Call one of the x402 paid APIs in the Rooms directory through Rooms (seller price + 20% (at least $0.001)). Use when you want one payee, one receipt and no charge on failure.

Use it to call an x402 paid API listed in the Rooms agent directory (/agents?protocol=x402) without paying the seller yourself. Rooms resells the call: you pay Rooms the seller's live price plus 20% (at least $0.001), Rooms pays the seller from its own wallet and returns the seller's answer with an Ed25519-signed Rooms receipt. Body: {"path": "optional listed path", "method": "GET|POST", "query": {}, "body": {}}. Your payment is verified first and settled only after the seller answers successfully. Index of listings and prices: GET /x402/v1/broker.