Stellar is an open-source, decentralized protocol for digital currency to fiat currency transfers which allows cross-border transactions between any pair of currencies. The Stellar protocol is supported by a nonprofit, the Stellar Development Foundation.
In 2014, Jed McCaleb, founder of Mt. Gox and co-founder of Ripple, launched the network system Stellar with former lawyer Joyce Kim. Before the official launch, McCaleb formed a website called “Secret Bitcoin Project” seeking alpha testers. The nonprofit Stellar Development Foundation was created in collaboration with Stripe CEO Patrick Collison and the project officially launched that July. Stellar received $3 million in seed funding from Stripe. Stellar was released as a decentralized payment network and protocol with a native currency, stellar. At its launch, the network had 100 billion stellars. 25 percent of those would be given to other non-profits working toward financial inclusion. Stripe received 2 percent or 2 billion of the initial stellars in return for its seed investment. The cryptocurrency, originally known as stellar, was later called Lumens or XLM. In August 2014, Mercado Bitcoin, the first Brazilian bitcoin exchange, announced it would be using the Stellar network. By January 2015, Stellar had approximately 3 million registered user accounts on its platform and its market cap was almost $15 million.
The Stellar Development Foundation released an upgraded protocol with a new consensus algorithm in April 2015 which went live in November 2015. The new algorithm used SCP, a cryptocurrency protocol created by Stanford professor David Mazières.
Lightyear.io, a for-profit entity of Stellar, launched in May 2017 as the commercial arm of the company. In September 2017, Stellar announced a benefits program, part of its Stellar Partnership Grant Program, which would award partners up to $2 million worth of Lumens for project development. In September 2018, Lightyear Corporation acquired Chain, Inc and the combined company was named Interstellar.