imToken and OpenSea Collaborate on a Seamless Mobile NFT Experience

In addition to operating the largest marketplace for digital goods, OpenSea maintains the most comprehensive API for Ethereum NFTs, contracts, events, and more. As a result, OpenSea’s API powers the collectible-focused facets of Coinbase Wallet, Trust Wallet, Balance, CryptoGoods, ToknTalk, CKBox, Vault Wallet, Bitski, Portis, and Amberdata, among others. Today, we proudly announce that a imToken 2.0 has joined the ranks of applications benefitting from OpenSea’s API!

Specifically, we’re providing the data that allows imToken users to view their collectibles in their imToken wallet. When you load up your main address using your twelve word seed phrase and navigate to the collectibles tab, you’ll find your whole collection of NFTs waiting for you.

In addition to displaying a user’s NFTs, imToken 2.0 will allow users to view, send, and receive ERC-20 tokens. It also includes a slick QR scanner that will spare you the trouble of copying and pasting addresses.

What’s more, imToken 2.0 supports BTC and EOS, allows you to access any dapp (including OpenSea!), and even has a DEX built right in.

If you’re a developer and you want to get in on the action, check out how the OpenSea API makes it easy to retrieve and display the NFTs owned by a given account. Or if you’re a game developer and you’re more interested in seeing your work appear in users’ wallets, try out our crowdsale tutorial.

With imToken 2.0, imToken carves out a larger space for themselves in the mobile wallet space. Which mobile wallet do you use most? Coinbase Wallet? Trust? Vault? Share your thoughts on imToken 2.0 and its competitors below.

We partnered with Ember Sword to power their marketplace for in-game items

Today, we’re thrilled to announce a new strategic partnership with Ember Sword, a cutting edge massively multiplayer online role playing game.

Right now, we’re working closely with the Ember Sword team on custom versions of our marketplace and SDK. Soon, OpenSea’s technology will serve as the backbone of the player-to-player marketplace for collectible items inside Ember Sword.

From the start, Ember Sword recognized the importance of a secure and user-friendly in game marketplace for their game items. Faced with a decision between reinventing the wheel and leveraging existing tools, they chose the latter. We’re honored that OpenSea was their choice, and we’re proud to play a role in the Ember Sword story.

We like to think that our contribution reaches beyond Ember Sword’s marketplace, too. By leaning on OpenSea’s tools, the Ember Sword team gets to spend more development time building features and tweaking balance. As a result, the whole game improves.

A New Type of Marketplace

The first-of-its-kind Ember Sword marketplace will allow players to freely trade their in game premium cosmetic items, like skins and emotes, using Ember Sword’s premium currency — the PIXEL Token. PIXEL is scarce, useful, and ERC 20 compliant, which means players can sell the PIXEL Token for ETH or USD on decentralized exchanges, turning their in game items into real world profit.

In traditional video games like Fortnite and Counter-Strike, an endless supply of identical skins dilutes the value and meaning of any individual item. Cosmetics in Ember Sword, on the other hand, all have a unique identity and history. Ember Sword’s items exist in finite supply, rewarded to players through in-game activities and competitions. Unlike a CS skin or WoW gold, Ember Sword items are true digital collectibles, owned by the players and subject to real economic forces.

Why we’re partnering with Ember Sword

The Ember Sword is building the next generation of Free to Play MMORPG player experiences. At a fundamental level, they’re rethinking what an MMORPG is and can be. In this new world, players have a real and permanent stake in their game.

But players need more than just skin in the game if a project is going to thrive. An MMORPG has to provide a compelling experience and not just an enticing investment opportunity if it’s going to succeed in the long run. That’s exactly what sets Ember Sword apart from the crowd. It’s a beautiful, engaging game with a marketplace built on NFTs, not an NFT project with an ancillary game wrapped around it.

In Ember Sword, tokenized ownership of game items enables a fair, thriving, no-pay-to-win gameplay environment. Players can securely trade sound digital goods in a peer-to-peer marketplace and the developers can earn enough money to keep building. It’s a thrill to play a central role in the monetization strategy of such an innovative and professional project.

Learn More About OpenSea

First of all, come check out the marketplace for yourself! Follow us on Medium and Twitter to keep up with the latest announcements. And if you have questions or just want to chat, drop by our Discord server.

Learn More About Ember Sword

The Ember Sword PIXEL token private presale is going on right now, with the public crowdsale taking place in Q2, 2019.

To participate in the private presale, contact the Ember Sword via their website or reach out directly to sune(at)

Learn more by reading their Business Pitch and Game Pitch, or check out their Introduction to Ember Sword — the Blockchain MMORPG.

