Only 41% of Paid x402 API Calls Settled in Real-Money Protocol Audit

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A project called vet402 made 1,596 real USDC payments to 1,005 distinct x402 HTTP payment-protocol endpoints to measure what actually happens after money is sent. Only 653 of those attempts — about 41% — reached confirmed settlement with a verifiable receipt. The audit also found that of 19,023 total listed endpoints in the catalog, only 1,246 have been independently verified, while 17,777 remain unverified claims. An additional 3,772 endpoints have already been delisted, pointing to significant churn invisible to outside observers. The project, released under an MIT license, publishes all results including failures, and warns developers building payment agents not to treat a successful payment as proof that anything was actually delivered.

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