PaySafe tool claims to block AI agent wallet drains via x402 payment firewall

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A developer behind a tool called PaySafe has published a tutorial explaining how autonomous AI agents using the x402 payment protocol can be protected from prompt-injection attacks that trick them into sending funds to malicious wallet addresses. The threat involves hidden instructions embedded in web content that an agent reads, causing it to redirect payments without any human review. PaySafe acts as a payment firewall, intercepting outgoing transactions and checking for risks such as address injection, overpayment, nonce replay, and leaked credentials in payment metadata. The client libraries, available for TypeScript and Python, add a single verification call before settlement and return a cryptographically signed verdict in under a millisecond. The service is described as non-custodial, with the first 100 scans free and no account registration required.

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