Understanding Trading Pairs, Quote Coins, and Order Books
Demystify trading pairs like BTC/USDT, understand how the order book works, and learn to read market depth to time your entries better.
What Is a Trading Pair?
Every trade on a crypto exchange involves two assets — the base coin (what you're buying or selling) and the quote coin (what you're paying with). In BTC/USDT:
- BTC = base coin
- USDT = quote coin
The price of the pair tells you how many USDT you need to buy 1 BTC. Common quote coins on Cointivo include USDT and USDC.
How the Order Book Works
The order book is a live list of all open buy and sell orders for a trading pair, sorted by price.
- Asks (red / sell side): The lowest prices at which sellers are willing to sell. The lowest ask is the best price you can instantly buy at.
- Bids (green / buy side): The highest prices at which buyers are willing to buy. The highest bid is the best price you can instantly sell at.
- Spread: The gap between the best ask and best bid. Tight spreads mean high liquidity.
Market Depth
Below the order book you'll find the depth chart — a visual representation of cumulative order volume at each price level. Large clusters of orders create walls:
- Buy wall: Large buy orders grouped at a price — acts as support. Price may struggle to fall through it.
- Sell wall: Large sell orders grouped at a price — acts as resistance. Price may struggle to rise through it.
Be aware: walls can disappear instantly if traders cancel their orders before the price reaches them (often called "spoofing").
How Orders Match
When you place a market buy, your order matches against the lowest asks in sequence — smallest price first. If your order is large enough to consume all liquidity at one price level, it moves up to the next ask. This is called slippage — for large orders, you may pay a higher average price than the displayed last price.
A limit order adds a new entry to the order book and waits patiently until a matching order arrives.
Reading Market Imbalance
Compare total bid volume vs. ask volume in the order book. When bids heavily outweigh asks, buying pressure dominates — a short-term bullish sign. The reverse suggests selling pressure. Use this alongside price action rather than in isolation.