Etherscan – How to Get Transfers and Holders in One Contract

How about using Etherscan's Event Log API?

https://api.etherscan.io/api?module=logs&action=getLogs
    &fromBlock=0
    &toBlock=latest
    &address=[Token Contract Address]
    &topic0=0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef
    &topic1=[From Address, padded to 32 bytes - optional]
    &topic2=[To Address, padded to 32 bytes - optional]

In the above topic0 is the signature of an ERC20 Transfer event.

For example, the following link shows you all the send transactions of LLL tokens from my account (two transactions).

Here, your X (the token) is represented by the token's contract address, which is easy enough to find out for the various tokens.

As always, the API will return you a maximum of 10000 results, so you may need to manage fromBlock and toBlock accordingly.

I was able to verify my contract with optimization turned on, when compiling from remix:

https://ethereum.github.io/browser-solidity/

For some reason, it produces a different bytecode from Parity, even if you select the same compiler version and the same optimization setting.