#RC#
A transaction revert is usually a signal that the contract requirements were not fully met. A common issue with web3.js involves a mismatch between the wallet and the selected chain. To handle the conflict related to 402, try reducing the number of tokens in the transaction. The sudden error message marked as 402 could be due to a recent change in the API endpoint.
To optimize your web3.js experience, use a dedicated RPC node for faster confirmations. Most minor errors are fixed automatically once the network congestion subsides. It is worth checking if the contract has a “paused” state related to 402 in its code. Using a sandbox environment can help you test transactions avoiding the 402 error.
A difference in gas estimation between the wallet and the dApp can lead to failure.