Overview

Opinion OpenAPI

Welcome to the official documentation for the Opinion OpenAPI - a RESTful API for accessing OPINION Prediction Markets

📊 Public Data API: This API provides read-only access to market data, orderbooks, and price information. For trading operations (placing orders, managing positions), please use the Opinion CLOB SDK.

To request API access, Please kindly fill out this short application form .

API Key can be used for Opinion OpenAPI, Opinion Websocket, and Opinion CLOB SDK

What is Opinion OpenAPI?

The Opinion OpenAPI provides a simple HTTP interface for accessing prediction market data from Opinion Labs' infrastructure. It enables developers to:

• Query market data - Access real-time market information, metadata, and trading volumes

• Monitor prices - Get latest trade prices and historical price data

• Analyze orderbooks - Retrieve order book depth for any market token

• Discover quote tokens - List available trading currencies and their configurations

Key Features

Simple Integration

• RESTful - Standard HTTP/JSON API

• OpenAPI 3.0 - Full specification with Swagger/Redoc support

• Language Agnostic - Use with any programming language

• No Dependencies - Just HTTP requests

Performance Optimized

• Low Latency - Optimized for real-time data access

• Rate Limited - 15 requests/second per API key

• Paginated - Efficient handling of large datasets

Secure Access

• API Key Authentication - Simple header-based auth

• HTTPS Only - All traffic encrypted

• Production Ready - Battle-tested infrastructure

Blockchain Support

Chain	Chain ID	Status
BNB Chain Mainnet	56	✅ Live

Use Cases

Market Analytics Dashboard

Aggregate and display market data for research or monitoring applications.

# Get all active markets sorted by 24h volume
curl -X GET "https://proxy.opinion.trade:8443/openapi/market?status=activated&sortBy=5&limit=20" \
  -H "apikey: your_api_key"

{
  "code": 0,
  "msg": "success",
  "result": {
    "total": 150,
    "list": [
      {
        "marketId": 123,
        "marketTitle": "Will BTC reach $100k by end of 2025?",
        "status": 2,
        "statusEnum": "Activated",
        "yesTokenId": "0x1234...5678",
        "noTokenId": "0x8765...4321",
        "volume": "1500000.00",
        "volume24h": "125000.00"
      }
    ]
  }
}

Price Monitoring Bot

Track real-time prices for specific outcome tokens.

# Get latest price for a token
curl -X GET "https://proxy.opinion.trade:8443/openapi/token/latest-price?token_id=0x1234...5678" \
  -H "apikey: your_api_key"

{
  "code": 0,
  "msg": "success", 
  "result": {
    "tokenId": "0x1234...5678",
    "price": "0.65",
    "side": "BUY",
    "size": "1000.00",
    "timestamp": 1733312400000
  }
}

Orderbook Analysis

Analyze market depth for trading insights.

# Get orderbook for a token
curl -X GET "https://proxy.opinion.trade:8443/openapi/token/orderbook?token_id=0x1234...5678" \
  -H "apikey: your_api_key"

{
  "code": 0,
  "msg": "success",
  "result": {
    "market": "0xabc...def",
    "tokenId": "0x1234...5678",
    "timestamp": 1733312400000,
    "bids": [
      {"price": "0.64", "size": "5000.00"},
      {"price": "0.63", "size": "12000.00"}
    ],
    "asks": [
      {"price": "0.66", "size": "3000.00"},
      {"price": "0.67", "size": "8000.00"}
    ]
  }
}

Historical Price Charts

Build price charts with historical data.

# Get daily price history for the last 30 days
curl -X GET "https://proxy.opinion.trade:8443/openapi/token/price-history?token_id=0x1234...5678&interval=1d" \
  -H "apikey: your_api_key"

{
  "code": 0,
  "msg": "success",
  "result": {
    "history": [
      {"t": 1733184000, "p": "0.58"},
      {"t": 1733270400, "p": "0.62"},
      {"t": 1733356800, "p": "0.65"}
    ]
  }
}

API Endpoints Overview

Endpoint	Method	Description
/market	GET	List all markets with filters
/market/{marketId}	GET	Get market details by ID
/token/latest-price	GET	Get latest trade price
/token/orderbook	GET	Get order book depth
/token/price-history	GET	Get historical prices
/quoteToken	GET	List quote tokens (currencies)

Authentication

All API requests require an API key passed in the apikey header:

curl -X GET "https://proxy.opinion.trade:8443/openapi/market" \
  -H "apikey: your_api_key" \
  -H "Content-Type: application/json"

📧 Get an API Key: Please kindly fill out this short application form .

Rate Limiting

Limit	Value
Requests per second	15
Max items per page	20

If you exceed rate limits, you'll receive a 429 Too Many Requests response.

Response Format

All responses follow a consistent JSON structure:

{
  "code": 0,         // 0 = success, non-zero = error
  "msg": "success",  // Human-readable message
  "result": { ... }  // Response data (varies by endpoint)
}

Error Codes

Code	Description
0	Success
400	Bad Request - Invalid parameters
401	Unauthorized - Invalid or missing API key
404	Not Found - Resource doesn't exist
429	Too Many Requests - Rate limit exceeded
500	Internal Server Error

Quick Links

Resource	Link
Python SDK	Opinion CLOB SDK

SDK vs OpenAPI

Feature	OpenAPI (This API)	CLOB SDK
Market Data	✅	✅
Orderbook	✅	✅
Price History	✅	✅
Place Orders	❌	✅
Cancel Orders	❌	✅
Manage Positions	❌	✅
On-chain Operations	❌	✅
Language	Any (HTTP)	Python

Recommendation:

• Use OPINION OpenAPI for read-only data access, dashboards, and analytics

• Use OPINION CLOB SDK for trading, order management, and blockchain interactions

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Ready to get started? Check the OpenAPI Specification for detailed endpoint documentation.