Crypto Swap Routing Explained: Why Trades Aren’t Always Direct

You hit swap: Token A → Token B.

It looks like one clean trade.

But that simplicity only applies to centralized exchanges. On a CEX, your trade is typically matched inside one venue (an internal order book or internal liquidity), so there’s usually no “route” decision happening across multiple external pools.

On a decentralized exchange (DEX), it’s different.

Liquidity is spread across pools, protocols, and sometimes chains. So before your swap executes, the system has to decide something you don’t see:

Where should this trade actually go?

That decision is called order routing, and it can determine the true cost of a swap.

What Order Routing Means and Why It Exists

Order routing is the process of choosing the best path for a swap across available liquidity.

You want to swap Token A for Token B. There are multiple ways to do that: a direct pool, a route through an intermediate token, splitting across pools, or combining multiple venues.

Each option comes with trade-offs. Liquidity depth, fees, execution risk, and price impact all vary depending on the path.

Routing exists for one simple reason: liquidity is fragmented. If everything lived in one deep pool, you wouldn’t need a router.

How Order Routing Actually Works

Once you hit swap, the system doesn’t just execute immediately.

It typically:

1. Pulls data: pool quotes, liquidity depth, fee tiers, gas costs, and current market conditions.
2. Generates candidate routes: direct routes, multi-hop routes, and split routes.
3. Scores each route based on the net outcome: what you should receive after fees, slippage, and expected execution risk.
4. Executes the chosen route.

That’s the whole process, quietly happening in the background while you’re looking at a confirmation screen.

What Is a Swap Router

A swap router is the system that determines how your trade moves through liquidity to get from Token A to Token B.

It doesn’t just pick a pool. It constructs a path.

For example, in Uniswap v3, trades are executed through a defined “path” of pools, which can include multiple hops if there isn’t enough liquidity in a direct pair. Instead of forcing a single route, the router evaluates different combinations of pools and selects the one expected to return the best result.

In newer designs like v4, routing becomes more flexible, allowing more complex execution across different liquidity sources and instructions within a single transaction.

That means your swap might go directly from USDC → ETH, or it might take a route like USDC → WETH → UNI, or even split across multiple pools at the same time.

The goal is not just to complete the swap. It is to maximize what you receive after fees, slippage, gas, and execution risk.

DEXs, Aggregators, and Smart Order Routing

A DEX executes trades within its own liquidity pools.

An aggregator searches across multiple venues and liquidity sources to find the best route.

Order routing sits underneath both.

Even inside a single DEX, routing can involve multiple pools and token paths. Once multiple DEXs are involved, the complexity increases, and aggregators step in to handle that search.

This is essentially smart order routing from traditional markets.

Same idea. Liquidity is scattered, fees differ, and execution conditions change. So the system routes your order across available venues to optimize the result.

What Makes One Route Better Than Another

A route isn’t better because it looks cheapest before you hit send. What matters is what you actually receive after execution.

Price impact is a big factor. If a pool doesn’t have enough depth, your trade pushes the price against you. That can cost more than slightly higher fees in a deeper pool.

Slippage also matters. The quoted price and the executed price can diverge if liquidity shifts while your transaction is pending.

Then there are fees. Not just one, but several:

• LP fees
• Protocol fees
• Gas costs
• Bridge fees if applicable

A good-looking quote can change quickly once all fees are included.

Execution speed plays a role too. Slower routes expose you to price changes before finality. Cross-chain routes add more uncertainty because your trade depends on multiple steps completing across different chains, not all at once.

And reliability matters. Routes fail. Liquidity can disappear, gas can spike, or a pool can become unusable mid-execution.

Good routing systems optimize across all of these. Bad ones optimize for the best-looking quote and then fail in real conditions.

Routing Risks You Should Be Aware Of

Order routing depends on infrastructure you don’t control, and like any system that chooses paths, it can be manipulated or disrupted.

A routing attack targets the system’s ability to choose or execute routes, potentially leading to worse pricing, delays, or failed swaps.

For you, that shows up as:

• Unexpected execution results
• Delayed transactions
• Failed swaps

This is why good systems include protections like slippage limits, clear quote breakdowns, and reliable routing infrastructure.

How KAST Handles Order Routing

KAST uses order routing, but you don’t interact with it directly.

The product is designed for usability, not for manually managing liquidity paths.

KAST Convert allows users to deposit supported crypto and have it automatically converted into stablecoins after confirmation.

To execute swaps or conversions efficiently, KAST pulls pricing from aggregators and liquidity sources. The conversion costs are between 2 and 5%, depending on the asset.

That requires routing: the system decides which venues to use and which path to take to reach the desired outcome.

From your side, you confirm the swap.

You don’t pick pools. You don’t manage routes. You don’t compare venues.

The system handles it.

What You Should Take Away

Order routing is how decentralized swaps get executed.

If liquidity is spread across multiple places, a path has to be chosen. Sometimes that path is direct. Sometimes it involves multiple steps. Sometimes it splits your trade across different pools.

You don’t see it.

But it’s happening every time you hit swap.

👉 Get KAST!