HAQQ, a pioneering platform in the decentralized finance (DeFi) space, introduces the 'AnteHandler' function within the Cosmos SDK to optimize gas handling, refunds, and facilitate zero-fee transactions. Let's delve into the intricacies of these features and understand how they contribute to a seamless transaction experience.
Understanding the Cosmos SDK 'AnteHandler
The 'AnteHandler' function in the Cosmos SDK serves as the gatekeeper for transaction execution, conducting essential pre-execution checks. Signature verification, transaction field validation, and the assessment of transaction fees are among the critical checks performed by this versatile handler.
Gas Consumption and Fees
Gas, a fundamental concept in blockchain networks, represents the computational work required to execute a transaction. The 'AnteHandler' in HAQQ ensures that users possess sufficient balance to cover both the transaction amount and associated fees. Additionally, it verifies that the gas limit defined in the message is greater or equal to the computed intrinsic gas for the message.
Gas Refunds in the EVM
HAQQ employs the Ethereum Virtual Machine (EVM), allowing users to specify gas before execution. The 'AnteHandler' consumes the specified gas at the transaction's outset, with any leftover gas refunded to the user after execution. Furthermore, the EVM can define gas refunds, although these are capped based on the fork/version in use.
Zero Fee Transactions in Cosmos and HAQQ
Unlike some blockchain networks, Cosmos and HAQQ do not enforce a minimum gas price through the 'AnteHandler.' Instead, the 'min-gas-prices' are checked against the local node/validator. This flexibility enables validators to specify varying minimum values for fees, allowing users to potentially submit zero-fee transactions if at least one validator is willing to include such transactions in their proposed blocks.