What 'liquidity' actually means for your Aurono strategy
The dinner-table version
Imagine you’re selling a car. A 2018 Volkswagen Golf: dozens of buyers, you can have it sold by next weekend at a fair price. A 1987 DeLorean: maybe three people in the country are interested, and they know they don’t have to hurry.
The Golf is liquid. The DeLorean is not.
The same pattern shows up on every crypto exchange. Some coins are easy to trade — lots of people willing to buy and sell at any moment, prices barely move when you do. Others are thin — only a handful of buyers and sellers around, and even small trades visibly nudge the price. Knowing the difference matters when you’re designing a rule that will run for you, day in, day out.
What’s actually happening on the exchange
Every coin you can trade is paired with another asset — usually a euro or a dollar. “BTC-EUR” means Bitcoin priced in euros. That’s a pair.
For each pair, the exchange runs an order book: a real-time list of who wants to buy at what price, and who wants to sell at what price. Two things from that list determine how liquid the pair is.
The spread. The gap between the highest price someone’s currently willing to pay and the lowest price someone’s currently willing to accept. On BTC-EUR on Bitvavo, this gap is usually around €0.50 on a €40,000 coin — basically nothing, around 0.001%. On a smaller, less-traded coin, the same gap can be 1% or more of the price. That gap is your invisible cost: the moment you buy and immediately sell, you’re already down by the spread.
The depth. How much volume is sitting near the current price. A “deep” market has thousands of euros worth of orders within fractions of a percent of the visible price — you can buy or sell €10,000 without moving the price. A “thin” market has very little nearby — even a €500 trade can shift things noticeably.
A liquid pair has both: tight spread, good depth. A thin pair has neither.
How this shows up in Aurono
Aurono only places limit orders — orders that specify the exact price you’re willing to pay or accept, never the kind that just take whatever the next available price is. That has two specific consequences when liquidity matters.
No surprise fills. You always know in advance the worst price you’d actually pay. There’s no scenario where a thin order book costs you 3% extra on a buy that you expected to land at €40,000. If only prices of €40,300 and up are available, your €40,000 order simply doesn’t fill — it sits on the exchange and waits.
But your order can sit. If your rule fires on a thin pair and your limit price is at the edge of what the market currently offers, the order may sit unfilled for hours, sometimes days. Aurono shows this clearly in its Activity feed: “Order placed, awaiting fill” with the current status. Eventually it either fills, you cancel it manually, or your strategy fires another signal that supersedes it.
The combination is honest: predictability about the price you’d pay, in exchange for occasional uncertainty about when (or whether) the trade actually happens. On liquid pairs you barely notice. On thin pairs you’ll feel it.
Three practical things to do about it
1. Match your trade size to the pair.
A €100 buy on BTC-EUR is a drop in the ocean — nobody on the exchange even notices. The same €100 on a smaller coin can be 5% of all the buy interest visible on the order book — your single trade can move the price. As a rule of thumb: keep each trade under 1% of the visible volume on either side of the order book. If that means dropping from €100 trades on Bitcoin to €25 trades on a smaller coin, do it. Smaller trades on thinner pairs are simply more honest about how much room there actually is.
2. Use wider triggers on thin pairs.
A “buy when price drops 2%” rule on a pair with a 1.5% spread fires almost constantly on the noise of the spread itself, not on real price movement. You’re not buying dips; you’re paying the spread over and over. On thinner pairs, give your triggers more room — 5%, 8%, sometimes 10% drops. Less frequent, more meaningful, and your fills will be cleaner.
3. Pick the right exchange for the pair.
The same coin can be deeply liquid on one exchange and barely traded on another. Bitvavo has the widest selection of EUR pairs and good depth on most of them. Kraken has stronger USD coverage. On Coinbase, depositing euros via iDEAL gives you USDC (a dollar-pegged stablecoin), not EUR — so for any non-major coin you’d be doing two trades (USDC→EUR→target), paying spread on each. For a deeper walk-through of which pair belongs on which exchange, the Bitvavo, Kraken, and Coinbase comparison is where to look.
Two ways to check before you activate
1. Look at the order book on the exchange itself.
Every exchange shows a live order book for each pair. Open BTC-EUR on Bitvavo and you’ll see two columns of rows — buys on one side, sells on the other — each row showing a price and an amount. If hundreds of rows within 1% of the current price total tens of thousands of euros, you’re in a deep market. If you can count five rows totalling €800, you’re in a thin one. Repeat the same exercise on the pair you’re considering, and the difference will be obvious within ten seconds.
2. The common-sense check.
Coins in the top 30–50 by market value, on a major European exchange, on a EUR pair, are almost always liquid enough for retail-sized trades. Below that, expect to look harder. Below the top 200, expect serious thinness — the kind where a Saturday-morning €1,000 trade can sit for a day before someone takes the other side. None of this is a hard rule, but it’s a useful starting filter when you’re picking what to put a strategy on.
The takeaway
Liquidity isn’t a mystery. It’s just this: how easily can you actually buy or sell the amount you want, at a price near what you see on screen, without your own trade being the thing that moves the price?
The thinner the market, the more careful your strategy should be — smaller trade sizes, wider triggers, and ideally on the exchange where the pair is deepest. The right strategy doesn’t exist in isolation. It exists for a specific pair, on a specific exchange, with a specific size of trade. Match the three, and Aurono will run it cleanly for you.
Aurono lets you set rules in plain language and runs them on your own device. Pick the right pair, size your trades sensibly, give your triggers room to breathe — and Aurono handles the rest.
Try Aurono for free in shadow mode — €99 license unlocks live trading.