Payment types - x402x-docs

Comparison

Feature	EIP-3009	EIP-2612 Permit	Permit2
Support	Medium (native)	High (mainstream ERC-20)	General
Nonce	Random 32B	Contract nonce	Flexible
Typical use	USDC native	Standard ERC-20	DeFi/general

Recommendations

If natively supports EIP-3009 → choose eip3009
Standard ERC-20 → choose permit
Unsure/general purpose → let the client auto-select or use permit2

Structures reference

See:

parameters-responses/core/payment-payload
parameters-responses/core/payment-requirements