> For the complete documentation index, see [llms.txt](https://docs.xy.finance/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.xy.finance/single-bridge-integration/ybridge-contract-integration/integrate-ybridge-contract/latest-upgrade-2024-07-17.md).

# Latest Upgrade ( 2024/07/17 )

**New functions**

* `adaptorForAdditionalFeeBlacklist(address): bool`: Lookup DEX aggregator adaptors, which provide swapping service, that’s NOT allowed to be used by old version of function `swapWithReferrer(...)`
* `additionalFeeReceiver()`: For managing purpose
* `additionalFeeConfig(address): uint256`: Lookup the amount of native token it takes to utilize the DEX aggregator adaptor. If it returns `0`, a default value of `additionalFeeConfig(address(0))` will be charged

**Cross chain swap**

* **The old interface**, `swapWithReferrer(address,(address,address,address,uint256,uint256),bytes,(uint32,address,uint256,uint32),address): 2aac3cac`, **is kept**.
  1. **Fees** : It doesn’t apply additional fees as before but cannot go through blacklisted DEX aggregator adaptors (`adaptorForAdditionalFeeBlacklist(address): bool`).
  2. **Event** : Changed to `SwapRequested(uint256,address,(uint32,address,address,uint256,uint32),address,address,uint256,address,uint256,uint256,address): 0xb0e9a29a6096a927bd389ba0d0d1a15f82df21a331d23a33eeb7de1cf7ab2684` **from** `SwapRequested(uint256,address,(uint32,address,uint256,uint32),address,address,uint256,address,uint256,uint256,address):0x40218dc7047d6a284746d042d62140b3629db83daefcd944659e90b4c74b7eb0`
* **The new overloading interface**, `swapWithReferrer(address,(address,address,address,uint256,uint256),bytes,(uint32,address,address,uint256,uint32),address): cdc65927`, **is added.**
  1. Fees: It charges native token according to `additionalFeeConfig` for both source chain and destination chain swapping DEX aggregator adaptor used.
  2. Mechanism: Same as the old `swapWithReferrer`, but charges DEX aggregator adaptor fees according to `additionalFeeConfig`. With enough `msg.value` sent along with the transaction, **extra native token would be refunded back to the caller**.
  3. Event: The same event, `SwapRequested(uint256,address,(uint32,address,address,uint256,uint32),address,address,uint256,address,uint256,uint256,address): 0xb0e9a29a6096a927bd389ba0d0d1a15f82df21a331d23a33eeb7de1cf7ab2684`emitted as the other `swapWithReferrer`


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