If you wish to cancel your limit order, you must head to the ‘Active Orders’ section to see your current Limit Orders. Afterward, you can select to cancel one or all of your open limit orders.
Limit Orders can also be canceled using the corresponding chain explorer, interacting directly with the Augustus RFQ smart contract. To do so, please follow these steps:
Get your OrderHash from the following API endpoint:
https://api.paraswap.io/ft/orders/[input CHAIN ID]/maker/[input your address]
Tip: you can get the Chain ID from ChainList.org
Head to the corresponding Augustus RFQ contract explorer, which you can get from the ParaSwap Developers Doc
Go to the Contract -> Write Contract Tab and connect your Wallet to the Chain Explorer.
Use the Method Cancel Order and input the OrderHash of the Limit Order you wish to cancel.
Click the Write button, sign, and submit the transaction on-chain.
Please note that canceling a limit order implies submitting an on-chain transaction which incurs in paying gas transaction fees.