Bitstack

Empower people to participate in a more open financial system It starts with helping people save & invest in Bitcoin, effortlessly.

[Inactive] API to measure and eliminate carbon emissions.

Y Combinator

Stackup is a suite of open-source developer tools for building user-friendly blockchain products. It starts with ERC-4337 infrastructure.

Y Combinator

WalletKit is a developer platform that abstracts away the complexities of blockchain tech and provides simple HTTP APIs.

Y Combinator