Perp DEX Open Interest: Live Ranking, What OI Means and How to Read It

1. Live ranking: perp DEXs by open interest

The table below is rebuilt from CoinGecko’s derivatives-exchange feed every time the site builds (about every six hours), sorted by open interest. Vol ÷ OI is the daily churn: how many times the open positions turned over in 24 hours. Share is each venue’s part of the open interest across the 20 DEXs tracked here. For fees, leverage and pair counts, see the full perp DEX ranking.

Data as of Tue, 20 Oct 2026 00:59 UTC. Source: CoinGecko /derivatives/exchanges (open interest and volume in BTC), converted at Hyperliquid’s BTC mid price of $82,074. CoinGecko does not put venues on one counting basis (Lighter appears at about twice its own API total), so treat absolute levels with care (section 2). Hyperliquid includes its HIP-3 builder markets. “Trade” links carry our referral codes.

How to read it: in this build, Extended turned over its open interest 2.65 times in a day, the fastest among the ten largest, while Hyperliquid turned over only 0.51 times. Very high churn relative to OI often means volume driven by points or fee rebates. OI is harder to inflate because it ties up margin, which is why this page ranks by it.

2. Which number to trust: why DefiLlama, CoinGecko and CryptoRank disagree

The two tools Google puts first for “open interest DEX” are DefiLlama and CoinGecko. For the same DEX at the same hour, they can differ by about 2×. We pulled each venue’s own API and both trackers at about 19:00 UTC on September 26, 2026:

3. Hyperliquid open interest

Current value. Hyperliquid’s core perp markets carried $11.05B of open interest in the build of October 20, 2026 (sum of openInterest × mark price across 178 live markets). Including the HIP-3 markets, CoinGecko showed $15B on October 20, 2026, which is 65.6% of the open interest across the perp DEXs in our table. At 19:00 UTC on September 26 the split was $12.96B core plus $3.88B across HIP-3 dexes, almost all of it on trade.xyz ($3.80B; stocks, indices and commodities). The largest core markets were BTC ($3.13B), ETH ($2.96B) and HYPE ($1.89B).

To see which wallets hold that open interest, look them up with the Hyperliquid Explorer & Scan tools.

Where to see it:

• Trade page. The market header above the chart shows open interest, 24h volume and funding for the selected market.
• Funding Comparison page (app.hyperliquid.xyz/fundingComparison). A table of markets sorted by Hyperliquid OI, next to Binance and Bybit funding. It is the quickest OI ranking inside the app, though it leaves out some markets (HYPE was missing on September 25).
• API. POST { "type": "metaAndAssetCtxs" } to api.hyperliquid.xyz/info; add "dex": "xyz" for trade.xyz (section 12).
• History. TradingView’s crypto open interest indicator has Hyperliquid from September 2025, Trade[XYZ] HIP-3 from October 2025 and Paragon HIP-3 from April 2026. The HIP-3 markets are not in its aggregated series.
• Every market at once: our Hyperliquid open interest by market table (volume, OI, leverage, funding; rebuilt every six hours).

More on the venue: Hyperliquid review · Hyperliquid fees · how to use Hyperliquid.

4. Lighter open interest

Current value. CoinGecko showed Lighter at $1.1B of open interest on October 20, 2026, number 4 among perp DEXs by OI and 4.8% of the table. Treat that level with care. Summing Lighter’s own API at 19:00 UTC on September 26 gave $613M across 210 active markets, about half of CoinGecko’s figure at the same hour, and DefiLlama (which calls Lighter’s field one-sided) showed $614M. The largest markets were BTC ($166M), ETH ($111M) and Lighter’s own LIT token ($56M). The same API showed about $621M of 24-hour volume, roughly 1× its open interest.

Where to see it: the trade page header shows Open Interest for each market next to mark price, 24h volume and the 1-hour funding rate. By API, GET https://mainnet.zklighter.elliot.ai/api/v1/orderBookDetails returns open_interest (in the base asset) and mark_price for every market; multiply and sum the active ones. Lighter’s deployment on Robinhood Chain is tracked as a separate venue (DefiLlama showed another $226M there).

5. What open interest counts, with a worked example

Every derivatives position has a counterparty. If you are long 1 BTC in a perpetual, someone is short 1 BTC. Open interest adds up the positions that are still open. The standard convention counts one side, so total open longs equal total open shorts, and OI equals either one (not every venue follows it; section 8). Hyperliquid’s API reports OI in coins. Multiply by the mark price for the dollar value: 39,983 BTC × $84,800 ≈ $3.39B at 09:31 UTC on September 25, 2026.

Follow one hypothetical market through a day. It starts with 100 BTC of open interest:

By the end of the day, 26 BTC traded but OI moved only from 100 to 102. That gap is the whole point: volume says trades happened; OI says whether they added exposure or took some away. The general rules:

OI never tells you who is long. Longs and shorts are always equal. What changes is who is paying to hold, which is what funding shows.

