Pathfinder

A module leveraging subgraph data from api.thegraph.com, respective to chainId, to determine swap paths for token pairs.

Navigation

• Pathfinder
  • Usage
  • API
    • getPoolsForToken
    • getTokenPath
  • Limitations
  • Set up locally
  • Test locally

Usage

const pathfinder = new Pathfinder(1);
try {
  const Path = pathfinder.getTokenPath({
    tokenInAddress: "0x967da4048cd07ab37855c090aaf366e4ce1b9f48",
    tokenOutAddress: "0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48",
    IN: true,
  });
} catch (error) {
    //handle error
}

output

[
  '0x967da4048cd07ab37855c090aaf366e4ce1b9f48',
  '0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2',
  '0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48'
]

API

getPoolsForToken

Makes request for pools associated to a token, sets nodes on the graph for each pool. Returns the next tokens to be searched OR null if a path can be made.

pathfinder.getPoolsForToken({
    tokenAddress,
    destinationAddress,
    parentPoolAddress,
    IN,
    amt,
  }: {
    tokenAddress: string;
    destinationAddress: string;
    IN: boolean;
    parentPoolAddress: string;
    amt?: string;
  }): Promise<INextTokensToSearch | null>

getTokenPath

Gets token path for a swap pair. Returns an array of tokens to be traded in order to route to the destination token, optimised to be the shortes path possible.

 pathfinder.getTokenPath({
 tokenAddress,
 destinationAddress,
 parentPoolAddress,
 amt,
 abortSignal,
 IN,
}: {
 tokenAddress: string;
 destinationAddress: string;
 IN: boolean;
 parentPoolAddress?: string;
 amt?: string;
 abortSignal?: AbortSignal;
}): Promise<string[]>

nodes

The node graph being built by getPoolsForToken()

pathfinder.nodes

Limitations

Currently the subgraphs being queried are all subgraphs from the most popular dex's on supportedChains:

• uniswap (mainnet)
• quickswap (matic)
• carbonswap (EWT)
• pankackeswap (BSC)
• solarbeam (moonriver)

But there are other pools that are available. Apps like balancer use different pools and subgraphs, and support for these could potentially be added in the future.

Set up locally

1. Fork and/or clone
2. Run Yarn install
3. Run Yarn build

Test locally

1. Set up locally
2. Run yarn test