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

Your protocol should define:

• Solver eligibility
• Bonding requirements
• Bid format
• Solver fees
• Reward mechanisms
• Failed-fill penalties
• Reputation
• Capital requirements
• Auction frequency
• Tie-breaking rules

This is not merely an economic detail. Recent research into intent-based exchange markets found that changes to solver reward mechanisms can materially affect solver concentration, particularly for larger orders.

A DEX Aggregator Development Company building this infrastructure should therefore model solver economics before deploying the auction system.

Recommended Technology Stack

A production architecture could use:

1. Frontend: React / Next.js
2. Wallet: WalletConnect, embedded wallets, EIP-712
3. Backend: Node.js or Go
4. Orderbook: PostgreSQL + Redis
5. Solver engine: Rust / Go / Python depending on optimization requirements
6. Blockchain access: viem / ethers / chain-specific RPC infrastructure
7. Smart contracts: Solidity
8. Simulation: Tenderly or equivalent transaction simulation infrastructure
9. MEV protection: Private transaction infrastructure
10. Monitoring: Prometheus + Grafana
11. Analytics: ClickHouse or a comparable high-throughput analytics database

For high-volume systems, keep quote generation, auction coordination, solver computation, and settlement monitoring separate. A single backend service becomes a bottleneck as solver participation grows.

Security Checklist

Before launching an intent-based aggregator, test:

• Signature replay
• Malicious solver bids
• Fake liquidity quotes
• Stale quotes
• Partial fills
• Expired intents
• Nonce reuse
• Token approval exploits
• Reentrancy
• Settlement-contract failures
• Cross-chain message spoofing
• Oracle manipulation
• Filler collusion
• Auction censorship
• Solver centralization
• Gas-price manipulation

The biggest mistake is treating the solver as trusted infrastructure. Solvers should be economically motivated but technically constrained.