> ## Documentation Index
> Fetch the complete documentation index at: https://docs.codex.io/llms.txt
> Use this file to discover all available pages before exploring further.

# PredictionOutcomeOrderBook

> A live order book snapshot for a single prediction outcome, sourced from the venue's CLOB. Polymarket and Kalshi; outcomes from other venues return no book. Cached for up to 10s.

## GraphQL

```
type PredictionOutcomeOrderBook {
  outcomeId: String!
  protocol: PredictionProtocol!
  venueOutcomeId: String!
  bids: [PredictionOrderBookLevel!]!
  asks: [PredictionOrderBookLevel!]!
  timestamp: Int!
  bookLiquidityUsd: String
  bookLiquidityCT: String
}

enum PredictionProtocol {
  POLYMARKET
  KALSHI
}

type PredictionOrderBookLevel {
  price: Float!
  size: Float!
}
```

### Used By

**Returned by**

* [predictionOutcomeOrderBooks](https://docs.codex.io/api-reference/queries/predictionoutcomeorderbooks.md): Returns live order books for a set of prediction outcomes, fetched from the venue's CLOB. Polymarket and Kalshi; outcomes from other venues will return null. Cached for up to 10s.


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