Before you buy ETH on Binance.us through the Advanced Trading screen, you pick a trading pair, and that choice shapes everything else on the screen.
The pair tells you what you are buying, what you are paying with, which price you are looking at and which order book your order meets. Reading it correctly takes a few seconds and prevents the most common order-entry mistakes.
Note. Pair availability changes. Binance.us adds and removes markets over time, so treat the live pair list as the source of truth rather than any list in an article, including this one.
Base and Quote Assets When You Buy ETH on Binance.us
In a pair written as ETH/USDT, ETH is the base asset and USDT is the quote asset. The price answers one question, namely how many units of the quote asset one ETH costs.
That matters because your spending balance and the order total show in the quote asset. If you hold USD but open an ETH/USDT market, the order form has no USDT balance to spend.
Good to know. In states where Binance.us runs as a crypto-only exchange, trading happens on USDT, BTC and ETH pairs, so the quote asset you hold decides which ETH market you can use.
What Each Part of the Screen Tells You
| Screen element | What it shows | Question to ask |
|---|---|---|
| Pair symbol | Base asset and quote asset | What am I buying, and what am I spending? |
| Last price | The most recent traded price | Is this the price I will actually get? |
| Bid and ask | The best waiting buyer and seller | How wide is the spread? |
| Order book | Waiting orders at each price level | Could my order fill across several levels? |
| Order type | How your instruction will execute | Do I want speed or price control? |
| Amount and total | ETH quantity and quote-asset spend | Do the units match what I intended? |
The Last Price Is Not Your Fill Price
The large number at the top of the screen is usually the last traded price. A market order does not promise that number. It fills against the orders waiting in the book, so your average price can differ from the one you saw a moment earlier.
Binance.us defines slippage as the difference between the expected price of a trade and the price at which it actually executes. In a calm, liquid market the gap is usually tiny, while fast moves and larger orders widen it.
Reading the Order Book and Spread
The order book lists standing buy and sell orders at different prices. The highest bid is the best current offer to buy, the lowest ask is the cheapest current offer to sell, and the gap between them is the spread.
A narrow spread means buyers and sellers are meeting close together. A wide one means the next available seller sits noticeably above the best buyer. The book also gives a rough sense of depth, meaning how much ETH is available near the current price.
Example. If you place a market buy larger than the amount offered at the best ask, the rest of the order fills against higher asks. Your average price then ends up above the first price you saw.
Market, Limit and Stop-Limit Orders on the Pair
Binance.us describes the three basic order types this way:
- Market order. Buys immediately at the current market price.
- Limit order. Buys only at the price you set or better, and may never fill if the market does not reach it.
- Stop-limit order. Places a limit order once the market reaches a stop price you choose.
For a simple purchase, the key decision is whether you care more about filling now or about capping the price you pay. Binance.us suggests limit orders when you want to reduce exposure to price impact and slippage.
Reading the Order Ticket Before You Submit
The order ticket is where most avoidable mistakes happen. Read each field by its unit, not just by its label.
| Field | What it means | Check before buying |
|---|---|---|
| Price | For a limit order, the quote-asset price you will pay per ETH. A market order uses available prices instead. | Is this the price I intended? |
| Amount | Usually the ETH quantity. Some market orders let you enter the quote amount to spend instead. | Is the unit ETH or the quote asset? |
| Total | The approximate cost in the quote asset, before final fills and fees | Does it match my budget? |
Tip. Read the pair and the total once more in the confirmation window. Buying on the wrong pair, or ten times the amount you meant, is easy to prevent and awkward to unwind.
Why ETH/USD and ETH/USDT Are Different Markets
Two ETH pairs can show almost the same price and still be different markets. USD is fiat currency, while USDT is a crypto asset designed to track the dollar. Each pair spends a different balance and has its own order book.
Liquidity can also differ between them. One ETH market may have a tighter spread or a deeper book than another at any given moment, so check the spread and depth on the pair you will actually use, not only the headline ETH price.
A Pre-Buy Check of the ETH Screen
- Confirm the pair starts with ETH.
- Confirm the quote asset is the balance you intend to spend.
- Look at the bid and ask, not only the last price.
- For a larger order, scan the depth of the order book.
- Choose market or limit on purpose.
- Check the price, the ETH amount and the total on the ticket.
- Read the confirmation window before submitting.
This short routine covers the fields that actually change what you pay for your ETH.
Questions About Reading ETH Pairs on Binance.us
What does ETH/USD mean?
ETH is the base asset and USD is the quote asset. The price shows how many US dollars one ETH costs in that market.
Why can’t I spend my USD balance on an ETH/USDT pair?
That pair is priced and paid in USDT. To spend USD, open an ETH pair quoted in USD, or convert your USD to USDT first.
What happens to a limit buy that never fills?
It stays on the order book as an open order until the market reaches your price or you cancel it. Check your open orders before placing a second one for the same purpose.
Can the available ETH pairs change?
Yes. Exchanges add, suspend and remove markets, so check the live pair selector on Binance.us before you plan a purchase around a specific pair.