The exam's builders tested an AI agent's x402 payment client against 19 simulated sellers on Base Sepolia test USDC; the post describes the test design but reports no agent results yet.
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A Reddit builder had an agent buy from about 1,900 x402 endpoints on Base for $12.19; 1,255 delivered, and the failures led to new pre-payment checks.
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Built this? Suggest an updateAgentropolis's builder ran a wash filter on one week of onchain x402 settlement data across 1,187 services; 130 were flagged and one stopped service still held about 15% of 30-day volume.
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Built this? Suggest an updateA builder's payment agent ran USDC payments on Arc testnet through a pre-signing riskgate, which approved one payment and blocked an unlimited approval and a look-alike recipient.
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