Wallet API Server

The Wallet API Server is a bi-directional JSON‑RPC 2.0 server that bridges a dApp (or service) with a Wallet (e.g., Ledger Wallet) over a trusted channel. It provides a structured way to exchange requests/responses and notifications while enforcing capability-based permissions.

Why use a server?

• Separation of concerns: your application logic stays in your process; the Wallet handles sensitive operations (accounts, signatures, device flows).
• Trust and permissions: the server formalizes capability requests and enforces what the dApp is allowed to do.
• Transport-agnostic RPC: JSON‑RPC 2.0 allows clear contracts and consistent error handling across transports (e.g., window.postMessage, WebSocket).

When to use it?

• You need a secure, permissioned bridge to a wallet (Ledger Wallet) from a dApp or integration.
• You want a consistent RPC contract across environments and transports.
• You prefer capability-based access over ad‑hoc messaging.

Where to start?

• Visual introduction
• API reference
• Constructor overview
• React hook (optional, useful if using react)
• Example using constructor
• Example within Ledger Wallet

External resources

• Source code: https://github.com/LedgerHQ/wallet-api/tree/main/packages/server 
• Main file: https://github.com/LedgerHQ/wallet-api/blob/main/packages/server/src/WalletAPIServer.ts 
• Wallet API README: https://github.com/LedgerHQ/wallet-api/blob/main/README.md 
• Spec: https://github.com/LedgerHQ/wallet-api/blob/main/spec/server/README.md 
• Package: @ledgerhq/wallet-api-server