Your agent can pay: six attacks on x402 payments (price swap, duplicate payment IDs, free shopping, cache, look-alike sellers, prompt injection) and the fix for each
Ishween Kaur of SoFi shares six attacks she ran against an x402 buyer and seller on a test network, including one where an agent paid 50 cents for a 5-cent listing, and the guard that stopped each. The x402 specification was not checked.