# Holders · API reference · Femtos

> Spot balances of a HyperCore token, largest first. GET /v1/holders on Elysium, HyperCore and HyperEVM: parameters, response fields and a live call per layer.

- 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/account/new (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/reference/holders

## Holders — GET `/v1/holders`

- Elysium: Current balances of a token, largest first, with concentration.
- HyperCore: Spot balances of a HyperCore token, largest first.
- HyperEVM: Current balances of an ERC-20, largest first, with concentration.

Layers: Elysium, HyperCore, HyperEVM.
Page with live calls: https://femtos.xyz/reference/holders?layer=<elysium|hypercore|hyperevm>

| Param | In | Example or values | Meaning |
|---|---|---|---|
| `layer` | query | `(empty)`, `hypercore`, `hyperevm`, `elysium` | Layer |
| `token` | query | `<token>` (Elysium); `HYPE` (HyperCore); `<evmToken>` (HyperEVM) | Token address (Elysium, HyperEVM), token name or perp coin (HyperCore) |
| `limit` | query | `20` | Rows |

Elysium:

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

HyperCore:

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

HyperEVM:

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

| Field | Type | Meaning |
|---|---|---|
| `holders[]` | object | {address, amount, share, side, usd, label, system, entity} |
| `totalHolders` | int | Holders (system excluded by default) |
| `top10Share` | number \| null | Sum of the top-10 shares |
| `system[]` | object | System addresses (≤ 50), share of supply including them: {address, amount, share, side, usd, label, system, entity} |
| `asOf` | ms | Snapshot time |
| `height` | int | Block of the snapshot (HyperCore: snapshot height; EVM: the indexed head the balances include) |
| `spam` | boolean | EVM: the token is flagged spam (tokens.spam); its holders still answer (HyperEVM) |
| `spamReason` | string \| null | EVM. Why the indexer flags it, comma list, strongest first: homoglyph:<T> (looks like token T), impostor:<T> (claims to be T; never alone), phishing_name, fake_transfers, unreadable_balance (balanceOf reverts: no ERC-20 behind its Transfer logs), verifier_ignore; null when not spam (HyperEVM) |

## Related (Holders & tokens)

- [Token registry](https://femtos.xyz/reference/coins.md) `GET /v1/coins`: HyperCore tokens with their HyperEVM contract and price. (Elysium, HyperCore, HyperEVM)
- [Coin detail](https://femtos.xyz/reference/coin.md) `GET /v1/coins/{layer}/{id}`: One token: its links across layers, the markets it trades on, its 5 largest holders. (Elysium, HyperCore, HyperEVM)
- [Token metadata](https://femtos.xyz/reference/tokens-batch.md) `GET /v1/tokens`: Metadata of up to 100 tokens: supply, creator, logo and socials when indexed, family, spam. Also POST with a JSON body. (Elysium, HyperCore, HyperEVM)
- [Token overview](https://femtos.xyz/reference/token-overview.md) `GET /v1/tokens/{address}`: One token across all its pools: price, FDV, market cap, liquidity, windows, holders, top pools. (Elysium, HyperEVM)
- [Token across layers](https://femtos.xyz/reference/token-lifecycle.md) `GET /v1/tokens/{address}/lifecycle`: One token from its Elysium launch to its HyperEVM mirror, HyperCore spot and perps, each link proven or marked inferred. (Elysium, HyperCore, HyperEVM)
- [Perp holders](https://femtos.xyz/reference/holders-positions.md) `GET /v1/holders`: Largest open positions of a perp, long and short. (HyperCore)
- [Token families](https://femtos.xyz/reference/token-families.md) `GET /v1/token-families`: Tokens whose balance moves without Transfer logs: Aave aTokens and debt tokens, stHYPE, xStocks. (Elysium, HyperEVM)
- [Family token holders](https://femtos.xyz/reference/token-family.md) `GET /v1/token-families/{token}`: Holders of one family token with balanceOf at the indexed head. (Elysium, HyperEVM)
- [Token transfers](https://femtos.xyz/reference/transfers.md) `GET /v1/transfers`: ERC-20 Transfer events of one token, newest first. (Elysium)
- [Token security](https://femtos.xyz/reference/token-security.md) `GET /v1/tokens/{address}/security`: Honeypot check: a buy, a transfer and a sell simulated on our node, taxes, owner powers, holders and LP, with a verdict. (Elysium, HyperEVM)
- [Spam tokens](https://femtos.xyz/reference/spam-tokens.md) `GET /v1/tokens/spam`: Tokens the indexer flags as spam, left out of every list, and the latest flag changes. (Elysium, HyperEVM)

Every page: https://femtos.xyz/reference.md