Router & Adapters
Last updated
Last updated
In order to eliminate the necessity for an approval transaction and to apply a service fee to our orders, we've implemented a system comprising a central Router contract, in conjunction with adapters tailored to each of our partner swap protocols.
For Smart Ramp orders requiring a swap, after the optimal route for the swap and corresponding calldata is computed off-chain, the swap transaction goes as follow, through the execution of Router's ftatSwapWithPermit function :
Calldata intended for the swap protocol contract is passed to our Router contract along with a signed permit. This permit grants Router permission to spend input tokens for the swap.
Subsequently, the permit undergoes validation, and the approval is executed.
Router transfers the requisite tokens from user's wallet to the relevant adapter. The calldata is also transmitted alongside, trough a call to adapter's callAction function.
In turn, the adapter engages directly with the swap protocol through the provided calldata, using Solidity's call function.
If execution is successful, Router emits a Swap event.
