Token TrackerERC-20

ERC-20 Tokens By MarketCapitalization

The ERC-20 Token Tracker can search, discover and track all contracts that conform to the ERC-20 Token Standard

For an example, check for a sample Token Contract. However, because anyone can deploy an ERC-20 Token with their own custom Token Name and Symbol, thus please verify that the contract you are interacting with is the correct one by checking the Contract Address.