How to distinguish token from a liquidity pool?

Question

Let's take two addresses:

• Pancake LPs
• ElonGate

The first one is a liquidity pool that implements IPancakePair interface and the second one is a IERC20 token.

Short of inspecting the name, how can I differentiate the two programmatically?

I have abi for IPancakePair and IERC20.

Answer 1

The simplest way is to check if code implements interface of PancakePair or IERC20.

The way to do is that you need to pull the code using web3js and then check if it contains signature of every method in the interface, e.g.

const matchSignature = (
  web3: Web3Type,
  code: string,
  abi: $ReadOnlyArray<Object>,
) => {
  const contract = new web3.eth.Contract(
    abi,
  );

  return contract.options.jsonInterface.every((token) => {
    return !token.signature || code.includes(token.signature.slice(2));
  });
};