How Ethereum 2.0 Transformed DeFi: The Merge to Fusaka and Its Impact in 2026

Ethereum 2.0 was the original name for Ethereum's move to proof of stake and a faster, cheaper network, and its impact on DeFi is now measurable rather than expected. The Merge (September 2022) cut energy use by about 99.95% and made staked ETH a core DeFi asset; Dencun (March 2024), Pectra (May 2025) and Fusaka (December 2025) then pushed layer 2 fees to fractions of a cent, added smart-account features to ordinary wallets and multiplied blob space for rollups. Ethereum still holds about 56% of all DeFi value, roughly $50 billion of $90 billion as of October 2026.

The name itself is retired. In January 2022 the Ethereum Foundation stopped using "Eth2" and now calls the two halves the execution layer and the consensus layer. People still search for "Ethereum 2.0", though, and there is still no separate "ETH2" coin to buy; any token sold under that name is a scam.

This guide keeps the term because it is what readers look for, then shows what each upgrade actually changed for decentralized finance: fees, layer 2 data costs, staking and account abstraction. It closes with a builder's checklist for DeFi teams launching on Ethereum in 2026.

Key Takeaways

• Ethereum 2.0 is finished as a brand, not as a roadmap. The proof of stake switch happened at the Merge on 15 September 2022; later upgrades (Shapella, Dencun, Pectra, Fusaka) carried on the same scaling plan under their own names.
• Fees fell where DeFi users actually trade. A June 2026 study measured Ethereum mainnet median fees falling from over $2 to under $0.02, and layer 2 median fees from $0.05 to $0.0015, between January 2024 and March 2026.
• Staking became DeFi's base layer. About 43.7 million ETH, roughly 35.8% of supply, is staked, and liquid staking protocols hold about $55.7 billion on DefiLlama, with Lido at about $23.8 billion.
• Pectra changed wallets. EIP-7702 lets a normal address run smart-account code, enabling gas sponsorship and batched DeFi actions, and also a new phishing vector that builders must design against.
• Fusaka scaled rollups, not mainnet fees. PeerDAS and two blob-parameter forks raised blob capacity from a target of 6 to 14 per block by January 2026; Glamsterdam is next, targeted for Q4 2026.

What is Ethereum 2.0?

Ethereum 2.0, also known as ETH 2.0, Eth2 or Serenity, was the umbrella name for a set of upgrades designed to improve Ethereum's scalability, security and sustainability. The core change was the transition from a Proof of Work (PoW) consensus mechanism to Proof of Stake (PoS), which removed energy-hungry mining and replaced it with validators who lock up ETH.

The original plan also included 64 shard chains that would split the network into parallel pieces. That design was dropped. Instead, Ethereum adopted a rollup-centric roadmap: layer 2 networks such as Base, Arbitrum and Optimism execute transactions and post compressed data back to Ethereum, and the main chain is upgraded to carry that data cheaply. Ethereum.org now describes this as danksharding, delivered in steps rather than as one "2.0" launch.

So when people ask about the impact of Ethereum 2.0 on DeFi in 2026, they are really asking about five upgrades. Here is the timeline.

The Upgrade Timeline: From Beacon Chain to Glamsterdam

Sources: ethereum.org on the Merge, Dencun, Pectra, Fusaka, EIP-8135 for the BPO2 parameters and the Glamsterdam status page, which lists mainnet as "Q4 2026, date not yet confirmed" after a Sepolia testnet fork on 6 October 2026.

Key Features of Ethereum 2.0

These upgrades introduced changes to the network's architecture and consensus mechanism. Together they keep Ethereum the main settlement layer for decentralized applications (dApps) and DeFi, even as rival chains have grown.

1. Proof-of-Stake (PoS)

The most significant change is the transition from Proof-of-Work (PoW) to Proof-of-Stake (PoS). Unlike PoW, which requires miners to solve puzzles with energy-intensive hardware, PoS relies on validators who "stake" ETH to secure the network. Validators are chosen at random to propose and attest to blocks, weighted by their effective balance, and they lose part of their stake ("slashing") if they act dishonestly.

