Crypto Wallet Development for Web3 Products

Which wallet model fits your product and users?

The right wallet model is the one whose control, recovery and operating responsibilities match the product—not simply the one with the shortest onboarding. We begin by documenting who controls keys, what users need to do, and which responsibilities belong to your team or a provider.

A non-custodial wallet is designed around users controlling their own keys. Its product plan must account for setup, transaction approval and clear recovery guidance. A custodial wallet places key management within an operating model managed by the product or its provider, so responsibilities and the applicable regulatory classification need early attention. Your counsel should review that classification before launch.

Bring these decisions to the first review:

• Who is the primary user, and what is their first meaningful wallet action?
• Which account setup and recovery experience is expected?
• Will the wallet support transfers, swaps, or both?
• Which markets and operating responsibilities need counsel's review?

We record agreed assumptions in a Mandate Letter so design and engineering work from the same product boundary. If wallet activity is one part of a broader application, we can align the scope with dApp development or smart contract development.

How do key management and security shape wallet design?

Key management affects the user experience, operating model and security review, so it must be settled before implementation details harden. We map the intended approach to account creation, authorization, recovery and support scenarios, then use that map to guide the product and technical design.

For each critical action, the team should be able to explain what the user sees, what the wallet is expected to do, and what happens if the action cannot complete. This applies to initial setup, transaction approval, recovery instructions and any administrative workflow in a custodial product. We also identify integrations and backend responsibilities that need explicit ownership.

Our preparation can include:

• A key-management decision record with open questions assigned to the client or counsel.
• A flow inventory for onboarding, signing, recovery and support.
• Integration boundaries for the wallet, backend and monitoring components.
• An audit-preparation checklist organized around the agreed implementation scope.

A Quality Gate checks that the agreed flows, implementation scope and review materials are aligned before the work moves forward. It does not replace an independent security audit; it makes the intended product and the material available for review easier to assess. When token behavior is part of a transaction flow, coordinate the wallet scope with token creation and deployment.

What should multi-chain, transaction and swap scope include?

A wallet's chain list is only useful when each supported network has a defined user purpose and a planned transaction journey. We translate the product requirement into a bounded integration scope instead of treating multi-chain support as a checkbox.

For each requested network, identify the actions users must complete, the relevant transaction states, and any backend or monitoring work needed by the product. For swaps, clarify the intended user path and which integration responsibilities belong to the wallet, backend or a third party. The brief should also distinguish essential launch flows from capabilities that can wait for a later release.

Delivery surface changes the design work:

• Browser extension: define how users enter the wallet, review an action and return to the product.
• Mobile wallet: specify the core screens, supported flows and connection with any existing app.
• Telegram Mini App: set the wallet journey within the product's Telegram experience and make account and transaction steps explicit.

We document each surface and flow in the project scope so engineering and client reviewers can work against the same acceptance points. If your product needs a Telegram experience beyond the wallet itself, consider Telegram bot and Mini App development; for a dedicated application, see mobile app development.

How does a wallet project move from scope to release?

A wallet project progresses through defined decisions, implementation and review, with the client able to see what is ready and what remains open. The exact schedule follows the selected surfaces, chains, integrations and review requirements rather than a fixed calendar promise.

We start by confirming product goals, custody assumptions, users, required flows and client-side dependencies. The design and technical scope then identify the work to deliver, integration responsibilities and review materials. During implementation, we keep decisions and unresolved items visible so the client can respond before they block a flow or release preparation.

A Compliance Review is used to record questions requiring the client's counsel or other designated reviewer, particularly for custodial products. It is not a substitute for legal advice. Before release preparation, our review checks the agreed scope against the implemented flows and records known handoffs, pending client inputs and audit-preparation materials.

To keep governance practical, we can maintain a Governance File containing approved scope, decision records, review notes and release responsibilities. Your team should nominate a decision-maker, provide timely access to required systems, and identify who signs off on product, technical and compliance questions. For an overview of how development fits the wider delivery model, see Web3 development.

What should the client prepare for a wallet build?

A clear kickoff packet helps the team estimate the real engineering boundary and reduces avoidable redesign. You do not need every answer finalized, but the unknowns should be named and assigned before implementation begins.

What we prepare:

• A scope outline covering wallet type, delivery surface, chains and required user actions.
• A flow and integration map that identifies product, backend and third-party responsibilities.
• Review checkpoints for security, compliance questions and release preparation.
• A delivery record that distinguishes completed work, open decisions and client handoffs.

What the client provides:

• Product goals, target users and any existing product or technical documentation.
• The desired custody approach, supported networks and priority transaction or swap flows.
• Available designs, brand assets, integration details and access to relevant environments.
• A named product decision-maker, technical contact and counsel or compliance reviewer where applicable.

The scope can begin with an MVP and leave clearly separated items for later phases; that keeps launch-critical journeys distinct from future features. If the wallet is part of a larger product, share the related Web3 development requirements and any website or landing requirements at kickoff. Send us your product brief, preferred wallet surface, custody assumptions and target flows. MegaSatoshi will review those materials, identify the decisions needed to scope the build, and return a proposed project outline.

What can affect a wallet's release and security review?

A useful release plan separates the work your team can approve from outcomes controlled by external systems or reviewers. This makes the wallet scope more actionable and prevents a technical delivery plan from being mistaken for legal or security sign-off.

Before implementation, record dependencies such as network integrations, third-party services, client-provided environments and any external review required for launch. Assign an owner to each dependency and decide what the product should show users if a connected service is unavailable. Keep those decisions in the project record alongside the approved transaction flows.

For custodial products, ask counsel to review regulatory classification before launch and document who owns that review. Plan independent security review and audit preparation as explicit workstreams, with access, materials and remediation ownership agreed in advance.

Wallet execution can be affected by the selected network and external integration availability, while legal classification and an independent auditor's conclusions are not controlled by the development team. We can deliver the agreed wallet implementation and review materials, but cannot determine counsel's classification or promise an external audit outcome.

Prices

Starting prices in USD. Custom bundles and volume discounts on request. Payment in USDT, USDC, BTC, ETH, SOL, TON or your project token.

How it works

1. Confirm the mandateShare the product brief, intended users, custody assumptions and target wallet surface. We document goals, scope boundaries and decisions that require client or counsel input.
2. Map flows and integrationsWe specify the required account, transaction, swap and recovery journeys, then assign integration and backend responsibilities for the agreed networks.
3. Design and implementThe team develops the approved wallet experience and technical scope, keeping open decisions and client dependencies visible during delivery.
4. Review and prepare releaseWe check the implementation against the agreed flows, organize review materials and record outstanding handoffs for client approval and release planning.