Californian bitcoin API developer Gem has announced an additional $1.3m in funding, raising its total to $3.3m.

The round was led by KEC Ventures, with additional contributions from First Round Capital, RRE Ventures – also an investor in 21 Inc and Abra – and early Facebook investor Robert Wolfson, among others.

Gem closed its previous round in September last year after receiving funds from Mesa Ventures, Idealab, James Joaquin and Brock Pierce's investment firm, Crypto Currency Partners.

A spokesperson for the platform said the newly acquired funds would be used to accelerate feature development and scale Gem's services for developers worldwide.