> ## Documentation Index
> Fetch the complete documentation index at: https://docs.hashdit.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Supported Chains

> Blockchain networks supported by the Transaction Simulation endpoint

| Chain ID | Network Name     |
| -------- | ---------------- |
| 1        | Ethereum Mainnet |
| 56       | BNB Smart Chain  |

## Usage

Include the `chain_id` parameter in your request body:

```json theme={null}
{
  "chain_id": "56",
  "block_height": "58083468",
  "evm_transactions": [...]
}
```

<Info>
  When making API requests, use the chain ID as a string value (e.g., `"1"` for Ethereum Mainnet or `"56"` for BNB Smart Chain).
</Info>