Ishween Kaur explains how x402 lets an agent respond to an HTTP payment request and describes experiments run in a test environment. She shows how an altered payment requirement can charge more than a listed price and recommends checking the seller, wallet, network and amount before signing.
Kaur demonstrates how duplicate payment identifiersIdempotency is the property that repeating an operation has the same intended effect as performing it once., retries and releasing data before settlement can produce losses. She discusses shared tracking, binding claims to the requested resource and choosing whether to wait for settlement based on latency and risk.
A lookalike seller and a response that induces an agent to buy a second summary illustrate risks in discovery and prompt injectionPrompt injection occurs when untrusted content attempts to redirect an AI system's behaviour beyond the authority of that content.. Kaur proposes seller review and constrained execution plans, while acknowledging the limits of keyword filters and model-based detection.
For deployment, Kaur recommends tracing a paymentAn execution trace records the sequence of operations and results produced while a system carries out a task. through the workflow, testing successful and failed cases, and using those results to decide where alerts or blockingSecurity monitoring collects and analyzes system activity to detect suspicious behavior, control failures and emerging threats. are appropriate.
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