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Concept: Maker vs Taker Fee Structure

One of the greatest competitive advantages of Revolut X is its fee schedule:

Execution Type Fee Rate Description
Maker 0.00 % Order adds liquidity to the order book (Limit order resting in the book).
Taker 0.09 % Order takes liquidity from the order book (Market order or immediate limit match).

For systematic or automated trading strategies, the difference between 0.00% and 0.09% represents substantial compound fee savings over time.

The post_only Protection

When submitting standard limit orders, volatile market movements may cause the order to match immediately with an existing order. In that scenario, the exchange would classify it as a Taker and charge 0.09%.

The post_only = true flag: - Guarantees the order enters the order book strictly as a Maker. - If the order would match immediately upon placement, the exchange automatically cancels/rejects it without charging any fees.

Dynamic Maker Price Calculation

The SDK's MakerOrderStrategy evaluates live order book depth and calculates an optimal limit price with a configurable safety offset:

  • For BUY orders: $$\text{price} = \text{best_bid} - \text{offset}$$
  • For SELL orders: $$\text{price} = \text{best_ask} + \text{offset}$$

The calculated price is then quantized to the market's required minimum price increment (tick_size).

Code Example

use RevolutX\Client;
use RevolutX\Types\OrderSide;

$client = new Client(apiKey: '...', privateKeyPath: 'keys/private.pem');

// Automatically fetches the live book, applies 0.10 EUR offset, and submits post_only=true
$order = $client->placeMakerOrder(
    symbol: 'BTC-EUR',
    side: OrderSide::BUY,
    quoteSize: '50.00',
    offset: '0.10'
);