Understanding the Gap Between Buy and Sell Rates
Explains the buy/sell spread with a clearly labelled example and why cross-platform price gaps are not guaranteed profit.
Buy and sell rates are normally different. The difference is often called the spread, but the exact way a platform presents prices depends on its business model and the market it uses. Understanding the gap helps a visitor avoid treating two separate quotes as a guaranteed opportunity.
Calculate the displayed gap
If a hypothetical service displays a buy price of ₦1,510 and a sell price of ₦1,480 per USDT, the displayed difference is ₦30 per USDT. Relative to the buy price, that is about 1.99% (₦30 ÷ ₦1,510 × 100). These are illustrative numbers only, not current market data.
Why a gap exists
Buyers and sellers may be using different offers, order limits, payment methods or liquidity pools. A platform may also include its operating margin in the quote. Fees can be separate from the spread, so the displayed gap does not necessarily equal the full cost of a transaction.
Why it is not automatically arbitrage
Comparing the lowest buy quote from one source with the highest sell quote from another does not prove that a user can buy and sell immediately at those prices. The offers may be unavailable for the same amount, may use incompatible payment routes, or may change before the second leg of a transaction. Fees and settlement delays can eliminate an apparent difference.
Use consistent inputs
- Use the same asset and fiat currency.
- Keep buy and sell directions correctly labelled.
- Compare the same order size where possible.
- Include known fees and payment costs.
- Check timestamps and confirm both quotes at their sources.
How a comparison site should explain it
Show the two prices with clear labels, identify their sources and disclose missing information. Avoid claims such as “guaranteed profit” or “risk-free spread.” A transparent comparison explains what is known and where the user must verify the remaining details.