What you're actually holding, and the numbers that describe who else is holding it.
Spot, futures & perpetuals #
Spot means buying the actual coin — it can sit on the exchange or move to your own wallet, nothing about it expires, and the worst case is the price going to zero. A future is a contract that tracks a coin's price without you owning the coin; traditional futures carry an expiry date, which is the mechanism that forces the contract price and the real price back together. A perpetual future ("perp") is a future with the expiry deleted — it can be held forever, and a recurring payment called funding does the job the expiry date used to do.
Why it matters: Leverage, shorting and liquidation exist only on the contract side of that list. Spot is slow and survivable by construction — no leverage, no liquidation price — which is why it suits someone still learning.
Common misconception: "Futures" doesn't mean a riskier coin. It's the same coin wrapped in a different contract, with a different set of rules for how far and how fast you can lose.
Free lesson: Spot, futures, perpetuals: what you're actually buying
Long / Short #
Long means betting a price rises: buy now, aim to sell higher later. Short means betting it falls — on futures, you can sell borrowed exposure first and buy it back cheaper, profiting from the drop.
Why it matters: Shorting makes the down half of the market tradeable. Without it, the only way to make money is a move up.
Funding rate #
A payment exchanged every 8 hours between long and short holders of a perpetual future, sized as a small percentage of position value. It exists because perpetuals never expire, so nothing else forces their price back to the real (spot) price: when the perp trades above spot, longs pay shorts; when it trades below, shorts pay longs.
Why it matters: The size of the rate is a real-money read on crowding. The more extreme it is, the more one side is paying to stay in the trade — and the more lopsided that side of the market has become.
Common misconception: Positive funding is not a sell signal by itself. It's normal, sometimes for months, in a genuinely rising market — a crowding gauge, most informative at its extremes, and even extremes resolve more than one way.
Free lesson: Funding: the price of a crowded trade
Open interest (OI) #
The total number of futures contracts currently open on a market. Every contract pairs one long with one short, so OI counts live pairs of opposing bets: it rises when a new buyer meets a new seller, and falls when an existing long and an existing short both close.
Why it matters: Price alone tells you what happened; price next to OI tells you who did it. A rally on rising OI is new money opening longs; the same rally on falling OI is shorts buying their way out (short covering) — different fuel, a different tendency afterwards.
Free lesson: Open interest: reading who's in the pool
Long/short ratio #
The share of futures accounts on an exchange currently positioned long versus short, usually shown as a ratio like 1.8:1.
Why it matters: A crowding gauge, same family as funding: when almost everyone is already long, there is little fresh buying left to push price further, and cascades trigger more easily.
Common misconception: A lopsided ratio is not a standalone reversal trigger — it reads best alongside funding and open interest, not on its own.
Liquidation cascade (flush) #
A chain reaction where leveraged positions are force-closed one after another. A liquidation is not a warning — it is an automatic market order placed by the exchange at whatever price is available, and that forced trade pushes price further, reaching the next tier of leveraged positions in turn.
Why it matters: The moves it produces overshoot because the selling (or buying) is forced, not chosen: nobody in the chain is weighing value, and order books are thinnest exactly when the flow is heaviest. The same mechanic running upward against shorts is a short squeeze.
Free lesson: Liquidation cascades: how crypto really moves
CME gap #
Historical — CME moved to 24/7 crypto trading on 2026-05-29, so these no longer form. CME is a regulated US futures exchange. Until that date its crypto futures closed over the weekend while crypto itself carried on trading, so Monday's CME chart opened away from Friday's close — that distance was the gap. The unfilled ones from before the cutover are still real price levels, but the phenomenon itself is finished.
Why it matters: Enough traders watch these levels that they are worth knowing about. But the widely-quoted fill rates trace back to articles that do not contain the numbers they are credited with, so measure rather than repeat: on our own history most gaps were eventually revisited — and price revisits ANY level that distance away roughly half the time anyway, purely from ordinary volatility. The gap is a level of interest, not a magnet.
Common misconception: 'Usually fills' is not 'guaranteed to fill soon', and it is not an edge. Some gaps stay open for months, and a fill rate quoted without its baseline tells you almost nothing.
Free lesson: Weekend drift: what happens when the market reopens
Fear & Greed Index #
A 0-100 crypto sentiment index (alternative.me) combining volatility, volume, social activity and dominance. 0 = extreme fear, 100 = extreme greed.
Why it matters: Useful mainly at the extremes, as contrarian context rather than a trade trigger on its own.
BTC dominance #
Bitcoin's share of the total crypto market capitalization.
Why it matters: Rising dominance usually means money concentrating in the biggest, most liquid asset; falling dominance typically accompanies broader altcoin strength.
Market-neutral basket #
A basket trade that goes long a group of relatively stronger assets and short a group of relatively weaker ones at the same time, sized so a broad market move up or down mostly cancels out between the two sides.
Why it matters: Ordinary spreading across several coins isn't automatically diversified — in a crypto sell-off, correlations rise toward one, and several separate long positions can behave like a single leveraged bet on 'crypto up.' Pairing longs with shorts is one of the few structures that actually reduces that shared exposure.
Free lesson: Five alt longs is one bet