The funding round was led by Zerodha’s Rainmatter with participation from Venture Catalysts, 9Unicorns, LetsVenture and Faad Network. : Global escrow banking solution provider Castler has raised $1 million in a seed funding round led by Zerodha’s venture capital arm Rainmatter with participation from Venture Catalysts, 9Unicorns, Faad Network and LetsVenture. Castler plans to use the funds to further expand its domestic and cross-border escrow product portfolio, go live with 10 more banks and grow its business by 10x over the next one year.