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fix: RPC fallback transports and native balance display for weth wrappers - #5
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Root cause of "can't send WBNB even though I have BNB": the app builds every wagmi transport from
rpcUrls[0]only, and BSC Testnet's first RPC (bsc-testnet-rpc.publicnode.com) is currently returning 503s. Every chapel read — balance multicall,isWeth(), hostfeeToken— failed, so the form fell back to an empty balance and blocked the send with "Insufficient funds". The weth/native logic itself was already correct.wagmi.ts: transports now use viem'sfallback()across all configuredrpcUrlsinstead of only the first, so one flaky endpoint no longer zeroes out balances or blocks sends chain-wide.evm-networks.ts: BSC Testnet RPC order now starts withdata-seed-prebsc-1-s1.bnbchain.org(verified serving the balance multicall and contract reads), keeping publicnode as a fallback. Also fixes the SDK path (EvmChain.createusesrpcUrls[0]).balance-helper.ts: forwrapped-hfttokens withweth: true, the form balance now shows the chain's native symbol and value (e.g.tBNB) instead of the wrapper's registry symbol, since that is what the user actually spends. Non-weth wrappers keep showing the underlying ERC20 balance.Verified the exact multicall
getEthBalancerequest andisWeth()read against the new primary RPC, and that the transport fallback walks all four endpoints in order. Type-check clean, 110 tests pass.