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Author: Fedor Katurov <gotham48@gmail.com>
Date: Thu Nov 10 14:12:45 2022 +0600
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<head><title>Smart Contracts • Obsidian Garden</title><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1"><meta name="description" content="For common functions see Common typescript examples."><meta name="head:count" content="3"><link rel="modulepreload" href="/blockchain/smart-contracts/_payload.js"><link rel="modulepreload" as="script" crossorigin href="/nuxt/entry.14299f65.js"><link rel="modulepreload" as="script" crossorigin href="/nuxt/default.f3afdec5.js"><link rel="modulepreload" as="script" crossorigin href="/nuxt/LayoutMainMenuToggle.943df544.js"><link rel="modulepreload" as="script" crossorigin href="/nuxt/LayoutMainMenuToggle.vue_used_vue_type_style_index_0_lang.module.ab60ac3f.js"><link rel="preload" as="style" href="/nuxt/LayoutMainMenuToggle.vue_used_vue_type_style_index_0_lang.5944fda9.css"><link rel="modulepreload" as="script" crossorigin href="/nuxt/LayoutMainMenu.b2438cb1.js"><link rel="modulepreload" as="script" crossorigin 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_theme_toggle_1km9a_23"><span></span></button><!--[--><!--[--><main><!--[--><h1>Smart Contracts</h1><article><div><p><!--[-->For common functions see <a href="/blockchain/common-typescript-examples" class=""><!--[-->Common typescript examples<!--]--></a>.<!--]--></p><h2 id="getting-smart-contract-instance"><a href="#getting-smart-contract-instance"><!--[-->Getting smart contract instance<!--]--></a></h2><p><!--[-->Useful for calling smart contract methods:<!--]--></p><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>typescript</span></button><!--[--><pre><code><span class="line"><span class="ct-a7723a">import</span><span class="ct-64b086"> { </span><span class="ct-41892f">Contract</span><span class="ct-64b086"> } </span><span class="ct-a7723a">from</span><span class="ct-64b086"> </span><span class="ct-962005">'web3-eth-contract'</span><span class="ct-64b086">;</span></span><span class="line"><span class="ct-a7723a">import</span><span class="ct-64b086"> { </span><span class="ct-41892f">web3</span><span class="ct-64b086"> } </span><span class="ct-a7723a">from</span><span class="ct-64b086"> </span><span class="ct-962005">'.'</span><span class="ct-64b086">;</span></span><span class="line"></span><span class="line"><span class="ct-76a269">const</span><span class="ct-445399"> </span><span class="ct-adbdaf">getContract</span><span class="ct-445399"> </span><span class="ct-97fc9e">=</span><span class="ct-445399"> (</span><span class="ct-492994">abi</span><span class="ct-97fc9e">:</span><span class="ct-445399"> </span><span class="ct-5b176b">object</span><span class="ct-445399">, </span><span class="ct-492994">address</span><span class="ct-97fc9e">?:</span><span class="ct-445399"> </span><span class="ct-5b176b">string</span><span class="ct-445399">)</span><span class="ct-97fc9e">:</span><span class="ct-445399"> </span><span class="ct-76a269">=></span><span class="ct-445399"> {</span></span><span class="line"><span class="ct-445399"> </span><span class="ct-76a269">const</span><span class="ct-445399"> </span><span class="ct-69cd54">abiFromJson</span><span class="ct-445399"> </span><span class="ct-97fc9e">=</span><span class="ct-445399"> </span><span class="ct-650e82">JSON</span><span class="ct-445399">.</span><span class="ct-69cd54">parse</span><span class="ct-445399">(</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-a7723a">return</span><span class="ct-64b086"> </span><span class="ct-a7723a">new</span><span class="ct-64b086"> </span><span class="ct-41892f">web3</span><span class="ct-64b086">.</span><span class="ct-41892f">eth</span><span class="ct-64b086">.