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JUL 19, 2017

Introducing Daily Ether Auctions

Introducing Daily Ether Auctions

We launched our first daily bitcoin auction on September 21, 2016. Encouraged by its success and ability to match buyers and sellers at a single moment of the day, we launched an East Asian Timezone daily auction on March 21, 2017. We would now like to offer the same kind of price discovery we have facilitated for bitcoin traders over the past year for ether traders. As a result, we will be launching a daily 4:00 p.m. Eastern Time ether auction starting on Friday, July 28, 2017! The mechanics will be the same as our bitcoin auctions; please see for details.

Daily auctions are universally implemented by traditional asset exchanges like the New York Stock Exchange, Nasdaq, and Bats. They increase price discovery and transparency, and they reduce costs across the board by making sure that buyers and sellers don’t miss each other during the trading day. In addition, we are confident that our Auction will bring you the benefits of over-the-counter (OTC) trading without the overhead, hassle, and lack of transparency.

How Do Auctions Benefit Gemini Customers?

Auctions aim to facilitate high volumes of trading between customers at a fair price by matching the maximum quantity to be bought and sold. Auctions provide the following benefits to our customers:

  • Greater Price Discovery: Auctions focus market participants and economic information at a single moment in the day, resulting in better price discovery.
  • Deeper Liquidity: Execute larger trades with less market price impact or “slippage.” Because Auctions are at a single moment in the day, more buyers and sellers are able to converge and provide more liquidity on both sides of the market.
  • Mark-to-Market Benchmark Price: Auctions provide an official 4:00 p.m. ET end-of-day price for marking assets to market (e.g., for accounting purposes or for calculating returns).
  • Instant Settlement: Auction trades settle immediately and funds are ready for immediate transfer (unlike OTC trades that can require phone calls, emails, specialized paperwork, risk during funds transfer, etc.).
  • No Counterparty Risk: Auction trades settle immediately from pre-funded accounts, eliminating the risk that your counterparty will back out of a trade (unlike OTC trades which are typically not pre-funded).

How Do Auctions Work?

All eligible orders are filled at the final auction price. The final auction price of each Auction is determined by finding the price at which the greatest aggregate buy demand and aggregate sell demand from all participating orders can be filled (i.e., the price at which the largest quantity can trade). The mechanics of this auction are very similar to the closing auction (or “closing cross”) on the major electronic U.S. stock exchanges (e.g., Nasdaq, NYSE Arca, Bats). For a more detailed discussion, please see our Marketplace page.

How Can You Participate in Auctions?

Easy! Customers can enter Auction-Only (AO) Market and Auction-Only (AO) Limit Orders to buy or to sell beginning well before the Auction time.

Beginning 10 minutes before the Auction time, indicative auction prices are broadcast via both our market data API and our website frontend. A new indicative auction price is calculated every minute until the Auction time, based on the order book at that time, and every 15 seconds during the final minute. (These indicative prices are calculated by simulating the auction process for the order books if Auction were to occur at that time.)

How to Buy or Sell Large Quantities in Gemini’s Daily Auctions:

Leading up to auction, liquidity providers place Auction-Only Orders on both the bid side and offer side of the market . These liquidity providers often compete for greater influence in the auction by tightening these spreads. That ultimately benefits all Auction participants.

These liquidity providers also monitor the indicative auction prices. If they observe new liquidity demands in a particular Auction, they stand ready to modify their own Auction-Only Orders in order to facilitate liquidity demands. If you want to buy or sell a large quantity during one of the Auctions, we therefore recommend that you submit it approximately 10 minutes before the Auction time. This will give liquidity providers time to respond and to give your order access to increased liquidity.


If you have any questions regarding Auction mechanics or the benefits that Auction may provide you, please check out our Marketplace page for a detailed description, or contact

Onward and Upward,

Team Gemini


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