Prices are offered by CoinPaprika.com and Coingecko. Latest Crypto prices (Bitcoin, Ethereum, etc.) are averaged over several exchanges. CoinPaprika provides a comprehensive insight here into the difference between prices of assets, status of exchanges, and liquidity of markets (calculated for orders within 10% span of the spot price). Market depth, liquidity, and exchange status can affect the price average. Check your Exchange bid/ask price before making any buy/sell decision.