Contract Standards

Xian uses a small set of contract interface standards for token, NFT, and payment primitives that other tools expect.

Standards

• XSC-0001: fungible token core
• XSC-0002: permit-authorizer approvals
• XSC-0003: streaming fungible token
• XSC-0004: wrapped token
• XSC-0005: non-fungible token core

Reference standards live in xian-xips. Canonical system contracts and product repositories implement the relevant interfaces where needed.

How To Use Them

• implement the core function signatures exactly
• keep event names and indexed fields stable
• prefer additive extensions over incompatible signature changes
• test compatibility with wallets, dashboards, and SDK code against the standard surface