Aster vs Ostium
A side-by-side comparison of two perpetual DEXs using the same sources and capture time. Larger is not automatically better: check fees, markets, collateral and access rules for your own use.
- Aster holds 152.4× the open interest of Ostium ($1.35B vs $8.85M).
- Over the last 30 days traders paid $5.36M in fees on Aster and $103.13K on Ostium.
- Aster’s average open interest moved +22.3% over 30 days.
- Ostium’s average open interest moved -58.5% over 30 days.
 Aster |  Ostium | |
|---|---|---|
| Open interest | $1.35B | $8.85M |
| OI rank (of 50) | 2 | 32 |
| OI change · 30d | +22.3% | -58.5% |
| Volume · 24h | $1.98B | — |
| User fees · 30d | $5.36M | $103.13K |
| Fees change · 30d | -5.1% | -82.0% |
| Trend | Stable | Declining |
| Chains | — | Arbitrum |
| Model | Order book | Liquidity-pool vault with oracle pricing; directional flow hedged off-chain with institutional partners (Jump) |
| RWA markets | Yes | Yes |
| Token | ASTER | None verified |
| Base trading fees | Taker 0.04% · maker 0% (Pro (order book) Crypto-General base tier: maker 0%, taker 0.04% (VIP tiers lower). Group B pairs taker 0.1%; RWA perps taker 0.0125% all tiers (from 2026-09-07); 1001x/simple mode 0.08% open/close (0% open at 500x+ with PnL fee on BTCUSD)) ↗ | 0.06% per trade ↗ |
| Max leverage | 1001× ↗ | 200× ↗ |
| Collateral | USDT, USD1 (single-asset); multi-asset mode adds USDC, USDF, BNB, ASTER and others ↗ | USDC (Arbitrum) ↗ |
| KYC | Not required ↗ | Not verified |
| Referral program | Yes; any discount for the referred trader is set by the referrer ↗ | Yes; no fixed benefit for the referred trader is confirmed ↗ |
Open interest over time
- Aster $1.34B
- Ostium $8.85M
DefiLlama daily open interest. Missing days are left as gaps. The scale starts at zero.
Open interest and fees: DefiLlama, captured 08 Oct 2026 · 14:43 UTC. 24h volume: CoinGecko derivatives exchange data (rolling 24 hours, converted from BTC), captured 08 Oct 2026 · 14:43 UTC. Token prices and 30-day price change: CoinGecko, at the time shown on each venue page; a parent-project or chain token is labelled and is not evidence of a claim on exchange revenue. Changes compare the last 30 days with the previous 30 days (OI as a daily average, fees as a total) and need at least 95% daily coverage. A trend label needs the 30-day move to pass a threshold (OI ±25%, fees ±30%) on a minimum base (OI ≥ $5M, fees ≥ $100K per 30 days); with 90 days of history both horizons must agree. Venue-reported volume is not audited; ⚑ marks volume above 25× open interest. “—” means unavailable, never zero. Full method ↗