solmul
is a solana rpc multiplexer, which sends the same requests to multiple validators.
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for all rpc calls except send transaction, the first response is sent back.
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for all subscription calls, the notification is inspected by looking at the slot number - and only the notification with slot greater than the last seen slot number is sent back.
go get github.com/foonetic/solmul@latest
solmul -u mainnet-beta -u mainnet-beta-serum