l2:bbo

Best Bid/Offer — sent on every best bid or ask price/amount change. Full state, no deltas.

Channel: l2:bbo:{instrument} Example: l2:bbo:BTC_USDC-PERPETUAL

Payload

Positional array format. Empty string "" for absent sides.

[1704067200000, "50000", "1000", "50100", "800"]

Index	Type	Field	Description
0	integer	timestamp	Unix timestamp in milliseconds
1	string	best_bid_price	Highest bid price ("" if no bids)
2	string	best_bid_amount	Notional USD at best bid ("" if no bids)
3	string	best_ask_price	Lowest ask price ("" if no asks)
4	string	best_ask_amount	Notional USD at best ask ("" if no asks)

Subscribe — Protobuf SDK

import { Centrifuge } from "centrifuge/build/protobuf";

const client = new Centrifuge("wss://staging.kyan.sh/stream/websocket?format=protobuf");
const sub = client.newSubscription("l2:bbo:BTC_USDC-PERPETUAL");

sub.on("publication", (ctx) => {
  const data = ctx.data instanceof Uint8Array
    ? JSON.parse(new TextDecoder().decode(ctx.data))
    : ctx.data;

  const [timestamp, bidPrice, bidAmount, askPrice, askAmount] = data;
  // Empty string "" means no bids/asks on that side
});

sub.subscribe();
client.connect();

Recovery

BBO channels do not use cache recovery — updates are frequent enough that clients receive data within milliseconds. Reconnect recovery is still automatic (server-pushed).

Related channels

Channels providing related data.

Channel	Why
Index Price	Spot price for the underlying pair. Basis = BBO mid - index.
Funding Rate	Funding rate for the instrument. Derived from the basis (perp price - index).
Perps L2	Full 20-level depth behind the top-of-book prices shown here.
L2 Grouped	Price-bucketed aggregation of the same orderbook.
Options BBO	Options market IV and skew data for the same underlying.
Order Lifecycle	Your order fills, cancellations, and MMP events.
Trades (Perps)	Public trade tape showing executions, aggressor side, and size.