Fuel (FUEL): The Modular Ethereum Layer 2 for Developers

Layer 2 blockchain solutions have mushroomed over the past few years. As a result, developers have a solution for building efficient, low-cost and scalable decentralized apps (DApps), a phenomenon mainly driven by Ethereum's network congestion, poor scalability and high transaction costs. However, many of these Layer 2 networks continue to suffer from performance issues, albeit not to the extent of Ethereum’s (ETH) Layer 1 network. Some blockchain technicians have attributed such performance limitations to the monolithic nature of these platforms.

Fuel is a Layer 2 solution for the Ethereum blockchain that aims to address these problems by adopting a highly modular design and technical innovations such as parallelized transaction processing. Having started as an optimistic rollup, one of the first of its kind within the world of Ethereum, Fuel has evolved into a modular, high-performance execution layer designed to help developers build scalable DApps. While offering an efficient, high-performance execution layer, Fuel utilizes Ethereum's own data availability (DA) and consensus layers.

First introduced in 2020, the Fuel project entered a new era at the tail end of 2024 with the launch of its native token, FUEL, and a sharper focus on providing high-performance execution layer infrastructure.

Key Takeaways:

• Fuel (FUEL) is a blockchain project that offers a modular rollup development solution consisting of a high-performance execution layer and Ethereum Layer 1–based DA and consensus layers.

• The first modular rollup based on its solution is Fuel Ignition, launched in October 2024.

• Fuel's native crypto, FUEL, is used for securing a decentralized sequencer network through staking and stake delegation, validator reward payouts, gas fee payments, access to the platform's resources and application-specific staking.

What Is Fuel Network?

Fuel (FUEL) is a Layer 2-focused blockchain infrastructure project offering a high-performance modular execution layer while utilizing Ethereum’s Layer 1 DA and consensus layers.Fuel was initially launched in December 2020 as one of the earliest optimistic rollups for Ethereum. Over the next several years, the project’s team refocused their efforts on delivering a modular, scalable Layer 2 solution with its own execution layer, externalizing the DA and consensus layers.

The result of this new approach is the current Fuel network, sometimes referred to as Fuel V2, which acts as what the project has called an operating system for Ethereum rollups. In essence, Fuel V2 offers developers a convenient and flexible way to launch rollup networks and DApps that leverage Fuel's modular architecture principles — an internal and highly scalable execution layer interacting with Ethereum's DA and consensus layers.

Rollups developed using the Fuel framework will feature significant mutual interoperability, in addition to the core benefits of scalability, low costs and Ethereum-supported security. The project’s team launched the first of these Fuel-powered rollups, Fuel Ignition, in October 2024.

As of early 2025, Fuel is actively building an infrastructural ecosystem to support Fuel Ignition and other Fuel-based rollup networks. For instance, users can already take advantage of the platform's native wallet solution, Fuel Wallet, which lets them interact with DApps based on Fuel-powered rollup networks.

Fuel is also actively working on decentralizing its network to enhance security and performance. While a typical rollup solution uses a single sequencer node, a key network actor responsible for both block-building and proposing blocks to the underlying Layer 1, Fuel separates the roles of the builder and the proposer between distinct nodes. Fuel has already completed Phase 0 of its sequencer decentralization initiative, and operates 12 proposers and a single builder. Phase 1 will introduce multiple builders, along with around 100 proposers. The final stage of decentralization, Phase 2, is envisioned to feature as many as 10,000 sequencer proposers.

Source: docs.fuel.network

Fuel aims to be developer-friendly, and offers blockchain developers a toolbox called Fuel Orchestrator to facilitate easy scripting and deployment of smart contracts.

The project's developer is Fuel Labs, a Vancouver (Canada)–based blockchain development company founded by John Adler and Nick Dodson in 2019.

How Does Fuel Work?

Fuel-based rollups boast performance and security benefits, thanks to several technological innovations, particularly a modular design, a highly secure UTXO address model and parallelized transaction processing.

Fuel's technical advantages are based on architectural modularity. Most other rollups use Ethereum Layer 1 only for consensus, internalizing their execution and DA layers. Sidechains, another popular Layer 2 network type besides rollups, often keep all three blockchain layers under the hood. Such monolithic designs may limit scalability or security — or both.

In contrast, Fuel internally handles only the execution layer, allowing the overall platform to remain highly flexible and adaptable. Some other modular rollups adopt the same approach, but they often outsource their DA layers to partnering DA providers, many of which are small projects with less established security profiles. Fuel, on the other hand, utilizes Ethereum Layer 1 directly for both DA and consensus. Since Ethereum is one of the industry's most secure and decentralized platforms, Fuel's overall modular setup enjoys high levels of security.

Another key security advantage of Fuel stems from its UTXO transaction model. While Ethereum and many Ethereum-linked Layer 2 chains employ an account-based model, Fuel utilizes a UTXO setup in which each network address contains unspent amounts from earlier transactions, and each transfer represents an exchange of these unspent funds. First implemented by Bitcoin’s blockchain, UTXO is regarded as more secure than Ethereum's account-based model, particularly with regard to protections from double-spending.

Parallel Transaction Execution

Fuel's UTXO model also features another critical performance advantage — namely, support for parallel transaction processing. At runtime, Fuel's processing engine determines which transactions don't overlap, in terms of the addresses and UTXO amounts involved. Non-overlapping transactions are then processed in parallel, delivering significant scalability and throughput advantages.

