Check out the CryptantCrabs scuttling around OpenSea!

We’re excited to announce that CryptantCrabs are now tradeable on OpenSea! CryptantCrabs is a game where players battle, mutate, and collect crabby NFTs. Check out the selection on OpenSea here.

CryptantCrabs stands apart from its peer dapps in a few important ways. It has premium art, a noble pedigree, and a system of elemental relationships that will come naturally to players familiar with turn-based RPGs. The details of the battle system haven’t been revealed yet, and buyers shouldn’t expect to battle crabs until Q1 2019. If you’re the type of player that enjoys leveling up a stable of fighting creatures, this game is for you!

Why list your CryptantCrab on OpenSea?

Keep your items in your wallet while they’re on sale

You can create an auction for a CryptantCrab and still keep it in your own wallet while it’s on sale. No escrow required. That way, you can still battle and mutate you CryptantCrab while it’s on the market. You can learn more about our auction functionality here.

List CryptantCrabs without paying gas

Once you’ve set up your OpenSea account, you can list your CryptantCrabs without paying gas or waiting for confirmations from the blockchain. When you list a CryptantCrab, you just sign the listing with MetaMask and you’re good to go. When the buyer is ready to make the purchase, the buyer submits a transaction. When the transaction gets mined, the deal is done.

Passively accept bids for your CryptantCrabs

Not sure how to price your CryptantCrabs? You don’t have to! Other users can bid on a CryptantCrab, even if it’s not on sale, without any action from its owner. The owner can immediately fulfill these bids, receiving WETH in exchange for the CryptantCrab.

Get more exposure

Thousands of early adopters browse OpenSea for all sorts of game items, collectibles, artwork, and more. By listing your CryptantCrab alongside other collectibles, you gain a ton of exposure.

Interested in joining the CryptantCrabs discussion? Check out their Discord channel. Or to see what else is brewing in the world of NFTs, join us over at the OpenSea Discord channel.


Announcing our partnership with Hash Rush

We’re super excited to partner with Hash Rush to host the marketplace for their in-game items. The Hash Rush team is pushing the space forward with a real-time strategy PC game on Ethereum and is at the forefront of the blockchain gaming space. Hash Rush players grow and manage a small mining colony, battle monsters, and trade valuable items and resources.

Hash Rush is currently live in its alpha testing phase, with a 10,000-player closed beta beginning in December. We’re working closely with the team to build a customized marketplace for their items, as well as explore integrating the OpenSea SDK directly into the Hash Rush in-game experience.

We’ll also be announcing upcoming exclusive sales for Hash Rush in-game items on the OpenSea marketplace soon, so stay tuned for some exciting updates.

About the Hash Rush team

Hash Rush is a project from Latvian studio VZ Games, which brings together talent from Microsoft Games Studio, Ubisoft, CCP Games, NVIDIA and Xbox, with over 100 years combined industry experience. It’s been an absolute pleasure collaborating with them.

For more information, follow Hash Rush on Telegram, Twitter, Discord and visit their website. You can also sign up for their 10,000 player beta version here and check out their Indiegogo campaign.

As always, to keep up to date with announcements, we encourage you to join our Discord community and follow us on Twitter.


Introducing bundles

Sell all types of items, all at once

One of the most requested features from OpenSea users is the ability to sell a group of items all at once. Suppose you have twenty common CryptoStriker cards, three fancy CryptoKitties, or a bunch of Mythereum cards. While it might be hard to price each one individually, you know they’re probably worth a lot as a group.

Well, now you’re in luck! Today, we’re incredibly excited to publicly announce bundle sales—the ability to list all those items for sale at a single price. Here are the details:

List without gas, settle in one transaction

Listing is, as always, free—no gas required, except to approve new assets for trading! After initializing and allowing access to the OpenSea smart contracts with an initial transaction, your order is an Ethereum-compatible “signature” that seals your conditions for selling the bundle. When a buyer comes along to buy your bundle, they’ll submit an on-chain transaction, pay gas, and receive the items. And, of course, you’ll receive ETH in exchange.

One of the coolest advantages of this system is that your items do not leave your wallet when you create a bundle. This means that you can keep using them within a game until they sell. It also means that you can put valuable, individual items on sale in addition to bundling them with others, which you could use to help sell some of your less-valuable “floor” items. (Note: if an item in your bundle sells separately, your bundle will no longer be valid and get delisted.) We estimate that the max bundle size is roughly 100 items.

Advertise your bundle

Each bundle has a unique URL that can be accessed by anyone. For example, check out this box of jewelry, this complete MLB team, and this happy family. Included in your bundle is a name, description of why it’s awesome, and an optional link in case there’s an external location where people can learn more about the bundle.

Bundle across games

We saved the most exciting for last. While it might be fun to sell three CryptoStrikers all together, what could be more fun than selling three CryptoStrikers, a CryptoKitty, four Etheremon Adventure power-ups, and—to top it off—an exclusive War Rider lambo? (Although you might want to keep that lambo for yourself.)

Bundling for developers

Of course, if you’re building your own ERC721 project, you’ll want to take advantage of bundling as well. Every OpenSea marketplace (with a few exceptions for old implementations of ERC721) can now immediately take advantage of bundling. And any new ERC721-based asset will automatically be bundle-able on OpenSea’s platform.

Bundles are accessible for third-party collectible apps via the OpenSea API. Bundling is even baked into the OpenSea.js SDK, so you can bundle your items programmatically as well.

For developers, the combination of off-chain orders, bidding, bundling, and a host of other built-in marketplace features makes building your marketplace on OpenSea a no-brainer for any blockchain project—large or small. Learn more about our partners program here.

How to bundle, a user guide

Bundling is really easy! After the initial set-up transactions, it costs 0 gas to list a bundle. Here’s a quick walk-through:

1. Select your items

First, go to your account page and select “Sell a bundle”. Add each item that you want to include in the bundle.

2. Name your bundle

Give your bundle a name, description, and link so that users know why it’s worthy of being bought.

2. Set a price

The simplest way to sell is to set a fixed price that you’re willing to receive for the bundle. Alternatively, you can create a Dutch auction. In a Dutch auction, the price of the bundle starts at a specific. You can read more about different methods of selling items on our FAQ page

3. Approve access

If you haven’t set up your OpenSea account or approved access to your items, you’ll need to do that as a preliminary step. Don’t worry, we’ll walk you through the process and you’ll only have to do this once!

4. Sign the auction

The final step in the listing process is signing your order (which doesn’t cost gas!). Hit “Sign” on your Metamask.

5. Share your bundle far and wide

Your bundle has a unique URL, so you can easily share it with potential buyers!

The first bundles

We launched early access to our bundling feature to our Discord community. Since then, we’ve had over 125 bundles from our community. Here are a few our our favorites:

Why we’re excited

Markets for unique, user-owned digital items are still early, but they’re maturing every day. At OpenSea, we believe a big driver of these new economies is a robust, easy-to-use toolset for buyers and sellers. Bundling is one of those tools, and it’s really only possible with open protocols and standards like ERC721.

To stay up to date on more things OpenSea, sign up for our newsletter and join us on Discord. Check out available bundles here!