# order book

All accounts, users, and modules interact with a single shared orderbook, which is contained in the bookkeeper. This allows new markets to trivially access existing supply liquidity.

New [orders](https://docs.pharosprotocol.com/bookkeeper/order) for existing capital in accounts can be created at no gas cost by signing the order with a wallet. Signed orders are held off-chain and securely verified on-chain using [EIP-712](https://eips.ethereum.org/EIPS/eip-712) standard signing and verification.