ArConnect and Arweave.app Wallet Interface Standard

The Arweave Wallet Interface Standard is the de facto browser-based API that governs how decentralized applications (dApps) on the permaweb connect to user wallets. Analogous to Ethereum's EIP-1193, this standard is not a formal ARC but an emergent convention defined by the two dominant wallet implementations: ArConnect and Arweave.app. It specifies the window.arweaveWallet JavaScript object injected into a web page's global scope, providing a strictly typed interface for requesting user accounts, signing transactions, and encrypting/decrypting data. For any front-end engineer building on Arweave, this API is the single point of integration for all user interactions with the network.

The standard defines a core set of asynchronous methods including connect(), disconnect(), getActiveAddress(), sign(), and signTransaction(), alongside an event system for listening to account changes ('walletSwitch') and disconnections. A critical operational detail is the API's versioning mechanism, which allows dApps to check for specific feature support and prevents breaking changes from immediately fracturing the ecosystem. The standard also specifies the ar:// protocol handler for deep-linking into wallet transaction previews, a feature essential for mobile and cross-application flows. Builders must understand the subtle behavioral differences between ArConnect's injected script and Arweave.app's iframe-based approach, particularly around permission scoping and how each wallet surfaces transaction tags to the user for approval.

For integration engineers and QA teams, the primary risk is assuming uniform behavior across wallets. A dApp that works perfectly with ArConnect may fail silently with Arweave.app if it does not correctly handle the connect() permission flow or if it relies on a method not present in the user's installed wallet version. Chainscore Labs helps teams audit their wallet integration layer against the full interface specification, build comprehensive test suites that simulate both wallet environments, and implement robust error-handling for cases where the window.arweaveWallet object is undefined or the user rejects a signature request. This review is especially critical before any mainnet deployment that involves token transfers, data uploads, or AO process interactions.

The ArConnect and Arweave.app Wallet Interface Standard is the de facto application-layer specification for how browser-based wallets expose an Arweave provider to decentralized applications. It is functionally analogous to Ethereum's EIP-1193, defining a strict API surface injected at window.arweaveWallet. This standard is not a consensus-layer protocol change but an opt-in convention that has achieved near-universal adoption across the permaweb ecosystem. The API mandates a set of asynchronous methods—including connect, disconnect, sign, signTransaction, and encrypt—that dApps call to request user authorization and cryptographic operations without ever gaining direct access to private key material.

The standard's event system and versioning semantics are critical for maintaining compatibility as wallets evolve. A walletSwitch event notifies dApps when a user changes their active wallet address, while a nodeChange event signals a switch in the gateway endpoint the wallet is configured to use. These events force dApp developers to build reactive state management that respects user intent, rather than caching a static connection. The API's permission model is connection-based: a dApp must first call connect with specific permissions (e.g., ACCESS_ADDRESS, SIGN_TRANSACTION) and receive explicit user approval before invoking protected methods. This creates a clear security boundary, but also introduces integration risk if dApps do not correctly handle cases where a user denies a connection or revokes permissions mid-session.

For builders and operators, the operational impact centers on the divergence between the standard's specification and real-world wallet implementations. Wallets may support different subsets of methods, handle encryption and decryption with varying algorithms, or implement non-standard behaviors for legacy RSA keys versus modern ECDSA (secp256k1) keys. Teams integrating Arweave wallets into exchanges, bridges, or cross-chain applications should audit their dApp's interaction with the injected API against the canonical ArConnect documentation, paying particular attention to error handling, permission scope requests, and the arweaveWallet namespace collision risk when multiple wallet extensions are installed. Chainscore Labs can assist with integration review and compatibility testing to ensure dApps gracefully handle the full spectrum of wallet behaviors encountered in the wild.