# Daily token volume · Elysium API · Femtos

> USD swap volume of a token per UTC day, both sides of every priced swap. Testnet pool prices.

- Base URL: `https://api.femtos.xyz/v1` (REST) · `wss://api.femtos.xyz/v1/ws` (WebSocket) · MCP: `https://api.femtos.xyz/mcp`
- Auth: `Authorization: Bearer $FEMTOS_KEY`. Free key: https://femtos.xyz/accounts/ (browser), or with
  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/elysium/volume

## Daily token volume — GET `/v1/volume`

USD swap volume of a token per UTC day, both sides of every priced swap. Testnet pool prices.

| Param | In | Example or values |
|---|---|---|
| `layer` | query | `elysium` |
| `token` | query | `<token>` |
| `days` | query | `30` |

```bash
curl -H "Authorization: Bearer $FEMTOS_KEY" "https://api.femtos.xyz/v1/volume?layer=elysium&token=<token>&days=30"
```

| Field | Type | Meaning |
|---|---|---|
| `days[]` | object | {day (UTC ms), volumeUsd, partial?}, oldest first, days with volume |
| `partial` | boolean | the indexed head day, still filling |
| `totalUsd` | decimal | sum over the days |
| `asOf · height` | int | indexed head: every swap up to that block counted |

## Related (Market data)

- [Candles](https://femtos.xyz/elysium/candles.md): OHLCV of one pool in pair price, USD and market cap, ascending, UTC-aligned.
- [Forming candle](https://femtos.xyz/elysium/ws-candles.md): The forming candle, pushed once per block where it changes.
- [Trades](https://femtos.xyz/elysium/trades.md): Latest swaps of one pool, newest first.
- [Trades stream](https://femtos.xyz/elysium/ws-trades.md): The swaps of one pool, one message per block that has some.
- [Token transfers](https://femtos.xyz/elysium/transfers.md): ERC-20 Transfer events of one token, newest first.
- [Liquidity events](https://femtos.xyz/elysium/liquidity.md): Liquidity added to and removed from one pool, newest first.

All Elysium endpoints: https://femtos.xyz/elysium.md