OpenSea has raised a total of $427 million across multiple funding rounds. It began with a $120K pre-seed round in January 2018, led by Y Combinator, followed by a $2 million seed round in May 2018 and $2.1 million in November 2019. Later, it secured $23 million in Series A (March 2021) and $100 million in Series B (July 2021), both led by Andreessen Horowitz. Its latest Series C round raised $300 million in January 2022 led by Paradigm and Coatue, reaching a $13.3 billion valuation.