> For the complete documentation index, see [llms.txt](https://docs.native.org/native-dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.native.org/native-dev/build-with-native/swap-aggregators/firmquote-swap-apis/miscellaneous/amm-fallback.md).

# AMM Fallback

{% hint style="info" %}
Only supported in version 4 and above
{% endhint %}

Native Core liquidity provides remarkable depth and competitiveness for major assets like WETH and WBTC.

However, to use the Native Relay API in wallets or swap widgets, Native offers an AMM fallback option to support trading of nearly any tokens.

To enable this feature for your API key, contact Native team members through an existing channel.

### Quote and Swap

To use this feature:

* Make sure your API key is whitelisted for AMM fallback.
* Use `version=4` when calling `/firm-quote`.

`/indicative-quote` and `/firm-quote` will automatically utilise AMM liquidity if the quoted pair is not available from Native's own liquidity. No adjustment is needed. All returned fields will work as expected.

{% hint style="warning" %}
Please note that in liquidity fallback, the contract function that gets called is different. Normally, it should be `tradeRFQT`, but in AMM fallback, it will be `externalSwap`.

To track which function the swap tx is calling, check `txRequest.function`.
{% endhint %}

### Get Tradable Token

AMM fallback enables trading for thousands of tokens; therefore, it is impractical to show individual trading pairs in the `/orderbook` endpoint. Instead, we offer a new endpoint to keep track of all the supported tokens.

Call `/widget-tokens?chains={chainName}` with your API key.

Example:

```bash
## Get All Supported Tokens on Ethereum Including AMM Fallback
curl "https://v2.api.native.org/swap-api-v2/v1/widget-tokens?chains=ethereum" \
     -H "apiKey: $YOUR_KEY_HERE"
```

```json
{
  "ethereum": [
    {
      "name": "World Liberty Financial",
      "desc": "",
      "logo": "https://s2.coinmarketcap.com/static/img/coins/64x64/33251.png",
      "chain": "ethereum",
      "symbol": "WLFI",
      "address": "0xdA5e1988097297dCdc1f90D4dFE7909e847CBeF6",
      "decimals": 18,
      "isFeatured": false,
      "isStablecoin": true,
      "isSupported": true
    },
    {
      "name": "Skate",
      "desc": "",
      "logo": "https://static.native.org/logo/tokens/1_0x61DBbBb552dc893ab3aAd09F289f811E67cEf285.jpg",
      "chain": "ethereum",
      "symbol": "SKATE",
      "address": "0x61DBbBb552dc893ab3aAd09F289f811E67cEf285",
      "decimals": 18,
      "isFeatured": false,
      "isStablecoin": true,
      "isSupported": true
    },
    // ...
  ]
}
```