Siacoin is a utility token of the cloud storage platform called the Sia network. Sia is open-source and blockchain-based. The operations take place on Sia's own blockchain. The coin is used to pay for storage rent transactions. The coin is Proof-of-Work-based meaning that Siacoin can be mined. Another use for the coin is trading.
WAX is a purpose-built blockchain and protocol token designed to make e-commerce transactions faster, easier, and safer for all participants. The WAX Blockchain uses Delegated Proof of Stake (DPoS) as its consensus mechanism and is meant to be fully backward compatible with EOS. The custom features and incentive mechanisms developed by WAX are designed to optimize the blockchain's usability in e-commerce, and encourage voting on guilds and proposals.