Get Last Trades (WebSocket)

Retrieve the most recent trade execution history (fills) from Synthetix's orderbook across all users through the WebSocket connection. Each trade represents a filled order or partial fill that has been executed. This endpoint provides public market data without requiring authentication.

Endpoint

ws.send() wss://api.synthetix.io/v1/ws/info

Request

Request Format

{
  "id": "trades-1",
  "method": "post",
  "params": {
    "action": "getLastTrades",
    "symbol": "BTC-USDT",
    "limit": 100
  }
}

Request Parameters

Response

Success Response

{
  "id": "trades-1",
  "status": 200,
  "result": {
    "response": {
      "trades": [
        {
          "tradeId": "123456789",
          "symbol": "BTC-USDT",
          "side": "buy",
          "price": "50000.50",
          "quantity": "0.1",
          "timestamp": 1704067200500,
          "isMaker": false
        },
        {
          "tradeId": "123456788",
          "symbol": "BTC-USDT",
          "side": "sell",
          "price": "50000.25",
          "quantity": "0.05",
          "timestamp": 1704067199800,
          "isMaker": true
        }
      ]
    },
    "status": "success"
  }
}

Response Fields

Trade Object (Public)

Error Response

{
  "id": "trades-1",
  "status": 400,
  "result": null,
  "error": {
    "code": 400,
    "message": "Invalid symbol"
  }
}

WebSocket Connection Example

const ws = new WebSocket('wss://papi.synthetix.io/v1/ws/info');
 
ws.onopen = () => {
  // Request recent trades for BTC-USDT
  ws.send(JSON.stringify({
    id: 'trades-1',
    method: 'post',
    params: {
      action: 'getLastTrades',
      symbol: 'BTC-USDT',
      limit: 50
    }
  }));
};
 
ws.onmessage = (event) => {
  const response = JSON.parse(event.data);
 
  if (response.id === 'trades-1' && response.status === 200) {
    const data = response.result.response;
    console.log('Last Trades:', data);
    // Process trade data
    data.trades.forEach(trade => {
      console.log(`${trade.side} ${trade.quantity} @ ${trade.price}`);
    });
  }
};

Examples

Get Recent Trades with Custom Limit

{
  "id": "trades-custom",
  "method": "post",
  "params": {
    "action": "getLastTrades",
    "symbol": "BTC-USDT",
    "limit": 25
  }
}

Filter by Symbol

{
  "id": "trades-eth",
  "method": "post",
  "params": {
    "action": "getLastTrades",
    "symbol": "ETH-USDT",
    "limit": 100
  }
}

Maximum Results

{
  "id": "trades-max",
  "method": "post",
  "params": {
    "action": "getLastTrades",
    "symbol": "BTC-USDT",
    "limit": 100
  }
}

Implementation Notes

• Public Data: No authentication required for this endpoint
• Symbol Required: A valid market symbol must be provided
• Limit Usage: Default limit is 50 trades, maximum 100 trades per request
• Sorting: Trades are returned in descending order by timestamp (newest first)
• Caching: Trade data is immutable once created, suitable for short-term caching
• Real-time Updates: For continuous updates, consider using WebSocket subscriptions for live trade streams

Use Cases

Market Analysis

• Recent price discovery and trade flow analysis
• Volume and liquidity assessment
• Market depth analysis when combined with orderbook data

Trading Interfaces

• Displaying recent market activity
• Trade history components
• Price movement indicators

Data Feeds

• Building market data aggregators
• Feeding external analytics systems
• Creating public market displays

Differences from getTrades

Performance Considerations

• Low Latency: WebSocket connection provides faster response times than REST
• Persistent Connection: Reuse the same connection for multiple requests
• Efficient Updates: Combine with orderbook subscriptions for complete market view
• Bandwidth: Filter by symbol to reduce data transfer

Validation Rules

• No authentication required (public Info WebSocket)
• No rate limiting beyond standard API limits
• Symbol parameter is required and must be a valid market symbol
• Limit must be between 1 and 100 (defaults to 50 if not specified)

Related Endpoints

• Orderbook Updates - Real-time orderbook changes
• Market Price Updates - Live price feeds
• REST Alternative - HTTP request for last trades