Cryptocurrency api javascript
We assess the five APIs according to 11 criteria, so you can decide which API is best for your use case and highlight some standout features and drawbacks of those on offer. Founded in , CryptoCompare is one of the most established data providers in the space, with several high profile clients including BT, Coinbase and Refinitiv. Featuring exchanges, the CryptoCompare API stands out for the widest array of endpoints - standing at over 80 - including streaming, minute and blockchain data from partner IntoTheBlock. Its Free tier offers all 80 endpoints, but is restricted to 1 day for its minute data and 3 months for hourly. However, it offers a generous , monthly calls as well as access to all 80 endpoints.
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From the front, these applications seem to be tools for managing accounts, converting Bitcoin to a fiat currency like USD and back, and transferring Bitcoin to other people, but are they more?
Disclaimer: I am not a cryptocurrency expert, nor have I taken part in any development around financial services or exchanges. I am an enthusiast of the subject material and anything obtained from this article should be properly tested and used at your own risk.
If you found something that could be improved, definitely share it in the comments. Create a project directory somewhere on your computer and execute the following commands from a CLI within that directory:.
I know I could have done all of the dependency installations in a single line, but I wanted to make them clear to read. So what are we doing in the above commands? The express , body-parser , and joi packages are all relevant towards accepting and validating request data.
The very popular bitcore-lib package will allow us to create wallets and sign transactions while the bitcore-mnemonic package will allow us to generate a seed that can be used for our HD wallet keys.
Finally, couchbase and uuid will be used for working with our database. Now we probably want to better structure our project. Add the following directories and files within your project directory if they do not already exist:.
All of our API endpoints will be split into categories and placed in each appropriate routing file. The config. In a realistic scenario, this file should be treated like gold and receive as much protection as it could possibly receive. The app.
The nodemon package will allow us to hot-reload our project every time we change a file. When it comes to developing our application, before we start worrying about API endpoints, we want to create our database and Bitcoin related logic.
Open it and include the following:. In the constructor method, we are establishing a connection to our database cluster, opening a Bucket, and authenticating. The open Bucket will be used throughout this helper class. Using the seed you can derive children and those children can have children, and so on and so forth.
The master variable in the createKeyPair function represents the top level seed key. Each user account will be a direct child of that key, hence we are deriving a child based on an account value.
The account value is a person number and every account created will get an incremental number. When we start creating accounts, they will start at one, leaving zero for the exchange or the web application, or whatever you want to call it. We are also allocating 10 possible addresses to this account. These addresses will do two possible things.
The first is that they will hold Bitcoin to transfer to other accounts and the second is that they will receive remainder payments, otherwise known as the change. Remember, in a Bitcoin transaction, all unspent transaction output UTXO must be spent, even if it is less than the desired amount. This means that the desired amount gets sent to the destination and the remainder gets sent back into one of these 10 addresses. Are there other ways or better ways to do this?
Absolutely, but this one will work for the example. To get a balance for any address we use or generate using the HD seed, we can use a public Bitcoin explorer:. The above function will take an address and get the balance in decimal format as well as satoshis. Going forward, the satoshi value is the only relevant value to us. If we have X number of addresses for a given account, we can get the total balance using a function like this:.
It takes a little more than just an address balance to be able to transfer cryptocurrency. Instead we need to know the unspent transaction output UTXO for a given address. If there is no unspent transaction output, it means there is nothing we can transfer and we should throw an error instead. Having enough to transfer is a different story. In the above function, we are taking a list of addresses and checking to see which one holds an amount greater than the threshold that we provide.
If none of them have enough balance, we should probably relay that message. The above function will get us all master keys, which will be useful for signing and checking value. You may or may not want to do the same, it is up to you. As of right now there is no data in our database.
The first logic step might be to create some data. Remember, accounts are driven by an auto incrementing numeric value for this example. We can create incrementing values by using a counter in Couchbase.
Remember, 0 is reserved for application keys. After we get our counter value, we add it to the object that was passed and call our insert function, which in this case generates a unique id for us.
We might want to add an address for the user:. When adding an address, we first get the user by the document id. When the document is retrieved, we get the numeric account value and create a fresh keypair of our 10, options. Using a sub-document operation, we can add the keypair to the user document without ever having to download the document or manipulating it.
I am storing the unencrypted private key and public address in the user document. This is a big no-no for production. Remember all those stories you read about where people got their keys stolen? We can do that by using the Node. The above getAddresses function can do one of two things. Using a parameterized N1QL query, we can return the database results back to the client. We might do the following:. Given a particular account, we create a query similar to what we saw previously. If we wanted to we could have done an array operation instead.
With Couchbase and N1QL, there are numerous ways to solve a problem. Another important aspect is transactions. We need to store and query for that transaction information. Technically we did, but those functions were for checking the wallet balance, not the account balance. This is where some of my experience turns into gray area.
Every time you transfer Bitcoin, there is a fee involved, and sometimes it is quite expensive. Then you would be charged to withdraw and even transfer again.
Instead, I believe exchanges have a holding account similar to a stock exchange money market account. When you withdraw, it is just being subtracted. Going back to our getAccountBalance function. Deposits have a positive value while transfers and withdrawals have a negative value. Aggregating this information together should give you an accurate number, excluding your wallet balance.
Given the little that we know about account balances, we can try to create a transaction from our wallet:. If provided a source address, destination address, and amount, we can create and sign a transaction to be later broadcasted on the Bitcoin network. First we get the balance for the source address in question.
We need to make sure it has enough UTXO to meet the send amount expectation. If you wanted to get complicated, you could send from multiple addresses in a single transaction. If our single address has enough funds, we get the private key for it and the UTXO data. With the UTXO data we can create a Bitcoin transaction, apply the destination address and a change address, then sign the transaction using our private key. The response can be broadcasted. The first step is to make sure we have funding in our holding account.
We can execute that query that sums up each of our transactions to get a valid number. If we have enough, we can get all 10 of our master key pairs and the addresses. We need to check which address has enough funds to send.
Remember, single address transactions here, when there could be more. If an address has enough funds, we get the UTXO data and start making a transaction. This time instead of our wallet as the source address, we use the wallet of the exchange.
Remember, as we configured in the beginning, our endpoints will be split across three files which act as groupings. Here we have two endpoints, one for generating mnemonic seeds and the other for getting the fiat value of a Bitcoin balance.
Neither are truly necessary, but on first launch, it might be nice to generate a seed value to later save in our config file.
Assuming the request body is correct, we can call our createAccount function to save a new account in the database. Using the account id that was passed, we can call our addAddress function to use a subdocument operation on our document.
Now for probably the trickiest endpoint function. We can do the following:. The above will call both of our functions for obtaining balance, and add the results together to get one massive balance.
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We're a place where coders share, stay up-to-date and grow their careers. Continuous evolvement of cryptocurrency as a means of payment drives the need for multicurrency payment options on payment gateways. In this article, tkings and I will be sharing a great solution that works for implementing cryptocurrency payment with API. You can simply redirect your customer to the data. This is referred to as the CoinForBarter Standard. You can provide a redirectUrl to the request payload to redirect the customer to that url when the payment ends. You can also provide a webhook as seen here.
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Recently, there has been an explosive growth in the value of many cryptocurrencies, with huge volumes of trades occurring in cryptocurrency exchanges nearly every single second. This growth has lead to increased attention and investments from individuals and institutional investors into cryptocurrencies and their underlying technology Blockchain. A crypto exchange API is a service to interface with cryptocurrency exchanges like coinbase. It allows users either customers of the service or developers to interface with cryptocurrency exchanges, execute trades, pull data, and receive data in real-time. Many cryptocurrency exchanges have exposed their APIs Application Programming Interfaces to enable developers to integrate with their platform. Just like in financial systems, security is also essential for APIs. API Providers need protection against hackers and malicious users. Our primer on API security gives a gentle introduction to this topic.
Before starting with the code I would like to say this tutorial is for a beginner level. The idea is to get started with GraphQL in a gentle and simple way, and in future parts, we are going to make our API more complex. From the official site :. GraphQL is a query language for APIs and a runtime for fulfilling those queries with your existing data.
Blockchain is a commonly used term that has many innovations associated with it. The blockchain is, quite literally, a chain of blocks, where each block is a piece of information stored in a public database, the chain. One such blockchain is Ethereum, which takes the concept of a blockchain to a whole new level. Ethereum is a distributed ledger where users can conveniently agree upon code execution and data updates.
Hi, so I wanted to cover Nomics and our data and why we're different. We found that most price aggregators and most market data services are failing in a number of ways that I think we've solved for and I wanted to cover that first. A little bit about the company: we are an API first product company, so out of everything that we do our API comes first. We built the API before we built anything else. If you do go to Nomics that entire website was built with our API so anything you see on the website we have available but we also have a lot of data available that is not on our website. So I think perhaps the way to start this out is by talking about data and data quality.
The CCXT library is used to connect and trade with cryptocurrency exchanges and payment processing services worldwide. It provides quick access to market data for storage, analysis, visualization, indicator development, algorithmic trading, strategy backtesting, bot programming, and related software engineering. It is intended to be used by coders, developers, technically-skilled traders, data-scientists and financial analysts for building trading algorithms.
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Ooooh! This is exactly what it says. I love it when everything is in place and at the same time understandable for a mere mortal.