Unless otherwise specified, a network can be provided either as a network name (ethereum) or a network id (42161 for Arbitrum for example).

https://services.blockpour.com/api/prices/average/token/DAI?interval=1h&network=ethereum
https://services.blockpour.com/api/prices/average/token/DAI?interval=1h&network=1

Some endpoints accept a list of networks. In this case, unless otherwise specified, the endpoint will return data corresponding to all endpoints if no network is provided. Here again, networks can be either network names or network ids.

https://services.blockpour.com/api/swaps/recent
https://services.blockpour.com/api/swaps/recent?network=ethereum,optimism
https://services.blockpour.com/api/swaps/recent?network=1,10