CoinDesk reported:
“Five years ago, before the launch of Uniswap v1, I deployed a token called HayCoin to use for testing,” he posted on X. “This was back when gas was so cheap that mainnet could be used as a testnet. After the launch of v1, I created a small test liquidity pool with a tiny fraction of the total supply and left the remainder in my wallet. I also used it to test the migration contract from Uniswap v1 to v2.”