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Ethereum Api

Web3: Ethereum Api For Haskell

Web3: Ethereum Api For Haskell

aeson (>=1.2.4.0 && <1.3), async (>=2.1.1.1 && <2.3), base (>4.9 && <4.12), basement (>=0.0.7 && <0.1), bytestring (>=0.10.8.2 && <0.11), cereal (>=0.5.5.0 && <0.6), cryptonite (==0.25.*), data-default (>=0.7.1.1 && <0.8), exceptions (>=0.8.3 && <0.9), generics-sop (>=0.3.2.0 && <0.4), http-client (>=0.5.12.1 && <0.6), http-client-tls (>=0.3.5.3 && <0.4), machines (>=0.6.3 && <0.7), memory (>=0.14.16 && <0.15), mtl (>=2.2.2 && <2.3), parsec (>=3.1.13.0 && <3.2), tagged (>=0.8.5 && <0.9), template-haskell (>=2.12.0.0 && <2.14), text (>=1.2.3.0 && <1.3), transformers (>=0.5.2.0 && <0.6) [ details ] (no votes yet) [estimated by rule of succession ] Use -f to enable a flag, or -f - to disable that flag. More info web3-0.7.1.0.tar.gz [ browse ] (Cabal source package) Package description (as included in the package) This is the Ethereum compatible Haskell API which implements the Generic JSON RPC spec. $ git clone && cd hs-web3$ stack setup$ stack ghci This library runs only paired with geth or parity Ethereum node,please start node first before using the library. Any Ethereum node communication wrapped with Web3 monadic type. > import Network.Ethereum.Web3.Web3> :t clientVersionclientVersion :: Web3 Text To run this computation used runWeb3' or runWeb3 functions. > import Network.Ethereum.Web3> runWeb3 clientVersionRight "Parity//v1.4.5-beta-a028d04-20161126/x86_64-linux-gnu/rustc1.13.0" Function runWeb3 use default Web3 provider at localhost:8545. > :t runWeb3runWeb3 :: MonadIO m => Web3 a -> m (Either Web3Error a) Quasiquotation is used to parse contract ABI or load from JSON file. TemplateHaskell driven Haskell contract API generator can automatical create ABI encoding instances and contract method helpers. > :set -XQuasiQuotes> import Network.Ethereum.Contr Continue reading >>

Myetherapi: An Api By Myetherwallet

Myetherapi: An Api By Myetherwallet

web3.setProvider(new web3.providers.HttpProvider('PUT_ENDPOINT_URL_HERE') // Request curl -H "Content-Type: application/json" -X POST --data '{"jsonrpc":"2.0","method":"eth_getBalance","params":["0x7cB57B5A97eAbe94205C07890BE4c1aD31E486A8", "latest"],"id":1}' // Result { "id":1, "jsonrpc": "2.0", "result": "0x231d5cd577654ceab3" // 647751843213568961203 } var web3 = new Web3(); web3.setProvider(new web3.providers.HttpProvider('web3.eth.getBalance("0x7cB57B5A97eAbe94205C07890BE4c1aD31E486A8").toString(); //Result "647751843213568961203" var web3 = new Web3(); web3.setProvider(new web3.providers.HttpProvider('var filter = web3.eth.filter('pending'); filter.watch(function(error, result) { if (!error) { web3.eth.getTransaction(result, function(error, data) { if (!error) $("#newTxs tr:first").after(''+data.from+''+data.to+' '+web3.fromWei(data.value,'ether').toString()+' ETH '); }); } }); //Result //checkout latest transactions below, it might take a second to load as it is waiting for incoming txs Continue reading >>

