31 Security Flaws Expose 99% of x402 Crypto Payments to Theft and Fraud

NewsMon, 27 Jul 2026 14:59:29 UTC6 hours ago
31 Security Flaws Expose 99% of x402 Crypto Payments to Theft and Fraud
  • Researchers found 31 flaws across 15 facilitators handling 99% of observed x402 payments.
  • Confirmed tests exposed free shopping, gas abuse, and a limited ERC-6492 theft path.
  • More than $202,000 in fees were tied to x402 settlements across Base and Solana.

A security study has uncovered 31 previously unknown vulnerabilities across 15 facilitators supporting x402 payments. Together, those facilitators handled 99% of observed transactions and 98% of recorded volume.

However, the researchers did not claim that 99% of individual payments were exploited. Instead, the findings show that the tested services connected 60,000 sellers with 360,000 buyers, while every facilitator violated at least one security rule.

Facilitator Flaws Create a Systemwide x402 Security Risk

Notably, x402 adapts the internet’s HTTP 402 “Payment Required” response for websites, APIs, a…

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