</span><span class="ct-312f4e">Contract</span><span class="ct-64b086">(</span><span class="ct-41892f">abiFromJson</span><span class="ct-64b086">, </span><span class="ct-41892f">address</span><span class="ct-64b086">);</span></span><span class="line"><span class="ct-64b086">};</span></span><span class="line"></span><span class="line"><span class="ct-a7723a">export</span><span class="ct-f12b07"> </span><span class="ct-a7723a">default</span><span class="ct-f12b07"> </span><span class="ct-41892f">getContract</span><span class="ct-64b086">;</span></span></code></pre><!--]--></div><h2 id="executing-contract-method"><a href="#executing-contract-method"><!--[-->Executing contract method<!--]--></a></h2><p><!--[-->Contract has <strong><!--[-->read<!--]--></strong> and <strong><!--[-->write<!--]--></strong> methods. To get a list of methods, you can paste contract address on <a href="https://etherscan.io/token/0xdac17f958d2ee523a2206206994597c13d831ec7#readContract" rel="nofollow" target="_blank"><!--[-->https://etherscan.io/ ETH<!--]--></a> or any other service.<!--]--></p><p><!--[--><strong><!--[-->Read<!--]--></strong> methods doesn't require spending <strong><!--[-->gas<!--]--></strong>. <strong><!--[-->Write<!--]--></strong> methods cost some amount of <strong><!--[-->gas<!--]--></strong>, hence they will be executed with confirmation from user.<!--]--></p><h3 id="example-for-metamask-without-private-key"><a href="#example-for-metamask-without-private-key"><!--[-->Example for #Metamask without private key<!--]--></a></h3><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>typescript</span></button><!--[--><pre><code><span class="line"><span class="ct-2dcbf5">// see example below</span></span><span class="line"><span class="ct-a7723a">import</span><span class="ct-64b086"> { </span><span class="ct-41892f">getContract</span><span class="ct-64b086"> } </span><span class="ct-a7723a">from</span><span class="ct-64b086"> </span><span class="ct-962005">'.'</span><span class="ct-64b086">;</span></span><span class="line"></span><span class="line"><span class="ct-2dcbf5">// ABI of contract</span></span><span class="line"><span class="ct-09b465">const</span><span class="ct-64b086"> </span><span class="ct-01dfb8">CONTRACT_ABI</span><span class="ct-64b086"> </span><span class="ct-a7723a">=</span><span class="ct-64b086"> { </span><span class="ct-2dcbf5">/* ... */</span><span class="ct-64b086"> };</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-2dcbf5">// address for contract</span></span><span class="line"><span class="ct-09b465">const</span><span class="ct-64b086"> </span><span class="ct-01dfb8">CONTRACT_ADDRESS</span><span class="ct-64b086"> </span><span class="ct-a7723a">=</span><span class="ct-64b086"> </span><span class="ct-962005">'0xdea164f67df4dbfe675d5271c9d404e0260f33bb'</span><span class="ct-64b086">;</span></span><span class="line"></span><span class="line"><span class="ct-a7723a">export</span><span class="ct-64b086"> </span><span class="ct-09b465">const</span><span class="ct-64b086"> </span><span class="ct-312f4e">executeContractMethod</span><span class="ct-64b086"> </span><span class="ct-a7723a">=</span><span class="ct-64b086"> </span><span class="ct-09b465">async</span><span class="ct-64b086"> ({}) </span><span class="ct-09b465">=></span><span class="ct-64b086"> {</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-2dcbf5">// getting contract</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-09b465">const</span><span class="ct-64b086"> </span><span class="ct-01dfb8">contract</span><span class="ct-64b086"> </span><span class="ct-a7723a">=</span><span class="ct-64b086"> </span><span class="ct-312f4e">getContract</span><span class="ct-64b086">(</span><span class="ct-01dfb8">CONTRACT_ABI</span><span class="ct-64b086">, </span><span class="ct-01dfb8">CONTRACT_ADDRESS</span><span class="ct-64b086">);</span></span><span class="line"><span class="ct-64b086"> </span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-2dcbf5">// Calling write method</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-a7723a">try</span><span class="ct-64b086"> {</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-2dcbf5">// authorizing with Metamask</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-a7723a">await</span><span class="ct-64b086"> </span><span class="ct-41892f">web3</span><span class="ct-64b086">.