Free x402 Quote Inspector Lets Agents' Payment Terms Be Checked Before Signing

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A newly released free tool called the x402 Quote Inspector decodes HTTP 402 payment-required responses into plain fields such as amount, asset, network, and recipient. The tool is designed to let a person or agent verify the quote against the intended purchase before any wallet signs, and it neither pays nor requests a wallet connection. Its developers also published 20 synthetic test fixtures covering malformed and adversarial quote shapes, which they say demonstrate behavior on constructed inputs rather than live payment records. The article notes that the inspector only checks whether a quote matches expectations, not whether a price is fair. The authors also report one ChatGPT citation of their evidence and a site audit that restored 155 previously missing pages to discovery indexes.

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