Crypto Glossary - NFTs Crypto Guide

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.

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.