# 0x protocol

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### tl; dr

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* DEX aggregator integrating both on- and off-chain liquidity:
  - on-chain liquidity is sourced by sampling smart contract liquidity pools, such as uniswap and curve. 
  - off-chain liquidity is sourced from professional market makers via the [0x Request-for-Quote (“RFQ”) system](RFQ.md)


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### resources

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* [matcha.xyz](https://matcha.xyz/)
* [RFQ orders official guide](https://protocol.0x.org/en/latest/basics/orders.html#rfq-orders)
* [0x at mev.wtf](https://docs.google.com/presentation/d/1kde_3RPgHJP0vOP8GG92mlA7VtdGdHiGdrEGhFhx-5U/edit#slide=id.g465c39fec5_0_1309)