The custody model shapes security, recovery, user experience and your legal obligations. We help you choose it before the build starts.
These usually appear when a crypto feature moves from a prototype to something real customers will hold money in.
A fintech, gaming or marketplace product wants balances, transfers or token payments without sending users elsewhere.
Asking people to install an extension or manage a seed phrase kills conversion for a mainstream audience.
Customers ask for a new network or token, and the current wallet code can't take it without major changes.
Support gets lost-device and lost-phrase tickets it has no good way to resolve.
Leadership is weighing custodial, non-custodial or MPC options and needs the technical and operational trade-offs laid out.
Crashes, slow balance updates or unreliable withdrawals are eroding trust in the product.
iOS and Android wallet apps with balances, send and receive, QR codes, history and secure on-device key storage.
Browser extension and web wallets, plus wallet connection flows for dApps and web products.
Wallets created inside your existing app at sign-up, so users get an address without installing anything else.
Non-custodial, custodial, MPC or smart-account setups, with backup and recovery designed for real users.
An architecture where chains, tokens and fee logic are added as modules instead of rewrites.
Fiat purchase and cash-out providers and identity verification services connected to your wallet flows.
Wallet connection, transaction building and signing added to an existing web or mobile product and its backend.
Our own review of key storage, signing flows, dependencies and backend services before launch, with fixes for what we find. It complements an independent audit; it doesn't replace one.
Whatever the custody model and chains, the same basics decide whether users trust a wallet with their money.
Who holds which key, written down
Custodial, non-custodial, MPC or smart account chosen on purpose
Keys in secure device storage or managed key services
Recovery paths tested before launch
Plain-language transaction previews
Warnings for unusual approvals and addresses
Fee estimates shown before confirmation
Clear pending, failed and confirmed states
Fallback node and data providers
Balance and history updates users can trust
Handling for stuck and replaced transactions
New chains added as modules
Security review before real funds arrive
Dependencies and SDKs kept up to date
KYC and screening where your model needs them
Logs and alerts for withdrawals and errors
You're adding crypto balances, stablecoin transfers or token payments to an existing financial product.
You need a wallet or an embedded wallet as the core of a new dApp, exchange or consumer crypto app.
Gaming, loyalty, marketplace or ticketing products that want on-chain assets without a crypto-native audience.
You own the client and the design, and need engineers for the wallet, key management and chain integration behind it.
Mobile, browser or both.
Addresses created at sign-up.
Trade-offs laid out for your case.
Extend an existing wallet.
Fiat in, fiat out, identity checks.
Review, stabilize, then extend.
We map users, assets, chains and money flows, then compare custody models with your legal and risk advisers before any code is written.
Key management, node, ramp and KYC providers chosen against your requirements, with a modular design for chains and tokens.
Sign-up, backup, recovery and transaction screens prototyped and tested with users before they are built.
Wallet app and backend built in sprints and tested on test networks, including failed, stuck and edge-case transactions.
Security review and fixes, a staged rollout with limits, monitoring and alerts, then ongoing updates as chains and providers change.
A new wallet or embedded wallet with defined scope
Fixed price after scoping.
For a clear piece of work: a mobile or browser wallet, an embedded wallet or a set of wallet integrations.
Custody model and scope agreed up front
Onboarding and signing flows designed first
Built and tested on testnets
Security review before launch
Hand-over or ongoing support
Mobile, backend and QA engineers on your product
Monthly, per engineer or team.
For products where the wallet is a living part of the platform with new chains, assets and features every quarter.
Engineers matched to your stack
Ownership of wallet app and backend
New chains and tokens added safely
Provider and SDK updates handled
Scale up for launches and migrations
We worked on the KickEX mobile crypto exchange, including its multi-currency wallet, transfers to external wallets and a reworked withdrawal flow. We bring the same mix of mobile, backend and security work to every wallet project.
We worked on KickEX, a mobile crypto exchange with a multi-currency wallet, real-time trading and withdrawals.
Native Android and iOS, cross-platform apps and the backend services behind them.
Payments, identity verification and third-party financial APIs.
Work can start in about two weeks.
85% of our customers come back with new work.
We settle who holds the keys before designing screens.
Transaction previews are designed, not left to raw data.
Stuck transactions, provider outages and lost devices all have a path.
Repositories, provider accounts and infrastructure stay with you.
Our engineers in Poland and Cyprus overlap with part of the US working day.
No sales pitch
Tell us about the wallet you need
Describe your product, users, chains and who should hold the keys. We'll suggest an approach and come back with a rough estimate.
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