This transition delivered three results:

1. Energy Efficiency: Ethereum.org puts the energy reduction from the Merge at roughly 99.95%, which removed a major objection from institutional allocators.

2. Decentralization, with caveats: Anyone with 32 ETH can run a validator, and pools let smaller holders join. In practice, a few liquid staking providers and exchanges control a large share of stake, which the community tracks closely.

3. Economic Security: With about 43.7 million ETH staked as of early October 2026 (PrimeXBT, citing beaconcha.in data), an attacker would need to acquire and risk tens of billions of dollars of ETH.

2. Scalability Through Sharding, Now Rollups and Blobs

Sharding was meant to be the core of the original scaling plan. The idea survives, but in a different form. Instead of splitting execution into shard chains, Ethereum gives rollups a separate, cheap data lane called blobs. Each blob holds about 128 KB of data that nodes keep for roughly 18 days, long enough for anyone to verify a rollup's state.

The benefits are now measurable:

1. Increased Throughput: On 15 October 2026, growthepie counted about 1.86 million transactions on Ethereum mainnet (about 21 per second) and about 31.7 million across the layer 2s it tracks (about 367 per second). The old promise of "tens of thousands of TPS" on mainnet never arrived; the scale comes from rollups.

2. Reduced Latency: Slots are 12 seconds on mainnet, but layer 2s confirm transactions in well under a second, which matters for trading and liquidations.

3. Enhanced Capacity for dApps: Fusaka's PeerDAS lets nodes sample blob data instead of downloading all of it, so blob capacity could rise from a target of 6 per block to 14 within five weeks of the upgrade.

3. Enhanced Security

Security is paramount in DeFi, where billions of dollars sit in smart contracts. Proof of stake gives validators strong economic incentives to act honestly, and slashing creates a direct penalty for attacks. Protocol-level security is only one layer, though. Most DeFi losses still come from contract bugs, oracle manipulation and stolen keys, so audits remain essential.

4. Reduced Transaction Costs

High gas fees were the biggest barrier to DeFi adoption in 2021, often pricing out smaller users. The PoS switch alone did not lower fees; capacity did. A June 2026 paper by Ambrosia and Mizrach, Transaction Costs and Speed in the Ethereum Ecosystem, found that from January 2024 to March 2026 mainnet median fees fell from over $2 to under $0.02, and layer 2 median fees fell more than 95%, from $0.05 to $0.0015.

Fees still move with demand. Growthepie's median mainnet transaction cost was about $0.004 on 18 July 2026 and about $0.055 on 15 October 2026, while Base stayed near $0.002 and Arbitrum near $0.005.

How Ethereum 2.0 Impacts DeFi

The upgrades did not change what DeFi does; they changed who can afford to use it and where it runs. Each impact below now has data behind it.

Improved User Experience

DeFi platforms were criticised for slow, expensive transactions during peak periods. Today a swap on a layer 2 costs a fraction of a cent and confirms in under a second. Pectra's EIP-7702 adds the next step: an ordinary wallet can temporarily run smart-account code, so a dApp can sponsor gas, batch "approve and swap" into one click, or let users pay fees in stablecoins.

Increased Liquidity, Mostly on Ethereum and Its Rollups

Liquidity is the lifeblood of DeFi. On 15 October 2026, DeFi held about $90.0 billion in total value locked, and Ethereum mainnet alone held about $50.3 billion of it, a 55.8% share, according to DefiLlama's chain rankings. Base ($6.2 billion) and Arbitrum ($1.4 billion) add more. L2BEAT puts the total value secured by Ethereum rollups at about $41.4 billion. Explore where that liquidity trades in Pixel's guide to the top decentralized exchanges.

Staking Became a DeFi Primitive

This is the impact early Eth2 articles underestimated. Staked ETH turned into a yield-bearing asset that DeFi could build on. Liquid staking tokens such as Lido's stETH are now among the most used collateral types in lending markets; DefiLlama shows liquid staking protocols at about $55.7 billion, restaking at about $10.0 billion and Aave V3 at about $17.2 billion as of 16 October 2026.

