How to Build an Intent-Based DEX Aggregator With Solver and Filler Networks

Cross-chain intent systems are increasingly built around this separation between user intent, liquidity provision, and settlement/verification.

It also avoids another major problem with conventional bridging: multiple representations of the same asset can become fragmented. Different bridged versions of USDC, for example, may not actually be interchangeable at a 1:1 value because they represent different bridge liabilities.

Design the Aggregator Around Single-Transaction UX

The goal should be to make complex DeFi operations appear as a single user action.

A mature flow looks like:

Connect wallet → Define intent → Sign → Receive assets

The user should not need to understand:

• Which DEX was used
• Which bridge was selected
• Which solver won
• Where liquidity originated
• Which gas strategy was used

That complexity belongs in the execution layer.

This follows the broader industry movement toward declarative, single-transaction experiences in which users authorize outcomes rather than manually orchestrating multiple blockchain transactions.

Build Solver Economics Carefully

Solver competition sounds decentralized, but incentive design determines whether the network actually remains competitive.