Encyclopedia DeFi · Entry 350
Spot-perpetual basis risk: why a hedged position can still lose
In this article
At a glance
Key facts
| Fact | Detail | Source |
|---|---|---|
| Basis | Funding is designed to encourage alignment, not guarantee identical prices. | [1] |
| No maturity | Perpetuals have no scheduled final expiry. | [1] |
| Separate margin | A hedged economic position can still face contract liquidation. | [2] |
Track both entry and exit differences
In a hypothetical linear example, one unit of spot is bought at 100 and one perpetual unit sold at 102. Later spot is sold at 110 while the perpetual is bought back at 113. Spot gains 10; the short loses 11; combined gross price P&L is −1.
The basis widened from 2 to 3. Equal quantities did not make the combined outcome exactly zero. Funding and fees are additional.
A quoted payment does not lock the spread
A positive observed funding rate may benefit a short at that time, but the rate can reverse. A displayed annualization extrapolates an observation rather than committing future payments. Closing one side of the trade before the other temporarily leaves the position exposed to price changes.
The collateral path matters
If spot is held elsewhere, its gain may not automatically support the short’s margin. A rapid rise can liquidate the short despite the overall hedge. Auto-deleveraging can also reduce a profitable counterposition. Remaining exposure then differs from the originally paired quantities.
Direct answers
Questions people ask
Is a spot-perpetual hedge risk-free arbitrage?
No. Variable basis, funding, execution and separate margin constraints can create losses or break the hedge.
Inspect the evidence
The answer and key facts have stable claim links. These records retain the scope and qualification when reused.
Spot-perpetual basis is the difference between a perpetual’s price and its spot or reference price. Opposing spot and perpetual exposure can reduce directional sensitivity, but the difference between their prices can change. Funding, execution, collateral and forced-position-reduction risks remain; there is no scheduled expiry forcing a perpetual basis to converge.
Scope: DeFi · data through 2026-10-02. Verification: verified · 2026-10-02T19:18:00.092Z.
Link to this claimBasis: Funding is designed to encourage alignment, not guarantee identical prices.
Scope: DeFi · data through 2026-10-02. Verification: verified · 2026-10-02T19:18:00.092Z.
Link to this claimNo maturity: Perpetuals have no scheduled final expiry.
Scope: DeFi · data through 2026-10-02. Verification: verified · 2026-10-02T19:18:00.092Z.
Link to this claimSeparate margin: A hedged economic position can still face contract liquidation.
Scope: DeFi · data through 2026-10-02. Verification: verified · 2026-10-02T19:18:00.092Z.
Link to this claimRevision history
- — First publication after primary-source research and separate automated verification.
Source register
Sources and references
Retrieval dates and locators are recorded individually.- Default funding rates on dYdXdYdX Operations Services
Funding direction, position-sized transfers and governance-adjustable calculation.
Locator: Funding rates; premium; time intervals · Version / scope: Documentation retrieved for the 2026-10-02 editorial scope; content hash recorded · Retrieved: 2026-10-02T18:53:20.972ZOpen source - Liquidations on dYdX ChaindYdX Operations Services
Distinguishes eligibility, order execution and account losses.
Locator: Margin; fillable price; liquidation · Version / scope: Documentation retrieved for the 2026-10-02 editorial scope; content hash recorded · Retrieved: 2026-10-02T18:53:20.755ZOpen source - Trading CoredYdX Foundation
Backstop role and remaining-loss allocation.
Locator: Insurance fund; liquidations config; deleveraging · Version / scope: Documentation retrieved for the 2026-10-02 editorial scope; content hash recorded · Retrieved: 2026-10-02T18:53:21.133ZOpen source
Research and drafting use AI assistance. A separate automated review checks claims against primary sources; no external expert or named human review is implied. Publication, substantive editing, source retrieval and verification are recorded separately. This version was independently checked by an automated reviewer on 2 October 2026.
Editorial method and correctionsDegrees of Satoshi editorial project. “Spot-perpetual basis risk: why a hedged position can still lose.” Published 2026-10-02; updated 2026-10-02. https://degreesofsatoshi.com/encyclopedia/spot-perpetual-basis-risk/