# Coin detail · HyperCore API · Femtos

> One token: its links across layers, the markets it trades on, its 5 largest holders.

- 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/coin

## Coin detail — GET `/v1/coins/{layer}/{id}`

One token: its links across layers, the markets it trades on, its 5 largest holders.

| Param | In | Example or values |
|---|---|---|
| `layer` | path | `hypercore` |
| `id` | path | `HYPE` |

```bash
curl -H "Authorization: Bearer $FEMTOS_KEY" "https://api.femtos.xyz/v1/coins/hypercore/HYPE"
```

| Field | Type | Meaning |
|---|---|---|
| `coin` | object | {id, symbol, name, decimals, totalSupply, priceUsd, links} |
| `markets[]` | Market | markets where it is base or quote, most traded first |
| `holders` | object | 5 largest holders, or {unavailable} |

## Related (Holders)

- [Token holders](https://femtos.xyz/hypercore/holders.md): Spot balances of a HyperCore token, largest first.
- [Perp holders](https://femtos.xyz/hypercore/holders-positions.md): Largest open positions of a perp, long and short.
- [Token registry](https://femtos.xyz/hypercore/coins.md): HyperCore tokens with their HyperEVM contract and price.

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