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Public channel for updates related to market updates (level 2 price data). SUBSCRIBE <wss-channel> market

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Book Message

Emitted When:
  • First subscribed to a market
  • When there is a trade that affects the book

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Structure

NameTypeDescription
event_typestring”book”
asset_idstringasset ID (token ID)
marketstringcondition ID of market
timestampstringunix timestamp the current book generation in milliseconds (1/1,000 second)
hashstringhash summary of the orderbook content
buysOrderSummary[]list of type (size, price) aggregate book levels for buys
sellsOrderSummary[]list of type (size, price) aggregate book levels for sells
Where a OrderSummary object is of the form:
NameTypeDescription
pricestringsize available at that price level
sizestringprice of the orderbook level
Response
{
  "event_type": "book",
  "asset_id": "65818619657568813474341868652308942079804919287380422192892211131408793125422",
  "market": "0xbd31dc8a20211944f6b70f31557f1001557b59905b7738480ca09bd4532f84af",
  "bids": [
    { "price": ".48", "size": "30" },
    { "price": ".49", "size": "20" },
    { "price": ".50", "size": "15" }
  ],
  "asks": [
    { "price": ".52", "size": "25" },
    { "price": ".53", "size": "60" },
    { "price": ".54", "size": "10" }
  ],
  "timestamp": "123456789000",
  "hash": "0x0...."
}

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price_change Message

⚠️ Breaking Change Notice: 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

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Structure

NameTypeDescription
event_typestring”price_change”
marketstringcondition ID of market
price_changesPriceChange[]array of price change objects
timestampstringunix timestamp in milliseconds
Where a PriceChange object is of the form:
NameTypeDescription
asset_idstringasset ID (token ID)
pricestringprice level affected
sizestringnew aggregate size for price level
sidestring”BUY” or “SELL”
hashstringhash of the order
best_bidstringcurrent best bid price
best_askstringcurrent best ask price
Response
{
    "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"
}

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tick_size_change Message

Emitted When:
  • The minimum tick size of the market changes. This happens when the book’s price reaches the limits: price > 0.96 or price < 0.04

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Structure

NameTypeDescription
event_typestring”price_change”
asset_idstringasset ID (token ID)
marketstringcondition ID of market
old_tick_sizestringprevious minimum tick size
new_tick_sizestringcurrent minimum tick size
sidestringbuy/sell
timestampstringtime of event
Response
{
"event_type": "tick_size_change",
"asset_id": "65818619657568813474341868652308942079804919287380422192892211131408793125422",\
"market": "0xbd31dc8a20211944f6b70f31557f1001557b59905b7738480ca09bd4532f84af",
"old_tick_size": "0.01",
"new_tick_size": "0.001",
"timestamp": "100000000"
}

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last_trade_price Message

Emitted When:
  • When a maker and taker order is matched creating a trade event.
Response
{
"asset_id":"114122071509644379678018727908709560226618148003371446110114509806601493071694",
"event_type":"last_trade_price",
"fee_rate_bps":"0",
"market":"0x6a67b9d828d53862160e470329ffea5246f338ecfffdf2cab45211ec578b0347",
"price":"0.456",
"side":"BUY",
"size":"219.217767",
"timestamp":"1750428146322"
}
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