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For real-time books, use WebSockets. 
async fn fetch_orderbook(
    req: OrderbookRequest,
) -> Result<Orderbook, OpenPxError>

​
Parameters

​
market_id
string
required
Native market ID.
​
outcome
string?
"Yes" or "No" (binary markets).
​
token_id
string?
Polymarket CLOB token. Takes precedence over outcome.

​
Returns

Orderbook with bids sorted high-to-low and asks low-to-high.
​
market_id
string
​
asset_id
string
​
bids
PriceLevel[]
​
asks
PriceLevel[]
​
last_update_id
u64?
​
timestamp
DateTime?
​
hash
string?

​
Example

use openpx::OrderbookRequest;

let book = ex.fetch_orderbook(OrderbookRequest {
    market_id: "KXBTC-25MAR14-T20000".into(),
    outcome: Some("Yes".into()),
    token_id: None,
}).await?;