https://nftscryptoguide.com/crypto-glossary/
Decentralized API (dAPI)
Application Programming Interfaces (APIs) services that are intrinsically interoperable with the blockchain technology are known as Decentralized Application Programming Interfaces (dAPIs). It originates from the API3 Protocol.Airnode
It is an oracle node and an API blockchain gateway deployed by API providers that desire to interact with the API3 blockchain protocol for placing their data feed(s) on-chain.