All posts
How DeFi works now: 2026 tech stack explained
Gas-free transactions, restaking, and smart accounts have quietly rewritten how DeFi behaves. Here's what actually shifted between defi 2025 and 2026 — and which changes you'll feel using protocols today.
Insights
Numbers
Proven performance
TL;DR
Key takeaways
DeFi now runs as five layers: settlement, execution, bridging, smart-account UX, and AI automation
Paymasters cover gas for you, so holding native tokens on every chain is no longer required
Blob transactions (EIP-4844) cut L2 fees by 80–95%, making micro-payments and frequent trades viable
For USDC, prefer Circle's burn-and-mint CCTP over wrapped bridges to avoid extra counterparty risk
Bridge hacks drained $2.5B+ from 2021–2024, so check audits and liquidity before fees on big transfers
17 minute reading
Insights
Why DeFi's architecture had to change
So, what is DeFi in practical terms? It's on-chain finance where smart contracts replace intermediaries and users control funds via a DeFi wallet.
In 2025, DeFi is not a single chain or application category; it is a layered technical stack spanning settlement, execution, interoperability, and user experience layers simultaneously.
The 2025 technical stack has five identifiable layers:
Settlement layer: Ethereum, Solana, Bitcoin, and Cosmos chains hold canonical asset state and provide cryptographic finality guarantees
Execution layer: ZK rollups (zkSync Era, Scroll, Linea) and optimistic rollups (Arbitrum, Base, OP Mainnet) process transactions at low cost while inheriting L1 security
Coordination layer: Cross-chain messaging protocols (LayerZero, Wormhole, Chainlink CCIP, Hyperlane) relay asset and data proofs across chains, enabling cross-chain swaps and omnichain token standards
UX layer: Account abstraction wallets with paymaster gas sponsorship, session keys, and intent solvers that translate user goals into optimized on-chain transactions
Automation layer: On-chain AI execution agents that monitor positions and execute strategies without manual approval per transaction
Total value locked across all chains exceeded $150 billion in 2025 (source: DeFiLlama), driven by restaking growth, stablecoin expansion past $300 billion in circulating supply (source: DeFiLlama Stablecoins), and institutional DeFi adoption from firms previously operating exclusively in traditional finance.
The phrase "DeFi roadmap 2025" now refers to a converging set of technical standards — ERC-4337, EIP-7702 (which lets EOAs temporarily behave like smart accounts), cross-chain messaging, and ZK proof verification — not individual protocol feature releases.
Why DeFi's architecture needed to change
DeFi's architecture needed to change because multi-chain growth made liquidity, UX, and security costs scale faster than user value.
The five structural pressures that forced architectural change:
1. Liquidity fragmentation: Deploying the same protocol across 20+ chains split TVL into isolated pools, worsened slippage on large trades, and made cross-chain arbitrage inefficient.
2. DeFi wallet complexity: Requiring users to hold native gas tokens on each chain created a hard onboarding wall. Definition (Paymaster): A paymaster is an ERC-4337 contract that sponsors gas fees for a user's smart account, removing the "need ETH for gas" requirement for most user flows.
3. Settlement cost: Pre-EIP-4844, L2 data posting costs made micro-transactions economically unviable. Blob transactions dropped L2 fees by 80–95% (source: L2Beat), unlocking DeFi-native payments and high-frequency strategy execution.
4. Regulatory pressure: Separating execution, settlement, and custody layers gave protocols compliance flexibility without abandoning non-custodial guarantees.
5. AI integration readiness: AI liquidity management became viable only after on-chain execution costs dropped and structured oracle data feeds became reliable enough to support automated decision-making at scale.
The combined result: protocols that couldn't abstract complexity away from users lost TVL to those that could.
How DeFi's core technical stack works in 2025
DeFi's 2025 stack is a five-layer architecture where each layer handles a specific function and can be upgraded independently:
1Layer 1 — Settlement: Ethereum, Solana, Bitcoin, and Cosmos chains hold canonical asset state. No DeFi operation is economically final until it settles here.
Layer 2 — Execution: ZK rollups and optimistic rollups process transactions at low cost with Ethereum security inheritance.
Layer 3 — Interoperability: Cross-chain messaging protocols including LayerZero, Wormhole, Chainlink CCIP, and Hyperlane relay asset and data proofs between chains.
Layer 4 — Account/Intent: ERC-4337 smart accounts with session keys and paymasters allow users to express goals — "swap 1,000 USDC for ETH at the best rate across all L2s" — and solver networks compete to fulfill those intents optimally.
Layer 5 — Automation: On-chain AI execution agents monitor positions, execute rebalancing, and manage risk without requiring manual approval for each transaction.
Crypto staking platforms sit across layers 1 and 3 — staking occurs at the settlement layer, while liquid staking tokens (LSTs) and liquid restaking tokens (LRTs) circulate across chains via Layer 3 messaging. Lido issues stETH on Ethereum mainnet, and that token is actively used across Arbitrum, Base, and other L2s through bridging mechanisms.
Therefore, DeFi in 2025 works by settling security on L1, executing cheaply on L2, moving value via interoperability layers, and abstracting user actions through smart accounts and automation.
Omnichain stablecoins: best cross-chain USDC and USDT bridges
Choosing a bridge chain route (source chain → destination chain) matters most for stablecoins because liquidity and finality differ by network. Native USDC cross-chain transfers via Circle's Cross-Chain Transfer Protocol (CCTP) became the institutional standard in 2025, reducing counterparty risk relative to wrapped USDC bridge models by burning on source and minting on destination with cryptographic proof verification.
Three practical options for stablecoin bridging:
CCTP (burn/mint) for institutional USDC transfers — lowest custodial risk, no wrapped token exposure
Across/Stargate (liquidity network) for fast L2↔L2 stable moves — optimized for speed and low slippage
Aggregators (Bungee/Rubic) for route optimization across multiple protocols simultaneously
For non-stable routes, a cross chain swap aggregator can combine DEX routing plus bridging into one quote.
Over $2.5 billion was lost to bridge exploits between 2021 and 2024 (source: Immunefi), making security criteria more important than fee optimization for large transfers. Key risk factors for stablecoin bridge selection: smart contract audit history, insurance coverage, oracle manipulation resistance, and liquidity depth.
A detailed comparison of best cross chain bridge options for USDC/USDT — including fees and security models — is covered in our dedicated guide.
Best MCP servers for DeFi: AI agents and on-chain execution
Definition (MCP): Model Context Protocol is an open standard that connects AI models (GPT-4o, Claude, Gemini) to external tools and APIs. In DeFi, MCP tool servers act as middleware — translating natural language goals into structured on-chain transactions with gas estimation, slippage tolerance, and route optimization built in.
Active production use cases include flash loan arbitrage AI (agents identify multi-hop opportunities and execute complete loan-trade-repay cycles within a single block) and AI risk management DeFi (monitoring collateral ratios on lending protocols and triggering protective actions before liquidation thresholds are breached). Portfolio rebalancing across chains and oracle verification against multiple price feeds are also common.
Session key scoping limits agents to specific tokens, maximum amounts, and time windows. MCP-enabled agents with broad wallet permissions introduce novel attack vectors: malicious tool servers injecting false price data, prompt injection attacks redirecting agent execution, and automated strategies that can destabilize thin liquidity markets. Transaction simulation before execution is an essential safeguard.
Protocol-level comparisons of MCP definition and best MCP servers for DeFi are detailed in our dedicated guide.
Lead Growth Product Manager
FAQs
Got questions?
Still have questions? Contact us and we’ll help you out.
01
What are the DeFi trends for 2026?
DeFi in 2026 is defined by a converging set of technical standards rather than individual protocol releases — ERC-4337 smart accounts, EIP-7702 (which lets regular wallets temporarily behave like smart accounts), cross-chain messaging, and ZK proof verification. The industry is also shifting from raw TVL growth toward productive, capital-efficient liquidity concentrated in fewer, deeper venues. On-chain AI execution agents and intent-based swaps round out the picture.
02
What is the DeFi stack and what are its layers?
The 2025–2026 DeFi stack has five identifiable layers: a settlement layer (Ethereum, Solana, Bitcoin, Cosmos) that holds canonical asset state, an execution layer (ZK and optimistic rollups), an interoperability layer (cross-chain messaging like LayerZero and CCIP), an account/intent layer (ERC-4337 smart accounts), and an automation layer (on-chain AI agents). Each layer handles a specific function and can be upgraded independently.
03
What technology does DeFi use?
DeFi runs on permissionless blockchains where smart contracts replace intermediaries, and users control funds through non-custodial wallets that sign transactions directly. The financial logic lives in smart contracts on-chain, while rollups handle cheap execution and cross-chain messaging protocols move value between networks. No bank account, approval, or counterparty trust is required in typical non-custodial flows.
04
How is DeFi different from traditional finance?
DeFi is a permissionless system where you control assets via non-custodial wallets instead of banks or brokers — no account approval, no withdrawal limits, and no counterparty trust in standard flows. It removes many middlemen, which lowers discretionary fees and enables 24/7 settlement. The tradeoff is that you still pay blockchain network fees, which can rise during congestion.
05
How do ZK rollups and optimistic rollups work in DeFi?
ZK rollups (zkSync Era, Scroll, Linea) and optimistic rollups (Arbitrum, Base, OP Mainnet) process transactions off-chain at low cost while inheriting the security of their underlying L1. After EIP-4844 introduced blob transactions, L2 fees dropped 80–95% according to L2Beat, unlocking DeFi-native payments and high-frequency strategies. They periodically settle proofs back to Ethereum for finality.
06
What is account abstraction and how does it improve DeFi UX?
Account abstraction (ERC-4337) enables smart contract wallets with paymaster gas sponsorship, session keys, and intent solvers. A paymaster sponsors gas fees so users no longer need to hold native gas tokens on every chain, while intent solvers compete to fulfill goals like "swap 1,000 USDC for ETH at the best rate across all L2s." This abstracts away the complexity that previously created a hard onboarding wall.
07
What is the best way to bridge USDC and USDT across chains?
For native USDC, Circle's Cross-Chain Transfer Protocol (CCTP) became the institutional standard in 2025 by burning on the source chain and minting on the destination with cryptographic proof — avoiding wrapped-token risk. Liquidity networks like Across and Stargate are optimized for fast, low-slippage L2↔L2 stable moves, while aggregators like Bungee and Rubic optimize routes across protocols. With over $2.5 billion lost to bridge exploits between 2021 and 2024, security matters more than fees for large transfers.
08
What is total value locked (TVL) in DeFi and why does capital efficiency matter now?
Total value locked across all chains exceeded $150 billion in 2025, driven by restaking, stablecoin supply past $300 billion, and institutional adoption. In 2026 the focus is shifting from raw TVL toward productive TVL — concentrating capital in fewer, deeper venues rather than many shallow pools. One analysis estimated over $12 billion in DeFi liquidity sits idle, highlighting the push for better capital recycling.
Learn more
Bridge guide
Ethereum 2026 upgrades & DeFi: the full breakdown
From Glamsterdam to the data-publication tweaks that quietly slashed L2 fees — here's what actually moved Ethereum DeFi this year, and where TVL and staking yields are heading next.
Read article
Best cross-chain bridge: 7 top crypto bridges compared
Bridge fees, speed, and security don't always move together — pick wrong and you overpay or get stuck. We break down which cross chain bridge actually fits your DeFi moves in 2026.
Read article
Best crypto bridges: cheapest cross-chain swaps
Bridging fees can quietly eat 5% of your transfer if you pick wrong. We break down how the top cross-chain bridges stack up on real costs, settlement times, and chain coverage so your next DeFi move isn't a gamble.
Read article
Swap crypto across 50+ networks
Non-custodial. No KYC. Connect your wallet and get started.
