How can I view gmgmgmgmgmgmretr4eth's crypto portfolio?

You can view the full portfolio of gmgmgmgmgmgmretr4eth (0x2a39fd94e139952c3958e69172ba918d8f533571) on Zerion at https://app.zerion.io/0x2a39fd94e139952c3958e69172ba918d8f533571/overview — including token balances, DeFi positions, NFTs, and transaction history across 20+ chains.

How can I access wallet portfolio data programmatically?

Use the Zerion API at https://developers.zerion.io to query any wallet's portfolio, token positions, DeFi positions, NFTs, and transaction history programmatically.