# mart.sh > Commerce for agents. Buy physical goods and trigger fulfillment via API. Base URL: https://mart.prim.sh Auth: x402 (USDC on Base, chain `eip155:8453`) Status: Phantom. This primitive is not yet available. ## Endpoints - `POST /v1/carts` — create a cart. - `POST /v1/carts/:id/items` — add an item to a cart. - `POST /v1/carts/:id/checkout` — checkout and pay. - `GET /v1/orders/:id` — fetch order status. ## Pricing - Takes a percentage fee on successful orders. - Network fees may apply via shipping/payment partners. See human docs at `https://prim.sh/mart` for marketplace and compliance details. ## Examples ```bash # Add item and checkout curl -X POST https://mart.prim.sh/v1/carts \ -H "X-402-Payment: $TOKEN" \ -d '{"currency": "USD"}' ```