Programming Ethereum Smart Contract Transactions In Javascript

Programming Ethereum Smart Contract Transactions In Javascript

Programming Ethereum smart contract transactions in JavaScript Programming Ethereum smart contract transactions in JavaScript By Mikko Ohtamaa 11 months ago. Tagged under web3 , ethereum , javascript , dapp , geth , parity , webpack , nodejs , solidity , solc . This a tutorial blog post and web application showing how to deploy an Ethereum smart contract and transacting with this contract from a web user interface. The web application written using JavaScript, React user interface library and Bootstrap theming. The application is coded in ECMAScript 2016 and wrapped together using Webpack module bundler. For the deployment of the contract Go Ethereum JSON-RPC API is used. The production web application communicates with Ethereum blockchain using Etherscan.io API service for pushing out transactions from the web application. All private keys are held 100% on the client side and transaction is constructed in JavaScript, making the example optimal to follow if you are working with non-custodian wallets or Dapps. We use both command line Node.js tools and browser based JavaScript in this demo. View the example application source code on Github . You need to be comfortable in advanced JavaScript programming. You need to have geth (Go-Ethereum) node or any Ethereum node software running in a Ethereum Ropsten testnet. See below how to install and connect to one safely. You need to be comfortable working on a command line in UNIXy environment, though Windows works also Interact with Ethereum blockchain over both Go-Ethereum JSON-RPC connection and EtherScan.io API Interact with smart contracts from web browser JavaScript Deploy a smart contract from a command line Generate private and public key pair offline Push transactions through etherscan.io API or optional sign tranactio Continue reading >>

Ethereum Developers Apis

Ethereum Developers Apis

[Beta] The Event Log API was designed to provide an alternative to the native eth_getLogs . Below are the list of supported filter parameters: topic0, topic1, topic2, topic3 (32 Bytes per topic) topic0_1_opr (and|or between topic0 & topic1), topic1_2_opr (and|or between topic1 & topic2), topic2_3_opr (and|or between topic2 & topic3), topic0_2_opr (and|or between topic0 & topic2) * fromBlock and toBlock accepts the blocknumber (integer, NOT hex) or 'latest' (earliest & pending is NOT supported yet) * Topic Operator (opr) choices are either 'and' or 'or' and are restricted to the above choices only * fromBlock and toBlock parameters are required * Either the address and/or topic(X) parameters are required, when multiple topic(X) parameters are used the topicX_X_opr (and|or operator) is also required * For performance & security considerations, only the first 1000 results are return. So please narrow down the filter parameters Here are some examples of how this filter maybe used: Get Event Logs from block number 379224 to 'latest' Block, where log address = 0x33990122638b9132ca29c723bdf037f1a891a70c and topic[0] = 0xf63780e752c6a54a94fc52715dbc5518a3b4c3c2833d301a204226548a2a8545 Makes a call or transaction, which won't be added to the blockchain and returns the used gas, which can be used for estimating the used gas [Beta] The WebSocket API allows developers to receive Real-Time notifications about new transactions. The Websocket Demo Page can be useful for seeing how this works. The following policies apply: * To keep the socket connection alive send a {"event":"ping"} every 20 seconds * Maximum number of 30 subscriptions per client * Maximum of 10 concurrent socket connections per/IP * After connecting to the socket you have to subscribe to an event within the next 60 Continue reading >>

Javascript Api | Ethereum Builder's Guide

Javascript Api | Ethereum Builder's Guide

To make your app work with on Ethereum, you can use the web3 object provided by the web3.js library . Under the hood it communicates to a local node through RPC calls . web3.js works with AlethZero, geth and Mist, and also in an external browser if one of the former nodes are running locally. web3 contains the eth object - web3.eth (for specifically Ethereum blockchain interactions) and the shh object - web3.shh (for Whisper interaction). Over time we'll introduce other objects for each of the other web3 protocols. As this API is designed to work with a local RPC node and all its functions are by default use synchronous HTTP requests. If you want to make asynchronous request, you can pass an optional callback as the last parameter to most functions.All callbacks are using an error first callback style: web3.eth.getBlock(48, function(error, result){ if(!error) console.log(result) else console.error(error);}) You will always get a BigNumber object for balance values as JavaScript is not able to handle big numbers correctly.Look at the following examples: "101010100324325345346456456456456456456"// "101010100324325345346456456456456456456"101010100324325345346456456456456456456// 1.0101010032432535e+38 web3.js depends on the BigNumber Library and adds it automatically. var balance = new BigNumber('131242344353464564564574574567456');// or var balance = web3.eth.getBalance(someAddress);balance.plus(21).toString(10); // toString(10) converts it to a number string// "131242344353464564564574574567477" The next example wouldn't work as we have more than 20 floating points, therefore it is recommended to keep you balance always in wei and only transform it to other units when presenting to the user: var balance = new BigNumber('13124.234435346456466666457455567456');balance.pl Continue reading >>

