TLDR Tech / Crypto
x402 Adds Universal ERC-20 Token Support
The x402 payment protocol has extended beyond its original EIP-3009 foundation to support virtually any ERC-20 token, integrating Uniswap's Permit2 alongside two new gas sponsorship extensions that handle transaction fees in the background. EIP-2612 Gas Sponsorship covers tokens with native permit functionality, while ERC-20 Approval Gas Sponsorship handles standard tokens such as USDT, allowing facilitators to abstract gas costs from end users across both paths. The CDP facilitator already supports these extensions on Base and Polygon, making the upgrade immediately usable rather than theoretical.
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