Basis, Contango & Backwardation in Crypto Futures
What the gap between futures and spot tells you — basis, contango, and backwardation — and how the perpetual funding rate keeps that gap in check. A trader's primer.
The gap between a futures price and spot has a name — the basis — and its sign tells you a lot about market sentiment. If you trade or run derivatives, understanding basis (and its two named states, contango and backwardation) is fundamental to reading the market.
Basis: the futures-vs-spot gap
Basis is simply the difference between the spot ("cash") price and the futures price. It's the general language for the cash-futures gap, and it works across every futures market (Cube). Contango and backwardation are just names for the sign of that gap:
| State | Relationship | Typical read |
|---|---|---|
| Contango | Futures above spot | Bullish/normal; cost-of-carry positive |
| Backwardation | Futures below spot | Often bearish or supply-stressed |
A market is in contango when the futures price is higher than spot, and in backwardation when futures are below spot (Britannica). As a dated future approaches expiry, its price converges toward spot — the basis shrinks to zero.
Where perpetuals fit
Perpetual futures have no expiry to force convergence, so they use a different tool: the funding rate. Funding is a periodic payment between longs and shorts that pushes the perpetual's price back toward spot — the mechanism that keeps the perp-spot basis near zero over time (Cube). When perps trade at a premium (positive basis), longs pay shorts, nudging the price down; at a discount, the reverse.
Why it matters to traders — and operators
- Traders watch basis for sentiment and for basis trades — arbitraging an unusually wide gap against financing costs.
- Operators feel basis directly: it flows into your mark price (which blends the index with a basis component) and drives the funding payments your venue calculates and settles. A healthy funding mechanism keeping basis tight is a sign of a well-run perpetual market.
The takeaway
Basis is the futures-minus-spot gap; contango means futures trade rich, backwardation means they trade cheap. Dated futures converge at expiry; perpetuals use the funding rate to hold basis near zero. Read basis as a sentiment gauge — and, if you operate a venue, as a live input to your mark price and funding.
- What Is Basis? (basis, contango, backwardation, funding) — Cube Exchange
- Contango vs. Backwardation in Futures Markets — Britannica Money
Educational content, not trading or investment advice.
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