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Trading fees decrease automatically as your 30-day volume grows. The on-chain window is the current UTC day plus the previous 30, so up to 31 calendar days. Maker fees drop to zero at higher tiers, rewarding users who provide liquidity. Perps and spot share one fee tier. Your tier comes from a single weighted volume figure that combines both products, so trading spot lowers your perps fees and trading perps lowers your spot fees.

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Weighted 30-Day Volume

Spot notional counts 4x toward your tier. Spot generates more fees per dollar of notional and carries no leverage, so a dollar of spot volume earns more tier credit than a dollar of perps volume.

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Fee Schedule

One tier ladder, two rate sets. Your weighted volume sets the tier, and the tier sets both your perps rates and your spot rates. For example, $600K of perps notional and $150K of spot notional over the last 30 days is a weighted volume of $600K + 4 × $150K = $1.2M, which is tier 1 — 0.040% taker on perps and 0.060% taker on spot.
Fee rates and the spot volume weight can be adjusted on-chain. For the rates currently applied to your account, along with your tier and 30-day volume history, call GET /api/v1/user_fee_rates.
There is currently no referral-based fee discount: signing up with a referral code does not change what you pay. Referral rewards are Amps from a dedicated emission pool, and affiliate rewards are an amount equivalent to a share of Decibel’s own fee revenue; neither is added to your fees. See the Referral Program and Affiliate Program.

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Maker vs Taker

A limit order that rests on the book before being filled is a maker order. A market order or limit order that fills immediately is a taker order.

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Fee Calculation

Fees are calculated as a percentage of the notional value of your trade:

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Which Asset Pays the Fee

Perps always charge fees in USDC, the collateral asset. Spot charges each side in the asset it receives, deducted from the amount that lands in your account: For example, buying BTC in a BTC/USDC spot market means your fee is deducted in BTC. In the API, spot trade rows report this as fee_asset alongside fee_amount.

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Builder Codes

Apps and trading tools can include a Builder Code in transactions to earn a portion of trading fees. If you’re using a third-party interface or bot, a Builder Code fee may be included. For details on Builder Codes, see the Builder Codes guide.

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Funding Fees

Funding isn’t technically a fee but a payment between traders. Longs pay shorts (or vice versa) based on the funding rate. For details, see Funding Rates.

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Vault Fees

If you contribute to a vault, the vault manager may charge interval-based performance fees of 0–10%. Fees are crystallized at the end of each interval (30–365 days, set by the manager at vault creation). The manager only earns fees on intervals where the vault profited — if the vault loses money in an interval, no fees are charged for that period. See Vaults for details.

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Deposit and Withdrawal

There are no protocol fees on deposits or withdrawals. You also do not pay network gas. Decibel sponsors the gas on transactions submitted through the app — including deposits, withdrawals, and trades — so you never need to hold APT to move funds or trade.
A few wallet types sign and submit their own transactions and therefore pay their own gas, including Petra Vault and some MPC wallets. If you are building your own integration rather than using the Decibel app, see Gas Station Setup for sponsoring gas for your own users.