How to find a swap route when no direct trading pair exists

05 September 2026

You find a swap route by breaking the trade into a sequence of intermediate swaps, each using a trading pair that does exist. The route connects your starting asset to your target asset across one or more blockchains, using liquidity pools and an automated pathfinder.

Why routes exist even when pairs do not

A direct trading pair is a single market where two assets trade against each other. Many combinations lack this. For example, you might hold USDC on Ethereum but want a token that only trades against ETH on Polygon. No direct USDC-to-that-token pair exists across chains. A route solves this by chaining together available pairs: USDC → ETH (on Ethereum), then ETH → that token (on Polygon). The pathfinder finds this sequence automatically.

How the pathfinder works

The exchanger you use operates a routing engine. It scans liquidity pools across multiple blockchains. For each pool, it knows the two assets it holds and the chain it lives on. The engine builds a graph: nodes are assets, edges are pools. It then searches for a path from your source asset to your target asset, using algorithms similar to shortest-path calculations.

The search considers several constraints: - Liquidity depth. A path that passes through a thin pool may fail or incur high slippage. The engine prefers pools with enough volume. - Swap fees. Each intermediate swap costs a fee. The engine estimates the total cost of each candidate route and ranks them. - Bridge steps. If your route crosses a chain boundary, the engine must include a bridge step. It checks whether a bridge exists between the two chains and whether it has sufficient capacity.

The engine returns the route with the lowest estimated cost. You never see the intermediate steps unless you choose to inspect them. The interface shows only the final amount you receive.

Practical example

Suppose you want to swap a small altcoin on BNB Smart Chain for a different altcoin on Avalanche. No pool holds both. The engine might find: 1. Altcoin A → BNB (on BSC, using a BNB pool) 2. BNB → wrapped ETH (via a cross-chain bridge that accepts BNB) 3. Wrapped ETH → Altcoin B (on Avalanche, using an ETH pool)

Each step uses an existing pair. The route works even though no single pool connects the two altcoins.

Limitations and risks

Routes are not guaranteed. If any intermediate pool lacks liquidity, or if the bridge step fails, the entire swap reverts. You lose only the gas fees for the failed steps, not the principal.

Slippage accumulates across multiple swaps. A route with three hops may have higher total slippage than a direct swap would have, had one existed. The pathfinder estimates this, but actual slippage depends on real-time pool conditions.

Cross-chain routes introduce additional failure points. Bridges can be slow, congested, or temporarily halted. The exchanger will attempt to find an alternative route, but if none exists, the swap fails.

When to look for a route yourself

You do not need to find routes manually. The exchanger does it for you. But understanding the process helps you set realistic expectations. If you are swapping an obscure token with low liquidity, be prepared for the swap to fail or to require a high slippage tolerance.

You can also improve your odds by choosing a more liquid intermediate asset. Stablecoins and major tokens like ETH or BTC have deep pools on most chains. Specifying a route that passes through a stablecoin often yields better results than letting the engine pick an obscure intermediate.

Next steps

The hub page "Swapping crypto across chains" explains how the entire process fits together, from initiating a swap to receiving your final asset. That page covers what to do when the route involves a bridge, which is a separate mechanism from the simple multi-hop path described here.

Back to ethereum