What is a crypto volatility index and how does DVOL work?

A crypto volatility index is a single number that shows how large the options market expects price moves to be over the coming month. It works like the VIX for US stocks, but uses bitcoin or ether options instead of S&P 500 options. It measures expected movement in either direction, not whether prices will rise or fall.

What is a crypto volatility index measuring?

It measures implied volatility. Options get more expensive when traders expect bigger swings, so their prices can be worked backward into an estimate of future volatility. A volatility index blends many options into one figure for a fixed 30-day horizon.

This is different from realized volatility, which looks back at how much prices actually moved. The reasons crypto moves so much in the first place are covered in why crypto is so volatile, and the contracts behind these indexes are explained in what crypto options are.

How does the Deribit volatility index (DVOL) work?

Deribit, a crypto options exchange that Coinbase bought for about $2.9 billion in a deal completed in August 2025, launched DVOL on March 31, 2021. Its API publishes two versions, one for bitcoin and one for ether.

Deribit's methodology picks the two option expiries just under and just over 30 days away. It takes prices from the order book, drops options with a delta below 5 percent, and applies a variance swap formula to each expiry. The two results are blended by time to get a 30-day figure. A raw value is calculated every second and then smoothed with a moving average.

Deribit also lists futures on DVOL. These let traders take a position on volatility itself without holding options.

How do you read bitcoin DVOL and implied volatility in crypto?

DVOL is annualized. Deribit's own rule of thumb is to divide it by the square root of 365, about 19.1, to get the expected one-day move. A DVOL of 90 therefore implies daily swings of around 4.7 percent. A rougher shortcut is to divide by 20.

A high reading means options are pricing in large moves. It does not say which way. Deribit notes that bitcoin options often price in big moves both up and down, so it calls DVOL more of a fear and greed gauge than a pure fear gauge.

Are there other bitcoin volatility indexes?

Yes. CF Benchmarks publishes the CF Bitcoin Volatility Index, known as BVX, which is built only from CME bitcoin options, a market regulated by the CFTC. It also targets a 30-day horizon and is calculated every second during CME trading hours. CF Benchmarks says bitcoin implied volatility has often risen alongside price, unlike the VIX, which usually jumps when stocks fall, though it notes this has not always held.

Volatility indexes are one input to broader mood gauges such as the crypto fear and greed index. They describe what options traders expect, and those expectations can be wrong.