How can I view 0xb8309142's crypto portfolio?

You can view the full portfolio of 0xb8309142 (0xb830d2d8975da5900f4a9969d5d42958da649142) on Zerion at https://app.zerion.io/0xb830d2d8975da5900f4a9969d5d42958da649142/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.