Perpetual Futures: The Fine Print That Shapes Your Risk

The contract is the thing you actually trade

When people talk about "buying Bitcoin" or "shorting Ethereum," they usually mean the spot market: you buy the coin, you own the coin. Crypto derivatives are different. You are trading a contract — a written agreement with rules attached. And those rules, not your chart-reading skills, decide a surprising amount of what happens next.

In the United States, exchanges that list these contracts for retail traders operate as designated contract markets, or DCMs. A DCM is an exchange registered with and overseen by the Commodity Futures Trading Commission, the CFTC, under the Commodity Exchange Act. Think of it as the futures-exchange model: standardized products, published rules, surveillance, and a regulator with authority to examine the venue. DCMs may list futures or options on almost any underlying, including digital assets, and they file new contracts either by self-certifying that the product complies with the law or by requesting CFTC approval.

That matters for a simple reason. Every contract specification is a risk decision someone made on your behalf, before you ever clicked buy.

Perpetuals: futures with no finish line

Perpetual futures — "perps" — are the dominant derivative in crypto. A perpetual is a futures contract with no expiry date. You can hold it indefinitely as long as you keep enough margin posted. The idea traces back to economist Robert Shiller, who proposed a perpetual claim on an asset's cash flows in 1993. BitMEX launched the crypto version in 2016, and it took over: perpetuals account for roughly 93 percent of all crypto derivatives trading, with daily volumes often above $100 billion.

Because there's no expiry, the usual gravitational pull of a futures contract — the guarantee that price converges to spot on settlement day — doesn't exist. Instead, an exchange runs a funding rate, a periodic payment exchanged between longs and shorts to nudge the contract price back toward spot. If the perpetual trades above spot, longs pay shorts. If it trades below, shorts pay longs. That's the whole trick, and it's an elegant one.

Funding intervals: the clock you're actually trading against

Funding is usually charged every eight hours, typically synced to set UTC checkpoints — three times a day. Some venues use four or twelve hour windows, and some on-chain protocols adjust based on events. The exact schedule, formula, and caps vary by platform, so "how often is funding paid" has a boring but honest answer: it depends where you trade.

Here's the part people underestimate. Funding applies to your position's notional value, not the margin you posted. A small-looking rate compounds. Take a hypothetical: a steady 0.3 percent per eight-hour interval — not unusual during strong bullish stretches — means roughly 0.9 percent per day, about 6.3 percent of notional over a week, and something approaching 27 percent over a month. On a $10,000 notional position, that's around $630 of funding in a week, entirely separate from price movement. At 10x leverage, where $1,000 backs that $10,000 position, the same weekly cost is roughly 63 percent of your margin. The price could sit perfectly still and still push the position toward liquidation.

Funding is also a sentiment meter. Persistently elevated positive funding means longs are crowded — more people are willing to pay to hold long exposure than there are shorts to take the other side. There's no universal threshold that reliably signals a reversal. It's context, not a crystal ball, and anyone promising otherwise is selling something.

Tick size and lot size: the grid your order lives on

Tick size is the smallest price increment a contract can move. Lot size is the smallest quantity you can trade. Neither sounds dramatic, yet together they set the grain of the market. A coarse tick size means your entry and exit can land further from where you intended; a large lot size means a small account may be forced into a chunkier position than it wanted, or priced out entirely.

Market structure research on perpetuals found that trading activity and bid-ask spreads follow a U-shaped pattern within each eight-hour funding cycle — and that pattern shows up in spot markets too. The contract's schedule shapes the market's breathing, not just the contract holder's costs. Venue liquidity compounds this. Research comparing Binance and Bybit found Bybit's effective spread on the Bitcoin perpetual exceeded Binance's on every sampled day, by a factor of two to ten. Same asset, different venue, materially different cost of getting in and out.

Position limits: the ceiling nobody reads until they hit it

Position limits cap how large a position any one participant can hold. For DCMs, "Position Limitations or Accountability" is one of the twenty-three core principles an exchange must satisfy on an ongoing basis to keep its designation. There's a good reason: concentrated positions invite manipulation and disorderly markets. Position limits are also a live factor in leverage. Exchanges often reduce maximum leverage as position size grows, and margin requirements climb with size too.

So leverage isn't a single dial you set and forget. It's a number the venue, the contract and your position size all have a vote in.

Where jurisdiction changes the answer

This is not a global rulebook. CFTC oversight applies to DCMs and to US-regulated activity; offshore and decentralized venues answer to different regimes, and some are not registered in the US at all. Some platforms restrict US users. Some allow access to 100x or higher leverage; regulated venues typically do not. Safety, margin rules, funding formulas, and what happens if an exchange fails — all of it is jurisdiction-dependent, and that word "depends" is doing real work.

Worth noting: leverage magnifies both directions, and large leveraged positions can be liquidated automatically if equity falls below maintenance margin. That's not a scare tactic, it's just the mechanic.

What to actually look at before you trade

Contract specs are the user manual, and most people skip them. Before opening a perp, it's worth knowing: what's the tick size and lot size? How often is funding charged, and at what checkpoints? Is there a cap or clamp on the funding rate? What leverage does this contract actually allow at your position size, and what are the position limits? Is this venue regulated where you live, and by whom?

None of that is exciting. All of it is the difference between understanding your risk and discovering it later. The contract was designed by someone. Reading the specs is how you find out whether that design works for you — or just works on you.