FuelVM

FuelVM is the platform's processing engine. Fuel's virtual machine (VM) is a register-based system designed to optimize performance and parallelized transaction execution. Register-based VMs are one of the two most popular types of VMs, along with stack-based systems like Ethereum virtual machine (EVM). Within a stack-based VM, data is stored in and retrieved from a temporary memory stack during transaction processing. In such systems, data pieces are stored and accessed in a last-in, first-out (LIFO) fashion, creating performance bottlenecks, such as a need for frequent instructions or a lack of direct access.

In contrast, a register-based system such as FuelVM processes data pieces held in registers — separate labeled storage areas. Such a design delivers performance benefits in the form of fewer instructions, enabling a more straightforward implementation of parallelized processing.

Sway

Sway is a programming language for writing Fuel-based smart contracts. It's a domain-specific language, adapted to the needs of blockchain developers. Sway is based on Rust, a popular general-purpose programming language that emphasizes performance and concurrent processing. Since Fuel heavily leverages parallelized processing in order to achieve its scalability and throughput benefits, the Rust-based Sway is an optimal language for the Fuel platform's smart contracts.

While Sway has inherited many of Rust's properties, Fuel Labs has specifically adapted it for blockchain-based smart contract development. As such, blockchain development with Sway is typically easier and more efficient than using Rust.

Fuel Key Features

Fuel Ignition

Fuel Ignition is the first rollup network to leverage FuelVM. We noted earlier that Fuel is essentially a high-performance execution layer that developers can leverage to launch custom rollups. Theoretically, many different Ethereum-linked rollup chains can utilize Fuel and become part of the platform's ecosystem. Fuel Ignition represents the first step in this direction.

Fuel Ignition features one-second block times and gas fees that are small fractions of a cent. According to the project's public communications, transaction fees on Fuel Ignition can be lower than $0.0002. The Fuel Ignition Layer 2 chain utilizes Ethereum's DA layer. It optimizes the cost and efficiency of data processing on the underlying Layer 1 through the implementation of EIP-4844, an experimental Ethereum feature that uses bundles of data called "blobs," instead of standard transactions.

Fuel Ignition boasts a throughput of over 600 transactions per second (TPS) on the Ethereum DA layer. It also features a high TPS per CPU core, with a throughput of 21,000 TPS per CPU. With parallelized processing and high TPS per core, Fuel Ignition is ideally suited for mass adoption on consumer hardware.

Another distinct feature of Ignition is its nearly universal support for Ethereum and Solana (SOL) native wallets. As of early January 2024, the blockchain already has over 60 live DApps operating on it in areas ranging from decentralized finance (DeFi), non-fungible tokens (NFTs) and oracles to education, gaming and more.

FuelProver

FuelProver is the platform's hybrid proof-generation solution that combines the features of optimistic fraud proofs and zero-knowledge (ZK) validity proofs. Rollups pass these proofs along with blocks of transactions to the underlying Layer 1 chain to help validate transaction data. Optimistic rollups generally offer lower computational overheads, while ZK-rollups feature greater security. FuelProver is envisioned to combine the benefits of the two rollup types, helping developers integrate Fuel's execution layer into both varieties.

What Is the FUEL Token?

Fuel's native cryptocurrency, FUEL, is an ERC-20 token issued on the Ethereum blockchain in December 2024. One of the token's key functions is to support the project's decentralized sequencer network, which is based on the proof of stake (PoS) validation method. The network utilizes FUEL to secure its operations via staking and stake delegation. Sequencers are rewarded in FUEL for their transaction processing activity. Other platform users can delegate FUEL to preferred sequencers to earn a share of the rewards.

Developers pay in FUEL to utilize the platform's resources, such as access to DA. Gas fees on the sequencer network are also paid in FUEL tokens.

The FUEL token is also used for Application Specific Sequencing, whereby users can bond their FUEL to a specific DApp and earn staking rewards from that application.

FUEL has a total supply of 10 billion, with an annual supply inflation of 3%. The image below details the token’s distribution:

Source: docs.fuel.network

The Fuel project has announced a genesis airdrop campaign, during which 10% of the FUEL supply (1 billion tokens) will be distributed to more than 200,000 eligible addresses. Recipients include various groups of early adopters, including testnet users, holders of NFTs on Fuel Ignition, those bridging funds to the blockchain, active gas users and open-source code contributors. The airdrop is active between Dec 19, 2024 and Jan 19, 2025.

Where to Buy the FUEL Token

The FUEL token can be purchased as Spot pair (FUEL/USDT) or as a Perpetual contract (FUELUSDT) on Bybit. As of Jan 7, 2024, FUEL is trading at $0.067, which is 19.8% lower than its ATH of $0.08375 on Dec 29, 2024 and 78.5% higher than its ATL of $0.03762 on Dec 20, 2024.

Until Jan 14, 2025, 8AM UTC, you have the chance to share in 9,300,000 FUEL by embarking on Bybit’s Puzzle Hunt! To earn FUEL rewards, start by registering for the Puzzle Hunt event. Then, collect puzzle pieces either by completing simple daily tasks or receiving the pieces from your friends. If you complete three consecutive puzzle pieces, you can earn achance at a lucky draw to unlock even more FUEL rewards. Additionally, be among the first 600 participants to complete the entire puzzle, and you can claim 5,000 FUEL!

Closing Thoughts

Fuel’s network offers developers a unique environment in which to spin off Ethereum rollups. The developer toolchain — featuring Fuel Orchestrator, the Sway programming language and the parallel processing–capable FuelVM — offers outstanding tools that, along with the platform's high throughput capacity and modular design, make the job of launching high-performance rollups that much easier. As Fuel progresses in 2025, the project’s team is determined to keep its focus on serving the developer community, and strives to promote collaboration, innovation, education, creativity and efficiency in all matters related to blockchain rollup development.

#LearnWithBybit