Retrieving Storage Address

To access particular pair's interface, you first need to know its' contract address

You can use a view function in the Feeder contract to retrieve the current storage contract address for a particular pair:

cast call $PROXY_ADDRESS 'getPairStorageAddress(string) returns (address)' $PAIR_NAME --rpc-url=$RPC_URL

If you have your Alchemy key stored in $ALCHEMY_KEY variable then you can use the following command to get the address of the ETHUSDC storage on Arbitrum:

cast call 0xebAfeEB70704423190B1183C017D0eB8Ab2ea80A 'getPairStorageAddress(string) returns (address)' ETHUSDC --rpc-url=https://arb-mainnet.g.alchemy.com/v2/$ALCHEMY_KEY

Now you can visit the Storage Contract methods page and check out the storage interface.