KuCoin API interface complete guide: Lao Liek teaches you how to play quantitative trading, say goodbye to manual bricks

Hey guys! Today we won’t talk about the rise and fall of the market, but let’s talk about something hard-KuCoin’s API. If you are a developer, quantitative trader, or want to build your own trading robot, API is a weapon you cannot avoid. It allows you to use codes to automatically trade and capture market data, turning those tedious manual operations into fully automatic assembly lines, saving time and effort, and avoiding emotional operations.

However, before going deep into the API, Old Leek must give you a reminder: the prerequisite for playing with the API is that you must have a reliable exchange account. There are too many pheasant platforms on the market. API permissions are given indiscriminately, and security is worrying. If not, the API key will be leaked and the assets will be reduced to zero overnight. Be sure to choose a major exchange that is ranked high in the world and has a formal license like Binance, OKX, and Bybit. Fund security is always the first priority. Don't take big risks just to save some handling fees.

Next, we will systematically dismantle KuCoin’s API system so that you can go from getting started to becoming proficient.

1. API Overview and Core Concepts

KuCoin's API is mainly divided into two major systems: Classic API and Pro API. Pro API is a new generation interface with a more modern design and better performance. Officials also recommend that new projects use it first. Although the old API can still be used, new functions may not keep up.

Quick check on key terms

REST API: Used for one-time requests, such as placing orders, checking balances, and obtaining K lines. It is suitable for scenarios that do not require real-time performance.
WebSocket: Used to push data in real time, such as market changes and order status updates. It is suitable for strategies that require low latency, such as high-frequency trading or tracking robots.
API Key / Secret: Your identity credential is equivalent to your account password. **Be sure to keep it safe and don’t leak it! ** This thing is more important than the private key. If you lose it, you will be poked.
Rate Limit: In order to prevent abuse, the exchange has limits on the frequency of API calls. Exceeding the limit will be temporarily banned, so don't be too aggressive and take it easy.

2. Detailed explanation of Pro REST API

Pro API is the main force, with clear structure and comprehensive functions. Let’s focus on it.

2.1 Market Data

These interfaces are used to obtain market information. No certification is required, and novices can easily get started.

GET /api/v1/symbols: Get the details of all trading pairs and see what coins are available for play.
GET /api/v1/market/allTickers: Get all market prices (24-hour statistics) and understand market trends with one click.
GET /api/v1/market/orderbook/level2_20: Get 20 depth order books and analyze the buying and selling pressure.
GET /api/v1/market/candles: Get K-line data and make the basis for technical analysis.
GET /api/v1/market/histories: Get recent transaction history and see market activity.

2.2 Account Management

Managing your assets and sub-accounts requires certification and involves real money. Be sure to confirm permissions before operating.

GET /api/v1/accounts: Get an account overview (UTA unified trading account) and see your financial situation at a glance.
GET /api/v1/accounts/{currency}: Get the asset details of the specified currency, such as seeing how much BTC is left.
GET /api/v1/sub-accounts: Get all sub-account information, suitable for large accounts or team management.
GET /api/v1/transfer/transfer-out-quota: Get the transfer quota, don’t exceed the limit.

2.3 Order Transaction

The core trading function, if you play it well here, you can make money automatically.

POST /api/v1/orders: Place orders, support limit price, market price and other types.
POST /api/v1/orders/multi: Batch orders, suitable for situations where the strategy needs to open multiple positions at the same time.
DELETE /api/v1/orders/{orderId}: Cancellation of orders, not fast enough? Code to help you.
DELETE /api/v1/orders: Cancel orders in batches based on trading pairs, one-click liquidation is not a dream.
GET /api/v1/orders/{orderId}: Get order details and track status in real time.
GET /api/v1/orders: Get the list of active orders and manage your unfilled orders.
GET /api/v1/fills: Get transaction history, a good helper for reviewing trading strategies.

2.4 Position Management (Contract/Leverage)

Brothers who play with contracts and leverage, please read this, the risk is high, and the API can help you stop losses automatically if you use it well.

GET /api/v1/positions: Get the position list and monitor your leverage exposure in real time.
GET /api/v1/positions/history: Get position history and analyze past trading performance.
POST /api/v1/positions/margin/auto-deposit-status: Modify the automatic margin call status of isolated position leverage to avoid liquidation.

3. Pro WebSocket real-time data

WebSocket is the eyes and ears of real-time strategy, with low latency and timely data push, suitable for markets that require quick response.

