What is a ticker ?

A ticker, synonym for a stock symbol, is the short form of full security (asset) name. A ticker has a stream of quotes (AKA prices) attached to it, continuously updated throughout a trading session by the various exchanges. 
For example, take ETH-BTC , if you have curl and jq installed, you can get a ticker from Kucoin with this command 
curl -s https://api.kucoin.com/api/v1/market/orderbook/level1?symbol=ETH-BTC \
| jq .data
The result will look like this : 
{
  "time": 1597187421265,
  "sequence": "1594340550066",
  "price": "0.033131",
  "size": "0.0013217",
  "bestBid": "0.03313",
  "bestBidSize": "2.1812529",
  "bestAsk": "0.033131",
  "bestAskSize": "2.8001025"
}
The first listed currency of a currency pair is called the base currency (ETH), and the second currency is called the quote currency. Price at 0.033131 means 1 Ether can be bought with 0.033131 Bitcoin.
These are the fields you can find on a ticker quote:
Field
Description
currencyPair
Currency pair
open
The opening price is the first trade price that was recorded during the day’s trading.
last
Last trade field is the price at which the last trade was executed.
bid
The bid price shown represents the highest price.
ask
The ask price shown represents the lowest price.
high
The day’s high price.
low
The day’s low price.
vwap
Volume-weighted average price (VWAP) is the ratio of the value traded to total volume traded over a particular time horizon (usually one day).
volume
Volume is the number of shares or contracts traded.
quoteVolume
Quote volume
bidSize
The bid size represents the quantity of a security that investors are willing to purchase at a specified bid price.
askSize
The ask size represents the quantity of a security that investors are willing to sell at a specified selling price.
timestamp
The moment at which the account information was retrieved.

What is an account ?

What is an order ?

Last updated 2 months ago

Field	Description
`currencyPair`	Currency pair
`open`	The opening price is the first trade price that was recorded during the day’s trading.
`last`	Last trade field is the price at which the last trade was executed.
`bid`	The bid price shown represents the highest price.
`ask`	The ask price shown represents the lowest price.
`high`	The day’s high price.
`low`	The day’s low price.
`vwap`	Volume-weighted average price (VWAP) is the ratio of the value traded to total volume traded over a particular time horizon (usually one day).
`volume`	Volume is the number of shares or contracts traded.
`quoteVolume`	Quote volume
`bidSize`	The bid size represents the quantity of a security that investors are willing to purchase at a specified bid price.
`askSize`	The ask size represents the quantity of a security that investors are willing to sell at a specified selling price.
`timestamp`	The moment at which the account information was retrieved.