Ethereum: Error trying to send SepoliaETH between two remix accounts via smart contract with special conditions: Error reason –>undefined gas

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I can walk you through the process of creating a smart contract in Remix that maps a payment transaction between two Sepolia ETH accounts in different Metamask wallets.

Prerequisites:

  • You have Remix installed on your Ethereum blockchain.
  • You have a Sepolia ETH wallet and a Metamask wallet configured in your MetaMask.
  • You have a basic understanding of smart contract development in Remix.

Step 1: Create a new remix contract

Ethereum: Error when attempting to send SepoliaETH between two accounts in remix via smart contract with specific conditions: Cause of error -->undefined gas<br /> ” src=”https://aaradhyatextile.net/wp-content/uploads/2025/02/d881bee9.png”></p> <p>In Remix, go to <code>Settings</code> > <code>New Contract</code> (or press <code>Ctrl + Shift + N</code> on Windows/Linux or <code>Cmd + Shift + N</code> on macOS) and create a new contract. Name it something like “SepoliaPaymentMap”.</p> <p><strong>Step 2: Define the payment transaction interface</strong></p> <p>In your Remix contract, add an interface to define payment transactions. You will need to define two functions:</p> <ul> <li><code>receive</code>: This function will receive a payment transaction from Sepolia ETH and map it to a new payment transaction in another Metamask wallet.</li> </ul> <ul> <li><code>recall</code>: This function will be used to cancel the mapped payment transaction.</li> </ul> <p>Here is a code example:</p> <p><pre><code></p><p>interface PaymentTransactionInterface {</p><p>(sender, recipient, amount): [bytes4; 32]</p><p>}</p><p>structure SepoliaPaymentMapContext {</p><p>sender: address;</p><p>recipient: address;</p><p>amount: uint64;</p><p>}</p><p>pragmatic hardness ^0.8.0;</p><p>contract SepoliaPaymentMap is PaymentTransactionInterface {</p><p>mapping (address => mapping (uint64 => address)) private _mappedTransactions;</p><p>function receive(payable sender address, payable recipient address, uint64 amount) public {</p><p>// Map the payment transaction</p><p>(_mappedTransactions[sender][amount], _) = _mappedTransactions[sender].insert(recipient, amount);</p><p>}</p><p>function recall(uint64 amount) public {</p><p>// Cancel the mapped payment transaction</p><p>delete _mappedTransactions[sender][amount];</p><p>}</p><p>}</p><p></code></pre> </p> <p><strong>Step 3: Define the contract logic</strong></p> <p>In the Remix contract you will define the logic for mapping and retrieving the payment transactions. You can do this using a loop or recursion.</p> <p>Here is a code example:</p> <p><pre><code></p><p>pragmatic robustness ^0.8.0;</p><p>contract SepoliaPaymentMap {</p><p>// Define the payment transaction interface</p><p>PaymentTransactionInterface public interface;</p><p>// Initialize the storage array mappedTransactions</p><p>mapping(address => mapping(uint64 => address)) private _mappedTransactions;</p><p>// Constructor</p><p>internal function () payable {</p><p>_mappedTransactions[msg.sender][0] = msg.sender;</p><p>}</p><p>// Function to map a payment transaction</p><p>function receive(payable sender address, payable recipient address, uint64 amount) public {</p><p>// Check if there is a mapping for sender and value</p><p>require(_mappedTransactions[sender][amount] != address(0),

// Map the payment transaction

_mappedTransactions[sender][amount] = recipient;

// Set the mapped payment transaction to the storage array

interface._mappedTransactions[sender][amount] = recipient;

}

// Function to retrieve a mapped payment transaction

function recall(uint64 amount) public {

// Check if there is a mapping for sender and value

require(_mappedTransactions[sender][amount] != address(0), "Mapping does not exist");

// Cancel the mapped payment transaction

delete _mappedTransactions[sender][amount];

}

}

Step 4: Compile and deploy the contract

Compile your Remix contract with the following command:

remix -p  --interface PaymentTransactionInterface --contract SepoliaPaymentMap

Deploy your contract on the Ethereum blockchain.

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