How can I view 28031990eth's crypto portfolio?

You can view the full portfolio of 28031990eth (0x20bd3ae9171cf20436a8a7e8027c74bcc7e2dbc4) on Zerion at https://app.zerion.io/0x20bd3ae9171cf20436a8a7e8027c74bcc7e2dbc4/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.