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OpenSea has once again regressed support for legacy ERC721 contracts (As of June 2022)


Due to the OpenSea regression in March 2022 affecting legacy contract listings we have re-enabled our basic marketplace entrypoints. We also have plans in the work to introduce a modern ERC-721 wrapper in the short term to get us back on Marketplaces. You can read more about this effort here.

Back in 2017, OpenSea did not exist and NFTs we're only traded within closed ecosystems. Much has changed today as the NFT formula converged and marketplaces were formed around the ERC-721 standard. Today we have multiple competing marketplaces and protocols that have created the movement we see today.

A Dutch auction is a market structure in which the price of something offered is determined after taking in all bids to arrive at the highest price at which the total offering can be sold. In this type of auction, investors place a bid for the amount they are willing to buy in terms of quantity and price.

Aether's core contract is attached to a sibling contract called AetherClockAuction to enable our own marketplace ecosystem. This allows all Aether properties to be listed in a trust-less dutch auction style. Our contract is based off of the CryptoKitties marketplace which has withstood the test of time.


If you want to list an item at a fixed price, simply use the same Start and End prices in your listing. Share your listing in our #marketplace channel on discord for more visibility to prospect buyers.

How to List


A property page url has the format of{token_id} (Example)

  1. Starting from the property page, click the gear menu, click Sell this will lead you to the Auction Page Sell

  2. In the Auction page, enter value in ETH (not WEI). Submit and wait for transaction to go through (costs gas). Sell

  3. Viewer side, they should see a Buy option on the property page Sell

  4. If you are the seller you can Unlist Sell


Here are some additional things to note about the sales auction flows.

  1. Ownership: The ownership of the NFT goes into the auction contract while its being listed but can be claimed back at anytime through Unlist
  2. Out of sync: Ownership takes ~10 minutes to sync on our application so property access may get out of sync. When in doubt, the block-chain is the source of truth.
  3. Royalties: There is a 5% royalty fee built into the contract.