requestWriteContract: envelope type "0x2" included gasPrice

[myslajek]

SDK Affected

AppKit

Describe the bug
When trying to call write contract functions via appKit and MetaMask, I'm facing an error in the dialog as shown below:

Transaction error Invalid transaction envelope type: specified type "0x2" but included a gasPrice instead of maxFeePerGas and maxPriorityFeePerGas

This error occurs for all write functions in this contract: https://testnet.sonicscan.org/address/0x039e2fB66102314Ce7b64Ce5Ce3E5183bc94aD38#writeContract#F1.

The network I'm using is documented here: https://docs.soniclabs.com/sonic/build-on-sonic/getting-started

I have already tried specifying maxFeePerGas and maxPriorityFeePerGas parameters, as well as using just the gasPrice parameter, but I still encounter the same error dialog.

Reproducible code

    final contract = _createWSContract();

    final chainId = _appKitModal!.selectedChain!.chainId;
    final namespace = NamespaceUtils.getNamespaceFromChain(chainId);
    final address = _appKitModal.session!.getAddress(namespace);
    final from = address == null ? null : EthereumAddress.fromHex(address);

    final spenderParam = EthereumAddress.fromHex(_spender);

    final amountToApprove = double.tryParse(_amountController.text) ?? 0.1;
    final amountInWei = BigInt.from(amountToApprove * 1e18);

    try {
      final result = await _appKitModal.requestWriteContract(
        topic: _appKitModal.session!.topic,
        chainId: chainId,
        deployedContract: contract,
        functionName: 'approve',
        transaction: Transaction(from: from),
        parameters: [spenderParam, amountInWei],
      );
    } catch (e) {
      debugPrint("$e");
    }

[linear]

APKTN-493 requestWriteContract: envelope type "0x2" included gasPrice

[Rayhan12]

@linear

What is the bloody purpose of your LINK?????

[quetool]

Hello @myslajek! Sorry for my late response! I totally missed this issue, my apologies! I'll take a look at it right now!

@Rayhan12: Linear it's an internal tool to keep track of the issues, that's all. You can just disregard.

[Rayhan12]

@quetool
Thank you.

[quetool]

Hello @myslajek! I see no issues on my side. My code is similar to yours:

final transferValue = 0.01; //EtherAmount.fromInt(EtherUnit.finney, 11)
// we first call `decimals` function, which is a read function,
// to check how much decimal we need to use to parse the amount value
final decimals = await appKitModal.requestReadContract(
  topic: appKitModal.session!.topic,
  chainId: appKitModal.selectedChain!.chainId,
  deployedContract: deployedContract,
  functionName: 'decimals',
);

final requestValue = _formatValue(
  transferValue,
  decimals: (decimals.first as BigInt),
);
// now we call `transfer` write function with the parsed value.
final namespace = NamespaceUtils.getNamespaceFromChain(
  appKitModal.selectedChain!.chainId,
);
final senderAddress = appKitModal.session!.getAddress(namespace)!;
return await appKitModal.requestWriteContract(
  topic: appKitModal.session!.topic,
  chainId: appKitModal.selectedChain!.chainId,
  deployedContract: deployedContract,
  functionName: 'approve',
  transaction: Transaction(
    from: EthereumAddress.fromHex(senderAddress),
  ),
  parameters: [
    // should be the recipient address
    EthereumAddress.fromHex(senderAddress),
    requestValue, // == 0.23
  ],
);

[Rayhan12]

@quetool I am getting this issue
Transaction error Invalid transaction envelope type: specified type "0x2" but included a gasPrice instead of maxFeePerGas and maxPriorityFeePerGas

on appKitModal.requestWriteContract()

final function = contract.function(functionName);
final data = function.encodeCall(params);

// Get current gas prices
final gasPrice = await ethProvider.getGasPrice();
final maxPriorityFeePerGas = BigInt.from(1.5 * 1e9); // 1.5 gwei
final maxFeePerGas = gasPrice.getInWei + maxPriorityFeePerGas;

// Get nonce
final nonce = await ethProvider.getTransactionCount(
  EthereumAddress.fromHex(connectedAddress),
);

// Check balance before proceeding
final balance = await ethProvider.getBalance(EthereumAddress.fromHex(connectedAddress));
debugPrint('Account balance: ${balance.getInWei} wei (${balance.getValueInUnit(EtherUnit.ether)} ETH)');

// Estimate gas limit - UNCOMMENT AND FIX THIS
BigInt gasLimit;
try {
  final gasEstimate = await ethProvider.estimateGas(
    sender: EthereumAddress.fromHex(connectedAddress),
    to: contract.address,
    data: data,
    value: EtherAmount.inWei(value ?? BigInt.zero),
  );
  // Add 20% buffer to the estimate
  gasLimit = BigInt.from((gasEstimate.toDouble() * 1.2).round());
  debugPrint('Gas estimate: ${gasEstimate.toString()}');
  debugPrint('Gas limit with buffer: ${gasLimit.toString()}');
} catch (e) {
  debugPrint('Gas estimation failed: $e');
  // Use a reasonable default gas limit for contract calls
  gasLimit = BigInt.from(300000); // 300k gas - adjust based on your contract
}

// debugPrint('Gas estimate: ${gasEstimate.toString()}');
debugPrint('Nonce: $nonce');

final transaction = Transaction(
    from: EthereumAddress.fromHex(connectedAddress),
    to: contract.address,
    data: data,
    value: EtherAmount.inWei(value ?? BigInt.zero),
    maxFeePerGas: EtherAmount.inWei(maxFeePerGas),
    maxPriorityFeePerGas: EtherAmount.inWei(maxPriorityFeePerGas),
    maxGas: gasLimit.toInt(),
    nonce: nonce,
    gasPrice: EtherAmount.inWei(value ?? BigInt.zero));

// Use wallet connect to sign and send
final txHash = await appKitModal.requestWriteContract(
  deployedContract: contract,
  functionName: functionName,
  topic: topic.value,
  chainId: chainIdFull,
  transaction: transaction,
  parameters: params, // Make sure parameters are passed
);

[quetool]

@Rayhan12 doesn't seems to be on our side. Could you try a different wallet? https://www.reddit.com/r/Pulsechain/comments/1kq6fy4/transaction_error_invalid_transaction_envelope/

[Rayhan12]

@quetool Thank you

[LukasMys]

After testing i came to the conclusion that I'm facing this issue with Sonic blaze testnet. It's working properly with basic Sonic token. Maybe it's issue related to testnests.

[jonduttweiler]

Hello everyone,
We're encountering the same error with MetaMask on the Celo network. I've created a minimal reproducible example here:
Tx sender
The sendWriteTransaction function attempts to call approve on the USDC smart contract on Celo, but it fails right after the transaction is accepted.

[quetool]

Hello! Thanks @jonduttweiler! I'll check as soon as I can just out of curiosity and check if I can find anything worth to share with Metamask team but you all can do it as well.

[jonduttweiler]

Hello @quetool thank you for your time. Today, I tested sending some transactions again, and the error no longer appears. Unfortunately, I didn’t check the MetaMask version during my initial test, so I can’t confirm if an update resolved it. But at least from my project’s side, the issue seems to be fixed.

My environment:
reown_appkit: ^1.4.3+1