An Ethereum Api For Android App Developers

An Ethereum Api For Android App Developers

secure and innovative Android applications An Ethereum API for Android App Developers The time we first laid eyes upon the Ethereum project we were absolutely hyped because we imagined all the possibilities the Blockchain could hold for Android app development especially in terms of a fast and secure billing alternative for in-app purchases. As we got in touch with the technology and started working on Dapps ourselves we noticed not only the lack in Android support for Ethereum applications but the few existing Ethereum wallets were either scams or cross-platform apps not optimized for Android and with centralized nodes on 3rd-party servers. You might ask yourself now: Wait... but Ethereum on Android without connecting to a 3rd-party server? With a Full Node? That would take up way too much space on the device. That is correct. While there are ways to get a Full Node running directly on an Android device , it would take Gigabytes of space even in this early stage of the Ethereum Blockchain and until light clients are a thing we need alternatives. So we thought necessity is the mother of invention and started developing our own solution: Ethereum Android. Ethereum Android as a mobile portal toEthereum As Java developers we had a number of goals in mind: our solution should be a native Android application, offer a pleasant user-experience, and offer the user a simple way to connect to an Ethereum Full Node on a personal server. We wanted to build an Ethereum toolbox for Java developers, with all the tools developers are used to work with. Ethereum Android consists of three parts: the Server Node which is based on ethereumj , the wallet app which offers the similar functionality to the Mist Browser of Ethereum, and most importantly for developers: an API to access the Eth Continue reading >>

Buying Eth Using Coinbase Api

Buying Eth Using Coinbase Api

According to documentation, I should be able to buy ETH using coinbase API (see Place buy order ). Now, looks like I am getting BTC instead. private static void placeNonCommitBuy(String paymentMethod) { if (sAccountID != null) { String url = String.format("sAccountID); try { JSONObject params = new JSONObject(); params.put("amount", "0.001"); params.put("currency", "ETH"); params.put("payment_method", paymentMethod); params.put("agree_btc_amount_varies", true); params.put("commit", false); params.put("quote", true); doPost(url, params, sJustPrint); } catch (JSONException ex) { Assert.fail(); } }} { "data": { "id": <...snip...>, "status": "created", "payment_method": { "id": <...snip...>, "resource": "payment_method", "resource_path": <...snip...> }, "transaction": null, "user_reference": <...snip...>, "created_at": "2018-01-18T01:37:15Z", "updated_at": "2018-01-18T01:37:16Z", "resource": "buy", "resource_path": <...snip...>, "fee": { "amount": "0.99", "currency": "USD" }, "amount": { "amount": "0.00008968", "currency": "BTC" }, "total": { "amount": "2.02", "currency": "USD" }, "subtotal": { "amount": "1.03", "currency": "USD" }, "committed": true, "payout_at": "2018-01-18T01:37:14Z", "instant": true, "requires_completion_step": false }} In the website, I see that I now have some BTC (about 1 USD worth of it), but not ETH. Is there a missing / undocumented params I need to use? Or a mistake in my request? Continue reading >>

