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

# Taker delay

> Marketable orders are held briefly before matching — 500ms by default, 3s on sports markets during match time.

XO holds **marketable** (taking) orders for a short window before they match. This gives resting makers time to update quotes and reduces temporal arbitrage against stale liquidity.

Resting maker orders that do not cross the book on arrival are **not** delayed.

## Delay windows

| Scope                            | Delay      |
| -------------------------------- | ---------- |
| All markets (default)            | **500 ms** |
| Sports markets during match time | **3 s**    |

Outside match time, sports markets use the default **500 ms** window.

## What gets delayed

An order is held when it would take liquidity on arrival:

| Arrival behavior                                                  | Delayed? |
| ----------------------------------------------------------------- | -------- |
| `FAK` / `FOK`                                                     | Always   |
| `GTC` / `GTD` priced through the spread (would match immediately) | Yes      |
| `GTC` / `GTD` that rests without crossing                         | No       |

Classification is by book-crossing behavior, not by time-in-force alone. A GTC that crosses the spread is delayed the same way as an FAK.

## HTTP behavior

`POST /order` and `POST /orders` **block** for the delay window plus matching. The response carries the final outcome (`matched`, `live`, or a rejection) after the hold completes — you do not poll for a mid-window status.

Budget request timeouts accordingly: at least **500 ms** on non-sports markets, and at least **3 s** when taking into sports markets that are in match time.

## Sports match-time override

When a sports event is live (match time), the orderbook raises the taker delay for that event's CLOB markets to **3 seconds**. When match time ends, those markets fall back to the default **500 ms**.