{"resource":{"name":"Create a temporary Callback endpoint","description":"Create a temporary public webhook endpoint with authenticated event retrieval and long polling.","url":"https://api.exende.dev/v1/callbacks","method":"POST","payment":{"protocol":"x402","price":"$0.01 USDC","network":"eip155:8453"}},"usage":"Send a POST request to this URL. The response to an unpaid request contains the x402 payment requirement."}