SettleX

SettleX is a cross-chain settlement infrastructure for OTC, premarket, and broker-style crypto deals. It enables users to create, discover, and settle private market transactions—such as token premarket offers, decentralized OTC trades, and broker-mediated deals—through secure, non-custodial smart contracts deployed on a single execution chain.

SettleX abstracts away liquidity and chain fragmentation by integrating LI.FI as a cross-chain routing layer, allowing users to participate in deals using assets held on different chains or in different tokens. Users can seamlessly swap or bridge funds via LI.FI and complete deal execution without manually handling cross-chain complexity. ENS is integrated to provide human-readable identities, improving counterparty clarity and trust in private transactions.

The platform supports multiple deal flows, including seller- and buyer-initiated premarket offers with collateralized settlement, full or partial OTC orders, and broker-assisted trades with programmable brokerage fees. All funds are locked and settled on-chain, with enforced settlement windows and fallback logic to protect participants in case of non-delivery. SettleX is designed as modular financial infrastructure that brings real-world private market mechanics on-chain with a smooth, cross-chain user experience.

SettleX is built as a modular, execution-chain–based DeFi system with cross-chain orchestration handled at the frontend layer. Core settlement logic for OTC, premarket, and broker deals is implemented in Solidity smart contracts and deployed on Polygon, where all funds are escrowed and settled non-custodially. The contracts support full and partial fills, collateralized premarket settlement, broker fee routing, and admin-configurable platform fees.

The frontend is built with React and web3 libraries, and integrates the LI.FI SDK to handle cross-chain swaps and bridges. LI.FI allows users to enter deals from Ethereum, Base, or Polygon using any supported asset, abstracting away manual bridging and token conversions.

ENS is integrated to resolve human-readable names for wallet addresses, improving usability and trust in private market interactions. This separation of concerns—cross-chain liquidity via LI.FI, identity via ENS, and settlement via smart contracts—results in a clean, scalable architecture. A notable hacky aspect is treating multiple chains as a single liquidity surface while keeping all settlement logic simple and deterministic on one execution chain.