Short answer: A post-only order in crypto futures is a limit order that guarantees you’ll add liquidity to the order book — and it gets canceled automatically if it would trade immediately as a taker.
If you’ve ever placed a limit order on Binance, Bybit, or Deribit and watched it fill instantly, you’ve likely acted as a taker without meaning to. Post-only orders solve that. They’re a critical tool for high-volume traders, scalpers, and anyone trying to keep fees low. Understanding how they work — and when to use them — can save you significant money over time.
Key Takeaways
- Post-only orders never take liquidity — they only add to the order book, which means you generally pay lower fees (maker fees) instead of higher taker fees.
- If your limit order would match an existing order on the book, the post-only flag cancels the order instead of executing it as a taker.
- These orders are best for traders who want to avoid unpredictable fills and prefer to wait for the market to come to their price.
How Does a Post-Only Order Actually Work?
Let’s break down the mechanics. When you place any limit order on a crypto futures exchange, the exchange checks if there’s an existing order at your price. If there is, your order matches with it, and you become the taker — you’re taking liquidity off the book. If there’s no match, your order sits on the book, and you’re the maker — you’re providing liquidity.
A post-only order flips that logic. You set your limit price, and the exchange checks: “If this order would execute immediately, cancel it.” That’s it. The order only posts if it adds to the order book. If it would fill right away, it gets rejected or canceled back to you.
So why does this matter? Because maker fees are typically lower than taker fees. On Binance Futures, for example, maker fees can be 0.02% while taker fees sit at 0.04%. For a trader moving 100,000 USDT in volume daily, that 0.02% difference adds up to 20 USDT per day — or about 600 USDT per month. Over a year, that’s over 7,000 USDT in savings.
What’s the Difference Between Maker and Taker Fees?
Every crypto futures exchange uses a maker-taker fee model. The maker is the order that sits on the book and provides liquidity. The taker is the order that removes that liquidity by matching immediately.
Think of it like a marketplace. You’re a maker if you put your goods on the shelf and wait for a buyer. You’re a taker if you walk up to the shelf and buy what’s already there. The exchange rewards makers with lower fees to encourage them to keep the book full — more orders mean tighter spreads and better pricing for everyone.
Post-only orders ensure you always act as the maker. But there’s a catch: you might not get filled at all if the market never reaches your price. That’s the trade-off. You’re not chasing price; you’re waiting for it to come to you.
When Should You Use a Post-Only Order?
Post-only orders shine in specific scenarios. First, if you’re a scalper or day trader who relies on tight spreads, you want to be the maker. You’re placing limit orders slightly below or above the current price, and you’re fine waiting seconds or minutes for a fill.
Second, if you’re running algorithmic or automated trading strategies, post-only orders help you avoid slippage and unpredictable fills. A bot can place a post-only order, and if it doesn’t fill, the bot knows the order is still waiting — no surprises.
Third, if you’re trading large size and don’t want to move the market, post-only orders let you add liquidity without spooking other traders. A big market order can cause slippage; a post-only limit order won’t.
But here’s what most people miss: post-only orders are not for every situation. If you need to enter or exit a position quickly — say, during a volatile news event — a post-only order will likely get canceled because the spread is too wide or the order book is thin. In those moments, you’re better off using a regular limit or market order.
What Happens When a Post-Only Order Gets Canceled?
This is the most common frustration. You place a post-only order, and it disappears instantly. Why? Because your limit price matched an existing order on the book. The exchange saw that and said, “Nope, this would be a taker fill,” and canceled it.
Let’s say Bitcoin is trading at 60,000 USDT. You place a post-only buy order at 59,990 USDT. If there’s already a sell order sitting at 59,990 USDT, your buy order would match it immediately — so the exchange cancels your order. You never get filled.
To avoid this, you need to place your order at a price that doesn’t match an existing order. That usually means going slightly below the best bid for buys, or slightly above the best ask for sells. You’re essentially adding to the book, not taking from it.
Some exchanges show you the exact price levels where post-only orders can be placed without being canceled. Others just silently reject them. Always check your order history to confirm.
Post-Only vs. Reduce-Only vs. IOC vs. FOK: What’s the Difference?
These order types get mixed up constantly. Let’s clarify:
- Post-only: Only adds liquidity. Canceled if it would take. Used for fee savings and controlled entries.
- Reduce-only: Only closes or reduces an existing position. Never opens a new one. Used for risk management and stop-losses.
- IOC (Immediate-or-Cancel): Fills as much as possible immediately, then cancels the rest. Used for quick partial fills.
- FOK (Fill-or-Kill): Must fill the entire order immediately or it’s fully canceled. Used for large exact-size entries.
Post-only and reduce-only can be combined on some exchanges. That’s a powerful combo: you add liquidity while only reducing your position, never increasing it. But not all platforms support this, so check your exchange’s documentation.
What Most People Get Wrong
First, many traders think post-only orders are just “limit orders with a flag.” They’re not. A regular limit order can execute as a taker if it matches immediately. A post-only order explicitly prevents that. It’s a fundamental behavioral difference.
Second, some believe post-only orders guarantee a fill eventually. They don’t. If the market never reaches your price, your order sits there — or gets canceled if the exchange has order lifetime limits. You might wait hours and get nothing.
Third, there’s a myth that post-only orders are only for advanced traders. That’s not true. Even a beginner can benefit from lower fees. If you’re placing limit orders anyway, just enable the post-only flag and save money. It’s that simple.
Key Risks and Pitfalls
The biggest risk with post-only orders is missed opportunities. If you need to get into a trade fast — say, during a breakout or a flash crash — a post-only order will likely get canceled. You could watch the price run away while your order keeps failing. That’s frustrating and costly.
Another pitfall: some exchanges treat post-only orders differently during high volatility or maintenance periods. Your order might get canceled for reasons beyond your control. Always have a backup plan — like a regular limit order or a market order — for urgent situations.
Finally, be aware of hidden fees. Some exchanges have tiered fee structures where maker fees can still be significant if your volume is low. Post-only orders don’t make you immune to fees; they just put you in the lower fee bracket. Always read the fee schedule for your account level.
This content is for educational and informational purposes only and does not constitute financial advice. Past performance and fee structures may change. Always verify current fees on your exchange.
Our Take
From our research and analysis, we believe post-only orders are one of the most underused tools in crypto futures trading. The fee savings alone can be substantial, especially for active traders. But they’re not a magic bullet. You need to understand the mechanics — and accept that you might miss fills during fast markets.
If you’re already using limit orders, adding the post-only flag takes two seconds and costs nothing. Try it on a small trade first. See how it behaves. You’ll quickly understand when it works and when it doesn’t. And if you’re new to futures, Bitget Futures: How to Calculate Liquidation Price is a good place to start before diving into advanced order types.
Sources & References
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