> For the complete documentation index, see [llms.txt](https://docs.lighter.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.lighter.xyz/developers/getting-started/environments.md).

# Environments & endpoints

Base URLs, chain IDs and contract addresses for mainnet and testnet.

| Item                   | Mainnet                                    | Testnet                                                    |
| ---------------------- | ------------------------------------------ | ---------------------------------------------------------- |
| REST base URL          | `https://mainnet.zklighter.elliot.ai`      | `https://testnet.zklighter.elliot.ai`                      |
| REST API prefix        | `/api/v1/`                                 | `/api/v1/`                                                 |
| WebSocket              | `wss://mainnet.zklighter.elliot.ai/stream` | `wss://testnet.zklighter.elliot.ai/stream`                 |
| Chain ID (for signing) | `304`                                      | `300`                                                      |
| Web app                | [app.lighter.xyz](https://app.lighter.xyz) | [testnet.app.lighter.xyz](https://testnet.app.lighter.xyz) |
| Explorer API           | `https://explorer.elliot.ai/api/`          | –                                                          |
| Deposit bridge API     | `https://bridge.lighter.xyz`               | –                                                          |

{% hint style="warning" %}
**Chain ID must match the environment**

The chain ID you pass to the signer must match the environment you send to. A transaction signed for `304` will be rejected by testnet, and vice versa.
{% endhint %}

{% hint style="info" %}
**Lighter on Robinhood Chain**

Lighter on Robinhood Chain is a separate exchange with its own endpoints (`api.rh.lighter.xyz`) and chain ID (`466324`). See [Lighter on Robinhood Chain](/developers/robinhood-chain/overview.md).
{% endhint %}

## Ethereum contract (mainnet)

Lighter's main contract on Ethereum holds platform collateral and handles deposits, secure withdrawals and priority transactions:

`0x3B4D794a66304F130a4Db8F2551B0070dfCf5ca7`

See [Priority Transactions](/developers/reference/priority-transactions.md) for its functions.

## Read-only WebSocket for restricted regions

Clients in restricted regions can still read market data:

```
wss://mainnet.zklighter.elliot.ai/stream?readonly=true
```

## Latency & colocation

For the lowest latency, run in **AWS Tokyo `ap-northeast-1`, AZ `apne1-az4`**. Premium/Advanced accounts on the top staking tier can request direct access that skips AWS CloudFront via the [#support](https://discord.com/channels/987399783985590322/1383469922943766608) Discord channel.

## Quick smoke test

```shell
# All markets with decimals and minimums
curl "https://mainnet.zklighter.elliot.ai/api/v1/orderBookDetails"

# System config (integrator fee caps, pool indexes)
curl "https://mainnet.zklighter.elliot.ai/api/v1/systemConfig"
```


---

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