The Zap Ethereum NodeJS SDK provides access to the Zap Ethereum API. The API allows you to register accounts, set bond market parameters and expose tokenized services to offchain subscribers and onchain user-contracts. Developers can register data-providers on the Zap backend to serve both queries and subscription requests. The Zap platform serves as a data broker that enables providers to publish secure data feeds from a variety of endpoints that are monetized. Zap.org is a Smart Contract Oracle Marketplace that powers decentralized applications.