Module 1: Spot trading · Lesson 2 of 14

Trading pairs and quote currencies

3 min read

A trading pair shows the price of one asset measured in another, such as BTC/USDT. The first asset is the one you buy or sell, and the second is the currency you pay with or receive.

Base and quote

In the pair ETH/USDT:

ETH is the base currency, the asset being priced.
USDT is the quote currency, the unit the price is shown in.

If ETH/USDT shows 2,500, one ETH costs 2,500 USDT. Buying the pair means spending USDT to get ETH, and selling means swapping ETH back into USDT.

Example: for example, you hold 1,000 USDT and ETH/USDT is 2,500. Spending all of it (before fees) buys 1,000 ÷ 2,500 = 0.4 ETH. If the price later moves to 2,750, that 0.4 ETH is worth 0.4 × 2,750 = 1,100 USDT, a gain of 100 USDT. If it falls to 2,250, it is worth 900 USDT.

Common quote currencies

Exchanges usually group pairs into "markets" by quote currency:

Stablecoins such as USDT and USDC, which aim to track the US dollar.
Bitcoin or ether, for pairs like SOL/BTC, where prices move with both assets.
Fiat currencies like EUR or GBP on exchanges that support them.

Stablecoin pairs are popular because profits and losses are easy to read in dollar terms, and stablecoins can move between exchanges quickly on a blockchain.

Stablecoin risks in brief

A stablecoin is a token designed to hold a steady value, usually one US dollar. It is not risk-free:

Depeg risk: the price can drift below one dollar if markets lose confidence in it.
Issuer risk: most dollar stablecoins depend on a company holding reserves. If those reserves are weak or inaccessible, the token could lose value.
Freeze risk: issuers can usually freeze tokens at specific addresses, for example on legal orders.
Regulatory risk: rules on stablecoins vary by country and can change.

Risk: treat a stablecoin balance as exposure to its issuer, not as cash in an insured account.

Key takeaways

In a pair like BTC/USDT, BTC is the base and USDT is the quote currency.
The price tells you how many units of the quote currency buy one unit of the base.
Stablecoins are convenient quote currencies but carry depeg, issuer and freeze risks.
Pairs quoted in BTC or ETH move with two volatile assets at once.

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Educational content only — not investment advice. Leveraged trading carries a high risk of loss.