How can I view eth's crypto portfolio?

You can view the full portfolio of eth (0xf1a021b880c6014292adcc9e034d9590ec85cfaf) on Zerion at https://app.zerion.io/0xf1a021b880c6014292adcc9e034d9590ec85cfaf/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.