# Token candles · API reference · Femtos

> OHLCV of a token through its USDC market (a perp coin: the perp). GET /v1/candles on Elysium, HyperCore and HyperEVM: parameters, response fields and a live call per layer.

- Base URL: `https://api.femtos.xyz/v1` (REST) · `wss://api.femtos.xyz/v1/ws` (WebSocket) · MCP: `https://api.femtos.xyz/mcp`
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  no browser: `GET https://femtos.xyz/accounts/agent/challenge`, solve its proof of work, then `POST https://femtos.xyz/accounts/agent/signup`
  (https://femtos.xyz/agents.md#agent-onboarding)
- Decimals are exact strings, times Unix milliseconds, addresses lowercase `0x`
- Whole API in one file: https://femtos.xyz/agents.md · OpenAPI: https://api.femtos.xyz/v1/openapi.json · Index: https://femtos.xyz/llms.txt
- Page with live calls: https://femtos.xyz/reference/token-candles

## Token candles — GET `/v1/candles`

- Elysium, HyperEVM: OHLCV of a token in USD through its reference pool, the most liquid one.
- HyperCore: OHLCV of a token through its USDC market (a perp coin: the perp).

Layers: Elysium, HyperCore, HyperEVM.
Page with live calls: https://femtos.xyz/reference/token-candles?layer=<elysium|hypercore|hyperevm>

| Param | In | Example or values | Meaning |
|---|---|---|---|
| `layer` | query | `elysium` (Elysium); `hypercore` (HyperCore); `hyperevm` (HyperEVM) | Layer (default: hypercore; token form: hypercore for a name, hyperevm for an address) |
| `token` | query | `<token>` (Elysium); `HYPE` (HyperCore); `<evmToken>` (HyperEVM) | Instead of market: the candles of a token. EVM layers: its side of its reference pool, o/h/l/c in USD (unit: usd), v in the token, vq in the other token, buys / sells, mcap; the answer names the pool (`market`, `reference`). HyperCore: the candles of the token's USDC spot market (a perp coin: the perp). The reference pool of a token: among its active pools whose USD price is known (pools of a spam token left out, unless the token itself is spam), the one with the largest liquidityUsd of at least $1,000 (twice the smaller side of what the pool contract holds at the indexed head, valued at USD prices: HyperCore for HYPE, WHYPE and the Core-linked tokens); when none reaches it, the most 24 h USD volume, then the most trades, then the oldest pool. Uniswap V4 / PancakeSwap Infinity / Balancer pools keep their tokens in a shared vault: their liquidity is not measured (null), they rank by volume. |
| `tf` | query | `1s`, `15s`, `1m`, `5m`, `15m`, `1h`, `4h`, `1d` | Candle unit |
| `limit` | query | `48` | Candles |

Elysium:

```bash
curl -H "Authorization: Bearer $FEMTOS_KEY" "https://api.femtos.xyz/v1/candles?layer=elysium&token=<token>&tf=1h&limit=48"
```

HyperCore:

```bash
curl -H "Authorization: Bearer $FEMTOS_KEY" "https://api.femtos.xyz/v1/candles?layer=hypercore&token=HYPE&tf=1h&limit=48"
```

HyperEVM:

```bash
curl -H "Authorization: Bearer $FEMTOS_KEY" "https://api.femtos.xyz/v1/candles?layer=hyperevm&token=<evmToken>&tf=1h&limit=48"
```

| Field | Type | Meaning |
|---|---|---|
| `market` | string | Market (token form: the reference pool / USDC market) |
| `reference` | object | token form, EVM: the reference pool (PoolRef) and its rule (Elysium, HyperEVM) |
| `unit` | usd \| usdc | token form: what o/h/l/c are in |
| `candles[]` | object | Ascending: {t, o, h, l, c, v, vq, n, vUsd, mcUsd, usd, mcap, …} |
| `candles[].o` | decimal | Open, in the quote (HyperCore: USDC; EVM pools: the quote token; token form: USD) |
| `candles[].buys` | int | token form (EVM): swaps buying the token (Elysium, HyperEVM) |
| `candles[].mcap` | object | Same candle as market cap in USD {o,h,l,c} (Elysium, HyperEVM): {o, h, l, c} (Elysium, HyperEVM) |
| `asOf` | ms | Time of `height` (HyperCore: ingested head; EVM: indexed head, committed with the candles) (Elysium, HyperEVM) |
| `height` | int | Head block of the layer the answer is cut at: every event up to it is counted (HyperCore: ingested head; EVM: indexed head, committed with the candles) (Elysium, HyperEVM) |
| `billing` | heavy | heavy over 30 days |
| `candles[].n` | int | Trades (HyperCore) |

## Related (Market data)

- [Markets](https://femtos.xyz/reference/markets.md) `GET /v1/markets`: Every tradable perp, spot, HIP-3 and outcome market with 24 h stats. (Elysium, HyperCore, HyperEVM)
- [Candles](https://femtos.xyz/reference/candles.md) `GET /v1/candles`: OHLCV of any HyperCore market down to 1 s, ascending, UTC-aligned. (Elysium, HyperCore, HyperEVM)
- [Forming candle](https://femtos.xyz/reference/ws/candles.md) `WS elysium.candles · hc.candles · hyperevm.candles`: The forming candle, pushed once per block where it changes. (Elysium, HyperCore, HyperEVM)
- [Trades](https://femtos.xyz/reference/trades.md) `GET /v1/trades`: Latest fills of one market, newest first. (Elysium, HyperCore, HyperEVM)
- [Trades stream](https://femtos.xyz/reference/ws/trades.md) `WS elysium.trades · hc.trades · hyperevm.trades`: All trades of one market as they happen: raced between our node and Hyperliquid's public feed, first copy sent, the other dropped. (Elysium, HyperCore, HyperEVM)
- [Order book](https://femtos.xyz/reference/book.md) `GET /v1/book`: L2 book of one market with order counts, from our node. (HyperCore)
- [Book stream](https://femtos.xyz/reference/ws/book.md) `WS hc.book`: Full-depth book, then the levels each block changes. (HyperCore)
- [Best bid / offer](https://femtos.xyz/reference/ws/bbo.md) `WS hc.bbo`: 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). (HyperCore)
- [Order updates](https://femtos.xyz/reference/ws/orders.md) `WS hc.orders`: Every order status change, filterable by coin, user and status. (HyperCore)
- [Token prices](https://femtos.xyz/reference/prices.md) `GET /v1/prices`: USD price of up to 100 tokens in one call, each with its source and provenance. (Elysium, HyperCore, HyperEVM)
- [Price history](https://femtos.xyz/reference/price-history.md) `GET /v1/prices/history`: USD closes per unit of up to 25 tokens over a window, or the price of 100 tokens at one time (at=). (Elysium, HyperCore, HyperEVM)
- [HYPE price](https://femtos.xyz/reference/ws/prices.md) `WS prices.hype`: HYPE from the Hyperliquid oracle, perp mark and exchanges. (HyperCore)
- [Pool detail](https://femtos.xyz/reference/pool.md) `GET /v1/pools/{address}`: One pool: dex, fee, tokens, liquidity in USD, depth, 5m to 24h activity, top LPs. (Elysium, HyperEVM)
- [Liquidity events](https://femtos.xyz/reference/liquidity.md) `GET /v1/liquidity`: Liquidity added to and removed from one pool, newest first. (Elysium, HyperEVM)
- [Daily token volume](https://femtos.xyz/reference/volume.md) `GET /v1/volume`: USD swap volume of a token per UTC day, both sides of every priced swap. (Elysium, HyperEVM)

Every page: https://femtos.xyz/reference.md