> For the complete documentation index, see [llms.txt](https://centaurlabs-erc.gitbook.io/centaurlabs-erc/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://centaurlabs-erc.gitbook.io/centaurlabs-erc/centaurlabs-or-gasless-swap/gasless-swap-workflow.md).

# Gasless Swap Workflow

The gasless swap workflow in CentaurLabs involves three primary stages:

#### User Initiated Swap

1. **User Request:** A user initiates a swap request through their wallet, specifying the tokens to be exchanged and the desired exchange rate.
2. **Order Creation:** The wallet communicates with CentaurLabs smart contracts, creating an order on the order book.

#### Relayer Matching

3. **Order Matching:** Relayers continuously monitor the order book for new orders. When a matching order is found, the relayer submits a transaction to execute the swap.
4. **Gas Fee Coverage:** Relayers pay the transaction fees in ETH, ensuring users do not need to hold ETH for swaps.

#### Smart Contract Execution

5. **Trade Execution:** The SwapExecution contract verifies the swap and executes token transfers, ensuring both parties receive their desired tokens.
6. **Transaction Confirmation:** Transaction details and swap confirmation are provided to the user's wallet.