0x5c2ed810328349100A66B82b78a1791B101C9D61
Aave Matic Market WBTC isn't on the curated arena yet, but anyone can pick it as one of their five each round.
https://ape.talkabout.today/t/0x5c2ed810328349100A66B82b78a1791B101C9D61