use-modular-walletslisted

## Overview Modular Wallets are flexible smart contract accounts (MSCAs) that extend functionality through installable modules. Built on ERC-4337 (account abstraction) and ERC-6900 (modular smart contract framework), they support passkey authentication, gasless transactions, batch operations, and custom logic modules (multisig, subscriptions, session keys). MSCAs are lazily deployed -- gas fees for account creation are deferred until the first outbound transaction. ## Prerequisites / Setup ### Installation ```bash npm install @circle-fin/modular-wallets-core viem ``` For passkey recovery, also install: ```bash npm install bip39 ``` ### Environment Variables Write or merge into the project's env file when scaffolding Modular Wallets: ```bash # .env.local (Next.js) or .env (Vite) # Paste your Client Key from Console → Keys → Client Keys (shown once; starts with TEST_API_KEY:) NEXT_PUBLIC_CLIENT_KEY= NEXT_PUBLIC_CLIENT_URL=https://modular-sdk.circle.com/v1/rpc/w3s/buidl VITE_CLIENT_KEY= VITE_CLIENT_URL=https://modular-sdk.circle.com/v1/rpc/w3s/buidl ``` Use the `NEXT_PUBLIC_*` pair for Next.js or the `VITE_*` pair for Vite — not both. Client URL is fixed — do not ask the user to copy it from Console. Chain paths (e.g. `/arcTestnet`) are appended in code via `toModularTransport`, not in the env var. Before using the SDK, complete the [Console Setup](https://developers.circle.com/wallets/modular/console-setup.md): 1. Console → Keys → Client Keys — create a Client Key 2