Connect with and Join the Ember Sword Community Discord | Telegram | Reddit | Twitter | Facebook

Opera and OpenSea Collaborate on Browser-Integrated Cryptocollectible Experience

In addition to operating the largest marketplace for digital goods, OpenSea maintains the most comprehensive API for Ethereum NFTs, contracts, events, and more. As a result, OpenSea’s API powers the collectible-focused facets of Coinbase Wallet, Trust Wallet, Balance, CryptoGoods, ToknTalk, CKBox, Vault Wallet, Bitski, Portis, and Amberdata, among others. Today, we can announce that a venerable citizen of Web 2 has joined the ranks of applications benefitting from OpenSea’s API: Opera.

Specifically, we’re providing the data that allows users of Opera’s new browser-integrated crypto wallet to view their collectibles in both the Opera Developer browser on desktop and in the stable release of Opera’s mobile browser. Check out Opera’s promo video to get a sense of what the Opera crypto wallet experience is like.

In addition to displaying a user’s NFTs, Opera’s crypto wallet will allow users to view, send, and receive ERC-20 tokens. Opera’s approach prioritized both convenience and security; according to Opera’s crypto wallet page,

“The Opera wallet keeps a high level of security and gives you full control of your funds and collectible keys as they are all stored on your smartphone. The wallet also uses Android’s secure system lock, which makes transactions on the blockchain easier as you don’t require any additional PIN codes or passwords.”

In the words of Opera top brass,

“Our hope is that this step will accelerate the transition of cryptocurrencies from speculation and investment to being used for actual payments and transactions in our users’ daily lives.”

At OpenSea, we’re proud to be part of that transition!

If you’re a developer and you want to get in on the action, check out how easy the OpenSea API makes it to retrieve and display the NFTs owned by a given account. Or if you’re a game developer and you’re more interested in seeing your work appear in users’ wallets, try out our crowdsale tutorial.

Opera won the race among major browsers to integrate a crypto wallet, which means that Opera’s 182 million monthly active mobile users just got that much closer to taking part in the Web 3 revolution. Who will be next? Share your thoughts on the Opera crypto wallet and your predictions about which browser will be next to take the plunge in the comments below.

Introducing eBay-style Auctions for Crypto Collectibles

What’s the best way to sell crypto collectibles? Their value is based on market demand, which is hard to measure, and there’s no “Kelley Blue Book” for pricing them. So you have to put them on auction, and until now, only the seller was setting the price curve.

Now, on OpenSea, you can let buyers compete to find the best price for your item or bundle of items!

Two main types of auctions

There are two main types of auctions: “English” and “Dutch.” The paradigmatic type of auction that you see for existing crypto collectibles like CryptoKitties, Etheremon, and MyCryptoHeroes has been the Dutch Auction. In this form, a seller lists an item for immediate sale, but sets the price to change over time. Buyers make purchases hoping they see these listings at the right time.

But the type of auction that most people think about is the English Auction, where you list your item for a minimum price and accept the highest bid after a set time period. This is the type of auction made popular by eBay* that you see for physical items there, and now it’s available on OpenSea. Here’s what the two price graphs look like, side-by-side:

Why English Auctions can be better

The primary benefit of an English Auction is that the seller doesn’t have to know the market value of their item when they price it; instead, they can low-ball a guess, and the market will drive the price up to the seller’s benefit.

What about buyers? Buyers love English Auctions, which feel like games with winners and players. Most importantly, as long as the starting price is low, buyers don’t have to know the market value.Dutch Auctions essentially require buyers to know the true value because buyers purchase hoping that they saw the item at the right time, and therefore the right price. In reality, determining price involves a conversation between more than just one buyer and one seller, and English Auctions enable that.

For example, let’s say a CryptoKitty with a market value of 0.5 ETH is currently on sale for 1 ETH and declining to 0 ETH over 2 months. Along comes a buyer who doesn’t know how much it’s worth. The buyer might purchase the item out of fear that someone else will snag it later, even though it’s currently too high of a price. In an English Auction, the seller will list the CryptoKitty for a low-ball guess (e.g. 0.4 ETH), and if demand for the kitty truly is high, then its price will naturally rise to 0.5 ETH as buyers outbid one another. It’s a multi-party conversation about value where every party has skin in the game, which has until now hasn’t had a first-class experience on OpenSea.

Gas-free for both buyers and sellers

Why not just ask buyers to make offers on your items, like OpenSea has allowed for months? Because an English Auction guarantees that the highest bidder will win the item when the auction expires, regardless of whether the seller is awake or not. And we’ve added a nice feature that makes this guarantee possible: OpenSea will auto-match the highest bid with the auction, so neither sellers nor buyers have to pay gas!

How does this work? It’s a three-step process. First, sellers create auctions by creating and signing an off-chain sell order, which OpenSea stores off-chain with the OpenSea API. This involves no gas as long as the seller has already approved those assets for trading.

Second, buyers create buy orders in the same way, which also only requires signatures. To bid on an item for sale in an ERC-2O token like DAI (a stablecoin pegged to $1 USD), they just need to approve the token and have enough of it. If the item is on sale for ETH, buyers need to wrap ETH into W-ETH, which can be done when bidding or any time using the W-ETH Station on OpenSea. This allows the trade to happen when the buyer is asleep, without the need to escrow ETH into some non-standard contract, and the seller will receive W-ETH instantly that they can unwrap into ETH at their discretion.

