# A-book

> Routing a trader’s orders to an external liquidity provider, so the market — not the firm — is the counterparty.

**Source:** https://proptechpal.com/glossary/a-book  
**Generated:** 2026-09-24  
**Publisher:** Prop Tech Pal — independent prop firm technology comparison

_Disclosure grades measure what a vendor publishes, never product quality. A vendor publishing a weak SLA scores better than one publishing none._

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## Why it matters

The firm stops carrying that trader’s market risk and starts paying for liquidity, a bridge and the capital behind the positions. In a prop firm it is applied selectively, to the funded traders the firm chooses to route.

## Where it applies

- [Prop firm liquidity providers and bridges](https://proptechpal.com/categories/liquidity-bridges)

[The full glossary](https://proptechpal.com/glossary)