i’ve been following Starknet for a while now, and one thing that’s always stood out to me is how the team approaches problems differently from the rest of the space. not just “let’s make it faster” but “let’s actually fix the experience.”
Starkzap v2 is the clearest example of that so far.
this article is my attempt to break down what it is, what’s inside, and why i think it’s a genuinely big deal — both for builders who’ve been too intimidated to go onchain and for the ones who’ve tried and hit walls.
the problem nobody wants to admit
here’s the honest truth about crypto integrations in 2026: most of them never ship.
in the app development world, Bitcoin, DeFi, and stablecoin integrations are some of the most talked about features that never actually make it to production. teams kick off these initiatives with high energy, only to let them wither in the backlog.
and if you’ve ever tried to build something onchain, you know exactly why. it’s not one problem. it’s a pile of problems that all land on you at the same time:
∙ how do users create a wallet without a seed phrase?
∙ who pays for gas fees and how?
∙ which library handles swaps? which one handles staking? do they work together?
∙ what happens when a transaction fails mid-flow?
∙ how do you test all of this without spending hours in testnet hell?
key management, gas fees, wallet popups, fragmented tooling, complex testing and deployment taken together, these pain points have been the main reason mainstream apps haven’t gone onchain at scale.
Starkzap was built to cut through all of that. and v2 takes it to a completely different level.
what Starkzap actually is
Starkzap is a TypeScript SDK for building consumer applications with Starknet wallet integration, token operations, and DeFi features. it enables any application to bring Bitcoin, stablecoins, and DeFi to their users built on Starknet’s native account abstraction without requiring users to manage seed phrases or understand blockchain complexity.
the key phrase there is “native account abstraction.” this isn’t a layer bolted on top. Starknet’s account abstraction lets you hide blockchain complexity entirely no seed phrases, optional gasless flows and it works on web (React, Vite, etc.), iOS and Android (React Native, Expo), and Node.js backends.
that last part matters. this isn’t a web only tool. if you’re building mobile, it works there too.
what’s inside v2
v1 already covered wallet onboarding, ERC20 transfers, STRK staking, a fluent transaction builder, AVNU paymaster support for gasless transactions, and social login via Privy and Cartridge. v2 adds the full DeFi layer: swaps, DCA, lending and borrowing, multichain bridging from Ethereum and Solana, and confidential transfers powered by Tongo.
let me go through each one.
wallets and social login
the wallets module brings social login to users powered by Privy and the Cartridge Controller, allowing sign-in via email, SMS, passkeys, social accounts like Google, Apple, Discord, and Twitter, and crypto wallets like MetaMask and Phantom all without seed phrases. full self-custody is preserved while removing the onboarding friction that typically kills conversion.
here’s what initializing a wallet actually looks like:
import { StarkZap, StarkSigner, OnboardStrategy } from "starkzap";
const sdk = new StarkZap({ network: "mainnet" });
const { wallet } = await sdk.onboard({
strategy: OnboardStrategy.Signer,
account: {
signer: new StarkSigner("0xYOUR_PRIVATE_KEY")
},
deploy: "if_needed",
});
what that code is doing: you initialize the SDK, tell it which network you’re on, and onboard a user with one method call. the deploy: "if_needed" part means the wallet only deploys to the chain when it actually needs to no wasted gas. the user doesn’t see any of this. they just signed in with Google and they’re in.
gasless transactions via paymasters
The paymaster module enables 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.
think about what this means for a product team. you know how Uber doesn’t ask you to pay for server costs per ride? same idea. your app absorbs the gas cost. your users never see a gas fee popup. they just click a button and something happens.
token transfers simple but done properly
here’s a real transfer example straight from the SDK:
import { Amount } from "starkzap";
const usdcAmount = Amount.parse("25", USDC);
const tx = await wallet
.tx()
.transfer(USDC, [
{ to: recipientA, amount: usdcAmount },
{ to: recipientB, amount: Amount.parse("5", USDC) },
])
.send({ feeMode: "user_pays" });
await tx.wait();
what’s happening here: you’re sending USDC to two different recipients in a single transaction. Amount.parse handles all the decimal precision stuff that normally trips people up in crypto. you call .send(), you call .wait(), done. think of it like Stripe, but your app handles payments directly without a middleman taking a cut.
swaps
two swap providers ship out of the box: AVNU, a DEX aggregator that routes across multiple protocols, and Ekubo, Starknet’s concentrated liquidity AMM. both implement a common SwapProvider interface, so you can swap providers or combine them without changing your app code.
this is a detail that matters more than it sounds. if you’ve ever integrated two different DeFi protocols and had to rewrite your logic every time one of them changes their API you understand why a shared interface is a big deal.
