“No slippage broker” is one of the most common things Forex traders search for. The honest answer is that no broker can truly remove slippage — but you can price-protect your orders so they never fill at a worse price than you set. This page explains why a true no-slippage broker does not exist, and how FIX API trading with Limit IOC and Limit FOK orders lets you control slippage in practice.
クイックアンサー： No broker can genuinely remove slippage, because slippage comes from price movement and available liquidity, not only from the broker. What you can do is price-protect each order. With a direct FIX API connection and Limit IOC or Limit FOK order types, an order fills at your chosen price or better, or it is rejected as a requote instead of filling worse. In effect this is instant execution with possible requotes: you trade the certainty of a fill for certainty of price, which removes negative slippage on the orders that do fill. It works well for latency-sensitive and HFT strategies, and FIX API Terminal supports exactly this.
Is There Really a No Slippage Forex Broker?
Slippage is the difference between the price you expected and the price your order actually filled at. It happens because the market can move in the milliseconds between sending an order and its execution, and because there is only so much liquidity available at each price level. None of that is something a broker can simply switch off. A broker that advertises “zero slippage” is usually either running a dealing-desk model where it sets the fill itself, or overpromising. The realistic goal is not a magic no-slippage broker, but control over whether your order is ever allowed to fill at a worse price.
What Actually Causes Slippage?
A few factors drive slippage: price movement and volatility, especially around news; latency, which widens the window in which the price can move before your order arrives; and liquidity, since a large order may have to fill across several price levels. A plain market order accepts whatever price is available when it arrives, so it is the most exposed to slippage. This is the behaviour traders are really trying to escape when they look for a “no slippage broker”.
How to Get Effectively No Negative Slippage: Limit IOC and FOK
The practical way to stop negative slippage is to stop using unprotected market orders and send price-bounded orders instead. FIX API trading supports two execution conditions that do this:
FOK（全部または一部拒否）注文. The order must fill in full at your specified price or better, immediately, or be cancelled entirely. If the market has moved away, you get a rejection — a requote — rather than a fill at a worse price.
IOC（即時またはキャンセル）. The order fills as much as possible at your price or better, immediately, and cancels any remainder. You still never fill worse than your set price.
The net effect is the same: you never fill below the price you chose. You trade the certainty of execution for certainty of price. The cost is the occasional non-fill, which shows up as a requote when the market has moved. That is the honest version of “no slippage”: not zero slippage by magic, but price-protected execution where a bad fill is replaced by a requote.
Why This Works Well for HFT Strategies
For high-frequency and latency-sensitive strategies, precise entry price usually matters more than filling every single order. Negative slippage is a silent cost that erodes a high-frequency edge over thousands of trades, so price-protected Limit IOC and FOK orders are a good fit: when an order is rejected, the strategy simply re-sends on the next signal. In other words, instant execution with possible requotes is an acceptable, often preferable, trade for an HFT system, because it protects the price the model was built around.
Direct FIX API Execution and Low Latency Also Help
Price-protected orders are the main tool, but the connection matters too. A direct FIX API link to the broker removes a standard retail platform layer, and lower latency shrinks the window in which the price can move before your order is processed. Deeper broker liquidity reduces the chance that a large order has to walk through several price levels. Together these make price-protected execution land cleanly more often.
How FIX API Terminal Helps You Control Slippage
FIX API Terminal lets you send Limit IOC and Limit FOK orders directly over a FIX API connection, so every manual order can be price-protected. It can also convert the market orders generated by an MQL robot into Limit IOC or Limit FOK orders, in fully automated mode and without changing the robot’s code — so even an automated or HFT strategy gets price-protected execution. FIX API Terminal works with brokers that provide genuine FIX API account connectivity, which is what makes this level of control possible.
Realistic Expectations
Price-protecting your orders removes negative slippage on the orders that fill, but it cannot bend the market: when price moves away, you get a requote instead of a fill, and a true zero-slippage promise does not exist. Choosing a broker with real FIX API connectivity and good liquidity, and using Limit IOC or FOK orders, is the closest thing to a “no slippage” setup that holds up in live trading. Trading always involves risk.
よくある質問
スリッページのないFXブローカーはありますか？
ブローカーは、価格変動と利用可能な流動性から発生するため、スリッページを真に除去することはできません。できることは、注文に価格保護を適用することです。リミットIOCまたはリミットFOKを使用すると、注文は指定した価格またはそれ以上の価格で約定されるか、それより悪い価格で約定される代わりに、リクオートとして拒否されます。.
FIX APIでスリッページをなくすことはできますか？
FIX APIは市場のスリッページをなくすわけではありませんが、FIX API経由で送信されるLimit IOCおよびLimit FOK注文は、約定した注文のネガティブスリッページをなくします。つまり、指定した価格を下回って約定することはありません。ただし、価格が変動した場合には、リクオテーションが発生する可能性があります。.
リクオートとは何ですか、そしてそれは悪いことですか？
リクオートとは、価格保護された注文が指定した価格で約定できない場合に発生する拒否のことです。価格に敏感な戦略やHFT戦略では、悪化する約定よりもリクオートの方が望ましい場合が多いです。なぜなら、ネガティブスリッページを被る代わりに、次のシグナルで注文を再送信できるからです。.
HFT（高頻度取引）では、IOC（Immediate Or Cancel）注文とFOK（Fill Or Kill）注文は機能しますか？
はい。高頻度取引戦略では、注文をすべて約定させることよりも正確な約定価格を重視することが多いため、価格保護されたIOC（Immediate-or-Cancel）およびFOK（Fill-or-Kill）注文が適しています。スリッページを受け入れるのではなく、拒否された注文は次の機会に再送信されます。.
Does FIX API Terminal support no-slippage style execution?
FIX API Terminal supports price-protected Limit IOC and Limit FOK orders over a direct FIX API connection, and can convert an MQL robot’s market orders into these protected order types without changing the robot’s code.
Why do some brokers advertise zero slippage?
Brokers that advertise zero slippage usually use a dealing-desk model where they set the fill themselves, or they are overstating the case. Understanding the trade-offs of execution type matters more than the marketing claim.
結論
There is no true no-slippage Forex broker, but there is a realistic way to control slippage: send price-protected Limit IOC or Limit FOK orders over a direct FIX API connection, accept the occasional requote, and keep negative slippage off the orders that fill. FIX API Terminal is built to do exactly that, for both manual and automated trading.