What is a trading pair? How cryptocurrencies are exchanged

What is a trading pair?

A trading pair is a combination of two assets that can be traded against each other on a cryptocurrency exchange. It shows how much of one asset is needed to buy a unit of another. For example, in the BTC/USDT trading pair, Bitcoin (BTC) is traded against Tether (USDT), meaning you can buy BTC using USDT or sell BTC for USDT.

How trading pairs work

  • Base currency – The first asset in the pair (e.g., BTC in BTC/USDT).
  • Quote currency – The second asset in the pair, which determines the price (e.g., USDT in BTC/USDT).
  • Exchange rate – Represents how much of the quote currency is needed to buy one unit of the base currency.

Example

If BTC/USDT = $50,000, it means 1 BTC costs 50,000 USDT.

Types of trading pairs

  • Fiat-to-crypto pairs: Trade between a fiat currency and a cryptocurrency (e.g., BTC/USD, ETH/EUR).
  • Crypto-to-crypto pairs: Trade between two cryptocurrencies (e.g., BTC/ETH, SOL/USDT).
  • Stablecoin pairs: Crypto pairs involving stablecoins for lower volatility (e.g., BTC/USDT, ETH/DAI).

Why trading pairs matter

  • Liquidity: Popular pairs have higher trading volumes, making buying and selling easier.
  • Price discovery: Helps determine the value of a cryptocurrency against another asset.
  • Arbitrage opportunities: Traders can profit from price differences across exchanges.

FAQs

Can I trade any two cryptocurrencies directly?

Not always. Some pairs may require an intermediate trade (e.g., BTC → USDT → SOL).

What's the difference between a stablecoin and fiat trading pair?

Stablecoin pairs use crypto-backed assets like USDT or USDC, while fiat pairs involve government-issued currencies like USD or EUR.

Why do some trading pairs have lower liquidity?

Less popular pairs have fewer buyers and sellers, making trades slower and potentially more expensive.

Other Glossary Terms

DeFi

DeFi, or decentralized finance, refers to blockchain-based apps that offer financial services without banks. It runs on smart contracts, giving users full control over their assets.

Blockchain trilemma

The blockchain trilemma is the challenge of achieving scalability, security, and decentralization at the same time. Learn why it matters — and how projects try to balance the trade-offs.

Crypto Address

A crypto address is a unique identifier used for sending and receiving cryptocurrency on blockchain networks. Linked to a wallet

Public Blockchain

A public blockchain is an open, decentralized network where anyone can participate, validate transactions, and view the ledger. Learn how it works, its benefits, and the challenges it faces in scalability and security.

Circulating Supply

Circulating supply is the number of crypto tokens actively available in the market. It impacts price, market cap, and scarcity, making it a key metric for investors. Bitcoin has ~19.5M BTC circulating, while Ethereum's supply fluctuates.

Block in a blockchain

A block in a blockchain is a digital record that contains a batch of verified transactions, along with metadata such as a timestamp, cryptographic hash, and a reference to the previous block.