# Lighter overview

> Lighter on Supanode — WebSocket streaming off the zk order book, a SQL indexer over its trading history, and single-tenant hardware. All three are in build.

Lighter is an **application-specific zk rollup for perpetual trading**, built on Ethereum. It runs one application rather than a general smart-contract platform, so there is no EVM here and no contracts to call - the venue itself is the chain.

<Note>
**Everything on this page is in build.** Nothing on Lighter is on sale yet. Tell us on Telegram which streams or tables you need and you go to the front of the queue when it opens.
</Note>

## What is being built

- **WebSocket streaming** - order-book snapshots and deltas per market, trade prints as they are matched, and account, position and liquidation updates over one connection.
- **Historical data indexer** - the same trading history as typed ClickHouse tables, queried in plain SQL like every other Supanode indexer.
- **Dedicated hardware** - single-tenant capacity for teams that need the feed to themselves.

## The chain itself

| | |
|---|---|
| Type | Application-specific zk rollup on Ethereum |
| Proof system | Plonky2 circuits covering order matching and liquidations |
| Data availability | Ethereum blobs |
| Execution | No EVM and no smart contracts - the rollup runs one application |
| Mainnet genesis | 17 January 2025 |

Sources: [L2BEAT](https://l2beat.com/scaling/projects/lighter), [Lighter API docs](https://apidocs.lighter.xyz/reference/export.md).

<Tip>
**Why there is no RPC product here.** There is no EVM to call. Everything a trading system needs on Lighter arrives over the order-book stream or comes out of history, which is exactly what the two products above are.
</Tip>

## Where to next

<CardGroup cols={2}>
  <Card title="Pricing" icon="tag" href="https://supanode.xyz/docs/lighter/pricing">
    What will be billed, and why there are no numbers yet.
  </Card>
  <Card title="Talk to us on Telegram" icon="send" href="https://telegram.me/supanode_tgs">
    Tell us what you need and we come back to you first when it opens.
  </Card>
</CardGroup>