API reference · Market data
Trades stream
- Elysium, HyperEVM: The swaps of one pool, one message per block that has some.
- HyperCore: All trades of one market as they happen: raced between our node and Hyperliquid's public feed, first copy sent, the other dropped.
WebSocket channel elysium.trades on wss://api.femtos.xyz/v1/ws · WebSocket channel hc.trades on wss://api.femtos.xyz/v1/ws · WebSocket channel hyperevm.trades on wss://api.femtos.xyz/v1/ws
Parameters
| Param | In | Example or values | Meaning |
|---|---|---|---|
pair | filter | <pair> (Elysium); <evmPair> (HyperEVM) | Pool key: the pool address, or <PoolManager>:<PoolId> (V4, PancakeSwap Infinity); any case (Elysium, HyperEVM) |
coin | filter | BTC | HyperCore market: BTC, @107 (spot), xyz:TSLA (HIP-3) (HyperCore) |
Subscribe
Elysium
{"op":"subscribe","channel":"elysium.trades","filter":{"pair":"<pair>"}}HyperCore
{"op":"subscribe","channel":"hc.trades","filter":{"coin":"BTC"}}HyperEVM
{"op":"subscribe","channel":"hyperevm.trades","filter":{"pair":"<evmPair>"}}Key: Authorization: Bearer $FEMTOS_KEY. Get a free key, or with no browser through agent onboarding.
Response fields
| Field | Type | Meaning |
|---|---|---|
snapshot: true | ElysiumTrade[] | last 50 swaps at subscribe, chronological (Elysium) |
data | ElysiumTrade[] | the swaps of the pair in one block: {t, px, sz, side, id, block, tx, logIndex, vq, usd, pxUsd, mcapUsd, …} (Elysium) |
latency_ms.source_to_sent | int | block → sent by the server (Elysium) |
snapshot: true | HcTrade[] | last 50 trades of the market at subscribe (HyperCore) |
data | HcTrade[] | the new trades: HyperCore trades of the market as they happen, raced between our node and Hyperliquid's public feed (first copy sent): {t, px, sz, side, tid, block, hash, users} (HyperCore) |
data[].tid | int | trade id, unique: dedupe on it (HyperCore) |
data[].users | [string, string] | [buyer, seller], lowercase 0x (HyperCore) |
data[].hash | string | transaction hash (all zeros when the public feed gives none) (HyperCore) |
data[].block | int | null | null when the public feed was first; our node fills it in the snapshots (HyperCore) |
latency_ms.source_to_sent | int | trade time → sent by the server (HyperCore) |
snapshot: true | Trade[] | last 50 swaps at subscribe, chronological (HyperEVM) |
data | Trade[] | the swaps of the pair in one block, as they are indexed (polled every 500 ms): {t, px, sz, side, id, block, tx, logIndex, vq, usd, pxUsd, mcapUsd, …} (HyperEVM) |
Related: Market data
- Markets GET /v1/markets Elysium, HyperCore, HyperEVM
Every tradable perp, spot, HIP-3 and outcome market with 24 h stats. - Candles GET /v1/candles Elysium, HyperCore, HyperEVM
OHLCV of any HyperCore market down to 1 s, ascending, UTC-aligned. - Forming candle WS elysium.candles · hc.candles · hyperevm.candles Elysium, HyperCore, HyperEVM
The forming candle, pushed once per block where it changes. - Token candles GET /v1/candles Elysium, HyperCore, HyperEVM
OHLCV of a token through its USDC market (a perp coin: the perp). - Trades GET /v1/trades Elysium, HyperCore, HyperEVM
Latest fills of one market, newest first. - Order book GET /v1/book HyperCore
L2 book of one market with order counts, from our node. - Book stream WS hc.book HyperCore
Full-depth book, then the levels each block changes. - Best bid / offer WS hc.bbo HyperCore
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). - Order updates WS hc.orders HyperCore
Every order status change, filterable by coin, user and status. - Token prices GET /v1/prices Elysium, HyperCore, HyperEVM
USD price of up to 100 tokens in one call, each with its source and provenance. - Price history GET /v1/prices/history Elysium, HyperCore, HyperEVM
USD closes per unit of up to 25 tokens over a window, or the price of 100 tokens at one time (at=). - HYPE price WS prices.hype HyperCore
HYPE from the Hyperliquid oracle, perp mark and exchanges. - Pool detail GET /v1/pools/{address} Elysium, HyperEVM
One pool: dex, fee, tokens, liquidity in USD, depth, 5m to 24h activity, top LPs. - Liquidity events GET /v1/liquidity Elysium, HyperEVM
Liquidity added to and removed from one pool, newest first. - Daily token volume GET /v1/volume Elysium, HyperEVM
USD swap volume of a token per UTC day, both sides of every priced swap.
More
- This page as Markdown
- The whole API reference
- What Elysium serves
- What HyperCore serves
- What HyperEVM serves
- The whole API in one Markdown file
- OpenAPI 3.1 document
Agent guide (agents.md)llms.txtOpenAPIMCP serverGet an API keyChangelog