Blockcypher Releases Ethereum Api Toolkit For Developers

Blockcypher Releases Ethereum Api Toolkit For Developers

BlockCypher Releases Ethereum API Toolkit for Developers Jun 8, 2016 at 22:03 UTC|UpdatedJun 9, 2016 at 14:26 UTC Blockchain app development startupBlockCypher hasexpanded its platformto include support for Ethereum, a move the companysays will see professional services firm Deloitte among its first users. BlockCypher CEO and co-founder Catheryne Nicholson says the addition of Ethereum was in response to an increased demand from more than half of thestartup'sclient base, which also counts remittance app startup Abra among those using the new toolset. Speaking with CoinDesk at the Exponential Finance Conference in New York, Nicholson estimated that more than half the company's developers have asked for an Ethereum integration. "Our bread and butter is developers. What they ask us for is what we implement. The number one ask was Ethereum, so we had to bring to life our APIs on the Ethereum blockchain." Launched in 2014 to provide app-building services for blockchain developers, the company last year raised $3m in a seed funding round from Tim Draper and Yahoo co-founder Jerry Yang's AME Cloud Ventures, among others. The beta release launched today includes APIs for hosting Ethereum accounts, tracking balances and facilitating transactions. Nicholson says the platform'sTuring-complete programming language has driven interest among the startup'scustomer base. "It's a much more robust scripting language," she said. "It's easier. It's in standard programming language user interfaces, it's not a machine language." According to Deloitte principal Eric Piscini, his team of 12 US-based blockchain specialists have been working with the startup to developtwo prototypes built on the bitcoin blockchain. What attracted Piscini to the Ethereum integration, he said, is that the blockch Continue reading >>

Augur Documentation

Augur Documentation

Please Note: These docs are currently being updated as we approach the launch of Augur. The Augur development team plans to have these docs fully updated prior to launching Augur. Please bear with us as we update this document and be advised that some of this information may be out-of-date or could change prior to launch. Thank you for your patience. Augur is a decentralized prediction market platform that runs on Ethereum . For a detailed, high-level explanation of how Augur works, please refer to the Augur whitepaper . The stable Augur application is built and hosted at . If you want to use or help test Augur, you do not need to download or install anything! Just go to and start using it. (If you want to use our cutting-edge development client, this is maintained at warning, we push changes to augur-dev.firebaseapp.com pretty rapidly, so it can be a bit buggy! We suggest simply using for a more stable experience.) Augur has its own dedicated Stack Exchange , which allows anyone to ask questions about Augur and get answers to those questions. Its a great resource to find the answers for questions you might have that arent answered directly in these documents. Additionally, you can chat with us on Discord . If youd like to join the conversation, just go to invite.augur.net and sign up. Most questions are best asked in the #dev or #general channels. If you would like to help develop Augur, youll need to build the client from source. To do this, first install Node.js , and Git . Next, clone the Augur GitHub repository by opening a terminal window and typing: $ git clone Navigate to the newly created augur folder by running: Once this has been done, Augurs dependencies will need to be installed. This can be done using npm or yarn. Both methods are detailed in the next sec Continue reading >>

Bitgo Platform V2 Reference

Bitgo Platform V2 Reference

Multi-user workflows for use in enterprise environments If you are an existing (BitGo V1) API user, please refer to the V1 Integrator Notes for quick information on integrating BitGo platform V2 digital currencies. Legacy users may also refer to the V1 Bitcoin API , which is still available today. There is no dependency for developers to integrate with V1 or read the legacy documentation in order to take advantage of Platform V2. The primary advantage of multi-signature wallets is the ability for multiple machines and people to work together to approve a given transaction.Without multiple signatures on a transaction, all credentials to approve a transaction must reside with a single person on a machine.If that person or machine is compromised by an attacker, all funds can be taken with no recourse and no ability to audit the individual that invoked the key. BitGos multi-signature wallets allow you to keep control of your Bitcoin or other cryptocurrency despite introducing the concept of a co-signer. This allows enterprises to set up and maintain roles, policies, and rules on the wallet, making digital currency usable for businesses. For more information, please read the BitGo Whitepaper . To initialize your environment and authorize, use the following code: const BitGoJS = require('bitgo');// Read the user authentication section to get your API access tokenconst bitgo = new BitGoJS.BitGo({ env: 'test', accessToken: process.env.ACCESS_TOKEN });let coin = bitgo.coin('tbtc'); The BitGo web APIs provide developers with the capability to create and manage multi-signature wallets, manipulate their policies and interact with multiple digital currencies over a single robust interface.Several sensitive operations, such as the creation of user private keys and signing of transac Continue reading >>

