HyperCore · Market data

Best bid / offer

Top of book of one market each block: raced between Hyperliquid's public feed and our node (newest block wins, our node corrects the same block).

WebSocket channel hc.bbo on wss://api.femtos.xyz/v1/ws

Parameters

Param	In	Example or values
`coin`	filter	`BTC`

{"op":"subscribe","channel":"hc.bbo","filter":{"coin":"BTC"}}

Key: Authorization: Bearer $FEMTOS_KEY or X-API-KEY. Get a free key, or with no browser through agent onboarding.

Field	Type	Meaning
`data.bbo`	[[px, sz, n], [px, sz, n]]	best bid, best ask: price, size, order count
`data.time`	int	block time (ms)
`data.block`	int \| null	null when the public feed was first
`latency_ms.source_to_sent`	int	block → sent by the server

Markets GET /v1/markets
Every tradable perp, spot, HIP-3 and outcome market with 24 h stats.
Candles GET /v1/candles
OHLCV of any HyperCore market down to 1 s, ascending, UTC-aligned.
Forming candle WS hc.candles
The forming candle, pushed once per block where it changes.
Trades GET /v1/trades
Latest fills of one market, newest first.
Trades stream WS hc.trades
All trades of one market as they happen: raced between our node and Hyperliquid's public feed, first copy sent, the other dropped.
Order book GET /v1/book
L2 book of one market with order counts, from our node.
Book stream WS hc.book
Full-depth book, then the levels each block changes.
Order updates WS hc.orders
Every order status change, filterable by coin, user and status.
HYPE price WS prices.hype
HYPE from the Hyperliquid oracle, perp mark and exchanges.