BuildAWallet is a dual-purpose platform that lets humans design self-custody wallets and gives AI agents paid API access to mainnet data. It separates personal financial control from automated machine operations. This guide covers wallet design, agent endpoints, policy-controlled signing, customization, and infrastructure.
Crypto Wallet Design
Traditional wallets force users into a single interface. BuildAWallet changes this by allowing users to build a wallet from scratch. The platform provides a Wallet Studio where you define the structure before you even create your keys. This approach ensures the tool fits your specific asset strategy rather than forcing you to adapt to a generic app.
Local Key Derivation
Self-custody is the core principle here. Your private keys are generated and stored locally on your device. The platform does not hold your recovery phrase. This design ensures that even if the service goes offline, you retain full access to your funds. The setup process guides you through naming your wallet and confirming your identity via email, but the cryptographic keys remain on your hardware.
Blueprint Approach
Instead of a one-size-fits-all app, you create a blueprint. You choose which networks to support, which assets to display, and how the interface looks. This is particularly useful for users who hold assets across multiple chains like Ethereum, Base, and Solana. You can create a dedicated wallet for stablecoins and another for DeFi, keeping your mental model clean and your security posture tight.
Agent Endpoints
BuildAWallet is not just for humans. It provides a machine-native interface for autonomous agents. The API explorer documents every endpoint available to developers. These endpoints allow agents to read balances, check transaction statuses, and prepare transfers without human intervention. This is critical for building automated financial workflows.
Prepaid API Units
Access to these endpoints is metered. You purchase blocks of API units that last for 30 days. The pricing page details the available tiers. This model ensures that agents pay for the compute and data they consume. It prevents runaway costs and provides a clear budget for your automated systems. Unused units roll over if you renew before expiry, giving you flexibility in your spending.
Machine Payment Flow
Agents can pay for their own API access. The flow involves discovering plans, creating a wallet, and paying with a supported asset like USDC on Base or Solana. This removes the need for a human to manage the agent's billing. The agent signs the payment transaction, verifies it, and receives its API credential. This is a fully automated onboarding process for machine users.
Policy Controlled Signing
Security is paramount when dealing with automated agents. Policy-controlled signing allows you to define rules for how transactions are approved. You can set limits on transaction amounts, restrict which contracts can be interacted with, and require multi-signature approvals for large transfers. This layer of control ensures that an agent cannot drain your wallet without adhering to your predefined safety rails.
Local Signing vs Server Signing
By default, signing happens locally on your device. This means the private key never leaves your hardware. For agents, you can opt into a server-generated wallet for convenience, but you must explicitly accept the risk. The privacy policy clearly outlines how keys are handled. It emphasizes that the platform does not store your recovery phrases in a way that allows them to be retrieved later. This transparency is essential for building trust in a self-custody environment.
Abuse Prevention
The platform includes mechanisms to prevent replay attacks and unauthorized access. Session tokens are hashed and stored securely. Challenge records are used to verify that the entity requesting a transaction is the same one that created the wallet. These technical safeguards are built into the core of the platform, not added as an afterthought. They provide a robust foundation for secure agent operations.
Crypto Wallet Customization
Customization in BuildAWallet goes beyond changing colors. You can define the entire user experience. The Android build allows you to configure app details, including the package ID and biometric unlock settings. You can block screenshots to prevent screen capture of your balances. You can also choose how explorer links open, ensuring that transaction details open in your preferred browser. This level of control is rare in the crypto wallet space.
Style and Layout
Power-ups
Agent Compatible Infrastructure
BuildAWallet is built to be discovered by machines. It provides standard machine-readable entry points for agents to interact with the service. The MCP server setup allows AI clients to connect directly to the platform. This means that agents can discover the available tools, inspect plans, and call capabilities programmatically. This infrastructure is essential for the emerging machine internet.
Machine-Readable Discovery
The platform exposes several files for machine discovery. These include an agent-readable service guide, a machine offer manifest, and an OpenAPI 3.1 contract. These files allow agents to understand the service's capabilities without human intervention. They can inspect the available endpoints, check the pricing, and determine how to authenticate. This standardization makes it easy for any compliant agent to integrate with BuildAWallet.
Streamable HTTP Interface
The MCP endpoint uses a streamable HTTP interface with JSON-RPC 2.0. This allows for real-time communication between the agent and the platform. The agent can send requests and receive responses in a continuous stream. This is more efficient than traditional request-response models for certain types of operations. It enables complex workflows where the agent needs to make multiple calls in sequence.
Key Takeaways
- BuildAWallet is a dual-purpose platform for humans and AI agents.
- Humans can design custom self-custody wallets with local key storage.
- Agents can access paid API endpoints for mainnet data and transactions.
- Policy-controlled signing provides security rails for automated operations.
- The platform offers extensive customization for style, layout, and features.
- Machine-readable discovery files allow agents to integrate seamlessly.
- Prepaid API units provide a clear and predictable cost model for agents.
- Privacy is a core focus, with no sale of personal data or cross-context advertising.
Frequently Asked Questions
What is BuildAWallet?
BuildAWallet is a platform that allows users to design their own self-custody crypto wallets and provides paid API access for autonomous agents.
Does BuildAWallet hold my private keys?
No. BuildAWallet is self-custody software. Your keys are generated and stored locally on your device. The platform does not take custody of your wallet keys or funds.
How do agents pay for API access?
Agents can pay for API access using supported assets like USDC on Base or Solana. They purchase prepaid units that last for 30 days.
Can I customize the wallet interface?
Yes. The Wallet Studio allows you to customize the style, layout, colors, navigation, and assets displayed in your wallet.
What is policy-controlled signing?
Policy-controlled signing allows you to define rules for how transactions are approved, such as limits on amounts or restricted contracts.
Is BuildAWallet compatible with AI clients?
Yes. The platform provides an MCP server that allows AI clients to discover and call tools directly.
How does the privacy policy protect my data?
BuildAWallet does not sell personal information or share it for cross-context behavioral advertising. It minimizes data collection and does not use advertising pixels.
Conclusion
BuildAWallet bridges the gap between personal financial management and automated agent operations. It provides the tools for humans to take control of their crypto assets and for agents to interact with the blockchain securely. If you are ready to build your own wallet or explore agent APIs, visit BuildAWallet to get started.