OpenSea provides a one-stop shop for creating your own customizable marketplace for your ERC721 or non-fungible token (NFT) project. Allow users to smoothly buy and sell your items, get custom stats and analytics, and earn revenue when your items get traded.
I get this error when trying to buy an item - Ethereum network rejected the transaction. Item being locked or untransferrable - Exact error: gas required exceed allowance or always failing transaction
Posted by Alvaro A Pinzon C Pinzon 2 months ago
rinkeby-api.opensea.io/asset_contract/0x1C4C47F305deB95c775971F4D00cD76d90007332/create/:1 Failed to load resource: the server responded with a status of 500 () Reply More Options GET /asset_contract/0x1C4C47F305deB95c775971F4D00cD76d90007332/create/ HTTP 405 Method Not Allowed Allow: OPTIONS, POST Content-Type: application/json Vary: Accept { "detail": "Method "GET" not allowed." }
Posted by Anou Mana 2 months ago
Hi, I'm trying to create a burnable ERC721 token. So far I've called the openzeppelin ERC721Burnable contract and added the functions as well. My contract deploys just fine, but I am having trouble understanding how to 'trigger' the burn. In the the tutorial we are using 'mint.js' to mint tokens, could a similar thing, like 'burn.js', be created to handle burning? Is there an implementation of this by the opensea team (probably asking for too much here, ha). Is this the preferred implementation to burn, since we are using mint.js to mint? How would I pass the correct token ID to burn?
Posted by jay sun 2 months ago
Hi There, I have a Dapp whose metadata resides on blockchain itself. We do not use external URLs for our metadata as we want it to be public and changes can be tracked. We have 3 JSONs that can be fetched using a smart contract function `getWeaponMetaData(weaponid)`. How can I get listed here and see my data as well? Don't you guys support fetching data directly from the smart contract?
Posted by Prashant Prabhakar Singh 2 months ago
First of all, loved the tutorial and the project! I'm new to smart contract developing and followed along just fine. I used the open-sea-creature api (https://opensea-creatures-api.herokuapp.com/api/creature/) to populate the metadata of my NFT's (success!). I then tried to change the URI in Creature.sol to point to my own API. I then tried to migrate the contract w/ truffle, but cant get it to use the updated URI. I realized, since the blockchain is immutable does that mean I cannot change anything in the Creature.sol contract? Basically, if you're making a project, once you've set the API link it's over and cannot be changed right ? I'd have to deploy a new smart contract to mess with these attributes?
Posted by go0t 2 months ago
Some of our new cards seem to be missing metadata, but the json file is present on our server where it should be. Did maybe something go wrong when the new tokens were minted and the tokenURI didn't stick? Can you guys see a tokenURI for this one: https://opensea.io/assets/0x4e01124b127ae8d0573efc4a026d9d7505fcd5bb/206 Thanks
Posted by Kevin Phillips 3 months ago
The OpenSea validator returned a message that my ERC-721 contract on rinkeby did not meet the standard. I'm using Zepkit and I was pretty sure it was legit. I looked for a validator, but I only found one for mainnet. Is there a way to get more detailed info for troubleshooting?
Posted by Chris Lumpkin 3 months ago
Hi, Let's say I created an ERC 721 token that is an 'avatar' for an RPG-like game. If I wanted to update the token with experience and other attributes, can this be done with ERC 721 or are NFTs not able to be updated once they're deployed on the blockchain? Thanks
Posted by Karl 3 months ago
Working on a collectible card game based on ERC721 with the metadata extension. When a person "collects" a warrior, it is successfully "minted" to the owner and the tokenURI is successfully set to the path of the json file with the metadata (name, description, image path) in it. My question is how do I now get that metadata (especially the image) so I can show it on my website? I have a page that displays the warriors the person has collected. On that page I'm successfully getting the info for the warrior structs and painting to the page. Here's that code I have in my app.js file: function getWarriorsByOwner(owner) { return new Promise(function (resolve, reject) { App.contracts.WarriorFactory.deployed().then(function(instance){ instance.getWarriorsByOwner.call(owner) .then(function(warriors){ resolve(warriors); }); }); }); } function displayWarriors(ids) { $("#warriors").empty(); for (id of ids) { // Look up warrior details from our contract. Returns a `warrior` object getWarriorDetails(id.toNumber()) .then(function(warrior) { // Using ES6's "template literals" to inject variables into the HTML. // Append each one to our #warriors div $("#warriors").append(`<div class="col-md-4"> <div class="card mb-4 shadow-sm"> <img