1. How to Track the Open Event

When a Book is created, an Open event is emitted, similar to the PairCreated event in the Uniswap V2 factory.

/**
 * @notice Event emitted when a new book is opened
 * @param id The book id
 * @param base The base currency
 * @param quote The quote currency
 * @param unitSize The unit size of the book
 * @param makerPolicy The maker fee policy
 * @param takerPolicy The taker fee policy
 * @param hooks The hooks contract
 */
#[derive(Drop, starknet::Event)]
pub struct Open {
    #[key]
    pub id: felt252,
    #[key]
    pub base: ContractAddress,
    #[key]
    pub quote: ContractAddress,
    pub unit_size: u64,
    pub maker_policy: FeePolicy,
    pub taker_policy: FeePolicy,
    pub hooks: ContractAddress,
}

In Clober, the hook ID is typically set to a zero byte, meaning no hooks are used.

Note: There is no on-chain method to directly retrieve the list of created book IDs. Instead, you can use the Subgraph to query the currently created books and their properties.