OKEx API: A Comprehensive Guide for Developers

Introduction to OKEx REST API

The OKEx REST API provides a powerful interface for developers to integrate cryptocurrency trading, market data, and account management functionalities into their applications. Representational State Transfer (REST) architecture offers these key advantages:

Each API endpoint represents a specific resource
Client-server communication occurs through standardized HTTP methods
Supports four primary operations: GET, POST, PUT, and DELETE
Uses JSON format for data exchange

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Getting Started with OKEx API

API Endpoints and Authentication

Base URL: https://www.okex.com/api/v1
Protocol: All requests require HTTPS
Content-Type: application/x-www-form-urlencoded

Request Workflow

Parameter Preparation: Format requests according to API specifications
Request Submission: Send via POST or GET methods
Server Response: Returns JSON data after security validation
Data Processing: Handle the response in your application

Market Data API Reference

1. Ticker Information

Endpoint: GET /api/v1/ticker.do
Frequency Limit: 20 requests/2 seconds

Parameters:

Parameter	Type	Required	Description
symbol	String	Yes	Trading pair (e.g., ltc_btc)

Response Example:

{
 "date":"1410431279",
 "ticker":{
   "buy":"33.15",
   "high":"34.15",
   "last":"33.15",
   "low":"32.05",
   "sell":"33.16",
   "vol":"10532696.39199642"
 }
}

2. Market Depth

Endpoint: GET /api/v1/depth.do
Optional Parameters:

size (1-200, default: 200)

Trading API Documentation

Account Management

User Information Endpoint:
POST /api/v1/userinfo.do
Frequency Limit: 6 requests/2 seconds

Response Includes:

Free balances
Frozen funds
Asset details

Order Placement

Trade Endpoint:
POST /api/v1/trade.do
Order Types:

Limit orders (buy/sell)
Market orders (buy_market/sell_market)

Advanced Features

Batch Processing

Place multiple orders simultaneously (max 5 per request)
Cancel up to 3 orders in a single request

Historical Data

Access complete order history (last 2 days)
Pagination support (max 200 records per page)

Fund Management API

Withdrawal Processing

Key Parameters:

Network fee ranges
Minimum withdrawal amounts
Address verification

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FAQ Section

Q: What's the rate limit for market data API?

A: 20 requests per 2 seconds for most market endpoints.

Q: How do I handle API authentication?

A: All private endpoints require:

API key
Request signature
Timestamp validation

Q: Can I test trades without real funds?

A: OKEx provides a sandbox environment for testing with virtual funds.

Q: What currencies support withdrawals?

A: BTC, LTC, ETH, ETC, and BCH with specific minimum amounts.

Q: How are fees calculated for withdrawals?

A: Network fees vary by currency and affect confirmation speed.

Best Practices for API Integration

Implement proper error handling
Use exponential backoff for rate limiting
Secure your API keys
Monitor your usage metrics