6. Open interest vs volume

Volume is the notional that changed hands over a window. Hyperliquid’s dayNtlVlm covers a rolling 24 hours. OI is what is still open right now. Divide volume by OI and you get a churn ratio: how many times the open positions turn over per day.

• Exchange-wide (Hyperliquid core, build of October 20, 2026): $4.03B ÷ $11.05B = 0.37.
• High churn among markets with more than $50M of OI (snapshot, September 25): ONDO 1.95, BTC 1.03, XPL 1.01, NEAR 0.73. These are dominated by intraday trading, so positioning changes within hours.
• Low churn (same snapshot): BNB 0.14, AAVE 0.16, ZRO 0.20, DOGE 0.21. Positions here are held rather than traded, so a 5% OI change took days to build and matters more.

Across exchanges, the same ratio helps you spot inflated volume. The Vol ÷ OI column in the live table does this for every DEX.

7. Is high open interest good? Does it mean liquidity?

For a venue: mostly yes. OI is money traders are willing to leave on the exchange as margin, so it is a better measure of trust and real usage than volume. That is why we rank DEXs by it.

But OI is not liquidity. Liquidity is how much you can trade near the current price: order-book depth and spread. OI is how much is already positioned. A market can hold a lot of OI that rarely trades. On September 26, trade.xyz carried $3.80B of OI against $0.52B of 24-hour volume, a churn of about 0.14. Before a large order, check the book, not the OI.

For a single market: high OI relative to its own history means more leverage is waiting to be unwound. That is fuel for sharp moves in either direction, not a buy or sell signal. Read it with funding (section 10) and a liquidation map.

8. One-sided vs two-sided reporting

This is the detail most OI explainers skip, and it can double a number. Exchanges do not all count the same way:

Hyperliquid core from the registry’s live fact (its API); the other rows from their own APIs and docs or CoinGecko’s derivatives API (converted at BTC $84,700), read at about 09:30 UTC on September 25, 2026; Polymarket Perps from its exchange stats (September 24).

Bybit is explicit. Its v5 docs define openInterest as “the sum of both sides” and singleOpenInterest as “the single side”. On September 25 the BTCUSDT values were 60,214.57 and 30,107.29 BTC, exactly half. GMX publishes long OI ($138.4M) and short OI ($134.7M) and adds them into a $273.1M total. Polymarket Perps labels its figure one-sided. Hyperliquid and dYdX return one OI field per market and do not say which convention they use. DefiLlama treats Hyperliquid’s as two-sided (section 2).

Why it matters: CoinGecko listed Bybit’s BTCUSDT OI at $5.03B on September 25. That is Bybit’s both-sides value; one side was about $2.52B. The same page showed Binance BTCUSDT at $8.15B and Hyperliquid BTC at $3.37B. So “Hyperliquid BTC OI is two-thirds of Bybit’s” and “Hyperliquid BTC OI is larger than Bybit’s” can both come from the same data, depending on which number you use. Before comparing venues, check the label, or compare each venue only with itself over time.

9. Snapshot: Hyperliquid’s largest markets

A dated snapshot from metaAndAssetCtxs at 09:31 UTC on September 25, 2026, when Hyperliquid had 178 live perp markets. The API also returns delisted entries, so filter them out before summing. For current values, use the Hyperliquid markets table.

Three things stood out. Concentration: BTC was 25.7% of exchange OI and the top five 74.7%. Only 14 markets had more than $100M of OI, and 23 had more than $50M. HYPE and ETH are held, not traded: each had about three dollars of OI for every dollar of daily volume. Funding was calm on the majors: all five sat at the 0.00125%/hour baseline despite gains of 2–7%. NEAR was different. It rose 18.8% in 24 hours and paid 0.0051% per hour, four times the baseline, so longs were paying up to hold it. The HIP-3 markets sit on top of this; details in trade.xyz on Hyperliquid.

10. Reading OI with price, volume and funding

Volume separates conviction from drift: an OI change on above-average volume shows commitment, and the same change on thin volume means little. Funding shows who is paying. Hyperliquid charges funding every hour. It has an interest component of 0.00125%/hour, which longs pay shorts even when the perp trades flat to the oracle, and a cap of 4% per hour. Rising OI with funding far above baseline means the new positions are longs paying a premium. At 0.05%/hour, a $10,000 long pays $120 a day. The mechanics are in our Hyperliquid funding rate guide.

11. Dated examples from September 2026

Hyperliquid’s API returns only current OI, so for history we use Binance’s public openInterestHist (daily snapshots at 00:00 UTC) for BTCUSDT, with daily prices from its klines:

Binance fapi futures/data/openInterestHist period=1d and fapi/v1/klines 1d, fetched September 25, 2026. OI is the 00:00 UTC snapshot before and after each day.

The September 21 row is the lesson most people miss. Dollar OI rose 8%, but almost all of that was price. Over the whole window, Binance BTC OI went from 105,594 BTC on August 27 to 95,873 BTC on September 25. That is its lowest reading in the 30 days, even though BTC traded about 6–7% higher. So the September rally ended with less leverage in the market, not more.

