Uniswap – Is There a Data Difference Between Uniswap v3 Subgraph and Smart Contract Queries?

api-designuniswap

I have been using Uniswap's v3 subgraph to query pool and other data. On the docs page, connecting using ethers.js (smart contract transactions), https://docs.uniswap.org/sdk/guides/using-ethers:

While this tutorial doesn't use the V3 SDK – it will set us up to use
it after we get the on-chain data we need.

Is there a difference in the data between the two – specifically pool prices? In addition, is it possible to perform trades, swaps, etc. Uniswap actions through Graphql? It seems from the documentation it's query only?

Best Answer

Collecting data from smart contracts can a cumbersome work, especially when you have a factory contract. Graph is used to make that task easier and reduce the number of requests sent to a node.

The data you get from the Graph is taken from the Uniswap contracts. Whenever an event in one of the Smart Contracts is triggered, a Graph node performs a task based on the event and stores the data. Once this is done, everyone is able to query the data from the Graph node in a single request, using a GraphQl query.

It is not possible to perform state-changing transactions through the Graph. It is only used to aggregate data. (mutate is the GraphQl terminology)

Related Solutions

Uniswap Trade History – How to Get Token Pair’s Trade History

You can use the Uniswap TheGraph for this! For example a query to get the last 10 swaps from the DAI/ETH pair would be:

{
    swaps(first: 10, where: { pair: "0xa478c2975ab1ea89e8196811f51a7b7ade33eb11" } orderBy: timestamp, orderDirection: desc) {
      transaction {
        id
        timestamp
      }
      id
      pair {
        token0 {
          id
          symbol
        }
        token1 {
          id
          symbol
        }
      }
      amount0In
      amount0Out
      amount1In
      amount1Out
      amountUSD
      to
    }
}

You can play around with queries at: https://thegraph.com/explorer/subgraph/uniswap/uniswap-v2. Integration into the frontend would happen with something like Apollo Client.

In fact this is also what the Uniswap Info is doing. It's open-source, so look around for example queries and how to use them.

For more information on how TheGraph and queries work, I just posted a blog-post about it: https://soliditydeveloper.com/thegraph.

Uniswap API – How to Query for Pair ID of a Chosen Token

You can write a query to filter all the liquidity pairs on Uniswap and get the pair address

    {  pairs (where :{token0 : "0x0f7f961648ae6db43c75663ac7e5414eb79b5704", token1 :"0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2"}) { // token1 is the ethereum address
    id
    createdAtTimestamp
    volumeUSD
    //any other field you want
  }
}

Best Answer

Related Solutions

Uniswap Trade History – How to Get Token Pair’s Trade History

Uniswap API – How to Query for Pair ID of a Chosen Token

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