Evidence: Circle press release
X followers: 700.9K (as of 2026-10-19)
Aave's governance forum post of 2026-09-16 says "Aave V4 on Arc has been successfully activated": https://governance.aave.com/t/arfc-deploy-aave-v4-on-arc/25170/9
Lending protocol named by Circle among Arc's launch DeFi apps; Aave Labs activated its V4 market on Arc on 2026-09-16.