Yes, through wss://eclipse.pub/relay
It supports NIP-50 search filters, and actually proxies the search query to Bluesky's centralized search endpoint, so I don't need to do anything special to make search work exactly the same as on Bluesky itself.
For example:
```
nak req --search "hello world" wss://eclipse.pub/relay
```
You can also filter by #proxy tag to do a lookup of events by their AT URI:
```
nak req -t proxy=at://did:plc:zhbjlbmir5dganqhueg7y4i3/app.bsky.feed.post/3lbur7bam3k22 wss://eclipse.pub/relay
```
Example event: