The 'balance' is already formated for you with the decimal provided. I find this to be an easy method to get my balance for my alt cryptocurrencies. Most of the developers havn't even created a stable wallet yet! I've seen many people using geth full time to check their balance, little much in my book. Use the API and be free. This is perfect for applications that just want to show the ERC20 token balance in plain text. No JSON parsing needed! Home Documentation Status.
CoinName CJX 0. Works for any Etheruem Token TokenBalance. Easy to Implement Token Balance has an increadible easy API for ethereum contract tokens and I recommend you try to implement it in your next application. ERC20 Tokens Many people don't know the true power behind the Ethereum blockchain, you might have other crypto currencies in your wallet that you didn't even know about.
Etherscan is the Ethereum blockchain explorer. You can get all kinds of information regarding Ether coin, tokens, smart contracts, accounts, etc. So all the operations that Web3 can do can be confirmed by looking into Etherscan. The homepage displays the information related to Ether coin. You can get information regarding tokens by searching in the bar.
At the time of writing, the stats were as follows:. The price is a matter of trading and blockchain has nothing to do with it. It is determined by supply and demand. To get a count of all the transactions, you will need to get the transaction count from each block in the chain. Ethereum does not directly provide the total transaction count. Etherscan must keep this count in its database separately. This is because all the eth branch functions make network requests on the chain. They return a promise and the then function is used to get the response.
Here you can see some useful information about a single block. First of all, it is the latest block at the time of running the code. You can also see the gasLimit and gasUsed. This amount is multiplied by a base gas fee, which is baseFeePerGas , to get the total fees. In this object, baseFeePerGas is represented in hexadecimal. You can use the web3. Remember, all the amounts are stored in wei unit in this chain.
So, the per-gas fee for this block is Wei. But how much gas was used that is listed in the gasUsed key? To get the total gas fee of this block, we can use the following:. There are other parameters, such as difficulty , which determines the complexity of the puzzle the miners need to solve. This keeps on increasing and making it difficult for miners to mine the coins.
For this block, the difficulty is 8,,,,, The object also lists the block number in the number key. This means that 13,, blocks have already been mined. Run the loop over all blocks to get the total transactions in each of them and then add them to get the total transactions in the Ethereum chain.
For all additional blocks, you can hit the API and add the transactions to the stored count. To get the current gas price of the network, you can use the getGasPrice function of web3. Everything in blockchain has an address represented in a SHA3 string. This could be an account, token, coin, smart contract, or anything else.
If you have an account on the Ethereum blockchain, it must be represented in a unique SHA3 string. These are the top 10 accounts holding Ether coin. You can see that there are smart contract accounts too. Contracts can also hold the coins. We will use the third account from the list, which has a name tag of Binance 7. You can see the address and private key. Although I am not going to use this account for anything but to safeguard others from doing transactions through this account, I have obfuscated some characters.
Do not add any coin or token to this account as it will stay orphan. Suppose you are developing an application and want to test it. If you test it on live chain, you will have to pay a gas fee for any operation you perform. These operations are recorded as transactions and thus require gas fees. To solve this issue, you can run your private chain locally using Ganache and deploy your application on it. You will need to pay the gas fees, but you will have all the Ethers free of cost.
We already installed Ganache and saw that it is running on port on localhost. We are instantiating Ganache in the web3G variable because web3 is used for the Infura live chain. Also, there are few accounts already created by Ganache. Here we will need to use the personal property of Web3. Here, we will send 1 ether from the first account to the second account in the list. As you can see, the gas used was 21, — although we put 6,, because the network takes what is spent.
The first account has a balance of You can get more information in the Blocks and Transactions tabs:. Ether is a coin and everything else implemented on the chain using smart contracts are tokens. The tokens that are used for trading need to be implemented using the ERC protocol. This defines the set of rules to follow. When you open it on Etherscan, you will find information such as contract address, total token supply, holders, etc.
If you click on the contract address outlined in red , you will get useful information about it. But to put it simply, it is the code of the application. This code is written in Solidity language. This ABI file holds the function definitions, which were declared in the Solidity code. You might be thinking that if the Solidity code is not specific to BNB, then how did it get its symbol, total supply, and all other properties?
This information was passed as arguments to the constructor. These different bytecodes are joined together into a single string. We know that the contract source code is compiled into bytecode and ABI. So its bytecode looks like this:. This bytecode is a low-level representation of Solidity code for smart contracts. To pass the arguments to a Solidity constructor, the argument bytecode is appended to this contract bytecode. To work with contracts in Web3. We already learned what ABI is and how to get it and we know the contract address too.
We need to instantiate it and store it in a variable. The format of the function is as follows:. Now we can perform different operations over this newContract object. The various methods are defined in the newContract. You can run it on the node and check the list:. In this tutorial, we covered the basics of Web3. The blockchain world is massive, rapidly evolving, and full of possibilities.
Instead of guessing why problems happen, you can aggregate and report on what state your application was in when an issue occurred.
In this article, we will showcase how to use are simple GraphQL APIs to get Ethereum token balance for one or more addresses. As explained here, you can see token balances with their web UI (the token tracker dropdown). Does their API provide equivalent functionality? Great for Ethereum applications. Same reliable data with better rate limit. 10 calls/second limit; Up to , API calls per day; All existing community.