How can I view bitcoinyydseth's crypto portfolio?

You can view the full portfolio of bitcoinyydseth (0xc43e3fb4b66274af1cb583ff0dded4b1a3b4049b) on Zerion at https://app.zerion.io/0xc43e3fb4b66274af1cb583ff0dded4b1a3b4049b/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.