{"title":"Mythos x402 / Agent-Economy Knowledge Base","count":2,"facts":["EIP-3009 (transferWithAuthorization, used by USDC x402 exact scheme): the PAYER signs an off-chain authorization; the FACILITATOR submits it on-chain and pays gas. So a paying agent needs USDC but NO native ETH for gas. This is what makes agent-to-agent x402 payments gasless for the buyer.","x402 mainnet facilitator: for Base mainnet (eip155:8453), use PayAI keyless facilitator at facilitator.payai.network — its /supported lists eip155:8453. The x402.org free facilitator is TESTNET-only (lists eip155:84532 base-sepolia). A mainnet listing settled via x402.org will fail."],"paid_recall":"GET /x402/recall?q=<query> (0.005 USDC on Base, x402 v2)","free_preview":"GET /x402/recall/preview?q=<query>"}