# Spot-perpetual basis risk: why a hedged position can still lose

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.

Evidence: [Default funding rates on dYdX](https://help.dydx.trade/en/articles/166992-default-funding-rates-on-dydx); [Liquidations on dYdX Chain](https://help.dydx.trade/en/articles/166991-liquidations-on-dydx-chain); [Trading Core](https://docs.dydx.community/dydx/modules/governance/governance-adjustable-parameters/trading-core)

Canonical: https://degreesofsatoshi.com/encyclopedia/spot-perpetual-basis-risk/
Published: 2026-10-02
Substantively modified: 2026-10-02
Independently verified by an automated reviewer: 2026-10-02T19:18:00.092Z
Data current through: 2026-10-02

AI-assisted research and drafting with a separate automated source-verification pass; no external expert or named human review is implied.

## Key facts

- **Basis:** Funding is designed to encourage alignment, not guarantee identical prices. ([Default funding rates on dYdX](https://help.dydx.trade/en/articles/166992-default-funding-rates-on-dydx))
- **No maturity:** Perpetuals have no scheduled final expiry. ([Default funding rates on dYdX](https://help.dydx.trade/en/articles/166992-default-funding-rates-on-dydx))
- **Separate margin:** A hedged economic position can still face contract liquidation. ([Liquidations on dYdX Chain](https://help.dydx.trade/en/articles/166991-liquidations-on-dydx-chain))

## 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.

Evidence: [Default funding rates on dYdX](https://help.dydx.trade/en/articles/166992-default-funding-rates-on-dydx)

## 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.

Evidence: [Default funding rates on dYdX](https://help.dydx.trade/en/articles/166992-default-funding-rates-on-dydx)

## 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.

Evidence: [Liquidations on dYdX Chain](https://help.dydx.trade/en/articles/166991-liquidations-on-dydx-chain); [Trading Core](https://docs.dydx.community/dydx/modules/governance/governance-adjustable-parameters/trading-core)

## Questions

### Is a spot-perpetual hedge risk-free arbitrage?

No. Variable basis, funding, execution and separate margin constraints can create losses or break the hedge.

Evidence: [Default funding rates on dYdX](https://help.dydx.trade/en/articles/166992-default-funding-rates-on-dydx); [Liquidations on dYdX Chain](https://help.dydx.trade/en/articles/166991-liquidations-on-dydx-chain); [Trading Core](https://docs.dydx.community/dydx/modules/governance/governance-adjustable-parameters/trading-core)

## Claims and scope

### spot-perpetual-basis-risk-quick-answer

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: {"collection":"defi","dataAsOf":"2026-10-02","blockHeight":null}

### spot-perpetual-basis-risk-fact-basis

Basis: Funding is designed to encourage alignment, not guarantee identical prices.

Scope: {"collection":"defi","dataAsOf":"2026-10-02","blockHeight":null}

### spot-perpetual-basis-risk-fact-no-maturity

No maturity: Perpetuals have no scheduled final expiry.

Scope: {"collection":"defi","dataAsOf":"2026-10-02","blockHeight":null}

### spot-perpetual-basis-risk-fact-separate-margin

Separate margin: A hedged economic position can still face contract liquidation.

Scope: {"collection":"defi","dataAsOf":"2026-10-02","blockHeight":null}

## Sources

- [Default funding rates on dYdX](https://help.dydx.trade/en/articles/166992-default-funding-rates-on-dydx) — dYdX Operations Services. Funding direction, position-sized transfers and governance-adjustable calculation. Locator: Funding rates; premium; time intervals. Retrieved: 2026-10-02T18:53:20.972Z.
- [Liquidations on dYdX Chain](https://help.dydx.trade/en/articles/166991-liquidations-on-dydx-chain) — dYdX Operations Services. Distinguishes eligibility, order execution and account losses. Locator: Margin; fillable price; liquidation. Retrieved: 2026-10-02T18:53:20.755Z.
- [Trading Core](https://docs.dydx.community/dydx/modules/governance/governance-adjustable-parameters/trading-core) — dYdX Foundation. Backstop role and remaining-loss allocation. Locator: Insurance fund; liquidations config; deleveraging. Retrieved: 2026-10-02T18:53:21.133Z.

## Revision history

- 2026-10-02: First publication after primary-source research and separate automated verification.

## Cite this entry

Degrees 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/