Bid, Ask, and Spread

Bid, Ask, and Spread

Every asset on every exchange has two prices at any given moment: the bid price and the ask price. A diferenca entre om is the spread. Understanding these three concepts is fundamental to understanding your true trading costs.

What is the Bid Price?

The bid price is the highest price that a buyer is currently willing to pay for an asset. If voce quer to sell immediately using a ordem de mercado, voce vai receive the bid price. The bid represents current demand for the asset.

Quando voce see multiple bid prices in the livro de ordens, the topmost bid (highest price) is the “best bid.” It represents o mais a buyer is willing to pay right now.

What is the Ask Price?

The ask price is the lowest price that a seller is currently willing to accept. If voce quer to buy immediately using a ordem de mercado, voce vai pay the ask price. The ask represents current supply of the asset.

The lowest ask in the livro de ordens is the “best ask.” It represents the cheapest price at which voce pode buy the asset immediately.

What is the Spread?

The spread is a diferenca entre o best ask and the best bid:

Spread = Best Ask - Best Bid

Por exemplo, if the best bid for ETH is $2,000.00 and the best ask is $2,000.50, the spread is $0.50.

The spread can also be expressed as a percentage:

Spread % = (Best Ask - Best Bid) / Best Ask x 100

In this case: ($2,000.50 - $2,000.00) / $2,000.50 x 100 = 0.025%

Why the Spread Matters

The spread e essencialmente a hidden trading cost. Every time you execute a ordem de mercado, voce esta crossing the spread. Here is why that matters:

Exemplo: ETH has a bid of $2,000 and an ask of $2,001.

• You buy ETH at the ask price: $2,001.
• You immediately want to sell at the bid price: $2,000.
• You have already lost $1 per ETH before even considering trading fees.

For high-frequency traders or bots executing many trades, the spread can significantly impact profitability.

What Affects the Spread?

Several factors influence how wide or narrow the spread is:

Liquidity: Altaly liquid assets (like BTC and ETH on major exchanges) tend to have very tight spreads, often just a few cents. Less liquid assets can have spreads of several dollars ou mais.

Volatility: During periods of high volatility, market makers widen their spreads to compensate for the increased risk. E por isso que spreads often blow up during market crashes or sudden pumps.

Trading volume: Altaer volume generally means tighter spreads because more participants are competing to offer the best prices.

Time of day: Some assets have wider spreads during off-peak hours when fewer traders are active.

Exchange: The same asset can have different spreads on different exchanges depending on each platform’s liquidity and user base.

Spread and Trading Costs

Your total cost per trade includes ambos the explicit fee and the implicit spread cost:

Total Cost = Trading Fee + Half the Spread

Why half? Because you pay half the spread when you enter (buying at the ask em vez de the mid-price) and the other half when you exit (selling at the bid em vez de the mid-price).

For a round trip (compra e venda), you pay the full spread plus fees on ambos trades.

How Grid Bots Minimize Spread Costs

Grid bots have a natural advantage when it comes to spreads. Because they use ordem limites rather than ordem de mercados, they do not cross the spread. Instead:

• Buy orders are placed on the bid side at specific nivel de grids.
• Sell orders (take-profit) are placed on the ask side at o proximo nivel de grid up.

By sitting on ambos sides of the livro de ordens and waiting for o preco to come to them, grid bots avoid paying the spread. In fact, they provide liquidity and earn the spread, que e one of the reasons grid trading can be profitable even with small price movements.

Resumo

• The bid is the highest buy price and the ask is the lowest sell price, with the spread being the gap entre om.
• The spread is a hidden trading cost that you pay toda vez que you use a ordem de mercado, making it a significant factor for frequent traders.
• Grid bots use ordem limites para evitar paying the spread and instead capture it, giving them a cost advantage over ordem de mercado strategies.

Proximo Passo

Understanding order types is crucial for effective trading: Limit vs Market Order