Frequently Asked Questions

  1. What is OpenMarketCap?
    OpenMarketCap is a token price tracker.
  2. Where does the data come from?
    Directly from API of exchanges.
  3. Why did the volume suddenly jump on July 3?
    We added new exchanges. The reported volume is the aggregate across exchanges.
  4. Why is this data different from CMC?
    There are three reasons why token prices may differ on OMC and CMC:
    • Listing fees - CMC currently excludes exchanges without fees. BitThumb is a major exchange that falls into this category. Prices reported by these exchanges are included on OMC.
    • All exchange data - The price of BCD (bitcoin diamond) on CoinMarketCap is an interesting case study. The highest volume exchange to trade BCD is Binance. However, the Binance price is excluded from the average price because it is an outlier. With OMC, we want to avoid one off rules. Until we can apply a consistent set of rules, we will include all exchanges in the pricing calculations.
    • Smaller marketcap tokens - The variability in pricing is highest for thinly traded tokens. NetCoin is one example: Price of NetCoin on CMC vs Price of NetCoin on OMC. The 600x difference between prices is entirely due to which exchanges are included in the price calculation.
  5. What are your rules for determining the ranking?
    • Tokens are ranked by marketcap, which is the circulating supply * price (marketcap)
    • Tokens without any trading volume in the past 24 hours are excluded from the ranking.
  6. What are your rules for calculating token prices?
    • The average price for each token is the volume-weighted average across exchanges
    • To get the price per exchange in USD, we first find the token's price in BTC. We then determine the fiat (USD, EUR, JPY, KRW, USDT) price for BTC on that exchange.
      ZRX / ETH * ETH / BTC = ZRX / BTC
      ZRX / BTC * BTC / USD = ZRX / USD
  7. Why does a trading pair have no volume?
    Token pairs can be listed on a exchange without any recent volume. Exchange API's report the latest price traded. The latest price can be days or even weeks old. OMC does not include any exchange data that is older than 24 hours.
  8. What is an outlier?
    Outliers are data points (price, volume etc) that lie outside of an acceptable range relative to the interquartile range of all data points.
    Any outliers are then removed from aggregate volume and price calculations.
  9. What exchanges are included?
    Supported exchanges: bitmex, okex, binance, bitfinex, bit-z, hitbtc, kraken, lbank, gdax, bithumb, bitstamp, exx,, bitbank, poloniex, bittrex, exmo, gatecoin
    More exchanges are being added. Stay tuned.
  10. How do I add a token?
    For now, you can email us at
  11. Do you have historical data?
    Not yet.
  12. How do I keep updated with the latest changes?
    Check out updates
  13. How frequently does the data update
    Once per minute.
  14. I have a feature request / found a bug. How do I reach you?
    Thanks! Post feature requests here: OMC feature requests. You can reach us at