DCA (dollar-cost averaging)
this one is genuinely underrated. DCA automatically buying an asset at regular intervals is one of the most requested features in any fintech or savings app. normally building it means scheduling logic, price feeds, execution layers, and error handling across all of them.
with Starkzap v2 it’s a single primitive. you set the token pair, the amount, and the frequency. the SDK handles execution through AVNU or Ekubo automatically. any savings app, investment tool, or wealth management product can ship this feature now without rebuilding the engine.
lending and borrowing via Vesu
yield products are one of the strongest retention drivers in financial apps. being able to let users earn interest on idle assets or borrow against them used to require deep DeFi integration work. Starkzap v2 plugs this in through Vesu, one of Starknet’s leading lending protocols, as a ready to use module.
Bridging from Ethereum and Solana
users shouldn’t have to leave your app to move funds in. Ethereum bridging and Solana bridging are both available as separate install modules depending on which chain you need to pull from. the user stays in your interface. the bridging happens behind the scenes.
confidential transfers the most technically interesting addition
this is the one i find most compelling.
all ZK proof generation happens locally in the SDK before submitting transactions. the chain never sees the amount in plaintext.
here’s what using it looks like:
import { StarkZap, TongoConfidential } from "starkzap";
const sdk = new StarkZap({ network: "mainnet" });
const wallet = await sdk.connectWallet({ account: { signer, accountClass } });
const confidential = new TongoConfidential({
privateKey: tongoPrivateKey,
contractAddress: TONGO_CONTRACT,
provider: wallet.getProvider(),
});
const state = await confidential.getState();
console.log("Active balance:", state.balance);
what’s happening: a separate private key handles the confidential layer. the ZK proof is generated on the user’s device. by the time the transaction reaches the chain, all it sees is “this is valid.” the amount is never exposed. not to the chain, not to anyone watching the chain.
this is the same privacy architecture that powers STRK20s private balances for every ERC-20 on Starknet, coming to mainnet in April. when these two converge, any app built with Starkzap can offer private payments and private DeFi natively.
The business case is real
most apps haven’t figured this out yet. the playbook hasn’t been written. builders who move now are defining what money features in apps look like for the next decade.
the revenue streams are concrete too:
swap fees, yield on lending products, BTC staking rewards, DCA subscription mechanics, private transfer rails, and bridging flows all accessible through one SDK. the SDK is free and open source under MIT license. transaction fees on Starknet are fractions of a cent.
and for teams that ship something compelling, the support structure is already there. apps integrating Bitcoin, stablecoins, and DeFi using Starkzap are eligible for a $25,000 seed grant for early stage teams, up to $1 million in growth grants, and up to $1 million in gas rebates through the Propulsion Program.
there’s also a live bounty running until April 17 $3,000 for the top developer builds and $1,500 for the best content. details at thewp1.xyz/DeveloperBounty.
This is already working in production
FocusTree is the proof. they’re a productivity app a Forest competitor that added stake to focus mechanics through Starkzap and scaled to over a million users. that’s a Web2 product team using one SDK to add financial features their users actually engage with.
that’s not a demo project. that’s a shipped product at real scale built by people who weren’t blockchain developers.
The bigger picture
Starkzap v2 isn’t just a developer tool update. it’s the clearest signal yet that Starknet is serious about being the layer where Web2 meets onchain finance.
the infrastructure has been here for a while the scalability, the account abstraction, the ZK stack, the proving systems. what was missing was the bridge between “powerful infrastructure” and “mainstream developer experience.”
Starkzap is that bridge.
New to blockchain? the SDK is designed to be beginner friendly while remaining powerful for experienced developers. if you can write TypeScript, you can use this. your users will never know they’re on a blockchain.
the toolkit is here. the grants are here. the bounty is live.
what are you building?
links:
∙ docs: docs.starknet.io/build/starkzap
∙ github: github.com/keep-starknet-strange/starkzap
∙ projects built on it: awesome-starkzap
∙ bounty: thewp1.xyz/DeveloperBounty
Top comments (0)