Intent-Based Security: How NEAR Blocks Hacker Swaps

Key Takeaways:Intent-based security crypto systems let users state what they want (swap X for Y at minimum price Z), then let specialized solvers find the best route — removing the user from the dangerous mempool entirely.NEAR Protocol introduced its "Intents" transaction layer in October 2025, with single-use deposit addresses and atomic settlement enforced by smart contracts, so a swap either completes in full or not at all.Traditional DEX transactions are publicly visible in the mempool before they confirm, making them easy targets for front-running and sandwich attacks — intent-based architectures eliminate this exposure window.1inch Fusion+, CowSwap, and UniswapX all use variations of the intent model, indicating a broad industry shift toward solver-based cross-chain swap safety as the new standard.TeleSwap uses SPV light-client proofs — not custodians or multi-sig committees — to secure Bitcoin bridges, giving Bitcoin holders a trust-minimized path into cross-chain DeFi with over $496 million bridged to date, according to TeleSwap network stats.

Table of Contents

• The Invisible Danger Lurking in Every DEX Swap
• What Is Intent-Based Security in Crypto?
• How NEAR Intents Block Hackers: A 5-Step Walkthrough
• Why the Mempool Is a Hacker's Playground
• 4 Security Mechanisms That Make Intent Swaps Safer
• Intent-Based Platforms Compared: NEAR, 1inch, CowSwap, UniswapX
• What About Bitcoin? Cross-Chain Swap Safety Beyond NEAR
• Practical Takeaways for Everyday Crypto Users
• Frequently Asked Questions

The Invisible Danger Lurking in Every DEX Swap

Imagine you're at a busy market and you shout across the crowd: "I want to trade 1 ETH for $3,000 USDC — right now!" Before the seller can respond, a faster trader jumps in, buys all the USDC first, and sells it back to you at $3,100. You paid $100 more than you had to. You didn't make a mistake. You just announced your intention publicly.

That's exactly what happens millions of times a day on decentralized exchanges (DEXs). Your transaction sits in a public waiting room called the mempool — visible to everyone, including bots designed specifically to exploit it.

Intent-based security crypto is a system where users specify the outcome they want from a transaction — not the specific route — and specialized "solvers" find the optimal execution path while enforcing security guarantees via smart contract. This fundamentally rewires how cross-chain swaps happen by keeping your transaction details private until after they've already been matched and executed.

NEAR Protocol took this idea and ran with it in October 2025, launching an "Intents" layer powered by the Defuse Protocol. Let's break down exactly what that means — and why it matters for your funds.

What Is Intent-Based Security in Crypto?

Before intent-based systems existed, making a swap meant giving your wallet software very specific instructions: "Go to this exact liquidity pool, swap my ETH for USDC using this exact route, and pay up to X in fees." The transaction then gets broadcast to the network publicly and waits in the mempool to be included in a block.

An intent is different. Instead of specifying the route, you just describe the outcome you want: "I'd like to end up with at least $3,000 USDC in exchange for my 1 ETH, and I need this done within 5 minutes." The how is left to a set of professional participants called solvers (also called resolvers or fillers depending on the platform).

Think of it like hailing a taxi vs. using a ride-hailing app. Hailing a taxi means negotiating in real-time, on the street, in public. Using an app means stating your destination privately, letting the algorithm find the best driver, and arriving without the haggling. Intent-based security crypto is the ride-hailing app of DeFi.

The security benefit isn't just a side effect — it's architectural. When your transaction details aren't public until after they've already been matched and executed, the attack surface for hackers and bots collapses dramatically. This contrasts sharply with traditional on-chain swap methods where every detail is visible before settlement.

How NEAR Intents Block Hackers: A 5-Step Walkthrough

NEAR Protocol's implementation, which launched in October 2025 and is underpinned by the Defuse Protocol, follows a five-step flow that's worth understanding in plain language. NEAR's announcement at Blockchain News highlighted BTC-to-SOL swaps as a primary use case, but the model applies broadly.

Step 1: Token Discovery — No Commitment Required

The system first shows you what's available across multiple blockchains — no money moves yet, no addresses generated. You're just browsing. This exploration phase means there's nothing for an attacker to intercept because nothing has been broadcast.

Step 2: Quote Retrieval — Check the Price, Risk Nothing

You ask: "What would I get if I swapped 0.5 BTC for SOL right now?" The system returns a quote. Still no funds involved. You can walk away at zero cost. This differs fundamentally from traditional DEXs where even checking a price can sometimes emit a transaction that costs gas.

Step 3: Full Quote with a Single-Use Deposit Address

When you decide you want to proceed, the system generates a complete quote that includes three things: the exact exchange rate, a unique one-time deposit address, and a time-bound validity window. This deposit address is the first major security mechanism — more on that below.

Step 4: Swap Execution — Solvers Race to Fill Your Order

You send your funds to that unique deposit address and submit the transaction hash. Behind the scenes, solvers — professional market makers who have staked capital and reputation — compete to fill your order at the best available rate. The winning solver's execution is enforced by a smart contract: the price, the deadline, and the atomicity (all-or-nothing) are all locked in code.

Step 5: Status Tracking — Confirm and Move On

You can monitor the swap's progress using the deposit address as a reference key. When settlement confirms, your destination tokens arrive. The whole process is designed to resolve in minutes.

Why the Mempool Is a Hacker's Playground

To understand why intent-based security crypto matters, you need to understand the mempool — the waiting room where transactions sit before they're confirmed on-chain.

Every unconfirmed transaction on a traditional blockchain is publicly visible. Miners and validators choose which transactions to include in each block, and they can see everything that's waiting.

This creates two notorious attack types:

• Front-running: A bot sees your large buy order in the mempool, places its own buy order first (paying a higher fee to jump the queue), drives the price up, then sells to you at the inflated price. You lose money. The bot profits.
• Sandwich attacks: A more sophisticated version where the bot places one order before yours and one after, sandwiching your transaction and extracting value from the price movement your trade creates.

This class of attack is collectively called MEV — Maximal Extractable Value. MEV research compiled at MemSwap shows this isn't a fringe problem. It's a systemic feature of public mempools that has extracted billions of dollars from ordinary users since Ethereum launched.

Intent-based systems break this model at the root. Your transaction details don't enter the public mempool. The solver, not you, creates and submits the final on-chain transaction — and by then, the deal is already matched and locked.

4 Security Mechanisms That Make Intent Swaps Safer

1. Single-Use Deposit Addresses

Every quote in NEAR's intent system generates a fresh, unique deposit address. Once used, it's spent. This means an attacker who somehow captures the address can't reuse it for future transactions or replay attacks. The attack surface is permanently shrunk to a single, time-limited window.

2. Intent Atomicity — All or Nothing

A swap either completes in full or it doesn't happen. There's no partial execution. This matters because partial fills are a classic exploitation vector: a hacker can engineer a scenario where your swap half-executes, leaving you holding an awkward position at a worse price.

Eco's 2026 intent-based DEX guide explains that the settlement contract enforces price, deadline, and atomicity simultaneously — a triple guarantee baked into code.

3. MEV Protection via Solver Competition

Rather than your transaction being vulnerable in an open mempool, professional solvers compete privately to fill your intent. They're bounded by the settlement contract. They can't just ignore the terms you set — the contract enforces them.

1inch's Fusion+ documentation at The Block describes a similar architecture where "resolvers" — their term for solvers — execute trades in ways that front-running bots cannot exploit, precisely because the user never appears in the public mempool.

4. Cross-Chain Rail Guarantees

When an intent involves moving assets across blockchains (say, BTC on Bitcoin to SOL on Solana), the system routes through audited "rails" — messaging protocols like CCTP (Circle's Cross-Chain Transfer Protocol), Hyperlane, or LayerZero. Each rail has its own independently audited security model. The intent orchestration layer selects the most secure, most efficient rail per trade automatically. You don't have to know or care which bridge is being used — the system optimizes for you.

Intent-Based Platforms Compared: NEAR, 1inch, CowSwap, UniswapX

NEAR isn't the only player in the intent-based swap space. Here's how the major platforms stack up on the dimensions that matter most for security and usability:

Each platform uses slightly different terminology and architecture, but the core security insight is shared: remove the user from the public mempool, enforce outcomes via smart contract, and let professionals compete for execution quality.

What About Bitcoin? Cross-Chain Swap Safety Beyond NEAR

NEAR's intent model handles cross-chain swap safety elegantly within its ecosystem. But Bitcoin presents a unique challenge: Bitcoin itself doesn't have smart contracts in the Ethereum sense. Moving BTC into DeFi — whether on Ethereum, Solana, or any other chain — requires a bridge, and bridges have historically been among crypto's most exploited infrastructure.

Most wrapped Bitcoin solutions rely on custodians (a company holds your BTC) or multi-sig committees (a group of signers must approve each transaction). Both models introduce trust assumptions that sit outside Bitcoin's own security guarantees. If the custodian is hacked or the committee is compromised, your "Bitcoin" on another chain isn't actually backed.

TeleSwap takes a different approach. Rather than custodians or committees, TeleSwap uses SPV light-client proofs — a cryptographic method that verifies Bitcoin transactions using Bitcoin's own rules, without trusting any third party. TeleBTC, TeleSwap's wrapped Bitcoin token, is backed 1:1 by real BTC and can only be minted when a verified Bitcoin transaction proves the deposit actually happened. Custody is collateral-backed and slashable, meaning bad actors lose their stake if they misbehave.

This design places TeleSwap's security model closer to Bitcoin's own trust-minimized architecture than custodial alternatives like WBTC (which relies on BitGo as custodian) or solutions dependent on multi-sig committees. The result: users can bridge BTC to EVM chains and swap into ERC-20 tokens — all without trusting a central party with their Bitcoin.

The protocol has processed over $496 million in total bridged volume across 525,693 transactions, according to TeleSwap network stats. Those numbers reflect real usage of a trustless bridge at scale.

Practical Takeaways for Everyday Crypto Users

Understanding intent-based security is genuinely useful — it changes how you evaluate the platforms you use. Here are four concrete things you can act on right now:

1. Check whether your DEX uses intent-based routing. When evaluating any swap platform, look for mentions of "solvers," "fillers," "resolvers," or "intent-based execution." These signal MEV protection is built in. Platforms that route directly through AMM pools without a solver layer expose your transaction to the mempool.
2. Treat one-time deposit addresses as a security feature, not an inconvenience. If a platform gives you a unique address per quote, that's a design choice that limits your exposure. Reusing addresses — or sending to a generic contract address — increases attack surface.
3. For Bitcoin specifically, understand the trust model of your bridge. Before you wrap BTC or use any cross-chain swap involving Bitcoin, ask: who holds the underlying BTC? Custodian, multi-sig, or cryptographic proof? The answer determines how much you're actually relying on Bitcoin's security vs. someone else's promises. Consider comparing options like TeleSwap vs. other cross-chain solutions.
4. Slippage tolerance is not a substitute for intent-based protection. Many users set aggressive slippage tolerances thinking it prevents bad fills. It doesn't prevent sandwich attacks — it just limits one dimension of loss. MEV bots work within whatever slippage you allow. Intent-based systems remove you from the game entirely.

Frequently Asked Questions

What is intent-based security in crypto?

Intent-based security in crypto is a system where users specify the outcome they want from a transaction — not the specific steps to get there — and specialized "solvers" find the optimal execution path while enforcing security guarantees via smart contract. This approach removes the user's transaction from the public mempool, eliminating front-running and sandwich attacks. Instead of submitting "swap via this exact pool," you submit "I want at least X tokens for Y input," and the system handles the rest securely.

