Parachain Slot Auctions

Parachain Slot

Parachain Slot


Polkadot & Kusama Parachain Auctions Explained

Parachain slot auctions take advantage of Polkadot and Kusama’s ability to give developers ways to create new crypto assets and decentralized applications (dapps) on top of its blockchain.

For a little background, Polkadot (DOT) and Kusama (KSM) are designed around two types of blockchains: 

- Relay Chain – The main network where transactions are finalized.

- Parachains – Custom blockchains anchored to the relay chain that use its computing resources to confirm that transactions are accurate.

To fairly determine which blockchains get to leverage the Kusama or Polkadot relay chains and their distributed computing power, the networks use Parachain Slot Auctions (or ‘Parachain Auctions’ for short). 

In its current state, both the Polkadot and Kusama relay chains can support up to 100 parachains, a number that is flexible and subject to change by governance vote over time. Parachain slot auctions are used as a means to decide which parachain will be connected to the relay chain. 

Of note, if a project does not need to lease a fully dedicated parachain slot, they can temporarily participate (on a block by block basis) with a parathread.


Parachain Graphic Image

How Parachain Auctions Work

There are many projects that intend to build on Polkadot and Kusama and each of them will need their own parachain slot to build upon. Rather than give the projects with the most funding a parachain slot, the Polkadot team came up with parachain auctions as a method to distribute the available slots in a more equitable manner. 

During a parachain auction, DOT or KSM holders can bond their cryptocurrency to support the project that they believe should receive a parachain slot. In return, the project may commit to airdrop tokens (or provide other rewards) to their supporters.

It is worth noting that, due to the permissionless nature of the protocols, any project may also purchase a parachain slot on the secondary market from anyone who won a slot through auction. 

Parachain auctions use a mechanism called a candle auction to randomize the exact moment the winner of an auction is determined.


Candle Auctions in Parachain Slot Auctions

Historically, candle auctions referred to the 16th century selling of ships, where a candle would be lit at the beginning of a bidding war, and the person with the highest bid at the time the candle went out would win the ship.

Similarly, parachain auction participants have a determined amount of time to place bids on the projects they wish to see get a parachain slot, and, in an effort to ensure fair bidding, the time at which the winner is determined is randomly decided on and retroactively applied to the projects with the most KSM or DOT support.

So, while there will be an official end to the auction, the candle auction refers to the random snapshot in time prior to the end that will determine the auction winner.

Of note, the parachain slot auction process should be nearly identical between Polkadot and Kusama, but some differences in the maximum slot periods and auction durations are expected.


how to participate in parachain auctions instructions
See Infographic
how to participate in parachain auctions


Crowdsourcing Support for Parachain Auction Bids

In addition to direct participation by a bidding project, Polkadot and Kusama enable blockchain projects to crowdsource support for their parachain slot auction bid. Through this process, (sometimes colloquially called a “Crowdloan”), DOT and KSM holders can bond these assets to the Polkadot or Kusama network to signal support for a particular project. If the project wins, the bonded DOT or KSM is locked by the network for the duration of the parachain slot, after which the tokens are unlocked and may be re-claimed by those who contributed.


Difference between Parachain Slot Auctions and ICOs

A key difference between parachain slot auctions and traditional ICOs is that those who contribute DOT or KSM to an auction and receive the project’s tokens via an airdrop may do so without transferring control of their KSM or DOT contributions to the bidding project team or any third party. In an ICO, users funds are sent to the project team who use them at their discretion. 

In a parachain auction, user funds can be returned if the project loses the auction and its campaign ends, or, if the project wins, once their access to the parachain slot expires.


Useful Parachain Slot Auction Resources

If you are interested in learning more about Polkadot and Kusama, please visit Kraken’s “What is Polkadot?” and “What is Kusama?” pages.

Ready to buy DOT or KSM? Check out our How to Buy Polkadot and How to Buy Kusama guides.

Also visit our Polkadot price chart and Kusama price chart.

Want more in depth information on specific cryptocurrencies and blockchain projects? If so, visit our Learn Center to further your education on this ever-growing space.

How to Participate in Parachain Auctions


Wondering where to participate in parachain auctions?
Learn how to participate in parachain auctions on Kraken:

  1. Sign up for a Kraken account
  2. Deposit or buy Kusama (KSM) or Polkadot (DOT)


  3. Navigate to Earn > Parachains


  4. Select the project you would like to support
  5. Enter amount of KSM or DOT to contribute
  6. Select contribute and confirm


Note: parachain auctions on Kraken are not available to residents of the US, Canada, Japan and Australia at this time.



How to buy KSM and DOT on Kraken


  1. Sign up for a Kraken account

    Enter a valid email address, username and a strong password to protect your account.

  2. Verify your account

    After providing your name, date of birth, country of residence and phone number, you can buy KSM and DOT with other cryptocurrencies. In order to use cash (i.e. USD or EUR), you’ll need to provide our experts with additional supporting documents verifying your identity. Read about our verification processes here. 

  3. Deposit cash or cryptocurrency

    You can fund your account in a number of ways. How you do so will depend upon your location and preferences.

  4. Purchase DOT or KSM!

    Once your account is funded, you’re ready to purchase your first KSM and DOT. At this point, you’ll also have access to our advanced charting tools, 24-hour global client support and the ability to utilize margin trading.

Parachain Auction FAQs

  1. How is a winner of the parachain auction determined?

  2. What happens to my KSM if the project I support wins a parachain auction?

  3. What happens to my KSM if the project I support loses the parachain auction?

  4. How much of the token will I get if the project I support wins?

  5. When will trading for project tokens start?

  6. Will I be able to withdraw my project tokens?

  7. Can I deposit KSM now?

  8. Can I use my staked KSM to participate in a parachain slot auction?

  9. I don’t have any KSM - how can I participate?

  10. Can I participate in the parachain auction from anywhere?

  11. Where and when can I find out if Kraken will be including a particular project in an upcoming parachain auction?

  12. Can I unbond my KSM before a parachain auction has ended?

  13. Can I cancel or edit the amount of KSM I contribute to a parachain auction?

  14. Will I be able to stake parachain project tokens on Kraken?