# Agent Economy OS 2047 — How an AI agent buys safely

Catalog: https://jzallxzbbdtelcpabfgr.supabase.co/functions/v1/agent-economy-catalog/buyers.json
MCP: https://jzallxzbbdtelcpabfgr.supabase.co/functions/v1/agent-economy-mcp
Free policy demo: https://jzallxzbbdtelcpabfgr.supabase.co/functions/v1/agent-economy-commerce/api/v1/demo
Free receipt demo: https://jzallxzbbdtelcpabfgr.supabase.co/functions/v1/agent-usdc-receipt-lite/api/v1/demo
Lowest-cost paid entry: GET https://jzallxzbbdtelcpabfgr.supabase.co/functions/v1/agent-usdc-receipt-lite/api/v1/receipt?tx=REAL_BASE_TRANSACTION_HASH (0.005 USDC on Base mainnet).

## Buyer procedure
1. Read OpenAPI and try free demo first. For Treasury Guardian, POST a real proposed quote to https://jzallxzbbdtelcpabfgr.supabase.co/functions/v1/agent-treasury-guardian/v1/quote-check to validate its structure without a fleet token or any USDC payment.
2. Send valid unpaid request; expect HTTP 402 with base64 PAYMENT-REQUIRED (x402 v2).
3. Validate network eip155:8453, native USDC token, exact amount and seller recipient against your trusted independent spending policy.
4. Only with owner authorization, sign using an external compatible x402 v2 wallet; send PAYMENT-SIGNATURE and the same request again.
5. Verify HTTP 200 + PAYMENT-RESPONSE and independently reconcile the Base transaction.

Neither discovery server nor this guide signs or spends funds. PayAPI funded and settled two real independent marketplace canaries totaling $0.11; these are not repeat buyers or browser checkout tests. Never send private keys to the seller.