# Token across layers · Elysium API · Femtos

> One token from its Elysium launch to its HyperEVM mirror, HyperCore spot and perps, each link proven or marked inferred.

- 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/elysium/token-lifecycle

## Token across layers — GET `/v1/tokens/{token}/lifecycle`

One token from its Elysium launch to its HyperEVM mirror, HyperCore spot and perps, each link proven or marked inferred.

| Param | In | Example or values |
|---|---|---|
| `token` | path | `<token>` |

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

| Field | Type | Meaning |
|---|---|---|
| `stage` | string \| null | last stage reached: launched · registered · enrolled · committed · bridged · listed · perp |
| `stages[]` | object | {stage, reached, exact, basis, at {layer, block, time, tx}, observedAt, source, detail} |
| `addresses` | object | elysium · hyperevm · hypercore {index, spot} · perps[] |
| `links[]` | object | {from, to, relation, exact, basis: event \| registry \| attestation \| metadata \| name} |
| `conflicts · unavailable` | string[] | sources that disagree · that could not answer |
| `fees` | object \| null | exact fees of the pool from its events (Ascend) |
| `token` | path | also a HyperEVM address, core:<index>, a HyperCore name or perp coin |

## Related (Lifecycle)

- [Lifecycle stage changes](https://femtos.xyz/elysium/ws-ascend-lifecycle.md): A message when a launched token reaches its next stage: listing desk, HyperEVM mirror, HyperCore spot, perp.
- [Launch timeline](https://femtos.xyz/elysium/timeline.md): The whole life of a launch as ordered events with running state.

All Elysium endpoints: https://femtos.xyz/elysium.md