# Change Log

### \[2023-11-22]

**Descriptions**

* Original **XY API (Support Y Pool Only)** have been officially **renamed as yBridge API**
* Update Fee API [get-fee-structure](https://docs.xy.finance/single-bridge-integration/ybridge-api/get-fee-structure "mention") (<https://open-api.xy.finance/v1/yBridgeConfigs>)
  * Keep the previous version here [Broken link](https://docs.xy.finance/single-bridge-integration/ybridge-api/broken-reference "mention")(<https://open-api.xy.finance/v1//xyBridgeConfigs>)

### \[2023-09-28]

#### Features

* New API: [get-fee-structure](https://docs.xy.finance/single-bridge-integration/ybridge-api/get-fee-structure "mention")&#x20;
* New API: [get-pool-liquidity](https://docs.xy.finance/single-bridge-integration/ybridge-api/get-pool-liquidity "mention")

### \[2023-10-04]

#### Features

* New API: [supported-blockchains](https://docs.xy.finance/single-bridge-integration/ybridge-api/supported-blockchains "mention")

### \[2023-09-28]

#### Features

* New API: [get-fee-structure](https://docs.xy.finance/single-bridge-integration/ybridge-api/get-fee-structure "mention")&#x20;
* New API: [get-pool-liquidity](https://docs.xy.finance/single-bridge-integration/ybridge-api/get-pool-liquidity "mention")

### \[2022-08-10]

#### Features

* New API: [**Recommended Tokens**](https://docs.xy.finance/single-bridge-integration/ybridge-api/recommended-tokens)

### \[2022-06-01]

#### Features

* [**Build Swap Transaction**](https://docs.xy.finance/single-bridge-integration/ybridge-api/build-swap-transaction) supports custom slippage.

**Formulae**

* **Y Pool routes:**\
  The minimum of `toTokenAmount` is "<mark style="color:blue;">quote \* (1 - slippage)</mark>".
* **Multi-chain routes:**\
  The minimum `toTokenAmount` is calculated as "<mark style="color:blue;">(fromTokenAmount - slippage) - XY fee - (toTokenAmount - slippage)</mark>".

**Descriptions**

* After getting a quote (1 ETH of Ethereum to 6 BNB of BSC for instance) with the slippage tolerance at 1%, the minimum of `toTokenAmount` is 6 \* 99% = 5.94 BNB.
* As the X Swap detects the minimum of `toTokenAmount` is less than `quote*(1-slippage)`, in this case, 5.94 BNB as calculated above, the transaction itself will be revoked and then the *bridge token* will be returned to user.