The yield is modest. Lido's API reported a seven-day average stETH APR of about 2.2% in mid-October 2026. That rate sets a floor: DeFi protocols on Ethereum now compete with "native" staking yield, so lending and liquidity pools must pay more than about 2% to attract ETH. Pixel's comparison of staking, yield farming and liquidity mining explains how these returns stack.

Better Accessibility

High transaction costs used to exclude small investors. At under one cent per layer 2 transaction, a $20 swap or a $50 loan repayment is now economical. Passkey support from Fusaka (EIP-7951) also lets wallets sign with a phone's secure chip, removing seed phrases for many first-time users.

Expansion of Use Cases

Cheaper blockspace unlocked resource-intensive DeFi use cases that were impractical in 2021: on-chain order books, perpetual futures, intent-based trading, tokenized treasuries used as collateral, and payment apps built on stablecoins. Pixel's analysis of the top DeFi trends tracks which of these are growing fastest in 2026.

Enhanced Security for Financial Transactions

With roughly $50 billion locked in Ethereum DeFi, security is non-negotiable. PoS makes a 51% attack on Ethereum prohibitively expensive. The new risk sits at the account layer: in the first weeks after Pectra, Wintermute found that more than 80% of EIP-7702 delegations pointed to copy-pasted "sweeper" contracts used to drain compromised wallets. Wallets and dApps now need clear signing screens for delegation requests.

Upgrade by Upgrade: What Actually Changed for DeFi

Most articles on this topic still describe 2020 promises. This table shows outcomes, with the metric to watch for each upgrade.

The cost side for rollups is striking. Growthepie data shows the layer 2s it tracks paid Ethereum about $90,000 in total data and settlement costs in the 30 days to 15 October 2026, and only about $8,500 of that was blob fees. Before Dencun, rollups paid for the same job with expensive calldata.

Integrating Ethereum 2.0 in DeFi Development

The real benefit of these upgrades shows when developers use their features in decentralized finance platforms. Here is how they change a DeFi startup's journey in 2026.

Lower Development Barriers

Startups used to spend months designing around gas costs. On a rollup, contracts can store more state and run more logic per transaction without pricing users out. The trade-off is that teams must now choose a rollup, a bridge and a data availability setup, which adds architecture decisions. Pixel's layer 2 blockchain solutions team helps teams make that choice.

Competitive Advantage

Early adoption of new features still pays. Protocols that shipped 7702 batching, passkey login or gasless onboarding in 2025 and 2026 offer a smoother first trade than rivals that still need several pop-ups and ETH for gas. Ethereum's mature tooling, audited libraries and deep stablecoin liquidity also remain advantages over newer chains.

Enhanced Security and Credibility

Security is a deciding factor for DeFi users and institutions. Building on Ethereum gives a project the most battle-tested settlement layer, a large auditor community and established standards such as ERC-20 and ERC-4626 vaults. If your protocol needs its own asset, Pixel's Ethereum token development service builds ERC-20 and related tokens with audited code.

Innovation Opportunities

Lower costs and new account features let startups explore cross-chain intents, decentralized derivatives, restaking-based services and tokenized real-world assets as collateral. Each of these was too expensive or too clumsy on 2021 mainnet.

Greater Focus on User Experience

With the protocol handling more of the scaling work, teams can spend more on interfaces, education and support. Smart-account features mean a DeFi app can now behave like a fintech app: one tap, sponsored fees and recovery options.

Challenges and Considerations in Creating Ethereum 2.0 Integrated DeFi Applications

The transition is over, but new challenges replaced the old ones. Here is what to plan for when building DeFi on Ethereum today.

Upgrade Cadence Instead of a Transition Period

There is no longer an "Ethereum 1.0 versus 2.0" period to manage. Instead, Ethereum now ships a hard fork roughly once a year plus smaller blob-parameter forks. Each one can change gas costs (Glamsterdam reprices several operations), so teams should test contracts on public testnets such as Sepolia and Hoodi before each fork.

