# Trades · Elysium API · Femtos

> Latest swaps of one pool, newest first.

- 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/trades

## Trades — GET `/v1/trades`

Latest swaps of one pool, newest first.

| Param | In | Example or values |
|---|---|---|
| `layer` | query | `elysium` |
| `market` | query | `<pair>` |
| `limit` | query | `50` |

```bash
curl -H "Authorization: Bearer $FEMTOS_KEY" "https://api.femtos.xyz/v1/trades?layer=elysium&market=<pair>&limit=50"
```

| Field | Type | Meaning |
|---|---|---|
| `t · block` | int | block time (ms), block |
| `px · pxUsd` | decimal | price in quote, in USD |
| `sz · vq · usd` | decimal | size in token, quote, USD |
| `side` | B \| A | buy or sell of the token |
| `mcapUsd` | decimal \| null | market cap after the swap |
| `trader` | string | tx.from (the wallet, not the router) |
| `id` | string | <tx>:<log index>, dedupe REST + WS on it |
| `tx · logIndex` | string · int | source: the Swap log, with block |

## 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 stream](https://femtos.xyz/elysium/ws-trades.md): The swaps of one pool, one message per block that has some.
- [Daily token volume](https://femtos.xyz/elysium/volume.md): USD swap volume of a token per UTC day, both sides of every priced swap. Testnet pool prices.
- [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