13 October 2026 · 4 min read
Crypto futures and perpetuals, what the build involves
Margin, funding, liquidation and an insurance fund. The heaviest thing you can commission, why it is quoted per project, and the questions that decide whether it survives a bad hour.
Perpetual futures are the most requested upgrade after spot, and the least understood. The interface is nearly the same. Everything behind it is different, because on a spot venue a user can only lose what they deposited, and on a leveraged venue they can lose more than that, which makes it your problem.
What has to exist
Positions, not balances. Spot is a ledger of what people hold. Derivatives is a ledger of what people owe, marked continuously against a price.
Margin. Initial and maintenance, per position or cross account. Every deposit, fill and price move changes the number.
A mark price. Not your last traded price. Marking against a thin internal book means one trade can liquidate a hundred users, and that is the fastest way to lose a user base permanently.
Funding. For perpetuals, a periodic payment between longs and shorts that keeps the contract near spot. It has to be calculated, charged and shown clearly.
Liquidation. The engine that closes a position before equity goes negative: partial closes, an auction or backstop, and a queue that behaves under load.
An insurance fund. Because liquidation does not always clear at the price it needed, and the difference comes from somewhere. If there is no fund, the shortfall is socialised across profitable users, which is a policy decision you should make deliberately rather than discover.
On a spot venue a bug costs you a bad day. On a leveraged venue a bug during a volatile hour costs you the venue.
Why it is quoted per project
Because the spread between versions is enormous. Isolated margin on one pair with a conservative liquidation engine is a bounded project. Cross margin across twenty pairs with portfolio risk, auto deleveraging and a public insurance balance is an order of magnitude more.
The variables that move the price:
- isolated or cross margin
- how many contracts at launch
- mark price source and how it fails
- liquidation design: full, partial, auction
- insurance fund and whether shortfalls are socialised
- what the console must show an operator during a fast market
The questions that matter before anybody quotes
1. What is the mark price, where does it come from, and what happens when that source fails?
2. What happens when liquidation cannot fill at the required price?
3. Can the operator halt a single contract without stopping the venue?
4. What does a user see during liquidation, before and after?
5. Where does the shortfall go when the insurance fund is empty?
If a vendor has no crisp answer to question two or five, they have built a trading interface rather than a derivatives venue.
Should you launch with it
Usually not. Spot first, prove there is volume, then add leverage where the liquidity exists to support liquidations. Launching derivatives into a thin book means the first volatile hour liquidates users at prices they will rightly complain about.
If spot is running and you want to know what adding futures involves for your specific pairs, that is a scoping conversation rather than a price list. Everything else about how a build is delivered, owned and hosted is the same as the rest of the pricing.
Questions
How much does a crypto futures exchange cost to build
It is quoted per project rather than from a fixed price, because isolated margin on one contract and cross margin across twenty with auto deleveraging are different orders of work. Spot builds start at $999; derivatives are scoped.
What is the difference between spot and futures development
Spot tracks what users hold. Futures tracks what they owe, marked continuously against a price, with margin, funding, liquidation and an insurance fund. The screens look similar, the engines do not.
What is a mark price and why does it matter
The price used to value positions and trigger liquidations. It should come from outside your own book, because marking against a thin internal book lets a single trade liquidate many users.
What happens if liquidation cannot fill
The position closes worse than required and the difference comes from the insurance fund. If the fund is empty, the shortfall is socialised across profitable users unless another mechanism exists. That policy should be chosen deliberately before launch.
Can I add futures to an existing spot exchange
Yes, and that is the right order. Accounts, custody and the console are shared, so the work is the margin, funding and liquidation engine plus the risk screens an operator needs.
Should a new exchange launch with leverage
Rarely. Liquidations into a thin book produce fills users will dispute. Prove spot volume first, then add leverage where there is liquidity to support it.