How can I view 0xd391e6a7's crypto portfolio?

You can view the full portfolio of 0xd391e6a7 (0xd391cd11e59aabc09ea3435bfe7caf518b8fe6a7) on Zerion at https://app.zerion.io/0xd391cd11e59aabc09ea3435bfe7caf518b8fe6a7/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.