Crypto Price Quotations
Learn how crypto pairs are quoted, how base and quote assets work, and why bid, ask, last, mark and index prices can differ across venues.
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This lesson introduces a core market concept that appears across crypto exchanges, data platforms and trading analysis.
Last reviewed: 20 August 2026
- How quotations work
- Common pairs
- Bid, ask and last
- Venue differences
- Trader relevance
- Common mistakes
- Checkpoint
- FAQ
- Summary
How the concept fits into crypto markets
What is a crypto price quotation?
A crypto quotation tells you how much of one asset is required to buy one unit of another asset. In a pair such as BTC/USD, BTC is the base asset and USD is the quote currency.
Base asset
The first asset in the pair. BTC/USD asks: what is one BTC worth?
Quote asset
The second asset. It is the unit in which the base asset's price is expressed.
Common quotation structures
| Pair | Meaning | Example interpretation |
|---|---|---|
| BTC/USD | Bitcoin priced in US dollars | BTC/USD = 90,000 means one BTC costs $90,000 |
| ETH/BTC | Ether priced in Bitcoin | ETH/BTC = 0.030 means one ETH costs 0.03 BTC |
| BTC/USDT | Bitcoin priced in Tether | Often close to BTC/USD but not mathematically identical |
| ETH/EUR | Ether priced in euros | Useful for EUR-based traders and investors |
Bid, ask and last traded price
- Bid: highest current price a buyer is willing to pay.
- Ask: lowest current price a seller is willing to accept.
- Spread: difference between bid and ask.
- Last price: price of the most recent executed trade.
Why the same cryptoasset can have different prices
Crypto trading is fragmented. BTC can trade simultaneously on many exchanges, each with its own order book, participants and liquidity.
- Different fiat or stablecoin quote assets.
- Different regional access and capital flows.
- Temporary exchange-specific imbalances.
- Fees, transfer frictions and withdrawal restrictions.
- Different derivatives index methodologies.
💡 Example
BTC/USDT on one exchange may print slightly above BTC/USD on another. Arbitrage can usually narrow large differences, but small deviations are normal.
What should a trader check before acting on a quote?
- Which exchange or venue produced the price?
- What is the quote currency: USD, EUR, USDT, USDC or another asset?
- Are you looking at bid, ask, midpoint, last trade, mark price or index price?
- How wide is the spread and how deep is the order book?
- Are conversion and trading fees material?
⚠️ Common misunderstandings
- “BTC/USD and BTC/USDT are exactly the same market.” They are related, but they use different quote assets and can trade at different prices.
- “The chart price is always my execution price.” Actual execution depends on bid, ask, spread, depth and slippage.
- “One exchange defines the global crypto price.” Crypto price discovery is fragmented across multiple venues.
✅ Quick checkpoint
- In BTC/USD, which asset is the base asset?
- Why can BTC trade at slightly different prices on two exchanges?
- What is the difference between the last price and the ask price?
Frequently Asked Questions
❓ What does BTC/USD = 90,000 mean?
It means one Bitcoin is quoted at 90,000 US dollars on that specific price source or venue.
❓ Why do some platforms use USDT rather than USD?
Many crypto venues use stablecoins as settlement and quote assets because direct banking access and fiat rails vary by jurisdiction and platform.
❓ What is a mark price?
On derivatives venues, a mark price is a reference price designed to reduce the effect of short-term order-book distortions when calculating unrealised P&L or liquidation conditions.
📋 Summary
- A crypto pair expresses the value of the base asset in units of the quote asset.
- Bid, ask, last, mark and index prices serve different purposes.
- Always identify the venue, quote asset and price type before interpreting a crypto quotation.
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