How can I view 0x21b7d2fc's crypto portfolio?

You can view the full portfolio of 0x21b7d2fc (0x21b77911e9df7b469b173a577da61a20360cd2fc) on Zerion at https://app.zerion.io/0x21b77911e9df7b469b173a577da61a20360cd2fc/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.