Platform Fees Overview

Fee Structure

Overview

Ostium implements a transparent and trader-friendly fee structure designed to minimize costs while ensuring platform sustainability. Our fee model consists of opening fees, conditional closing fees, and time-based fees that vary by asset class.

Fee Components

Opening Fees

A one-time opening fee is charged when a position is opened. This fee varies by asset class and trading conditions:

Crypto Pairs

Crypto fees depend on leverage and open interest (OI) dynamics:

• Maker Fee (3 bps): Applied when leverage ≤ 20× AND the trade reduces OI imbalance

• Taker Fee (10 bps): Applied when leverage > 20× OR the trade increases OI imbalance

• Mixed Trades: Maker fees apply to the balancing portion, taker fees to the imbalance-creating portion

Non-Crypto Pairs

Non-crypto assets use a simplified static taker fee model:

Asset Class	Opening Fee
Indices	5 bps
Forex	3 bps
Stocks	10 bps

Closing Fees

Our profit-aligned closing fee structure ensures traders are only charged platform fees on successful trades:

• Losing Trades: 0 bps (no closing fee)

• Winning Trades: 3 bps platform fee

Note: There are no closing fees for liquidated positions, as liquidation rewards serve as the effective fee.

HEDGE Token Buybacks

A portion of platform fees generated from winning trades will be allocated toward HEDGE token buybacks. This mechanism:

• Creates consistent buying pressure for HEDGE tokens

• Rewards HEDGE holders through token appreciation

• Aligns platform success with token value

• Builds a sustainable tokenomics model

The buyback program ensures that as trading volume and profitability increase on Ostium, HEDGE token holders directly benefit from the platform's growth.

Fee Calculation Example

Trade Parameters:

• Collateral: $100

• Leverage: 50×

• Position Size: $5,000

Total Trading Costs

Asset Class	Opening Fee	Closing Fee (Loss)	Closing Fee (Win)	Total Cost (Loss)	Total Cost (Win)
Crypto	$5.00	$0.00	$1.50	$5.00	$6.50
Indices	$2.50	$0.00	$1.50	$2.50	$4.00
Forex	$1.50	$0.00	$1.50	$1.50	$3.00
Stocks	$5.00	$0.00	$1.50	$5.00	$6.50

Additional Fees

Funding Rates (Crypto Only)

Applied exclusively to crypto pairs to manage open interest imbalances:

• Compensates for OI imbalances between long and short positions

• Incentivizes market rebalancing

• Zero-sum transfer between traders

• Accrues continuously and compounds per block

• Realized upon position close

Rollover Fees (Non-Crypto Only)

Applied to forex, indices, and stocks to reflect carrying costs:

• Charges both long and short positions equally

• Non-zero-sum (revenue for protocol)

• Compounds per block

• Realized upon position close

• Covers the cost of maintaining positions over time

Liquidation Fees

When positions are liquidated:

• Trader's remaining collateral becomes liquidation reward

• Paid to Market Making Vault liquidity providers

• No separate liquidation fee charged

• Serves as effective liquidation penalty

Pricing & Execution

• No Artificial Spreads: All executions use top-of-book pricing from underlying markets

• Transparent Pricing: Real-time market prices without markup

• Fair Execution: No price manipulation or hidden costs

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Key Benefits

✅ Profit-aligned fee structure - Only pay platform fees on winning trades

✅ No closing fees on losing trades - Reduced barrier to trading

✅ Transparent, predictable costs - Clear fee schedule with no hidden charges

✅ Competitive rates - Market-leading fees across all asset classes

✅ HEDGE token buybacks - Platform success directly benefits token holders

✅ No artificial spreads - Fair market pricing without markup