How can I view 0x4dfeffe2's crypto portfolio?

You can view the full portfolio of 0x4dfeffe2 (0x4dfe0051fbc105e03df040a3443c3dddb745ffe2) on Zerion at https://app.zerion.io/0x4dfe0051fbc105e03df040a3443c3dddb745ffe2/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.