UniswapX RFQ Auctions on Base and Arbitrum
Posted: June 13, 2026 | Effective: June 13, 2026
UniswapX, Uniswap's intent-based execution layer, now runs RFQ auctions on Base and Arbitrum. The Uniswap API will route swaps through UniswapX on these chains when it offers the better priced route. With RFQ, a quoter parameterizes each order and holds an exclusivity window to fill it before the order opens to permissionless fillers.
What changed?
RFQ is now available for Base and Arbitrum.
- Base moves from Priority auctions to DutchV3 auctions. Fillers integrated against the
PriorityOrderReactorneed to update their integration to handle DutchV3 orders. - Arbitrum moves from open Dutch auctions to RFQ. The winning quoter now holds an exclusivity window before the order becomes permissionless.
Filling remains permissionless on both chains, but only after the exclusivity window.
What do I need to do?
If you are a Uniswap API integrator
No action is required. You can keep requesting UniswapX by leaving the protocols field out of your /quote request, which is the existing default. To request UniswapX explicitly on these chains, include UNISWAPX_V3 in the protocols field.
If you are a filler
To compete for order flow during the exclusivity window, join the quoter set:
- Update your integration to handle DutchV3 orders. See Filling Dutch V3 Auctions and the reactor addresses on the deployments page.
- To verify ownership of your filler address, sign a message with the EOA wallet that has been submitting your fills, and Uniswap confirms it against onchain UniswapX activity.
If you have questions, you can reach out to the team here.