How can I view 0xb03f01c4's crypto portfolio?

You can view the full portfolio of 0xb03f01c4 (0xb03fcaac721edbaa1df223ee298cd8aacef801c4) on Zerion at https://app.zerion.io/0xb03fcaac721edbaa1df223ee298cd8aacef801c4/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.