Identify if a token contract was deployed using Create2

Question

Is there a way to analyze a token contract and determine if it was created using Create2?

Answer 1

const ethers = require("ethers");

(async () => {

  const provider = new ethers.JsonRpcProvider("YOUR_PROVIDER");

  const response = await provider.send("debug_traceTransaction", ["TX_HASH",{"tracer": "callTracer"},]);
  
  const calls = response.calls || [];
  const hasMatchingObject = calls.some(item => {
    return item.type === "CREATE2" && item.to === "CONTRACT_ADDRESS";
  });
  hasMatchingObject ? console.log("Create2") : console.log("No create2");

})();

This does what you need (it logs "create2" if the contract at CONTRACT_ADDRESS was created using create2 and "no create2" otherwise).

Here's how to run it (skip if you know)

install node.js.

create a new folder In this folder on a terminal window, run npm init (skip through everything its gonna ask you), then npm install ethers.

Still in this folder, create a .js file (name it as you want), paste this in it, (make sure to replace YOUR_PROVIDER, TX_HASH and CONTRACT_ADDRESS with the relevant values), then save it.

In your terminal window from earlier, run node yourfilename.js It's gonna return what i previously said.

My 0x address is in my bio if you wanna send something, but you don't have to, this took me 5 minutes and a google search.

---

EDIT (see comments) : On an etherscan contract page (etherscan.io/address/... not etherscan.io/token/..., those only show stats about a token), there is a 'contract creator', field. You can see the contract deployment transaction from here. If the transactions to field displays " ['address' Created], (like here) that means the contract was deployed directly from an EoA, and that it wasnt using create2. If the to field is just a contract address, without any mention of a contract creation (like here), that means the contract was deployed by another contract, in that case go to the 'Internal Txns' tab, if you see a line with create2_X_X_X there, that means create2 was used. If you see create_X_X_X, that means it wasnt.