ritmex-bot/docs/binance/binance-spot/websocket-api_data-sources.md

title, source, fetched_at

title	source	fetched_at
Data sources | Binance Open Platform	https://developers.binance.com/docs/binance-spot-api-docs/websocket-api/data-sources	2026-02-26T10:38:12.732Z

• The API system is asynchronous. Some delay in the response is normal and expected.

• Each method has a data source indicating where the data is coming from, and thus how up-to-date it is.

Data Source

Latency

Description

Matching Engine

lowest

The Matching Engine produces the response directly

Memory

low

Data is fetched from API server's local or external memory cache

Database

moderate

Data is retrieved from the database

• Some methods have more than one data source (e.g., Memory => Database).

  This means that the API will look for the latest data in that order: first in the cache, then in the database.