# Oracles

> Systems that publish external data for use by on-chain applications.

- Canonical page: [Oracles](https://www.qrlecosystem.com/capabilities/oracle/)

## Projects
- [PQlyMarket](https://www.qrlecosystem.com/projects/pqlymarket/index.html.md): An open-source prediction-market dApp for the QRL 2.0 testnet with market creation, YES/NO conditional-token trading, constant-product automated market makers, liquidity provision, oracle resolution, and a testnet faucet.