> ## 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 Token Approval Security endpoint

This endpoint accepts **only** the chains below. Any other `chainId` is rejected with `400`.

| Chain ID                  | Network Name    |
| ------------------------- | --------------- |
| 1                         | Ethereum        |
| 56                        | BNB Smart Chain |
| `728126428` (or `"tron"`) | TRON            |

`chainId` is an **integer or a string** — `56` and `"56"` are both valid.

<Note>
  TRON addresses are base58 (`T…`, 34 characters), not `0x` hex. Ethereum and BSC addresses are `0x` + 40 hex (checksummed or lowercase).
</Note>

## Usage

Include the `chainId` parameter in your request body:

```json theme={null}
{
	"chainId": "56",
	"owner": "0x..."
}
```