You may see a “Your swap couldn't be filled at this time. Try again or learn more” error message while using UniswapX.
A UniswapX swap might not be filled for the following reasons:
- An error occurred while submitting the swap to the open network of third party fillers
- An error occurred while signing the submission
- A token approval may need to be revoked and approved again
There are no network costs charged when an unfilled or failed swap, so the swap can be submitted again.