Lexicon

Our RWA Data Marketplace demonstrates three tiers of oracle integration:
Tier 1 — Standard Assets (Crypto, FX, Commodities):
We integrate directly with existing Chainlink Price Feeds (BTC/USD, ETH/USD, XAU/USD) to provide proven, battle-tested data for tokenized assets backed by these collateral types.
Tier 2 — Custom RWA Assets (Property, Private Credit, Invoices):
For assets where public Chainlink feeds don't exist yet, we've built a CRE-powered custom oracle that aggregates data from multiple sources, validates it via AI, and publishes it on-chain — exactly the same architecture that Superstate, Ondo, and Securitize use for their NAV feeds.
Tier 3 — x402 Micropayment Layer:
Unlike traditional data feeds (which are free but require Chainlink partnership to create), our marketplace uses x402 to make custom data feeds economically sustainable and permissionless — any protocol can pay $0.05 to query specialized RWA data without needing a Chainlink partnership.

Lexicon project is a Chainlink CRE (Chainlink Runtime Environment)-powered RWA (Real World Asset) data marketplace with five integrated components:

1. Chainlink CRE Workflow - The "brain" that fetches data from multiple sources, runs BFT consensus, and flags anomalies
2. AI Integration- I integrate openai GPT-5 model to check for anomalies
3. x402 Payment Gateway - Express.js API that gates RWA data behind USDC micropayments
4. Mock RWA APIs - Simulates Property valuation, Fund NAV, and Invoice verification providers
5. Smart Contract Registry - Solidity-based RWADataRegistry on Base Sepolia
6. Frontend Dashboard - Next.js for visualizing marketplace stats