getCode instead of balance

TODO.md

@@ -100,3 +100,4 @@
 - [ ] flashbots specific methods
   - [ ] flashbots protect fast mode or not? probably fast matches most user's needs, but no reverts is nice.
   - [ ] https://docs.flashbots.net/flashbots-auction/searchers/advanced/rpc-endpoint#authentication maybe have per-user keys. or pass their header on if its set
+- [ ] if no redis set, but public rate limits are set, exit with an error

web3-proxy/src/connection.rs

@@ -199,7 +199,7 @@ impl Web3Connection {
             .wait_for_request_handle()
             .await
             .request(
-                "eth_getBalance",
+                "eth_getCode",
                 ("0xdead00000000000000000000000000000000beef", "0x1"),
             )
             .await;