Solana RPC that answers only your servers.

# Standard Solana JSON-RPC. No Authorization header, no key in the URL.
RPC="http://88.216.36.108:7999"

curl -fsS -X POST "$RPC" -H 'content-type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"getLatestBlockhash","params":[{"commitment":"confirmed"}]}'

# Nothing back and the connection closed? That address is not on your list.

import { Connection } from "@solana/web3.js";

// WebSocket is on the same port as HTTP, so set wsEndpoint:
// web3.js would otherwise dial the next port up.
const connection = new Connection("http://88.216.36.108:7999", {
  commitment: "confirmed",
  wsEndpoint: "ws://88.216.36.108:7999",
});

// One after another, not in parallel: each open socket uses one of your connections.
const slot = await connection.getSlot();
const { blockhash } = await connection.getLatestBlockhash();
console.log(slot, blockhash);

# Same host, same port: the proxy upgrades the connection in place.
wscat -c ws://88.216.36.108:7999 \
  -x '{"jsonrpc":"2.0","id":1,"method":"slotSubscribe"}' -w 30

# A session with no traffic for 300 seconds is closed.
# A live subscription counts as traffic.