# Family token holders · HyperEVM API · Femtos

> Holders of one family token with balanceOf at the indexed head.

- 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/hyperevm/token-family

## Family token holders — GET `/v1/token-families/{token}`

Holders of one family token with balanceOf at the indexed head.

| Param | In | Example or values |
|---|---|---|
| `token` | path | `0xffaa4a3d97fe9107cef8a3f48c069f577ff76cc1` |
| `layer` | query | `hyperevm` |
| `limit` | query | `20` |

```bash
curl -H "Authorization: Bearer $FEMTOS_KEY" "https://api.femtos.xyz/v1/token-families/0xffaa4a3d97fe9107cef8a3f48c069f577ff76cc1?layer=hyperevm&limit=20"
```

| Field | Type | Meaning |
|---|---|---|
| `holders` | int | holders with a positive base |
| `top[]` | object | {address, base, balance, lastBlock} |
| `base · balance` | decimal | what the contract keeps (raw), balanceOf in token units |
| `state · stateBlock` | object · int | token state the formula reads |

## Related (Holders & tokens)

- [Holders](https://femtos.xyz/hyperevm/holders.md): Current balances of an ERC-20, largest first, with concentration.
- [Token registry](https://femtos.xyz/hyperevm/coins.md): HyperEVM tokens with their HyperCore spot link and price.
- [Coin detail](https://femtos.xyz/hyperevm/coin.md): One token: its links across layers, the markets it trades on, its 5 largest holders.
- [Daily token volume](https://femtos.xyz/hyperevm/volume.md): USD swap volume of a token per UTC day, both sides of every priced swap.
- [Token families](https://femtos.xyz/hyperevm/token-families.md): Tokens whose balance moves without Transfer logs: Aave aTokens and debt tokens, stHYPE, xStocks.
- [Spam tokens](https://femtos.xyz/hyperevm/spam-tokens.md): Tokens the indexer flags as spam, left out of every list, and the latest flag changes.

All HyperEVM endpoints: https://femtos.xyz/hyperevm.md