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On Flutter, AirService.sendEthereumRpcRequest exposes an EIP-1193-style surface for common RPC methods. Use it directly or wrap it for libraries like web3dart.
wagmi is for web React apps. For wagmi, see Wagmi integration and the Web SDK provider docs.

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Request and response shapes

See Reference (Flutter tab) for EthereumRpcRequest and EthereumRpcSuccessResponse.

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Examples

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eth_accounts and eth_chainId

final accountsRes = await airService.sendEthereumRpcRequest(
  EthereumRpcRequest(method: 'eth_accounts', params: []),
);
final chainRes = await airService.sendEthereumRpcRequest(
  EthereumRpcRequest(method: 'eth_chainId', params: []),
);

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eth_getBalance

final address = await airService.getAbstractAccountAddress();
if (address != null) {
  final res = await airService.sendEthereumRpcRequest(
    EthereumRpcRequest(
      method: 'eth_getBalance',
      params: [address, 'latest'],
    ),
  );
}

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Switch or add chain

await airService.sendEthereumRpcRequest(
  EthereumRpcRequest(
    method: 'wallet_switchEthereumChain',
    params: [
      {'chainId': '0x1'},
    ],
  ),
);

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web3dart

You can implement a thin adapter that forwards JsonRpc calls to sendEthereumRpcRequest. Keep the adapter in your app repo and test against your SDK version.

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Next steps