> For the complete documentation index, see [llms.txt](https://docs.optimex.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.optimex.com/optimex-revolutionizing-bitcoin-finance/optimex-swap/user-guide/confirm-and-sign.md).
# Confirm and Sign
Once you have confirmed all the swap details on the Optimex platform UI, the final steps are to authenticate the swap and sign-off the transfer on your Web3 wallet:
* Authenticate Swap request: Your connected base wallet UI will prompt you with a signature request. This signature is to authenticate the swap with specific swap details you saw earlier in the previous screen. No fund nor asset is moved with this signature.
* Token approval (applicable for ERC-20 token): If your base asset is an ERC-20 token (e.g., USDC, USDT or WBTC on Ethereum), your base wallet UI may prompt you to grant approval. This is a common practice for DeFi platforms dealing with ERC-20 tokens.
* Confirm swap: Finally, the base wallet UI will request your signature to transfer the indicated amount of base asset to Optimex Vault associated with the Swap. This transfer officially puts the Swap in progress. The next parts are on Optimex’s Solver and PMM to handle.
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