Ethereum Futures how to set "FOK" order types? (Instant Execution)

Understanding FOK Orders in Ethereum Futures Trading

1. FOK stands for Fill or Kill, a time-in-force instruction that mandates the entire order be executed immediately upon submission or canceled entirely if no matching liquidity exists.

2. Unlike limit or market orders, FOK eliminates partial fills and guarantees either full execution or zero execution—no intermediate state is permitted.

3. In Ethereum futures markets, FOK orders are especially relevant during high-volatility periods when traders seek certainty of entry or exit without slippage exposure.

4. Exchanges supporting FOK for ETH perpetual or quarterly futures include Binance Futures, Bybit, and OKX—each implementing slight variations in API parameters and UI labeling.

5. The order’s price must align precisely with available counterparty bids or asks; even a one-tick deviation results in automatic cancellation.

Step-by-Step Configuration on Major Platforms

1. On Binance Futures, users navigate to the trading interface, select “Advanced” order mode, choose “FOK” from the Time in Force dropdown, then input price and quantity before clicking “Buy/Sell.”

2. Bybit displays FOK under “Order Type” as a separate option alongside Market, Limit, and Stop orders; users must ensure “Reduce-Only” and “Post-Only” flags are disabled unless explicitly required.

3. OKX requires enabling “Advanced Order” toggle, selecting “FOK” from the TIF menu, and confirming that leverage settings and margin mode (cross/isolated) are pre-configured before submission.

4. API users set timeInForce: 'FOK' in the POST /api/v5/asset/balance request body while specifying ordType: 'limit' or ordType: 'market', depending on exchange support.

5. Some platforms restrict FOK to specific contract types—ETH-USDT perpetuals may allow it, whereas ETH-USD inverse futures might not, due to settlement mechanics and liquidity depth.

Risk Considerations When Using FOK

1. A FOK order submitted during low liquidity windows often fails silently, leading to missed opportunities without warning or retry logic.

2. Price impact becomes amplified if the requested size exceeds top-of-book depth; exchanges do not attempt to sweep multiple price levels for fulfillment.

3. Slippage protection is inherent but comes at the cost of reliability—traders forfeit flexibility in exchange for precision.

4. Repeated failed FOK submissions may trigger rate-limiting on certain APIs, particularly when bundled with rapid-fire requests across multiple symbols.

5. Margin checks occur pre-submission; insufficient available balance causes immediate rejection rather than queueing.

Common Misconfigurations and Fixes

1. Selecting “GTC” (Good Til Cancelled) instead of “FOK” in the TIF field leads to persistent open orders that contradict instant-execution intent.

2. Entering a limit price outside the current bid-ask spread guarantees cancellation—verify real-time order book depth before submission.

3. Using FOK with stop-market triggers creates undefined behavior on most platforms; stop orders inherently require time-based evaluation incompatible with FOK semantics.

4. Forgetting to enable isolated margin mode when targeting specific position sizes can result in insufficient margin error despite adequate wallet balance.

5. Confusing FOK with IOC (Immediate or Cancel) is frequent; IOC permits partial fills while FOK does not—a critical distinction affecting trade outcome predictability.

Frequently Asked Questions

Q: Does FOK work with ETH options futures on Deribit?A: No. Deribit only supports GTC, IOC, and Post-Only order types for ETH options; FOK is unavailable across all option contracts.

Q: Can I place a FOK order with zero price offset on a market order?A: Yes. On exchanges like Bybit, setting ordType: 'market' with timeInForce: 'FOK' executes at best available price, provided full size is covered instantly.

Q: What happens if my FOK order matches against multiple counterparties simultaneously?A: Execution proceeds atomically—the system aggregates matching liquidity across all visible orders at the specified price level and confirms full fill or cancels all matches collectively.

Q: Is FOK supported for ETH/USDC perpetuals on BitMEX?A: BitMEX discontinued ETH/USDC perpetuals in Q3 2023 and does not offer FOK on any remaining ETH instruments; legacy ETH/USD swaps only accept GTC and IOC.