Implementing Ethereum Trading Front-runs On The Bancor Exchange Inpython

Implementing Ethereum Trading Front-runs On The Bancor Exchange Inpython

Implementing Ethereum trading front-runs on the Bancor exchange inPython Launching the attack: the green letters look just like onTV This post is a deep-dive into programmatically trading on the Ethereum / Bancor exchange and exploiting a game-theoretic security flaw in Bancor , a high-profile smart contract on the Ethereum blockchain. The full code can be found at . We collaborated with the Bancor team to make sure the current exploit is protected against, although for a little while there would still be a chance to make some beer money for educational purposes. Imagine trying to hack Bank of America except you can read all of their code in advance, all of their transactions are public, and if you steal the money its irreversible. Sounds like a paranoid worst-case scenario? Well, this is exactly the setup Ethereum smart contract developers have to deal with every day. Bitcoin and the blockchain technology unlocked tremendous possibilities in international payments, and the Ethereum further magnified it by allowing to manage these payments through programs called smart contracts. However, smart contracts also give hackers a much easier setup for attacks. Front-running is one such attack. The term originated in the stock market, back in the days when trades were executed on paper, carried by hand between the trading desks. A broker would receive an order from a client to buy a certain stock, but then place a buy order for themselves in front. That way the broker benefits from the price increase at the expense of their client. Naturally, the practice is unfair and was outlawed. On the blockchain, the problem becomes a lot more severe. First, all the transactions are broadcast publicly. More importantly, blockchain participants across the world are not bound by the same r Continue reading >>

Is There Any Services Which Offer Api For Ethereum Transaction ?

Is There Any Services Which Offer Api For Ethereum Transaction ?

Is there any services which offer API for ETHereum transaction ? Subject, something like this needed (- crypto exchanger Remember that Bitcoin is still beta software. Don't put all of your money into BTC! Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here. if there is any, i have not yet seen it. and i have looked for it too. you see it is always based on demand. people don't really use Ethereum payments so there isn't enough demand for such services. but with bitcoin obviously there has been and there are multiple wallet APIs for it out there. i am curious to know why you want it though? if you can share your plans here, please do. Quote from: Uniex on April 11, 2017, 12:10:52 PM Subject, something like this needed You can use the ether scan API to broadcast transactions, or you can try to find a web3 provider, or, a webhook. Blockcypher have an API for ethereum. i am curious to know why you want it though? if you can share your plans here, please do. I want to integrate ETH exchange direction for my exchanger You can use the ether scan API to broadcast transactions, or you can try to find a web3 provider, or, a webhook. Blockcypher have an API for ethereum. i am curious to know why you want it though? if you can share your plans here, please do. I want to integrate ETH exchange direction for my exchanger You can use the ether scan API to broadcast transactions, or you can try to find a web3 provider, or, a webhook. Blockcypher have an API for ethereum. I don't advise you to use these APIs for exchange matters, you should use a pruned ethereum node, you can do this either with geth or parity, here is a good article : Then just use the native web3 api, or any other. Unfortunately it Continue reading >>

Providers Api Ethers.js 3.0.0 Documentation

Providers Api Ethers.js 3.0.0 Documentation

This automatically creates a FallbackProvider backed by INFURA and Etherscan; recommended var providers = require('ethers').providers;// Connect to Ropsten (the test network)// You may specify any of:// - boolean; true = ropsten, false = homestead// - object; { name: 'ropsten', chainId: 3 } (see ethers.networks);// - string; e.g. 'homestead', 'ropsten', 'rinkeby', 'kovan'var network = providers.networks.ropsten;// Connect to INFUAvar infuraProvider = new providers.InfuraProvider(network);// Connect to Etherscanvar etherscanProvider = new providers.EtherscanProvider(network);// Creating a provider to automatically fallback onto Etherscan// if INFURA is downvar fallbackProvider = new providers.FallbackProvider([ infuraProvider, etherscanProvider]);// This is equivalent to using the getDefaultProvidervar provider = providers.getDefaultProvider(network)// Connect to a local Parity instancevar provider = new providers.JsonRpcProvider('network);// Connect to an injected Web3's provider (e.g. MetaMask)var web3Provider = new providers.Web3Provider(web3.currentProvider, network); All properties are immutable, and reflect their default value if not specified, or ifindirectly populated by child Objects. These are relatively low-level calls. The Contracts API shouldusually be used instead. Send the read-only (constant) transaction to a single Ethereum node andreturn a Promise with the result (as a hex string ) of executing it.(See Transaction Requests ) This is free, since it does not change any state on the blockchain. Send a transaction to a single Ethereum node and return a Promise with theestimated amount of gas required (as a BigNumber ) to send it.(See Transaction Requests ) This is free, but only an estimate. Providing too little gas will result in atransaction being reject Continue reading >>