3.1 Public channel (no subscription required)

/market/candles:{symbol},{period}: K-line data push, real-time chart update.
/market/level2:{symbol}: Incremental push of order book, depth changes are clear at a glance.
/market/ticker:{symbol}: Market data push, price changes can be perceived in seconds.
/market/trade:{symbol}: Push real-time trading data to see the trend of large orders.

3.2 Private channel (requires authentication)

/spotMarket/tradeOrders: Spot orders are updated, and the status of your buy and sell orders is pushed in real time.
/account/balance: Account balance changes, fund changes are immediately known.
/margin/position: Changes in leverage positions require risk monitoring.
/contract/position: Change of contract position, necessary for playing with contracts.

4. Classic REST API (Legacy)

The Classic API is still maintained, but some new features may only be available in the Pro API. Structurally, it is divided into currency, leverage, contract and other modules. The functions are similar to the Pro API, but the endpoint paths are different. Old projects may still use it. It is recommended that new projects directly use the Pro API.

4.1 Coin-to-Coin Transaction

POST /api/v1/orders: Place an order.
GET /api/v1/orders: Query orders.
DELETE /api/v1/orders/{orderId}: Cancel order.

4.2 Leverage Trading

GET /api/v1/margin/market: Get loanable market information and see what coins can be borrowed.
POST /api/v1/margin/borrow: Borrowing coins will amplify the benefits and risks.
POST /api/v1/margin/repay: To return the coins, don’t forget to release the leverage.

4.3 Contract Trading

GET /api/v1/contracts/active: Get active contracts, it is important to choose the right one.
POST /api/v1/orders: Placing orders through contracts is about heartbeat.
GET /api/v1/position: Get the contract position and monitor the market in real time to prevent explosion.

5. Broker and Partner API

This part is for users who want to become KuCoin brokers or develop integrated platforms. It is suitable for experienced players who have a team or want to earn rebates.

Broker Plan: By inviting users to register, you can get commissions from their transaction fees. Making money while lying down is not a dream.
API functions: Including querying commissions, managing sub-users, viewing user transaction details, etc., to facilitate your offline management.
Applicable objects: Suitable for teams developing follow-up systems, trading signal robots, quantitative strategy platforms, or brothers who want to become big agents.

**If you want to apply to become an exchange agent or obtain higher rebates, you can contact us. The CoinRebate team has many years of experience and can help you connect with the agency services of major formal exchanges, helping you save worry and effort and earn commissions. **

6. Security instructions and best practices

Keep the secret secret: The API Secret is only displayed once when it is created. It must be saved offline, such as writing it in a local file or using a password manager. Do not upload to public platforms such as GitHub, otherwise you will be hacked in minutes.
Restrict permissions: When creating an API Key, only grant necessary permissions (such as read-only, transaction), follow the principle of least permissions, and do not give too many permissions to reduce risks.
Use IP whitelist: If conditions permit, set up an IP whitelist to only allow your own server to call it, so that even if the key is leaked, others cannot use it.
Pay attention to the rate limit: Arrange the request frequency reasonably to avoid being banned, especially for the market data interface, don’t be too greedy.
Official documents shall prevail: The API may be updated, always refer to KuCoin official developer documentation, do not trust third-party pheasant tutorials.

Write at the end: Where to start?

For most users, it is recommended to follow this path:

Open a good account first: Before playing with API, you must have a trading account. It is strongly recommended that you register through formal channels and use the invitation code to obtain a permanent fee discount. If you add up, you can save a lot of money. For example:

Binance: Use the referral code LULALA and register through this link to enjoy a 20% fee discount: https://www.maxweb.black/join?ref=LULALA
OKX (OUYI): Use the referral code LULALA and register through this link to enjoy a 20% handling fee discount: https://www.lywebuuz.com/join/LULALA
Bybit: Use the referral code ODXBWMN and register through this link to enjoy a 20% fee discount: https://www.bybitglobal.com/invite?ref=ODXBWMN

Start with the sandbox environment: KuCoin provides a test environment. Use virtual funds to debug your code first. Don’t make a real offer as soon as you start, as it will be easier to pay tuition.
Read first, then write: Start by calling a simple market data interface (such as getting market information), then try a read-only account interface, and finally conduct simulated transactions and small-amount real-price transactions, step by step and steadily.

API is a powerful tool that can systematize and automate your trading strategy, helping you say goodbye to the hard days of manual trading. But remember, with great tools comes great responsibility. Make sure your code is fully tested and keep an eye on market risks. Don’t let robots take you to the rooftops.

I hope this guide can help you open the door to quantitative trading! If you have any questions about exchange registration or handling fee discounts, come to CoinRebate to chat with us at any time. The old leeks are waiting for you to pick up the wool.