How can I view longeth2015eth's crypto portfolio?

You can view the full portfolio of longeth2015eth (0x7554fe0f9a0463a6952fcca916ce10b7e11dedea) on Zerion at https://app.zerion.io/0x7554fe0f9a0463a6952fcca916ce10b7e11dedea/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.