Validator Costs and Staking Design

Running a validator still requires 32 ETH, about $78,000 at the CoinGecko price of roughly $2,450 on 16 October 2026. Pectra raised the maximum effective balance to 2,048 ETH, which helps large operators but not small ones. Startups usually integrate staking pools or liquid staking tokens instead, which adds smart contract and depeg risk that must be priced into collateral factors.

Liquidity Fragmentation Across Layer 2s

Cheap rollups split liquidity. The same token can trade on a dozen layer 2s with different prices and bridges, so a new protocol must decide where to launch and how to connect its pools. Interoperability standards are improving, but fragmentation is still the main user complaint in 2026.

Market Competition

As fees fall, the DeFi space grows more competitive. Solana, Hyperliquid's own chain and BNB Chain all compete for the same traders. Startups need a clear niche, strong security and real yield rather than token emissions to stand out.

A DeFi Builder's Checklist for Ethereum in 2026

Use this checklist before you commit to an architecture:

1. Pick the settlement layer by user, not hype. High-value institutional products often stay on mainnet; consumer and high-frequency products usually belong on a rollup.
2. Budget for data costs as a minor line item. With blob targets at 14 per block, layer 2 data costs are small; spend the savings on audits.
3. Support smart accounts safely. Add EIP-7702 batching and gas sponsorship, but show users exactly which contract they are delegating to.
4. Treat liquid staking tokens as their own risk class. Use dedicated oracles and lower loan-to-value ratios for LSTs and restaking tokens.
5. Test against the next fork. Watch Glamsterdam's gas repricing and confirm your contracts behave the same before its mainnet date is set.
6. Know the cost to build. Pixel Web Solutions quotes DeFi protocol development from $6,000, a standard AMM DEX from $7,500, DeFi lending platforms from $5,000 to $25,000 and DeFi wallets from $5,000; audits and liquidity are separate budgets.

Frequently Asked Questions

Is Ethereum 2.0 already live?

Yes. The proof of stake part of Ethereum 2.0 went live at the Merge on 15 September 2022. The scaling work continued as Dencun (2024), Pectra (2025) and Fusaka (2025), and Glamsterdam is targeted for Q4 2026.

Is there an ETH2 token?

No. Ethereum has one native asset, ETH. Any website offering to swap ETH for "ETH2" is a scam. Some exchanges once showed staked ETH as "ETH2" internally, but that was a label, not a separate coin.

Did Ethereum 2.0 lower gas fees?

Not directly at the Merge. Fees fell later, mainly through Dencun's blobs for layer 2s and higher gas limits on mainnet. Research shows mainnet median fees fell from over $2 to under $0.02 between January 2024 and March 2026.

How does Ethereum staking affect DeFi?

Staking pays about 2% to 3% a year in ETH and creates liquid staking tokens that DeFi uses as collateral. It also sets a minimum return that other DeFi products must beat to attract ETH.

What is the difference between Pectra and Fusaka?

Pectra (May 2025) focused on accounts and staking: EIP-7702 smart accounts and a 2,048 ETH validator maximum. Fusaka (December 2025) focused on data: PeerDAS and blob-parameter forks that expanded rollup capacity, plus passkey signature support.

Is Ethereum still the best chain for DeFi?

It holds about 56% of all DeFi value as of October 2026, the deepest stablecoin liquidity and the most audited tooling. Other chains can be cheaper for specific products, so the best chain depends on your users and your assets.

Conclusion

The impact of Ethereum 2.0 on DeFi turned out to be bigger than its original pitch, just slower and under different names. Proof of stake made ETH a yield-bearing base asset, Dencun and Fusaka made layer 2 DeFi nearly free to use, and Pectra brought smart-account features to everyday wallets. For startups, that means 2026 is a practical time to build DeFi products that are easy to use, secure and open to everyone.

If you are planning a DeFi platform that takes advantage of today's Ethereum, Pixel Web Solutions can turn the idea into a launched product. As a leading DeFi development company, Pixel builds lending markets, DEXs, staking products and wallets on Ethereum and its layer 2s, with audited contracts and clear pricing. Talk to the team about how Ethereum 2.0's upgrades can work for your protocol.