# Launch detail & signals · Elysium API · Femtos

> Metrics, dev wallet, early buyers and risk signals of one launch.

- 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/elysium/signals

## Launch detail & signals — GET `/v1/launches/{token}`

Metrics, dev wallet, early buyers and risk signals of one launch.

| Param | In | Example or values |
|---|---|---|
| `token` | path | `<token>` |
| `earlyWindowSec` | query | `60` |

```bash
curl -H "Authorization: Bearer $FEMTOS_KEY" "https://api.femtos.xyz/v1/launches/<token>?earlyWindowSec=60"
```

| Field | Type | Meaning |
|---|---|---|
| `launch` | LaunchRow | same row as GET /api/launches |
| `metrics` | object | price, mcap, ATH mcap, holders, volume, traders, buyers, sellers |
| `dev` | object | creator balance, buys, sells, transfers out |
| `holders.top[]` | object | 20 largest, tagged dev \| early |
| `earlyBuyers` | object | wallets that bought in the first window |
| `signals[]` | object | {rule, severity, addresses, detail}, high first |
| `fees` | object | estimate: 1 % of volume |
| `ascend` | object | progress toward Ascended + coordination evidence (flagged wallets, their share) |

## Related (Holders & signals)

- [Holders](https://femtos.xyz/elysium/holders.md): Current balances of a token, largest first, with concentration.
- [Launch holders](https://femtos.xyz/elysium/launch-holders.md): Every holder of a launched token, tagged dev or early buyer, with concentration.

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