class="card-img-top" src="" alt="Card image cap"> <div class="card-body"> <h5 class="card-title card-name">${warrior[0].toString()}</h5> <strong>Attack</strong>: ${warrior[1].toString()}<br/> <strong>Defend</strong>: ${warrior[2].toString()}<br/> <strong>Strategy</strong>: ${warrior[3].toString()} <strong>Cards Issued</strong>: ${warrior[4].toString()} <strong>Total Cards</strong>: ${warrior[5].toString()} </div> </div> </div>`); }); } } So, if a person owns warrior 0 in the warriors array, I get all the attributes for that warrior. If I call tokenURI(0) I also see the correct path to the json file with the rest of the info in it that I don't keep on chain. What would I need to add to also read the correct json file and set the image source here in the above: <img class="card-img-top" src="" alt="Card image cap"> I'm very new to this which means I know just enough to be tempted to do very stupid things, the above may be an awesome example of just that. Any advice? Thanks, Kevin
Posted by Kevin 4 months ago
somehow my metadata is not showing up and i don't know why: https://opensea.io/assets/0xa87a42351e2ad8c613370f4ef506d2d1d8b1e4f0/1 the tokenURI: https://von-aesch.com/tokenURI.php?colors=VA_DIAMONDS-E2635C-E2635C-BCD78D-BCD78D-BCD78D-BCD78D-E2635C-E2635C-BCD78D-BCD78D-BCD78D-BCD78D-BCD78D-BCD78D-BCD78D-BCD78D-BCD78D-BCD78D-BCD78D-BCD78D how can i debug the metadata? is there an opensea parser to validate it?
Posted by KM 5 months ago
Hi! Like it talks about in this thread https://github.com/ipfs/ipfs/issues/181 what are the chances of OpenSea supporting generic IPFS URLs of the format fs:/ipfs/<hash> or /ipfs/<hash> in the tokenURI calls of our ERC721 contracts?
Posted by Wil Bown 6 months ago
Any good starting points for where to learn how to generate/create the metadata json objects for the tokenURI to point to? I know that if I have a dapp at http://mycardgame.com and a tokenId of 6 that it would point to something like http://mycardgame.com/cards/6 . What I need help learning is how do I create that json for card 6 when the token is minted? I suspect that I may not even know enough about that to have even asked the question the right way...
Posted by Kevin Phillips 7 months ago
Complete newbie here so this is probably a dumb question. If I'm building a card game and the "characters" have different starting level, attack, etc. attributes, and I want the characters to be able to "level up", would it be feasible to store those in the metadata json file for the character? I've messed around with solidity a bit and have been able to change attributes for a character that I store in a struct, but am wondering if the json for a character could also be updated by javascript or something of that nature. Seems if you could do that it would keep transactions on the blockchain down (saving gas). Thanks in advance for any advice. Kevin
Posted by Kevin Phillips 7 months ago
Hello, I am working on adding the metadata of a token, should I use setTokenURI function from the contract? I tried several times of putting json data using it, but it does not work, it seems that I need to put a url in stead of actual json data. May I know if I need to host a website that shows the json data and then use the function in the format of setTokenURI(ID, "http://xxx.com/") please? If it works like this, what happened if the website is down? Thanks!
Posted by Jack 8 months ago
I'm testing my NFT at your platform, but there is on issue - unicode symbol not showing correctly. for example the name of the contract: https://rinkeby.opensea.io/assets/0x85e3dcfa057acfc072234de9a33c15194304c37b/1 your system shows: "â CRYPTOHEROES GAME â" but it should be "⚔ CRYPTOHEROES GAME ⚔" Can you fix it?
Posted by Mikhail Semenkin 8 months ago
Hi, this is the error that shows the Pragma Editor with the Deploy option after paste the codeof CryptoPuff Sample Contract= :2:1: ParserError: Source "openzeppelin-solidity/contracts/token/ERC721/ERC721Token.sol" not found: File not supplied initially. import 'openzeppelin-solidity/contracts/token/ERC721/ERC721Token.sol'; ^--------------------------------------------------------------------^ How can solve this? Thanks
Posted by capir 8 months ago
Hi, I looked at your FAQ page, and have a couple of questions. 1. What do you typically suggest for creating meta data file automatically when minting? Do we need to handle this inside the solidity contract (I assume not?) or make a hook to an external script that writes the metadata to a file while minting (and thus creating a new collectible image)? 2. For contract redeployment from v1 to v2, for instance, how can we easily move all v1's minted token data to v2? Moving all these v1 transactions to v2 causes additional gas, correct? Is it suggested to just read the token data from v1 and just import to v2 or?!? Any suggestions are welcome! Thank you for previous responses!
Posted by Mark 10 months ago