As of 2026, USDC is the default stablecoin on multiple networks in x402's reference SDKs.

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Location PART 2 - FOUR HIDDEN CHIMNEYS CHAPTER 10: BUILDING-BLOCK REALITY Catching the Spotlight

"As of 2026, USDC is the default stablecoin on multiple networks in x402’s reference SDKs."

The current x402 Python SDK changelog identifies USDC as the default stablecoin on numerous supported networks including Ethereum, Avalanche, Sei, Celo, Polygon, Arbitrum and others.

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Source title x402/python/x402/CHANGELOG.md at main · x402-foundation/x402 · GitHub

Source authors x402 Foundation

Source year 2026

Confidence high

Importance mid