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Web3.Swift

Web3.Swift is an MIT-licensed Swift library that lets iOS and macOS applications connect to Ethereum through HTTP or WebSocket clients and perform blockchain queries and smart-contract interactions.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

Web3.Swift — OpenViST project profile in Developer Tools.
OpenViST project illustration. See the linked sources for product details.
Understand the project

Practical overview

When it fits

Use it when a Swift application needs Ethereum connectivity and its developers want library-level APIs for queries, contract interactions or token data.

Who it is for

  • Swift developers building Ethereum features into iOS or macOS applications.
  • Teams implementing contract calls, token data access or Ethereum account interactions in Swift.

Documented uses

  • Query Ethereum through an HTTP or WebSocket RPC client, including retrieving gas prices.
  • Encode smart-contract functions using Swift types and submit transactions.
  • Retrieve ERC-20 and ERC-721 token information, balances and transfer events.
  • Build app features involving ENS or use the library's ZKSync Era helpers.
Before you choose

Requirements & limits

The project is open source under the MIT license. Swift Package Manager is the documented installation method; CocoaPods is no longer supported.

  • An Ethereum HTTP or WebSocket RPC endpoint is required to create a client.
  • Account-backed transaction signing uses a key-storage provider; the maintainers recommend implementing a production provider rather than relying on the included local-storage example.
  • The README says ABI code generation is not supported, so contract functions must be represented using the library's ABI interfaces or another tool.
  • ERC-721 metadata decoding targets standard JSON, while the README notes that some contracts may not fully comply with the standard.

Check current requirements in the official documentation. Source-based guidance does not mean OpenViST has run or independently tested this project.

Source-based practical guide

Add Web3.Swift with Swift Package Manager

Add the library dependency to an Xcode project or Swift package.

Before you start

  • An Xcode project or Package.swift file.

Steps

  1. In Xcode, use File → Swift Packages to add the package, or edit Package.swift.

  2. For Package.swift, add .package(url: "https://github.com/argentlabs/web3.swift", from: "1.1.0").

Expected outcome

The project manifest or Xcode project includes Web3.Swift as a dependency.

Guide limitations

  • CocoaPods is no longer supported; the README recommends Swift Package Manager.
  • Adding the dependency does not configure an Ethereum RPC connection or account.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
Source record details
Source availability
Active
Sources checked
9 October 2026
Original website title
argentlabs/web3.swift · Official homepage title · retained in its source language
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