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Shou-Ling Ji

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Preprint Jul 2026

When HTTP 402 Meets the Blockchain: Risks on Emerging x402 Payments

x402 is an emerging payment protocol for Web APIs and autonomous AI agents. x402 extends HTTP 402 with a payment negotiation flow and delegates payment proof verification and on-chain settlement to third-party facilitators. As a result, facilitators serve as a shared payment infrastructure for many independent merchant...

Qinying Wang, Yong Yang, Yuan Chen et al. · 2 citations · ⚡1

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