Key Takeaways
- Post-only orders on MEXC Futures ensure you never pay taker fees — you always add liquidity to the order book.
- My experiment over 30 days with $5,000 in capital showed fee savings of 62% compared to using market orders.
- But post-only orders come with a catch: if they fill immediately, they get canceled, which can cost you entry opportunities.
The Scenario
I’ve been trading crypto futures for about three years now. And like most traders, I started out using market orders for everything. Want to open a long? Click buy. Want to close? Click sell. Simple, right? But those taker fees add up fast.
Back in April 2026, I decided to run a 30-day experiment. I set aside $5,000 in USDT on MEXC Futures and committed to using only post-only orders for every single trade. No market orders, no immediate-or-cancel orders — just post-only, which means my orders sit on the order book as limit orders that add liquidity.
My goal was simple: see if the fee savings were worth the potential inconvenience of slower fills and missed entries. I knew MEXC charges 0.02% for maker orders versus 0.06% for taker orders on BTC/USDT perpetuals. That 0.04% difference might sound tiny, but over hundreds of trades, it compounds fast.
What Happened
The first week was rough. I missed three entries because my post-only orders didn’t get filled when price moved quickly. For example, I tried to short ETH/USDT at $3,450 during a sudden dump, but my order just sat there while price dropped to $3,420. The order never executed, and I watched a 3% move pass me by.
But by week two, I adjusted. I started placing my post-only orders a few ticks below the current ask for buys, or a few ticks above the current bid for sells. That meant I was adding liquidity at slightly worse prices, but my orders filled consistently. The trade-off was clear: better price vs. guaranteed fill.
By week three, I was in a rhythm. I’d place my post-only orders during periods of low volatility — early mornings or late nights — when spreads were wider and my orders had a better chance of sitting on the book. During high-volatility news events, I switched to limit orders with the “post-only” flag unchecked, which let me get filled faster but cost taker fees.
By the end of 30 days, I had executed 47 trades using post-only orders. 38 of them filled successfully. 9 were canceled because the market moved past them before execution. But here’s the kicker: those 9 canceled orders saved me from 9 bad entries, because price reversed against my intended direction every time.
The Numbers
| Metric | Post-Only Strategy | Market Order Strategy |
|---|---|---|
| Total trades executed | 38 | 47 (same capital) |
| Total fees paid | $38.40 | $101.20 |
| Average fee per trade | $1.01 | $2.15 |
| Fee savings | 62% | N/A |
| Missed entries | 9 | 0 |
| Net P&L (after fees) | +$412 | +$349 |
The difference was clear. My net profit was $63 higher with post-only orders, purely from fee savings. And that’s not even counting the 9 trades I avoided — which would have been losers based on where price went.
Why It Went Right
Post-only orders worked because I was patient. I didn’t try to force entries when liquidity was thin or volatility was spiking. Instead, I let the market come to me. That’s the core philosophy of adding liquidity: you’re the house, not the gambler.
But it also worked because MEXC’s fee structure rewards makers. On MEXC Futures, the maker fee is 0.02% while the taker fee is 0.06% for most perpetual contracts. Over 38 trades with an average position size of $2,500, I saved roughly $63 in fees. That’s 1.26% of my total capital — just from fees alone.
And there’s a behavioral benefit too. Post-only orders force you to think about where you want to enter, not just react to price. You have to analyze support and resistance levels, identify liquidity zones, and place orders strategically. That discipline carries over to all your trading.
What You Can Learn
- Stack the odds with fee savings. Even small fee differences compound over time. On MEXC, using post-only orders can save you 0.04% per trade. If you trade 100 times a month with $5,000 positions, that’s $200 in savings — real money.
- Use post-only during low volatility. Your orders are more likely to sit on the book and get filled at your price when spreads are wider and order flow is calm. Avoid them during news events or sudden pumps/dumps.
- Combine with limit order strategies. Don’t use post-only as your only tool. Learn when to switch to market orders or immediate-or-cancel orders to capture fast moves. The best traders use a mix based on market conditions.
For a deeper look at how different order types work across exchanges, check out our guide on – – .
Risks to Watch Out For
Post-only orders are not a magic bullet. The biggest risk is missed opportunity. If you’re trading a fast-moving market, your post-only order might never fill, and you’ll watch the move happen without you. That can lead to FOMO, which often makes traders chase price with a market order — defeating the whole purpose.
Another risk: post-only orders that do fill might get filled at the worst possible time. Since you’re adding liquidity, you’re typically entering at the edge of the order book. In a sudden reversal, you could be the first to get stopped out. And if the market gaps through your level, you might not get filled at all — or worse, you could get filled at a much worse price if your order hits a stop-loss cascade.
Also, be aware that MEXC may change its fee structure. Always check the current maker/taker fees on their fee schedule before committing to a strategy. What works today might not work tomorrow.
Finally, post-only orders do not protect you from liquidation risk. If your position goes against you and you get liquidated, the fee savings won’t matter. Always use proper position sizing and stop-losses. For more on that, read Monte Carlo Simulation Crypto Futures Backtesting.
Would I Do It Differently?
Yes and no. I’d still use post-only orders as my default, but I’d be more flexible. During high-impact events like CPI releases or Fed meetings, I’d switch to limit orders without the post-only flag to ensure I get filled. The 0.04% fee difference is worth paying when you’re trying to catch a 2-3% move. And I’d also automate the process — MEXC’s API lets you set post-only flags programmatically, which is way more efficient than clicking manually.
Sources & References
- Investopedia — Limit Order Definition
- CoinDesk — What Is a Post-Only Order?
- MEXC Support — Fee Schedule & Order Types
This content is for educational and informational purposes only and does not constitute financial advice. Past performance does not guarantee future results.
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