How Brick-Chain Finds the Best Swap Route (and Why It Matters)

A token swap looks simple on the surface: choose a token to sell, a token to buy, press
“Swap.” Behind that single click, a lot has to go right. Price, fees, routing, and timing all
determine how many tokens you actually receive. This post explains how Brick-Chain
searches across liquidity to find a strong route—so you get competitive execution without
babysitting the details.

Why Routing Matters

On-chain liquidity is fragmented by design. Different DEXs and liquidity networks host
different pools, with different depths and fees. If you always swap in a single pool, you may
overpay via price impact or miss a better path that splits the trade across multiple venues.
Good routing solves this by searching many sources at once and assembling a path that
balances rate, fees, and reliability.

If you want a quick refresher on the basics of swaps, read our primer:
What Is a Token Swap?

How Our Routing Works

Brick-Chain sits on modern infrastructure and connects to decentralized liquidity on Base.
When you request a quote, our router evaluates multiple potential paths at once. At a high
level, it follows four steps:

• Discover liquidity. We query reputable DEXs and liquidity networks to see where depth is best for the pair and size you entered.
• Simulate candidate routes. The router simulates each route on-chain (locally) with your exact amount, accounting for pool fees and price impact.
• Include gas. Quotes factor in estimated gas for the route chosen. A “better” price that costs more gas isn’t really better.
• Return the best feasible path. We select the path that maximizes your expected output net of fees, gas, and slippage tolerances.

Sometimes the best path is a single hop (USDC → WETH). Other times, splitting a trade
across two venues, or routing through an intermediate token, yields a better result. The
router decides that for you in milliseconds.

What “Best Price” Really Means

“Best price” isn’t only the pool’s mid-price. We optimize for effective execution:

• Pool fees. Different pools charge different fees (e.g., 0.05% vs 0.3%). The router weighs fee tiers against depth.
• Price impact. Bigger trades can move the price in shallow pools. The router prefers deeper venues when that saves you more than a lower fee would.
• Gas cost. Two hops can be cheaper than one if gas is low; the opposite can also be true. The router includes gas estimates in the comparison.
• Reliability. Routes that are likely to fail (stale, illiquid, or complex) are penalized vs. equally priced, simpler alternatives.

If you want a neutral explanation of aggregators and routing, check out:
Ethereum.org docs

Slippage & Failure Protection

Markets move. Between the time you request a quote and the time your transaction is mined,
prices can change. To protect you:

• Slippage tolerance. You confirm a maximum slippage (e.g., 0.5%). If the market moves beyond that, the trade will fail rather than execute at a worse rate.
• Allowance & approvals. For ERC-20s, you approve spending once. We minimize unnecessary approvals and keep the flow clear so you see what you’re signing.
• Resilient paths. The router prefers paths that are less likely to change drastically during confirmation, improving your success rate.

MEV Awareness (Without the Jargon)

Miner/Maximal Extractable Value (MEV) is the set of techniques block builders can use to
reorder, include, or exclude transactions. The practical risk for regular users is getting
sandwiched—someone sees your trade, trades ahead of you, and your execution worsens.

We reduce this risk by favoring routes and fee settings that make your transaction harder to
exploit and by avoiding unnecessary public mempool exposure when it doesn’t help the user.
The outcome for you: more “what you saw” is “what you get.”

When a Quote Changes

Occasionally, the quote you saw expires before confirmation—usually because the market
moved or a pool was rebalanced. When that happens, we show a fresh quote. If the update
isn’t favorable, you can cancel and retry with a different size or a slightly higher slippage
tolerance. We’d rather give you a clear re-quote than hide the change behind the scenes.

Why It Matters for You

• Better net outcomes. Smart routing helps you receive more of the token you want after fees and gas.
• Less guesswork. You don’t need to compare pools manually or understand every fee tier.
• Fewer failed transactions. Our route selection aims for both price and reliability, not just a theoretical best-case.
• Clarity. We show the path and the expected output before you confirm, so you can make an informed decision.

As we wrote in The Evolution of DeFi,
the story of this cycle is turning powerful primitives into dependable products. Routing is a
big part of making swaps feel “normal”—quick, predictable, and cost-aware.

Get Started

If you’re new to Brick-Chain, start small and see how routing plays out with real numbers.
Try swapping between USDC and WETH, then compare the displayed route and output with a
single-pool alternative. The difference is the value of smart execution.

Editorial note: This article is for educational purposes and does not constitute financial advice.
Always do your own research and use amounts you can afford to risk.