What Is 1inch? DEX Aggregators Explained Simply
Learn what 1inch is and how DEX aggregators find the best swap rates across decentralized exchanges. A simple guide for beginners with practical examples.
What Is 1inch? DEX Aggregators Explained Simply
1inch is a decentralized exchange (DEX) aggregator that sources liquidity from multiple platforms to give users the best possible swap rates. Instead of making you check each DEX manually, it splits one trade across several exchanges to minimize slippage and fees. This article explains how 1inch works, why DEX aggregators matter, and walks through a practical example.
How 1inch Aggregates Liquidity Across DEXs
The core problem in decentralized finance is liquidity fragmentation. Tokens are scattered across dozens of DEXs like Uniswap, SushiSwap, and Curve — each with its own pools and prices. If you try to swap a token on a single DEX, you might get a poor rate because that exchange’s pool doesn’t have enough depth. 1inch solves this by acting as a smart router.
When you submit a swap on 1inch, its algorithm scans all connected DEXs in real time. It identifies which pools offer the best combined rate for your trade. The key innovation is that 1inch can split your order into multiple parts and execute them across different DEXs simultaneously. For example, it might send 40% of your trade to Uniswap, 35% to Curve, and 25% to Balancer, all within the same transaction.
This aggregation reduces price impact — the difference between the expected price and the actual price caused by a single DEX’s limited liquidity. By spreading the trade, 1inch ensures you get closer to the true market price.
| Feature | Single DEX Swap | 1inch Aggregated Swap |
|---|---|---|
| Liquidity sources | One pool | 10+ DEXs (Uniswap, SushiSwap, Curve, Kyber, etc.) |
| Slippage risk | Higher if pool is shallow | Lower due to order splitting |
| Gas efficiency | One simple swap | Optimized route may cost similar or less gas |
| Price discovery | Limited to one venue | Best across all venues |
Why DEX Aggregators Like 1inch Matter for Traders
Traders who swap tokens directly on a single DEX often overpay — without realizing it. The difference in rates between two DEXs for the same pair can be substantial, especially for less popular tokens. DEX aggregators eliminate this guesswork.
Here are the main benefits 1inch offers:
- Best execution: The pathfinder algorithm finds the most cost-effective route.
- Slippage protection: You set a maximum slippage tolerance; if the route would exceed it, the transaction is reverted.
- Gas optimization: 1inch uses a technique called chi gas token (CHI) to reduce gas costs on Ethereum — you can pay a small fee to use this service.
- Privacy: Unlike centralized exchanges, you don’t need to create an account or share personal data.
⚠️ Warning: Beginners sometimes assume that aggregators always give the best price, but you still need to set a reasonable slippage tolerance (e.g., 0.5%–1%). Setting it too low may cause your transaction to fail, wasting gas. Setting it too high opens you up to front-running attacks where someone manipulates the price before your trade settles.
The Pathfinder Algorithm: 1inch’s Secret Weapon
At the heart of 1inch is its proprietary Pathfinder algorithm. Pathfinder doesn’t just look at direct trades — it explores multi-hop routes. For instance, swapping Token A for Token D might be cheaper if you first trade A for B on one DEX, then B for C on another, and C for D on a third. Pathfinder evaluates thousands of possible combinations in seconds.
The algorithm considers:
- Direct swaps on each DEX
- Multi-step paths (e.g., A → B → C)
- Split orders (partial trades across venues)
- Gas costs for each route
It then returns the combination that gives you the highest net output after subtracting gas and fees. This calculation happens on-chain, so you don't have to trust a centralized server.
1inch in Action: A Practical Example
Imagine you have some DAI and want to swap it for LINK. You check Uniswap and see you’ll get 100 LINK. Then you check SushiSwap — they offer 102 LINK. But you want the best deal. Instead of manually comparing, you use 1inch.
- Open the 1inch app and select the DAI → LINK pair.
- Enter the amount of DAI you want to swap.
- 1inch’s Pathfinder scans all connected DEXs and returns the optimal route:
- It finds that a direct swap on Kyber gives 103 LINK, but a split between SushiSwap (60%) and Curve (40%) yields 105 LINK after accounting for gas.
- You review the route, set a slippage tolerance of 0.5%, and confirm the transaction in your wallet (like MetaMask).
- The transaction executes: part of your DAI goes to SushiSwap, part to Curve, and 105 LINK arrive in your wallet.
You just received 5% more LINK than the best single-DEX offer, and the process took about as long as a normal swap. This is the power of a DEX aggregator.
How 1inch Generates Revenue and Stays Free for Users
1inch doesn’t charge a separate platform fee for regular swaps. Instead, it earns revenue through 1inch Earn (a staking product) and partnerships with certain DEXs that pay for order flow. The protocol also has a native token, 1INCH, which is used for governance — holders vote on protocol upgrades and fee structures. This token is not a share of profits but a voting right.
Conclusion
1inch is more than just a DEX — it’s a smart layer that makes decentralized trading more efficient. By aggregating liquidity across numerous DEXs, using the Pathfinder algorithm, and splitting orders to minimize slippage, it ensures traders get the best possible rates. For anyone regularly swapping tokens in DeFi, understanding and using a DEX aggregator like 1inch is a simple way to save money without adding complexity.
