How can I view mengmengxiaoyoueth's crypto portfolio?

You can view the full portfolio of mengmengxiaoyoueth (0x28f9585c8e98bbb51ed2d6fe72ea4d0b09c040bb) on Zerion at https://app.zerion.io/0x28f9585c8e98bbb51ed2d6fe72ea4d0b09c040bb/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.