Starkzap: Bitcoin in your app. Minutes, not months.

We’re introducing Starkzap, a TypeScript SDK that brings Bitcoin, stablecoins, DeFi, gaming, and other crypto features to any applications. It strips away blockchain complexity using Starknet’s native account abstraction, delivering a smooth UX through production-ready modules that plug directly into your existing stack.

Background

In the app development world, Bitcoin, DeFi, stablecoin and onchain gaming integrations are often the most talked-about features that never ship. We’ve seen a consistent cycle: teams kick off crypto initiatives with high energy, only to let them wither in the backlog.

The reason is not a lack of interest but rather the weight of the integration path: building wallet infrastructure, handling gas fees without degrading UX, building DeFi features from scratch, and stitching together multiple libraries. Taken together, these requirements represent months of work before anything reaches production.

Starkzap was built to collapse that timeline. It is open-source, DevX-friendly, and modular thanks to embedded wallets and proven DeFi components. Teams building with Starkzap can access ecosystem funding programs designed to support high-impact apps. Let’s dive into it:

Modules

Starkzap consists of four modules inside a single TypeScript package:

Wallets: bring social login to users, powered by Privy and the Cartridge Controller, allowing users to sign in via email, SMS, Passkeys (biometric authentication methods), social accounts (Google, Apple, Discord, Twitter, etc.), and crypto wallets (Metamask, Phantom, Rabby, Wallet Connect) without having to worry or know about seed phrases. Full self-custody is preserved while removing the onboarding friction that typically reduces conversion.
Paymaster: Gasless transactions out of the box via AVNU or built-in the Cartridge Controller. Users don’t need gas tokens to interact with Starknet and can onboard in seconds.
DeFi: easily integrate DeFi yield products without building the infrastructure from scratch. Starkzap gives apps easy access to native BTC and STRK staking, token sending and receiving, and balance checking. And soon, swaps, lending, borrowing, and cross-chain bridging.

Starkzap works across the web (React, Vite, Node.js) and mobile apps (iOS/Android, React Native, Expo). In one SDK, we’re helping you bring Bitcoin, stablecoins, and DeFito your users in minutes.

Starkzap helps your team:

Expand your existing products with Bitcoin, stablecoins, DeFi or onchain gaming.
Spend less time on technical integration and focus on growth and distribution.
Generate new revenues, without rebuilding your stack.
Design beautiful user experience with out-of-the-box embedded wallets.

Ecosystem Funding

Apps integrating Bitcoin, Stablecoins, and DeFi using Starkzap are eligible for funding by the many grants provided by the Starknet Foundation:

Seed Grants: Providing up to $25K in STRK for early-stage teams that have built an MVP or proof of concept. Applications are rolling with no deadline.
Growth Grants: Providing up to $1M for mature applications scaling on Starknet, across six funding tracks, including a dedicated Bitcoin Builder Grants track and “The Next Billion” Grants for user-friendly onboarding that maintains self-custody.
Propulsion Program: reimbursing users’ gas fees up to $1M over 12 months, with up to 100% coverage in the first tier.

Together, these programs provide up to $2M in ecosystem support for qualified projects.

What’s Next

Starkzap is available today. Teams can install the SDK, integrate Starknet in minutes, and begin exploring how Bitcoin, stablecoins, and DeFi fit their product. We’re quickly adding new features (Swap, Borrowing, Bridging, Perps etc.), giving you more ways to deliver value to your users. For teams that build something compelling, the ecosystem funding pathway is designed to support each stage from prototype to production.

Start now, start simple: