missing something obvious?

Thanks.

---

Never mind. I was missing something obvious: https://api.raygun.io/entries

---