# Cross-layer wallet · HyperEVM API · Femtos

> One address (or a named wallet's handle) on HyperCore, HyperEVM and Elysium, plus its latest events.

- 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/wallet

## Cross-layer wallet — GET `/v1/wallet/{address}`

One address (or a named wallet's handle) on HyperCore, HyperEVM and Elysium, plus its latest events.

| Param | In | Example or values |
|---|---|---|
| `address` | path | `<owner>` |
| `includeSpam` | query | `(empty)`, `true` |

```bash
curl -H "Authorization: Bearer $FEMTOS_KEY" "https://api.femtos.xyz/v1/wallet/<owner>"
```

| Field | Type | Meaning |
|---|---|---|
| `hyperevm.balances[]` | object | {token, symbol, amount, priceUsd, usd, spam, spamReason, family?} at the indexed head |
| `includeSpam · spamHidden` | query · int | spam tokens out of lists and USD totals unless includeSpam=true |
| `hyperevm.height · asOf` | int | indexed head block and time |
| `hyperevm.nfts` | object | {erc721, erc1155, collections[], tokens[]} held |
| `hyperevm.activity` | object | {scope, swaps, transfers}: its moves are in recent[] |
| `hyperevm.freshness` | object | head, lagMs, blocksBehind, behindMs (as /api/status) |
| `hyperevm.bridges[] · bridges` | object | HyperCore ↔ HyperEVM transfers; legs in flight, journeys |
| `hypercore · elysium` | object | the same address on the other layers |

## Related (Bridge & wallet)

- [Bridge transfers](https://femtos.xyz/hyperevm/bridge.md): HyperCore ↔ HyperEVM transfers (core_evm) or HyperEVM ↔ Elysium movements (evm_elysium), with 24 h stats.
- [Bridge coverage](https://femtos.xyz/hyperevm/bridge-coverage.md): Every HyperCore ↔ HyperEVM leg since our data starts, paired with its other leg: matched share per direction and token, why the others are not, latency.
- [Bridge stream](https://femtos.xyz/hyperevm/ws-bridge.md): Each HyperCore ↔ HyperEVM transfer, initiated then completed.

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