Modules

Modules are the building blocks of modular wallets. Built on smart contract accounts (SCAs), they extend the business logic of Web3 applications. Each module provides a solution component for a new use case. You can enable specific modules in your app to meet specific business needs, such as automated transactions, subscription billing, or event-triggered actions when integrated with Circle Contracts. This makes USDC more programmable and enhances its role as a medium of exchange.

Note: Modules are built on Circle’s modular smart contract accounts (MSCA) technology and support the following standards:

• ERC-4337: Enables account abstraction, allowing operations without an initial Ether balance, improving flexibility.
• ERC-6900: Provides a framework for modular smart contracts that are customizable and extendable.

You can also create custom modules to expand the ecosystem based on this standard.

Supported modules

The table below lists the modules that are available:

Module Name	Description	Module Address
Address Book	Only allows you to transfer assets to a list of allowlisted addresses that is enforced onchain. Useful if you are building a vault for your treasury. • Add a list of address you allow sending ERC20, 721 or 1155 assets too • Any transfers of these assets outside that list of address will fail onchain	✅ Available: MSCA version: circle_6900_v1 Mainnet address: 0x0000000d81083B16EA76dfab46B0315B0eDBF3d0 Testnet address: 0x0000000d81083B16EA76dfab46B0315B0eDBF3d0