# KOL stream · HyperCore API · Femtos

> Every fill, liquidation, EVM swap, transfer and bridge leg of a named wallet, live.

- 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` (or `X-API-KEY: $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/hypercore/ws-kols

WebSocket: get a ticket (`POST https://api.femtos.xyz/v1/ws-ticket` with your key), connect to `wss://api.femtos.xyz/v1/ws?ticket=$TICKET`, send the frame below; the first message has `"snapshot": true`. Details: https://femtos.xyz/agents.md#websocket

## KOL stream — WS `kol.activity`

Every fill, liquidation, EVM swap, transfer and bridge leg of a named wallet, live.

| Param | In | Example or values |
|---|---|---|
| `min_notional` | filter | `1000` |

```json
{"op":"subscribe","channel":"kol.activity","filter":{"min_notional":"1000"}}
```

| Field | Type | Meaning |
|---|---|---|
| `snapshot: true` | KolItem[] | last 50 moves seen |
| `data` | KolItem | {layer, kind: trade \| liquidation \| swap \| transfer \| bridge, wallet, entity, coin, side, notional} |

## Related (Named wallets)

- [KOL leaderboard](https://femtos.xyz/hypercore/kols.md): KOLs, traders and funds ranked by their HyperCore PnL, volume and open positions.
- [KOL trades](https://femtos.xyz/hypercore/kol-activity.md): The latest fills of the named wallets, newest first, with who traded.
- [Named wallets](https://femtos.xyz/hypercore/entities.md): Every named entity, its X account, kinds, sources and wallets.
- [One entity](https://femtos.xyz/hypercore/entity.md): One named entity: its wallets on the three layers and 30 days of HyperCore trading.

All HyperCore endpoints: https://femtos.xyz/hypercore.md