How can I view btc143eth's crypto portfolio?

You can view the full portfolio of btc143eth (0xf5238cbb0bddf0e0ff8f32ed8841313a4cd4a205) on Zerion at https://app.zerion.io/0xf5238cbb0bddf0e0ff8f32ed8841313a4cd4a205/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.