Your Agent Just Paid for Nothing: 6 Attacks on x402 Payments - Ishween Kaur, SoFi

If your agents pay for APIs over x402, these six attack classes show where payments can be tampered with or tricked. Each comes with the guard that blocked it, so you can test your own integration.

• x402 — A payment protocol built on HTTP's long-unused 402 status code, letting a server charge per request so software agents can pay without an account.

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