GasSwap: Paying ETH to Smart Contracts without Passing ETH by Sorawit Suriyakarn

One of the hassles when it comes to developing smart contracts and try to make them interoperable is how to pass ETH around. If one contract in a dependency requires a payment in ETH, every contract in the call-chain between the payer (either the transaction originator or a smart contract) and the receiver must pass along the ETH. This makes developer experience and contract interface design unnecessarily hard. At Band Protocol, we plan to release GasSwap, an on-chain simple library that allows a contract to directly get ETH from transaction sender via Gas. By combining [Uniswap](https://uniswap.io), a decentralized on-chain liquidity pool, and [GasToken](https://gastoken.io), a trustless Gas-ETH token conversion system, a contract can mint Gas token, at the cost of tx originator and use Uniswap to trade for ETH, simplifying the process.
With GasSwap there are three benefits:
1. No need to decorate `payable` everywhere. Contracts can just mint ETH with GasSwap. It can also work with other tokens too.
2. User does not necessarily feel like they are paying for anything; it's just a seamless, more expensive gas cost experience.
3. ETH gas price will be more stable as there will be a liquid place to hedge/bet against gas price movement.
While it's true that Ethereum community is trying to move away from the current storage model, making GasToken's life harder. We believe GasSwap is a breakthrough in smart contract design that's worth exploring.

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