7
votes
Metamask - "Params specify an EIP-1559 transaction but the current network does not support EIP-1559"
According to a post here, the solution is surprisingly simple. One can switch back and forth between the Ethereum main network and another network such as Polygon or Avalanche, and then the issue just ...
- 633
4
votes
How to use Open Zeppelin subgraphs to query ERC721 balance?
As an alternative to the graph, you can also use API providers to query the ERC721 balance from EVM blockchains. For example, you can use Moralis getWalletNFTs API to do the same thing in a few lines ...
3
votes
How to get all the owners from an NFT collection?
All other answers give valid suggestions. If you are interested in how to query directly from the smart contract, you can leverage ERC-721's ownerOf methods.
This is a sample script base on web3JS:
...
3
votes
How to find total value in ETH of all NFTs owned by a user
If you like to get the user's NFT portfolio value, then you can use Moralis to provide you with such data.
Simply sign up to Moralis to get the API key and install the SDK:
npm install moralis
Then, ...
3
votes
Accepted
Why am I not able to deploy ERC721 contract to Avalanche Fuji?
Solidity 0.8.20 introduced the PUSH0(0x5f) opcode which is only supported on the ETH mainnet and not on any other chains. That's why other chains can't find the PUSH0(0x5f) opcode and throw this error....
- 2,215
2
votes
ERC721 Minting Randomness
I wrote a post using three different alternatives to create vrf numbers (Chainlink/API3 or Witnet). There is also a repo with the demo code.
https://medium.com/coinmonks/schedule-randomness-with-...
- 1,383
2
votes
ERC721 Minting Randomness
The best practice you can implement Is to use Chain Link VRF V2 , for creating randomness. It will help you to create pure random numbers. But remember it will cost you link token as gas-fee. Bcz ...
- 50
2
votes
my nft image not showing in opensea testnet
In metadata, you gave image attribute the wrong value (x.png). If you want Opensea to find your image you should provide a public uri to your image as the value.
Usually you first upload the image to ...
- 1,069
2
votes
How to get all the owners from an NFT collection?
You can get all the owners of a collection using Moralis NFT API.
Here is a tutorial step-by-step: https://docs.moralis.io/web3-data-api/evm/how-to-get-the-owners-of-an-nft-collection
And this is an ...
- 319
2
votes
Calling "balanceOf" in a contract from another contract that imports it. Expected 1 Got 0
The problem is how you defined instance of nft contract in constructor. Your Code:
NFT public nft;
constructor (NFT _nftAddress) public {
nft = _nftAddress;
}
Try this instead:
constructor (NFT ...
- 350
2
votes
Accepted
I have an existing ERC721A smart contract deployed but how can I change public mint price and open that contract?
There is a function in your contract named updatePublicSalePrice(), which lets you update the price of your public sale.
function updatePublicSalePrice(uint256 _newPrice) public onlyOwner {
...
- 1,108
2
votes
Accepted
Is it possible to track marketplace sales for an ERC721?
Here is an example code on how you can track NFT transfer events on a smart contract using Moralis streams API.
import Moralis from "moralis";
const addStream = async () => {
if (!...
- 322
2
votes
Accepted
When someone sends me a erc721, does my wallet actually receiving it?
Yes, the same happens with the ERC721, you simply become the owner of that NFT in the contract.
As you can see in the contract below from OpenZeppelin, the transferFrom() function calls _transfer(). ...
- 169
2
votes
Accepted
The redundant `_from` parameter in the `transferFrom` function of an ERC721
Great observation on the _from parameter! I never noticed this before.
Here are the two key reasons for its inclusion in the transferFrom() function in ERC-721:
As you know, ERC-721 is strongly ...
- 2,331
2
votes
Accepted
Expected an event but reverts with reason `ERC721: caller is not token owner or approved`
This error happens because the owner of the token 0 must approve the NFT Marketplace and not the NFT contract.
Change this line:
await basicNft.approve(basicNftContract.address, TOKEN_ID)
to:
await ...
- 2,331
2
votes
Accepted
How is this solidity function calling another solidity function without referencing it?
mintSurfaceReacher function is called when you invoke requestRandomSurfaceReachT1 function is because the way API3 Airnode is configured to handle the requests.
When request is made to API3 endpoint ...
- 604
2
votes
Accepted
How to identify baseURI?
The baseUri would be the CID of the metadata folder. Your metadata folder contains the metadata of each image or NFT. And every metadata further contains the CID of the image.
Thus, use the metadata ...
- 1,108
2
votes
No field for creator in ERC721?
There is no notion of original creator in the ERC721 spec.
The creator could be considered the first person to mint a particular NFT, which you can get by looking for the Transfer event that had the ...
- 1,535
2
votes
How to get ERC 721/1155 and ERC-20 data?
You can get all the information you are looking for using Moralis API.
Here is an example of getting all the NFTs using moralis.
const Moralis = require("moralis").default;
const runApp = ...
- 319
2
votes
Accepted
Trying to get txn hash
You could use a WebSocket from a node provider to track the transfer event that all ERC-20 and ERC-721/1155 smart contracts emit when there is a token transfer.
Check this example in ethers v6:
const ...
2
votes
Accepted
Getting trading data efficiently
This data is not available readily on-chain, so it becomes difficult to get this kind of data.
QuickNode has this data available via their Graph API
You get historical NFT Trading data, marketplace ...
2
votes
How to retrieve all ERC721 tokens of a certain collection what a wallet ownes?
In order to do it without using the likes of Moralis. You need:
An RPC node
The contract address
The wallet address
The contract ABI
Then you can write a function like this:
async function ...
- 931
2
votes
Deploying a smart contract without private key
Short answer:
You can't deploy on their behalf if you don't have their private key or their signed tx.
You can achieve similar to what you describe by either one of the two methods:
Two ...
- 1,690
1
vote
Accepted
using image_data for opensea's metadata instead of image
Your assumption is correct; you don't need to encode more of the SVG, just the raw data.
My only additional suggestion is to put everything on the same line, in case you edited the SVG manually, ...
- 5,259
1
vote
Accepted
Decoding logs of Approval event with web3js results in error
dev advocate at Chainstack here.
When you retrieve the logs, you receive an array of different elements. Let's take the Approval event from an ERC-721 contract as an example since it's what you need.
...
1
vote
What to choose between memory and calldata for parameter of type bytes?
If you wanna save some gas and you know that the parameter won't get altered along the way, you can use calldata. Otherwise, go for memory.
- 313
1
vote
How do Opensea competitors (like Blur) subscribe to new NFT for-sale listings?
They are likely using the OpenSea Stream API.
There used to be public documentation for it, but the link now gives a 404.
However, there is still the GitHub repository for it, it seems that it is ...
- 36
1
vote
Accepted
Is it safe to use ERC 998 now?
Not safe to use. Please see this page https://eips.ethereum.org/EIPS/eip-998 and the STAGNANT warning at top.
This means there is no consensus on this protocol and it is very unlikely that if you ...
- 4,635
1
vote
How to Check if an NFT belongs to an address in solidity using only the address of the NFT instead of the tokenId
If I understand correctly, you wish to get tokenId that belong to some owner?
Most NFTs follow the ERC721 or ERC1155 standard, so you can check out which functions are supported here.
TO sum it up, ...
- 1,069
1
vote
Accepted
Contract mints token id 0 ERC721A
NFTs always go from 0 and then usually to 9999. Take BAYC for example: https://opensea.io/assets/ethereum/0xbc4ca0eda7647a8ab7c2061c2e118a18a936f13d/0
But if you wish to start with id = 1, then theres ...
- 1,069
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