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

# Networks

> Working with supported blockchain networks

cNGN is issued on multiple blockchain networks. Endpoints that move value on-chain ([Withdraw](/api-reference/withdraw), [Bridge](/api-reference/bridge), and [Whitelist Address](/api-reference/whitelist-address)) identify the target chain with a **`networkId`**.

## Getting network IDs

Network IDs are environment-specific database identifiers, not fixed enums. Always fetch the current list at runtime or integration time from [Get Networks](/api-reference/get-networks):

```bash theme={null}
curl -X GET "https://api.cngn.co/v1/api/networks" \
  -H "Authorization: Bearer YOUR_API_KEY"
```

Decrypted response payload:

```json theme={null}
[
  {
    "id": "9b2e6a1f-3c4d-4e5f-8a7b-1c2d3e4f5a6b",
    "name": "Base",
    "short_name": "BASE",
    "isDisabled": false,
    "blockchain": null
  },
  {
    "id": "1f2e3d4c-5b6a-7988-9a0b-c1d2e3f4a5b6",
    "name": "Polygon",
    "short_name": "POLYGON",
    "isDisabled": false,
    "blockchain": null
  }
]
```

Use the `id` value as `networkId` in subsequent requests. Pass `?includeBlockchain=true` to include underlying blockchain metadata in the response.

## Supported chains

cNGN supports EVM chains (Ethereum, BNB Smart Chain, Polygon, Base, Asset Chain), Tron, and Bantu (XBN). The authoritative list for your environment is always the [Get Networks](/api-reference/get-networks) response. Networks with `isDisabled: true` cannot be used for withdrawals or bridging.

<Warning>
  Never hard-code network IDs across environments; test and live environments have different IDs for the same chain. Resolve IDs per environment.
</Warning>

## Contract addresses

Verified cNGN token contract addresses for every chain, mainnet and testnet, are listed on the [Contract Addresses](/guides/contract-addresses) page. Always verify contract addresses from the official source before interacting on-chain.