# Uniswap subgraph 范例

1、Uniswap info 如果要用在自己的基于Uniswap V2合约的Swap上，简单来讲要做以下调整：

A、subgraph.yaml 

修改数据源：

source: 

address: '0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f' 

abi: Factory 

startBlock: 10000834

这 里的address 和 startBlock 请根据实际的合约进行调整。startBlock一般以合约创建的区块作为起始区块。

network 目前在 HyperGraph中，Heco和BSC请写为mainnet， HSC的请写为hsc

B、修改代码src/mappings/helpers.ts 中的 Factory 合约地址

export const FACTORY\_ADDRESS = '0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f'

C、修改稳定币和跟踪流动性的白名单资产

修改的地方在: src/mappings/pricing.ts 注意，地址请务必用**小写**。

 **`const`**` ``WETH_ADDRESS = '0x5545153ccfca01fbd7dd11c0b23ba694d9509a6f'`

`// New Stablecoin pair needed!`

`// TODO: HUSD to HUSDT`

**`const`**` ``WHT_HUSD_PAIR = '0xf07b1e4a87794293f781373fd1f0cfa65e7592a4'`

`export function`` `**`getHtPriceInUSD`**`():`` `**`BigDecimal`** **`{`**

  `// fetch eth prices for each stablecoin`

  **`let`**` ``husdPair = Pair.load(WHT_HUSD_PAIR) // usdt is token0`

  `if (husdPair !== null)`` `**`{`**

    `return husdPair.token0Price`

  **`}`**` ``else`` `**`{`**

    `return ZERO_BD`

  **`}`**

**`}`**

`// token where amounts should contribute to tracked volume and liquidity`

**`let`**` ``WHITELIST: string[] =`` `**`[`**

  `'0x5545153ccfca01fbd7dd11c0b23ba694d9509a6f', // WHT`

  `'0x0298c2b32eae4da002a15f36fdf7615bea3da047', // HUSD`

  `'0x64ff637fb478863b7468bc97d30a5bf3a428a1fd', // ETH`

  `'0x66a79d23e58475d2738179ca52cd0b41d73f0bea', // HBTC`

  `'0xa71edc38d189767582c38a3145b5873052c3e47a'  // HUSDT`

**`]`**

Subgraph 示例下载地址：

{% embed url="<https://github.com/HGDotNetwork/Uniswap-v2-subgraph>" %}