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Airnode is a fully-serverless first-party oracle node that lets API providers to connect their API directly to blockchain without a middleware.

Airnode Docs


Gas refers to the unit that measures the amount of computational effort required to execute specific operations on the Ethereum network.

Ethereum Docs


Extended public key which abbreviated to xpub is derived from mnemonic words where generated at each beacon's deployment procedure. Each beacon has its unique mnemonic words that separate it from other beacons.


A deterministic wallet is a system for deriving keys from a starting point. It is a tree-like structure where each node in the tree is able to derive new branches. HDNode here stands for Hierarchical Deterministic Node, where new keys are derived from.


ERC-20 is the standard for creating smart contract-enabled fungible tokens to be used in the Ethereum network.