12. Where to get open interest data

• Hyperliquid API (no key). POST { "type": "metaAndAssetCtxs" } to https://api.hyperliquid.xyz/info. The response pairs universe (name, maxLeverage, isDelisted) with asset contexts in the same order. Each context has openInterest (coins), markPx, dayNtlVlm, funding, premium and prevDayPx. Add "dex": "xyz" for trade.xyz; { "type": "perpDexs" } lists every HIP-3 dex. The call gives the current value only, so log it hourly to build your own history. See the Hyperliquid API guide.
• Lighter API (no key). /api/v1/orderBookDetails returns open_interest, mark_price and daily volume for every market (section 4).
• DefiLlama open interest. A sortable, filterable table of perp DEXs (and prediction markets) with history and CSV export. It normalizes to one side where it believes a venue reports two (section 2).
• CoinGecko derivatives. Exchange-level OI (in BTC) and per-contract open_interest_usd for most perp DEXs and CEXs, without normalizing the counting method. Our live table uses this feed.
• Exchange APIs with history. Binance futures/data/openInterestHist gives 30 days. Bybit /v5/market/open-interest gives both-sides and single-side values. dYdX’s indexer candles include startingOpenInterest. GMX’s stats API splits long and short.
• TradingView. The crypto open interest indicator covers the big CEXs from February 2020 and Hyperliquid from September 2025, with Trade[XYZ] and Paragon HIP-3 markets available per symbol but not in the aggregate. It also plots Hyperliquid funding, liquidations and long/short ratios.
• Per-account data. On Hyperliquid, large individual positions are public. See the whale tracker guide and the liquidation map.

13. Comparing DEX and CEX open interest

The biggest CEXs still hold more open interest than any DEX. CoinGecko’s exchange-level figures at 09:30 UTC on September 25, 2026 (converted at BTC $84,700): Binance $35.0B, Bybit $15.1B (both-sides convention), OKX $8.0B. Set Hyperliquid’s $15B on the same feed (latest build, HIP-3 included) against those, and remember that a one-sided comparison would roughly halve Bybit’s number. Three rules for lists like this:

• Check the counting method first. Bybit’s headline figure counts both sides; DefiLlama halves Hyperliquid’s and edgeX’s.
• Compare OI with volume. High churn relative to OI often points to incentive-driven volume (Vol ÷ OI column above).
• OI is harder to fake than volume, because it ties up margin. Head-to-heads: Hyperliquid vs dYdX, Hyperliquid vs GMX, Hyperliquid vs Bybit, and the DEX vs CEX fee comparison.

14. Five ways to use OI in a trading plan

1. Confirm a breakout before chasing it. When a level breaks, check whether OI (in coins) rose through the break. If price moved but OI did not, it was covering or a sweep of a thin book. Wait for a retest.
2. Watch divergence at highs and lows. Price makes a higher high while OI makes a lower high, so fewer positions are carrying the move. That is a fade setup only with a tight stop, because divergences can last longer than your margin.
3. Trade after the flush, not during it. Price gaps down, volume spikes, OI drops several percent within an hour and funding snaps toward zero. Forced sellers are done once OI stops falling, and that is when entries have the best risk-reward.
4. Use funding and OI together as a crowding filter. Don’t add to a long when OI is at a multi-week high and funding is several times baseline. The holding cost eats the trade, and the crowded side is the one that gets liquidated.
5. Pick markets with enough OI. Below a few tens of millions of dollars, one participant can dominate positioning and OI turns into noise. On September 25, about 23 Hyperliquid markets had more than $50M. Treat the rest as event-driven. Size positions with the liquidation price calculator in mind.

15. Pitfalls

• Dollar OI moves with price. Compare OI in coins, or deflate it by price, before calling a change in positioning (see September 21 above).
• Mixed conventions and scopes. Adding Bybit’s both-sides OI to one-side figures overstates the total, and so does adding trade.xyz on top of a Hyperliquid figure that already includes it.
• OI is symmetric. It cannot tell you the long/short split. Funding and price direction show which side is aggressive.
• One reading is only a level. Every pattern above is a change, so you need a series before direction means anything.
• Delisted and builder markets. On Hyperliquid, sum the main dex without delisted entries, and add HIP-3 dexes only on purpose.
• Incentives distort. Points programs can reward holding OI as well as trading volume, so part of a venue’s OI may exist to farm rewards.

16. FAQ

Disclosure: HOLYGRAIL (Hyperliquid, edgeX), 718610TD (Lighter) and DTLpLc (Aster) are our referral codes, and we earn a share of referred accounts’ fees at no cost to you. The ranking table and Hyperliquid totals are rebuilt from the CoinGecko and Hyperliquid APIs every six hours; the tracker comparison was read at about 19:00 UTC on September 26, 2026 from the Hyperliquid, Lighter and edgeX APIs, CoinGecko and DefiLlama; other figures are dated where they appear. Open interest changes by the minute. Not investment advice.