Are there any reliable sources for ERC20 tokens data via API?

I am trying to add as much token details as available to a single JSON file (https://github.com/ethfaction/erc20_tokens/blob/master/tokens_data.json).

Which can be easily accessed via a npm module ('erc20_tokens' - https://www.npmjs.com/package/erc20_tokens). Please refer any good sources of missing ERC20 tokens list.

Also any suggestions regarding the JSON formatting is welcome.

I am trying to fill in as much details as possible for as many tokens available. I would like to fill in details like: mktcap (daily basis), maximum gas used for token transfers (daily/weekly basis), total token supply, brief token descriptions, token names as per their contract etc. Also if you can manually update any of the known token details, pull requests are welcome.