Finally, when the sell order expires, OpenSea’s servers look for the highest buy order that’s at least the minimum amount specified by the seller, and pays the gas to match the two together. For the first time ever, no user (not even the order taker) needs to pay gas to fulfill the final transaction!

Bundle Offers

With this new auction ability comes another highly requested feature on OpenSea: making offers on bundles. Now buyers will be able to suggest prices they’re willing to pay for your bundles on Dutch Auctions and fixed-price listings.

As an added bonus, if your bundle expires or you cancel it without finding a buyer, it’ll still be available for buyers to find and make offers! And a new “Re-list this Bundle” button makes it easy for you to quickly bring it back to auction and renegotiate a price. We hope this will make it easier for everyone to trade complex bundles and talk $ to sellers without spamming them.

Give it a try!

We’re very excited about English Auctions, so give them a try and put an asset on sale by visiting your account: OpenSea doesn’t escrow your items, so you never lose hold of them!

If you’re a developer, we’ve also added support to the OpenSea SDK for programmatically creating English Auctions, querying for them, and bidding on them. You can even add an address as a referral address and claim referral bounties, both through the SDK and by creating referral links.

For more information, or if you have any feedback, contact us on Discord or email us at [email protected]!

* Despite the widespread belief that all eBay listings are English auctions, most eBay listings are fixed-price now.

Insights on CoinDesk’s 10 Most Influential Crypto Collectibles

Each year since 2015, CoinDesk has released its annual “10 Most Influential in Blockchain,” a series of articles designed to profile the people making the biggest impact on the cryptocurrency and blockchain world (for better and for worse). This year, they decided to enhance the format and celebrate the rise of NFTs by issuing a series of collectible ERC-721s corresponding to the listed influencers.

The origins of the listicle reach back past living memory, but it wasn’t until recently that their effectiveness as clickbait made them pervasive. They’re even cropping up in the venerable New York Times. While they’re often dismissed as cheap and formulaic, the effectiveness of the listicle is undeniable. Buzzfeed’s 200 million unique monthly visitors can’t be wrong. So, in the spirit of number-driven journalism, we’ve collected some statistics from the project.

First, let’s recap who made the list:

The Auctions

CoinDesk issued 3 NFTs per personality, then created Dutch auctions on OpenSea for each of them, prices starting at 0.1 ETH and declining to 0.01 ETH. Incidentally, before the auctions had even begun one OpenSea user had already placed 4 bids on the items. From the time the first item was listed to the time the last item sold, 6 hours and 20 minutes elapsed. They all sold at prices within a few thousandths of 0.096 ETH. However, there have only been 5 sales after CoinDesk’s initial 30, the highest of which was for 0.75 ETH.

Remarkably, a single address now holds over 1/3 of these collectibles and the remainder of the supply is held by just 6 other addresses. In an effort to gain a favorable position in the secondary market, these power users may have calcified the market instead.

If you’re looking to make the cheapest possible investment in the series, 2 ETH will buy you any one of three collectibles. And if you’re curious about the other end of the spectrum, the highest asking price, shared by two tokens, is 110 ETH. If you’re looking to acquire the full set, you can also save yourself some time by purchasing a bundle containing tokens 1–10.

5 of the 10 most valuable stamps in the world earned their positions by virtue of their status as misprints. But NFT collectors don’t seem to put as much stock in such things if an absence of sales of the misprinted Elizabeth Stark card is a trustworthy indicator.

Popularity contest

The most viewed item? Brenna Sparks, of course. Be sure to scroll down and check out the offers on the card linked in the previous sentence; there’s an offer for 69 DAI from an unforgettably named OpenSea user. Brenna’s popularity on OpenSea is consistent with her popularity elsewhere; she’s by far the most searched name on the list. Only Nouriel Roubini can occasionally compete with her popularity.

In addition to the NFTs discussed above, CoinDesk also partnered with Dapper Labs to release 17 special edition CryptoKitties and with ChibiFighters to release 6 limited edition Chibi Fighters. Check out the selection of 7 Catzys, 10 Purremy Allaires, 3 battling Brennas, and 3 Glens on OpenSea!

By issuing a set of NFTs that correspond to items on the list, a publisher is not just creating a list that might become irrelevant in a week — it’s initiating a market with greater longevity and cross-platform activity. Would you buy an NFT of this type to socially signal your endorsement of its subject? Would you buy an NFT like this if it gave your comment on the article a top slot? How about if it gave you some power in selecting the next round of influencers? Comment below if you believe that CoinDesk hasn’t meaningfully expanded on the listicle format and let us know why!

To see what else is brewing in the world of NFTs, join us over at the OpenSea Discord server, follow us on Twitter, or check out the rest of our work on Medium. Let us know who should have made the list!