How can I view thecast91eth's crypto portfolio?

You can view the full portfolio of thecast91eth (0xb248140d89ee4a1feabdd28f2f3ef23e2bd4b469) on Zerion at https://app.zerion.io/0xb248140d89ee4a1feabdd28f2f3ef23e2bd4b469/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.