How does NEAR Protocol's Intents system block hackers?

NEAR Intents blocks hackers through three core mechanisms: single-use deposit addresses (so captured addresses can't be reused), atomic settlement (swaps complete fully or not at all), and private solver execution (your transaction never enters the public mempool). Launched in October 2025 and underpinned by the Defuse Protocol, NEAR's intent layer means that by the time an on-chain transaction is submitted, it's already matched and enforced — there's no public window for bots to exploit.

What is the mempool, and why is it dangerous?

The mempool (short for "memory pool") is a public waiting room where unconfirmed blockchain transactions sit before miners or validators include them in a block — and because it's public, anyone can see pending transactions and exploit them. Attackers use this visibility to front-run large trades (buying before you to inflate the price) or execute sandwich attacks (placing orders before and after yours to extract value from the price movement your trade creates). This class of exploit is called MEV — Maximal Extractable Value.

What's the difference between NEAR Intents and CowSwap or 1inch Fusion+?

All three are intent-based systems that protect users from MEV, but they differ in scope and architecture: NEAR Intents focuses on cross-chain swaps (including BTC-to-SOL) with an AI-native integration layer; 1inch Fusion+ uses professional "resolvers" who stake capital to fill orders; and CowSwap uses batch auctions to match opposing orders, returning surplus to users. NEAR is unique in its AI agent integration via Model Context Protocol (MCP), making it accessible to automated agents, not just human users.

What is a "solver" in intent-based DeFi?

A solver is a professional market participant — often a trading firm or algorithm — that competes with other solvers to fill a user's swap intent at the best available price. Solvers are bound by an immutable settlement smart contract that enforces the user's minimum price, deadline, and atomicity requirements. Think of them as competitive couriers: multiple bidders race to complete your delivery, but you only pay the best price they offer, and a contract guarantees the terms.

Is wrapped Bitcoin (like WBTC) safe to use in cross-chain swaps?

Wrapped Bitcoin solutions vary significantly in their security model: custodial solutions like WBTC rely on a centralized company (BitGo) holding the underlying BTC, while trust-minimized alternatives use cryptographic proofs to eliminate single points of failure. Custodial bridges introduce counterparty risk — if the custodian is hacked, your "Bitcoin" may not be redeemable. TeleSwap's TeleBTC uses SPV light-client proofs to verify Bitcoin transactions without trusting any custodian, making it a trust-minimized alternative for cross-chain swap safety.

How do I know if a DEX is protecting me from front-running?

Look for explicit mentions of "intent-based execution," "solver competition," "private order flow," or "MEV protection" in the platform's documentation — these signal that your transaction won't sit exposed in a public mempool. Platforms that route directly through automated market maker (AMM) pools without a solver layer are inherently more vulnerable. You can also check whether the platform uses a "private mempool" or "flashbots"-style relay, which offers partial but not complete MEV protection compared to full intent-based architectures.

The Shift Is Already Happening

Intent-based security crypto isn't a future concept — it's an active architectural shift reshaping how DeFi works right now. NEAR Protocol's Intents layer, 1inch Fusion+, CowSwap, and UniswapX have all converged on the same core insight: the safest swap is one where the user never appears in a public mempool at all.

The analogy is straightforward. In traditional DeFi, you're shouting your trade in a crowded room. In intent-based DeFi, you're handing a sealed envelope to a trusted courier service that competes to serve you best — with a contract guaranteeing they deliver exactly what you asked for.

For Bitcoin specifically, the cross-chain bridge layer matters as much as the swap layer. Trust-minimized bridges that use cryptographic proofs — not custodians or committees — extend Bitcoin's own security model into multi-chain DeFi rather than breaking it.

If you hold Bitcoin and want to explore what trustless cross-chain swaps actually look like in practice, start at teleswap.xyz. The protocol has bridged over $496 million across 525,693 transactions — not by trusting a custodian, but by trusting math.