How can I view 0x3b91e9f8's crypto portfolio?

You can view the full portfolio of 0x3b91e9f8 (0x3b91e580273107ceaf9be6f698169d1e9df3e9f8) on Zerion at https://app.zerion.io/0x3b91e580273107ceaf9be6f698169d1e9df3e9f8/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.