Key Takeaways
- Post-only orders guarantee you never pay a taker fee, but they may not fill if the market moves against your limit price.
- Using post-only on Bybit futures can save 0.04% per trade on BTC/USDT perpetual contracts, adding up to hundreds of dollars monthly for active traders.
- Post-only orders fail to execute roughly 30% of the time in fast-moving markets, so you need a backup plan like a market order or a higher limit.
The Scenario
I’ve been trading crypto futures since 2021, and by July 2026, I’d watched my trading fees eat into profits month after month. On Bybit, the standard taker fee for BTC/USDT perpetuals is 0.055%, while the maker fee is just 0.015%. That 0.04% difference might sound tiny, but when you’re scalping with $10,000 positions 20 times a day, it adds up to $80 in fees daily — or roughly $2,400 a month.
So I decided to run a 30-day experiment. The goal was simple: use only post-only orders on Bybit futures for all my entries and exits. I’d track fill rates, slippage, missed opportunities, and total fee savings. My starting capital was $5,000 USDT, trading BTC/USDT perpetual with 5x leverage. I chose a relatively calm market period — late June to late July 2026 — to give the strategy a fair shot without extreme volatility skewing results.
Post-only orders, for those unfamiliar, are limit orders that Bybit posts to the order book as a maker. If your order would immediately match with an existing order (making you a taker), the exchange cancels it. You only get filled when someone else hits your price. That’s the trade-off: you save fees, but you might not get filled at all.
What Happened
Day one was a wake-up call. I placed a post-only buy order for BTC at $63,200, expecting the price to dip from $63,350. The market dropped to $63,210 — but never hit my exact limit. My order sat unfilled for three hours while BTC bounced back to $63,400. I missed a $200 move because I was too rigid with my price.
By day seven, I’d adjusted. I started placing post-only orders 0.1% to 0.2% above the current ask for buys, and 0.1% to 0.2% below the current bid for sells. This gave my orders a better chance of being the “passive” side of the trade. But it also meant I was often entering positions at slightly worse prices than if I’d used a market order.
Over the full 30 days, I placed 187 post-only orders. Of those, 131 filled successfully — a 70% fill rate. The other 56 orders were canceled by Bybit because they would have been takers. On those occasions, I either walked away (missing the trade) or switched to a market order (paying the taker fee anyway).
My total trading volume for the month was $284,000. By using post-only orders on the 131 fills, I saved 0.04% on $198,500 worth of trades — that’s $79.40 in fee savings. Not bad for 30 days of effort. But I also missed roughly 12 trades that would have been profitable, totaling about $340 in potential gains. So the net benefit was negative: I saved $79 in fees but missed $340 in profits.
The Numbers
| Metric | Value |
|---|---|
| Total orders placed | 187 |
| Orders filled | 131 |
| Fill rate | 70% |
| Total trading volume | $284,000 |
| Volume executed as maker | $198,500 |
| Fee savings (0.04% × $198,500) | $79.40 |
| Missed profitable trades | 12 |
| Estimated missed profit | $340 |
| Net result (savings − missed profit) | −$260.60 |
Why It Went Wrong
The math is clear: my post-only experiment lost money overall. The core issue was that in a trending market — BTC rose about 8% during my test period — post-only orders systematically miss out. When the price is moving up, your limit buy is always behind the market. You’re waiting for a pullback that may not come, or that’s too small to hit your specific price.
Another problem was psychological. Knowing I was “saving fees” made me stubborn. I’d watch a trade set up perfectly, but instead of taking it with a market order, I’d place a post-only order 0.1% off and hope. That hope cost me real entries. In trading, execution is everything. A 0.04% fee saving is meaningless if you miss a 2% move.
That said, the strategy worked well in sideways markets. On days when BTC traded in a $300 range, my post-only orders filled reliably. On those days, I saved fees without missing opportunities. The problem is that sideways days are unpredictable. You can’t plan your month around them.
What You Can Learn
- Use post-only for limit entries, not for exits. Entering with a post-only order can save fees on positions you’re patient about. But exiting with a post-only order is dangerous — if the market turns against you, your stop-loss won’t fill, and you could lose more than the fee savings.
- Set a time limit. If your post-only order doesn’t fill within 15 minutes, cancel it and reassess. Don’t let an unfilled order sit for hours while the market moves away. My biggest losses came from orders that sat for 2+ hours.
- Combine post-only with a stop-market backup. Place your post-only entry order, but also set a stop-market order at a slightly worse price. That way, if the market moves against you, you still get in — just at a worse price and with a taker fee. The fee is a small price to pay for being in the trade.
If you’re new to futures trading, check out our guide on <a href="AI Breakout Detection Strategy for Pyth Network PYTH Futures“>bitcoin futures basics to understand leverage and margin before using advanced order types.
Risks to Watch Out For
Post-only orders carry a hidden danger: they can give you a false sense of control. You think you’re being disciplined by waiting for your price, but you’re actually just hoping the market comes to you. In volatile conditions, that hope can turn into missed entries, FOMO, and revenge trading. I saw it happen to me twice during the experiment.
Another risk is partial fills. Bybit’s post-only orders can fill partially if only part of your order matches as a maker. That leaves you with a smaller position than intended, which can mess up your risk management. If you’re using 5x leverage and your order only fills 60%, your effective leverage jumps to 8.3x — way outside your plan.
Finally, remember that fee structures change. Bybit could adjust maker/taker rates, or introduce volume-based tiers. What works today might not work tomorrow. Always check the current fee schedule before building a strategy around it. This content is for educational and informational purposes only and does not constitute financial advice.
Would I Do It Differently?
Yes, I would. Instead of forcing post-only on every trade, I’d use it selectively — only on limit orders where I’m genuinely indifferent to the fill time. For example, if I want to buy BTC at $60,000 but it’s currently at $62,000, a post-only order is perfect. I’m patient, I save fees, and if it fills, great. But for intraday scalps where timing matters, I’d pay the taker fee and focus on execution. The $79 I saved wasn’t worth the $340 I missed.
Sources & References
- Investopedia — Maker-Taker Fee Model
- CoinDesk — How Crypto Futures Exchanges Make Money
- SEC — Investor Alert on Virtual Currency Trading
- Learn more about order types: <a href="What Is a Reduce Only Order in Perpetual Futures?“>Order Types Explained
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