How can I view bookingserviceeth's crypto portfolio?

You can view the full portfolio of bookingserviceeth (0x18c9a4a2c61bbda0cbbd47b6534b2fe46b57b0d4) on Zerion at https://app.zerion.io/0x18c9a4a2c61bbda0cbbd47b6534b2fe46b57b0d4/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.