ERC-1820: The Universal Registry Standard

Introduction to ERC-1820

ERC-1820 is an Ethereum standard designed to provide a universal registry of smart contracts, enabling them to dynamically identify the interfaces implemented by other contracts. This solves the problem of static interface detection, allowing for more flexible and scalable interactions within the Ethereum ecosystem.

Key Features of ERC-1820

Universal Registry

ERC-1820 establishes a central registry where smart contracts can register the interfaces they implement. This registry allows contracts to query the registry to discover what interfaces another contract supports, enhancing interoperability and reducing the need for hardcoding interface logic.

Dynamic Interface Discovery

By enabling dynamic discovery of interfaces, ERC-1820 allows contracts to interact more flexibly with one another. This means that as new standards and interfaces are developed, contracts can adapt without needing to be redeployed or rewritten.

Simplified Interactions

The registry simplifies contract interactions by providing a standardized way to check for interface support. This reduces the complexity of developing contracts that need to interact with a variety of other contracts, promoting a more modular and reusable approach to smart contract development.

How ERC-1820 Works

Registration Process

Contracts can register the interfaces they implement using the setInterfaceImplementer function. This function associates a contract with a specific interface, which can then be queried by other contracts.

Interface Querying

To check if a contract supports a particular interface, the getInterfaceImplementer function is used. This function queries the registry and returns the address of the contract that implements the interface, if available.


ERC-1820 relies on a simple and efficient implementation that minimizes gas costs and maximizes compatibility with existing standards. It includes utility functions and a minimal set of operations necessary to manage the registry.

Benefits of ERC-1820

Enhanced Interoperability

ERC-1820 enhances interoperability between smart contracts by providing a standardized method for interface discovery. This is particularly useful in complex ecosystems where multiple standards and contract types need to interact seamlessly.

Flexibility and Scalability

By supporting dynamic interface discovery, ERC-1820 enables contracts to remain flexible and scalable. This adaptability is crucial as the Ethereum ecosystem evolves and new standards emerge.

Reduced Development Complexity

The standardized registry simplifies the development process by eliminating the need for custom interface detection mechanisms. This reduces the potential for errors and makes it easier to develop and maintain complex contract systems.

Use Cases for ERC-1820

Token Standards

ERC-1820 is particularly useful for token standards such as ERC-777, which relies on ERC-1820 for interface detection. This ensures that token contracts can interact smoothly with other contracts that support the necessary interfaces.

Modular Contract Systems

In modular contract systems where different modules need to interact dynamically, ERC-1820 provides the necessary infrastructure for efficient communication and interaction between modules.

Upgradable Contracts

ERC-1820 supports the development of upgradable contracts by allowing new interfaces to be registered and discovered as needed. This makes it easier to introduce new functionality and maintain compatibility with existing contracts.


ERC-1820 is a pivotal standard in the Ethereum ecosystem, providing a universal registry that enhances interoperability, flexibility, and scalability of smart contracts. By enabling dynamic interface discovery, ERC-1820 simplifies contract development and promotes a more modular and adaptable approach to smart contract design. As the Ethereum ecosystem continues to grow, the importance of standards like ERC-1820 will only increase, ensuring a robust and interconnected blockchain environment.

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