How can I view 0x1203c1b1's crypto portfolio?

You can view the full portfolio of 0x1203c1b1 (0x1203ef354cd5c228d5de2e7633ed6685ffcec1b1) on Zerion at https://app.zerion.io/0x1203ef354cd5c228d5de2e7633ed6685ffcec1b1/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.