Open the XRPL DEX in your Gopnik wallet right now. You'll see something that looks like this:
ASK $0.5520 8,200 XRP (someone willing to sell 8,200 at $0.5520)
ASK $0.5515 14,000 XRP
ASK $0.5510 3,000 XRP ← cheapest seller
───────────── spread = $0.0010
BID $0.5500 6,000 XRP ← highest buyer
BID $0.5495 9,500 XRP
BID $0.5480 21,000 XRP
Three things to read here.
The bid
The bid is the highest price someone is willing to pay to buy XRP right now. If you want to sell immediately, this is roughly what you'll get (minus fees). In the example above: $0.5500.
The ask
The ask is the lowest price someone is willing to accept to sell XRP right now. If you want to buy immediately, this is roughly what you'll pay. In the example: $0.5510.
The spread
The spread is the gap between them: $0.5510 - $0.5500 = $0.0010. That gap is about 0.18% of the price. That's tight — meaning the market is liquid and prices are crisp.
You should be suspicious of wide spreads. A spread of 2% means buyers and sellers disagree by a lot, often because the market is thin (not many participants), illiquid, or there's news the wallet can't see. Tight spreads are normal in healthy markets. Wide spreads are a warning.
What you actually pay
When you place a market buy, you walk up the asks: you fill the cheapest one first, then the next, then the next, until your order is full. Your effective price is the weighted average of every level you ate through.
In the example above, if you want to buy 10,000 XRP at market, you eat: * 3,000 at $0.5510 = $1,653.00 * 7,000 at $0.5515 = $3,860.50 * Total: 10,000 XRP for $5,513.50, average price $0.55135.
That's $0.00035 worse than the cheapest ask. Not bad. But notice: your trade moved the book. The next person to buy will start at $0.5520, because you ate everyone below it.
Why this matters
This is the foundation of slippage, which we cover in the next lesson. Every trade moves the price against you a little — sometimes a lot. Understanding by how much, before you sign, is the difference between professional trading and gambling.
Next lesson: a live simulator where you can see this happen in real time.