# 1.1 Supported Chains and Tokens

This section provides APIs to query the chains and tokens currently supported by the Wanchain Bridge.

There are two primary endpoints:

* `tokenPairs`
* `tokenPairsHash`

The `tokenPairs` endpoint returns detailed information about all supported chains and cross-chain tokens. Since this response can be large, it is recommended to first retrieve `tokenPairsHash` and compare it with the previously stored value. If there is no change, the locally cached data can be used to avoid unnecessary network requests each time.

**tokenPairs Endpoint**

**URL:**

[`https://bridge-api.wanchain.org/api/tokenPairs`](https://bridge-api.wanchain.org/api/tokenPairs)

**Response Example:**

```json
{
  "success": true,
  "data": [
    {
      "tokenPairID": "453",
			"symbol": "USDC",
      "fromChain": {
        "chainId": "0xa4b1",
        "slip44ChainID": "0x40000002",
        "chainType": "ARETH",
        "chainName": "Arbitrum"
      },
      "toChain": {
        "chainId": "0x38",
        "slip44ChainID": "0x800002ca",
        "chainType": "BNB",
        "chainName": "BNB Chain"
      },
      "fromToken": {
        "address": "0xaf88d065e77c8cc2239327c5edb3a432268e5831",
        "name": "USD Coin",
        "symbol": "USDC",
        "decimals": "6"
      },
      "toToken": {
        "address": "0x8ac76a51cc950d9822d68b83fe1ad97b32cd580d",
        "name": "USD Coin",
        "symbol": "USDC",
        "decimals": "18"
      }
    },
	  ...
  ]
}
```

As shown above, the returned data is an array containing all supported cross-chain token pairs on Wanchain, totaling over 300 items. You can apply local filtering based on your requirements before using the data. For instance, you can filter by `fromToken` and `toToken` addresses.

It is important to note that the `tokenPairs` data is bidirectional, meaning you do not need to consider the direction of `from` and `to`—as long as the chain and token addresses match, the pair is valid.

**tokenPairsHash Endpoint**

**URL:**

<https://bridge-api.wanchain.org/api/tokenPairsHash>

**Response Example:**

```json
{
  "success": true,
  "data": "39736194f3b3ecedb401fdfa6e4410b0"
}
```

This endpoint is used to check whether the tokenPairs data has changed before fetching the full dataset from the `tokenPairs` endpoint.