The beta-4 testnet

The beta-4 network is the latest Fuel testnet. It builds on the foundation of beta-3, enhancing public P2P access, allowing parallel predicate execution, and introducing a newly redesigned bridging approach that ensures security for full rollups.

Ethereum contracts (Sepolia):

"FuelMessagePortal": 0x457A5a9320d06118764c400163c441cb8551cfa2

"FuelChainState": 0x053cDdc8D065dEB051584a5ae4DB45348be285c9

"FuelERC20Gateway": 0x10530552f00079cfF07f3c6D541C651a667Cf41D

Sepolia block explorer:

🚰 Faucet - Use the faucet to get test ETH to deploy contracts with or to interact with contracts. Available here:

📃 GraphQL endpoint - The Fuel Core node uses GraphQL instead of JSON RPC. A playground for the public GraphQL endpoint for beta-4 is available at

🔍 Block explorer - A block explorer (still heavily in development) is available at Be sure to select beta-4 from the dropdown on the top right.

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SDK Versioning

Version 0.55.0 or higher is the recommended version of the TS SDK on beta-4.

Version 0.47.0 or higher is the recommended version for the Rust SDK on beta-4.

Toolchain Configuration

To configure the optimal toolchain for beta-4, ensure you have fuelup installed, then run the following command:

fuelup self update

Then install the beta-4 toolchain with

fuelup toolchain install beta-4

This installs the following components and versions:

  • forc 0.45.0
  • forc-explore 0.28.1
  • forc-index 0.20.7
  • forc-wallet 0.3.0
  • fuel-core 0.20.4
  • fuel-indexer 0.20.7

To set the beta-4 toolchain as your default, run

$ fuelup default beta-4
default toolchain set to 'beta-4-aarch64-apple-darwin'


Messages intended for contracts use a pre-defined predicate as the message recipient. This predicate allows anyone to relay the message to the target contract and only the target contract. Once the contract receives the message it can see who originated it along with any special message payload and processes it accordingly. Since anyone can relay the message using this predicate it opens up possibilities for automated message processing as a service.

The predicate root for the beta-4 testnet is 0x86a8f7487cb0d3faca1895173d5ff35c1e839bd2ab88657eede9933ea8988815.