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Fading QuicklySnapshot Window: 2026-07-28 23:00 UTC · ← Back to Crypto Overview
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arxiv 2607.19545 actually stress tested x402 in the wild rather than just theorizing about it the results are worth reading if you’re building anything with agent-to-agent payments, they black-box tested 15 real facilitators covering 60k+ sellers, 360k+ buyers, about 99% of observed x402 transaction volume. found 49 distinct rule violations that collapse into 31 previously unknown vulnerabilities. every single facilitator they tested violated at least one rule, and every rule got violated by at least one platform. so what were the attack classes? free shopping (getting the resource without valid settlement), asset theft (the facilitator’s own held funds getting drained, less frequent but highest impact), service denial, and gas abuse via sponsor-paid fee amplification. coinbase and a couple others acknowledged and started fixing issues after responsible disclosure, but the paper notes other high-risk paths weren’t even fully exercised in testing