Transaction signing through MetaMask follows a defined flow: the platform constructs the transaction object with the correct parameters for the target contract call or ETH transfer, submits the transaction to MetaMask through the eth_sendTransaction or eth_signTransaction API method, and MetaMask presents the transaction to the user for review and signing. The MetaMask signing interface shows the user the transaction's destination, value, gas estimate, and any decoded contract interaction data that MetaMask can interpret. The user confirms or rejects the transaction, and MetaMask returns either a transaction hash for confirmed submissions or an error for rejections and failures.
Error handling in MetaMask API integrations covers a range of failure modes that production traffic generates with regularity. User rejection of the signing prompt is the most common, and the integration needs to handle it gracefully without leaving the platform in a state that requires the user to refresh. Insufficient gas produces an error that the integration should surface to the user with enough context to understand what happened and how to proceed. Network congestion can cause transactions to remain pending for extended periods, and the integration needs to manage the pending state in a way that keeps the user informed without requiring manual intervention. 27 Blockchain builds comprehensive error handling into each MetaMask API integration as part of the standard scope, because the error states are predictable and the user experience consequences of handling them poorly are significant.
