I believe blastr is write-only (you write there, it will spread through other relays), but nostr-proxy seems able to do read and write:

https://github.com/Dolu89/nostr-proxy

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This looks awesome. So the benefit is your Nostr client only needs to poll the single websocket, which should reduce bandwidth (as the node.js server does the heavy lifting) and maybe even saves some battery life?

Exactly