# Holders · Elysium API · Femtos

> Current balances of a token, largest first, with concentration.

- 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/holders

## Holders — GET `/v1/holders`

Current balances of a token, largest first, with concentration.

| Param | In | Example or values |
|---|---|---|
| `layer` | query | `elysium` |
| `token` | query | `<token>` |
| `limit` | query | `20` |

```bash
curl -H "Authorization: Bearer $FEMTOS_KEY" "https://api.femtos.xyz/v1/holders?layer=elysium&token=<token>&limit=20"
```

| Field | Type | Meaning |
|---|---|---|
| `totalHolders` | int | positive balances, system excluded |
| `top10Share` | number \| null | 10 largest shares, 0–1 |
| `holders[]` | object | {address, amount, share, usd?, side?, label?} |
| `system[]` | object | bridge, pools, fee collector… (excludeSystem=0 to count them) |
| `asOf · height` | int | time and block of the balances |

## Related (Holders & signals)

- [Launch detail & signals](https://femtos.xyz/elysium/signals.md): Metrics, dev wallet, early buyers and risk signals of one launch.
- [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