Reviewed guide | 2026-10-10
Post-only orders and maker fills: a practical test for South African traders
Many traders want their limit orders to fill as maker but are not sure their orders actually do. A small practical test South African readers can run on Binance, OKX, Bybit or Bitget to see how post-only orders behave.
Multiple exchanges | South Africa | ZAR | fees, access and account safety
If you trade often, the difference between maker and taker roles can add up over a year. Many traders therefore try to place limit orders that rest on the book rather than match immediately. Good intentions do not always survive a fast market: a limit order placed close to the price can cross the spread and fill as taker. Post-only orders are designed to prevent that, but they behave differently from ordinary limit orders and can surprise you the first time. This guide describes a simple low-cost test you can run yourself to understand how maker and taker classification and post-only orders work on the platform you use.
Set up the test with a tiny amount
Choose a liquid spot pair you already trade and decide on a very small order size. The goal is learning, not profit, so the amount should be trivial. Open the order book and note the best bid and best ask. Have the official fee page open in another tab so you can compare charges afterwards with the correct maker and taker lines for your account level.
Compare three kinds of limit orders
First, place an ordinary limit buy below the best bid and let it rest until filled; it should be maker. Second, place an ordinary limit buy above the best ask; it fills immediately as taker even though it is a limit order. Third, place a post-only buy at a price that would cross the spread and watch what happens. Depending on the platform, it is rejected or cancelled rather than filled as taker.
Read the fill details
Open the trade history and inspect each fill. Look for the maker or taker label and the fee charged. Compare these with the fee page. Note where the fee was taken from, such as the received asset or a platform token. If an order filled in parts, check whether each part had the same role. Writing down what you observed makes the behaviour stick far better than reading about it.
Decide how to use post-only in practice
Based on the test, decide when post-only suits you. It works well for patient orders where a rejected order is acceptable. It is less suitable when you need to be filled quickly. Record your conclusions in your trading notes, including how the platform reports a rejected post-only order, so you are not confused when it happens during real trading.
Risk boundary: South Africa Crypto Guide
Digital assets are volatile and derivatives can amplify losses. This website has no login, wallet connection, deposit form or customer-support chat. A referral link only records attribution; it does not guarantee access, pricing, rewards, approval or investment results. Availability can differ by residence, legal entity and product, so no regional access is assumed from language or branding alone.
Scenario checkpoint
- Run the test with a trivial order size on a liquid spot pair you already trade.
- Place a limit order above the best ask to see a limit order fill as taker.
- Place a crossing post-only order and record how the platform rejects or cancels it.
- Check each fill's maker or taker label and fee against the official fee page.
Digital assets are volatile and derivatives can amplify losses. This website has no login, wallet connection, deposit form or customer-support chat.