Introducing Auto Slippage: Making The OKX DEX API Smarter

Months into the bull market have brought with it new highs in prices but also in trading volume. Millions of trades are happening daily on DEXs, and if you're building trading interfaces or DEX aggregators, you're probably dealing with a flood of support tickets regarding transactions.

The Problem

Whether you're an established DEX or building a new trading interface, you've likely tried:

• The tradeoff between safe, default product settings and missed trading opportunities
• Traders struggling to understand and adjust slippage settings
• Time spent fine-tuning parameters as market conditions change

Let's solve this properly.

A Better Way

We've added automatic slippage calculation to our DEX API. By analyzing real-time market data, the API calculates optimal slippage values within your platform's preferred parameters.

Parameters

• autoSlippage (Boolean)

  • Enables automatic slippage calculation
  • Default: false
  • When true, API calculates optimal slippage based on current market data

• slippage (String)

  • The standard slippage parameter
  • Used as fallback when autoSlippage is disabled
  • Example: "0.1"

• maxAutoSlippageBps (String)

  • Sets the upper limit for automatic slippage calculations
  • Only applies when autoSlippage is true
  • Recommended for risk management
  • Example: "150" (1.5%)

Example Integration

Here's a code snippet of a swap data request for from ETH to USDT with automatic slippage:

const params = {
    // Chain and token parameters
    chainId: '1',                // Ethereum mainnet
    amount: '10000000000000000000', // 10 ETH
    fromTokenAddress: '0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE', // Native ETH
    toTokenAddress: '0xdAC17F958D2ee523a2206206994597C13D831ec7', // USDT
      userWalletAddress: "0x9163756d2a83a334de2cc0c3aa1df9a5fc21369d",
    // Slippage settings
    slippage: '0.1',            // Default slippage
    autoSlippage: true,         // Enable dynamic optimization
    maxAutoSlippageBps: "150"   // Maximum allowed slippage (1.5%)
};

See our API documentation for the complete list of parameters.

The API returns:

{
...
  "slippage": "0.005",
}

What This Means For Your Product

• Give your traders the confidence of dynamic slippage optimization, backed by real-time market data
• Focus on building features that matter while the API handles complex slippage calculations
• Users may still set slippage limit with maxAutoSlippageBps
• Simplify your trading interface without sacrificing sophistication

Try It Yourself

Prerequisites

• Node v20.17.0 or higher
• git
• a Web3 wallet (e.g., OKX Wallet Extension) for API key generation

Setup

1. Clone the repository:

git clone https://github.com/okx/dex-api-library.git
cd dex-api-library

1. Install dependencies:

npm install

1. Obtain your project ID, API key, secret key, and passphrase from the OKX Developer Portal

2. Create .env file:
   

OKX_PROJECT_ID=YOUR_PROJECT_ID
OKX_API_KEY=YOUR_API_KEY
OKX_SECRET_KEY=YOUR_API_SECRET_KEY
OKX_API_PASSPHRASE=YOUR_API_PASSPHRASE

1. Run the example:

npm run swap-data:solana

You should see the auto-calculated slippage value along with the quote details!

Looking Forward

Check the docs for full implementation details and hit us up @OKXDevs if you have any questions.

---

Found this helpful? Don't forget to check out the boilerplate code and documentation linked above. Building something interesting with this? We'd love to hear about it. Join the OKX OS Community to connect with other developers, and follow Julian on Twitter for more developer content!

---

This content is provided for informational purposes only and may cover products that are not available in your region. It represents the views of the author(s) and it does not represent the views of OKX. It is not intended to provide (i) investment advice or an investment recommendation; (ii) an offer or solicitation to buy, sell, or hold digital assets, or (iii) financial, accounting, legal, or tax advice. Digital asset holdings, including stablecoins and NFTs, involve a high degree of risk and can fluctuate greatly. You should carefully consider whether trading or holding digital assets is suitable for you in light of your financial condition. Please consult your legal/tax/investment professional for questions about your specific circumstances. Information (including market data and statistical information, if any) appearing in this post is for general information purposes only. While all reasonable care has been taken in preparing this data and graphs, no responsibility or liability is accepted for any errors of fact or omission expressed herein. Both OKX Web3 Wallet and OKX NFT Marketplace are subject to separate terms of service at www.okx.com.

© 2025 OKX. This article may be reproduced or distributed in its entirety, or excerpts of 100 words or less of this article may be used, provided such use is non-commercial. Any reproduction or distribution of the entire article must also prominently state: “This article is © 2025 OKX and is used with permission.” Permitted excerpts must cite to the name of the article and include attribution, for example “Integrate the OKX DEX Widget in Just 30 Minutes, Julian Martinez, © 2025 OKX.” No derivative works or other uses of this article are permitted.

© 2025 OKX. All rights reserved.