Introduction

Welcome to the BigONE Developer API — a comprehensive suite of REST APIs for integrating BigONE's trading services into your applications.

API Services

BigONE provides four main API services:

Service	Description	Base URL
Spot Trading	Order Management, Market Data, Account Balance	https://api.big.one/api/v3
Wallet	Deposits, withdrawals, transfers	https://api.big.one/api/v3
Convert	Instant asset conversion (flash swap)	https://api.big.one/sapi/v1/convert
Contract	Contract and derivatives trading	https://api.big.one/api/contract/v2

Key Features

• RESTful Design: Clean, predictable API endpoints following standard HTTP conventions
• JWT Authentication: Secure token-based authentication for private endpoints
• Real-time Data: WebSocket streams for market data and order updates
• Comprehensive Market Data: Asset pairs, tickers, order books, trades, and candles

Getting Started

New to the BigONE API? Follow this path:

1. Getting Started — Learn the basics in 5 minutes
2. API Key Setup — Create your API credentials
3. Authentication — Implement JWT authentication
4. General Information — Understand rate limits and response formats

Quick Example

Here's a simple example to fetch the current BTC-USDT ticker:

curl "https://api.big.one/api/v3/asset_pairs/BTC-USDT/ticker"

# Response
{
  "code": 0,
  "data": {
    "asset_pair_name": "BTC-USDT",
    "bid": {
      "price": "87811.79",
      "order_count": 1,
      "quantity": "0.001429"
    },
    "ask": {
      "price": "87820.58",
      "order_count": 1,
      "quantity": "0.001844"
    },
    "open": "87968.1",
    "high": "90349.99",
    "low": "86818.2",
    "close": "87792.67",
    "volume": "2175.974168",
    "daily_change": "-175.43"
  }
}

Support

If you encounter issues while using the API:

• Telegram Group: Join @bigapi for real-time support and community discussions
• Documentation: Browse the API Reference for detailed endpoint documentation
• Error Codes: See Error Codes for troubleshooting

Best Practice

Place your servers in Hong Kong or Tokyo regions for the most stable connection and lowest latency to BigONE's API infrastructure.