price_change Message

<div style={{backgroundColor: '#fff3cd', border: '1px solid #ffeaa7', borderRadius: '4px', padding: '12px', marginBottom: '16px'}}> <strong>⚠️ Breaking Change Notice:</strong> The price_change message schema will be updated on September 15, 2025 at 11 PM UTC. Please see the migration guide for details.

Emitted When:

• A new order is placed
• An order is cancelled

Structure

Name	Type	Description
event_type	string	"price_change"
market	string	condition ID of market
price_changes	PriceChange[]	array of price change objects
timestamp	string	unix timestamp in milliseconds

Where a PriceChange object is of the form:

Name	Type	Description
asset_id	string	asset ID (token ID)
price	string	price level affected
size	string	new aggregate size for price level
side	string	"BUY" or "SELL"
hash	string	hash of the order
best_bid	string	current best bid price
best_ask	string	current best ask price

{
    "market": "0x5f65177b394277fd294cd75650044e32ba009a95022d88a0c1d565897d72f8f1",
    "price_changes": [
        {
            "asset_id": "71321045679252212594626385532706912750332728571942532289631379312455583992563",
            "price": "0.5",
            "size": "200",
            "side": "BUY",
            "hash": "56621a121a47ed9333273e21c83b660cff37ae50",
            "best_bid": "0.5",
            "best_ask": "1"
        },
        {
            "asset_id": "52114319501245915516055106046884209969926127482827954674443846427813813222426",
            "price": "0.5",
            "size": "200",
            "side": "SELL",
            "hash": "1895759e4df7a796bf4f1c5a5950b748306923e2",
            "best_bid": "0",
            "best_ask": "0.5"
        }
    ],
    "timestamp": "1757908892351",
    "event_type": "price_change"
}