CoinMarketCap Replied to My Question About Their ETHM Quotes

Hello there,

Thanks for reaching out.

We would like to clarify that our price and volume are derived from APIs, rather than assigned by us.

• Every minute, the various exchanges are queried for their most recent market data.
• All data is run through several data cleaning and verification algorithms to ensure data integrity.
• The price for each individual market pair is calculated by taking the unconverted price reported directly from the exchange and converting it to USD using CoinMarketCap’s existing reference prices.

The price of any cryptocurrency is a volume-weighted average of market pair prices for the cryptocurrency. The number of markets, methodology, outlier detection, and calculation may differ from other sites.

I will forward your feedback to our team for further checking. 

Sincerely,
CoinMarketCap

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So that doesn't explain why Uniswap never agrees with their price. There's clearly something wrong somewhere and I don't see how the developer can be creating the discrepancy between CMC and the exchanges. Any thoughts?