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usdc-integration

Use when integrating USDC into smart contracts, handling stablecoin transfers, approvals, or checking balances. Covers the 6-decimal rule, production contract addresses on all major chains, native vs bridged USDC variants, FiatTokenV2_2 proxy architecture, permit (EIP-2612), blocklist behavior, and safe integration patterns.

skills/usdc-integration/SKILL.md

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Oct 23, 2026
License
MIT

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# USDC Integration for Smart Contracts

## The 6-Decimal Rule

USDC uses 6 decimals on every chain. Not 18. This is the single most common integration bug.

```solidity
// 1 USDC = 1_000_000 (1e6)
uint256 constant USDC_UNIT = 1e6;

// $100 USDC
uint256 amount = 100 * 1e6; // 100_000_000

// $0.01 USDC (one cent)