Frequently Asked Questions

  1. What is OpenMarketCap?
    We’re believers that decentralization can be a positive force for change, however, we’ve been seeing a worrying trend as power has begun to concentrate around a few players. Decentralization gains from… well, decentralization. When the movement of entire markets can be driven by a few players and their black box methods, we need to start questioning how they make decisions, and how trustworthy they are. OpenMarketCap was borne out of a need to answer these questions by increasing transparency into the system. We provide a way to quickly compare information across markets so you can get a sense for price, volume and trustworthiness. The kicker? You decide what we track, from exchanges, to tokens, to details about projects.
  2. Where does the data come from?
    OpenMarketCap is powered by the people and exchange APIs. Currently, part of OpenMarketCap runs on top of these datasets datasets. If anything looks amiss, please contribute to them!
  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. Why was a market excluded from aggregation?

    Some exchanges don't trade to BTC or USDT. Since we only use the exchange rates within an exchange for more accurate conversions, we sometimes can't find a valid currency conversion Hence, we exclude it from our price aggregation calculation.

    However, this happens very rarely and on small exchanges with little volume, and hence will have little impact on the overall aggregate price.

  10. What exchanges are included?
    We currently support these exchanges: OpenMarketCap Exchanges. If you want to add a new exchange to OMC, please fill out this form: Add an exchange to OpenMarketCap.
  11. How do I add a token?
    Please fill out this form: Add a token to OpenMarketCap.
  12. Do you have historical data?
    If you are interested in getting access to the data, email us at hello@openmarketcap.com.
  13. I see incorrect data. How do I fix this?
    We want to bring more transparency to the cryptocurrency markets. If you see incorrect data, please fill out this form: Fix data on OpenMarketCap.
  14. How frequently does the data update
    Once per minute.
  15. I have a feature request / found a bug. How do I reach you?
    Thanks! Send us a note at hello@openmarketcap.com.