Yup.
```
> curl -L nostr.ingwie.me -H "Accept: application/nostr+json"
{"contact":"@ingwiephoenix:ingwie.me","description":"Just a relay I host for fun.","limitation":{"max_limit":500,"max_message_length":131072,"max_subscriptions":20},"name":"Just a relay","negentropy":1,"pubkey":"5e336907a3dda5cd58f11d162d8a4c9388f9cfb2f8dc4b469c8151e379c63bc9","software":"git+
https://github.com/hoytech/strfry.git","supported_nips":[1,2,4,9,11,22,28,40,70,77],"version":"1.0.4"}
```
It's right there in the Relay document (NIP-11)