Ethereumjs By Ethereumjs

Ethereumjs By Ethereumjs

browser-builds : browser builds of ethereumjs libraries common : the genesis data for the blockchain ethereumjs-abi : ABI encoding and decoding ethereumjs-account : account schema encoding, decoding and validation ethereumjs-block : block schema encoding, decoding and validation ethereumjs-blockchain : manage a blockchain ethereumjs-codesim : run EVM or Solidity code and examine the output ethereumjs-icap : utilities for handling ICAP (Ethereum in IBAN) encoding ethereumjs-lib : meta package for loading the other ethereumjs- modules ethereumjs-testing : transforms the official test vectors to a format suitable for ethereumjs ethereumjs-tx : transaction creation, manipulation, signing and verification ethereumjs-units : Ethereum unit conversion ethereumjs-util : a collection of frequently used methods by the other libraries ethereumjs-wallet : lightweight toolkit for managing Ethereum keys, including HD wallet support ethereumjs-vm : a complete EVM (Ethereum Virtual Machine) and state processing implementation geth.js : start and stop geth from Node.js helpeth : purists' commandline tool for key and transaction management keythereum : create, import and export Ethereum keys merkle-patricia-tree : This is an implementation of the modified merkle patricia tree as specified in the Ethereum yellow paper node-blockchain-server : aims to provide a full Ethereum node implementation node-devp2p : implementation of the RLPx transport protocol for Ethereum (used between nodes) node-devp2p-dpt : implementation of the RLPx DPT (peer table) protocol for Ethereum node-devp2p-eth : implementation of the Ethereum sub-protocol over RLPx node-devp2p-manager : peer manager for DPT & RLPx Continue reading >>

Javascript Api Ethereum/wiki Wiki Github

Javascript Api Ethereum/wiki Wiki Github

First you need to get web3.js into your project. This can be done using the following methods: Then you need to create a web3 instance, setting a provider.To make sure you don't overwrite the already set provider when in mist, check first if the web3 is available: if (typeof web3 !== 'undefined') { web3 = new Web3(web3.currentProvider);} else { // set the provider you want from Web3.providers web3 = new Web3(new Web3.providers.HttpProvider("After that you can use the API of the web3 object. As this API is designed to work with a local RPC node, all its functions use synchronous HTTP requests by default. If you want to make an asynchronous request, you can pass an optional callback as the last parameter to most functions.All callbacks are using an error first callback style: web3.eth.getBlock(48, function(error, result){ if(!error) console.log(result) else console.error(error);}) Batch requests allow queuing up requests and processing them at once. Note Batch requests are not faster! In fact making many requests at once will in some cases be faster, as requests are processed asynchronously. Batch requests are mainly useful to ensure the serial processing of requests. var batch = web3.createBatch();batch.add(web3.eth.getBalance.request('0x0000000000000000000000000000000000000000', 'latest', callback));batch.add(web3.eth.contract(abi).at(address).balance.request(address, callback2));batch.execute(); You will always get a BigNumber object for number values as JavaScript is not able to handle big numbers correctly.Look at the following examples: "101010100324325345346456456456456456456"// "101010100324325345346456456456456456456"101010100324325345346456456456456456456// 1.0101010032432535e+38 web3.js depends on the BigNumber Library and adds it automatically. var balance = Continue reading >>

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