</span><span class="ct-41892f">currentProvider</span><span class="ct-64b086">.</span><span class="ct-312f4e">request</span><span class="ct-64b086">({ method: </span><span class="ct-962005">'eth_requestAccounts'</span><span class="ct-64b086"> });</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-2dcbf5">// getting wallet address</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-09b465">const</span><span class="ct-64b086"> </span><span class="ct-01dfb8">addressUser</span><span class="ct-64b086"> </span><span class="ct-a7723a">=</span><span class="ct-64b086"> </span><span class="ct-41892f">web3</span><span class="ct-64b086">.</span><span class="ct-41892f">currentProvider</span><span class="ct-64b086">.</span><span class="ct-41892f">selectedAddress</span><span class="ct-64b086">;</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-2dcbf5">// calling "store" store method for contract</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-2dcbf5">// payload should include `from` address, that matches</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-2dcbf5">// current user's wallet</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-a7723a">await</span><span class="ct-64b086"> </span><span class="ct-41892f">contract</span><span class="ct-64b086">.</span><span class="ct-41892f">methods</span><span class="ct-64b086">.</span><span class="ct-312f4e">store</span><span class="ct-64b086">(</span><span class="ct-4b5458">0</span><span class="ct-64b086">, </span><span class="ct-962005">'Parameter'</span><span class="ct-64b086">).</span><span class="ct-312f4e">send</span><span class="ct-64b086">({</span></span><span class="line"><span class="ct-64b086"> from: </span><span class="ct-41892f">addressUser</span><span class="ct-64b086">,</span></span><span class="line"><span class="ct-64b086"> });</span></span><span class="line"><span class="ct-64b086"> } </span><span class="ct-a7723a">catch</span><span class="ct-64b086"> (</span><span class="ct-41892f">e</span><span class="ct-64b086">) {</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-a7723a">throw</span><span class="ct-64b086"> </span><span class="ct-a7723a">new</span><span class="ct-64b086"> </span><span class="ct-ed3166">Error</span><span class="ct-64b086">(</span><span class="ct-41892f">e</span><span class="ct-64b086">);</span></span><span class="line"><span class="ct-64b086"> }</span></span><span class="line"><span class="ct-64b086"> </span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-2dcbf5">// calling read method</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-a7723a">try</span><span class="ct-64b086"> {</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-2dcbf5">// this method can return data</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-09b465">const</span><span class="ct-64b086"> </span><span class="ct-01dfb8">result</span><span class="ct-64b086"> </span><span class="ct-a7723a">=</span><span class="ct-64b086"> </span><span class="ct-a7723a">await</span><span class="ct-64b086"> </span><span class="ct-41892f">contract</span><span class="ct-64b086">.</span><span class="ct-41892f">methods</span><span class="ct-64b086">.</span><span class="ct-312f4e">retrieve</span><span class="ct-64b086">().</span><span class="ct-312f4e">call</span><span class="ct-64b086">();</span></span><span class="line"><span class="ct-64b086"> } </span><span class="ct-a7723a">catch</span><span class="ct-64b086"> (</span><span class="ct-41892f">e</span><span class="ct-64b086">) {</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-a7723a">throw</span><span class="ct-64b086"> </span><span class="ct-a7723a">new</span><span class="ct-64b086"> </span><span class="ct-ed3166">Error</span><span class="ct-64b086">(</span><span class="ct-41892f">e</span><span class="ct-64b086">);</span></span><span class="line"><span class="ct-64b086"> }</span></span><span class="line"><span class="ct-64b086">}</span></span></code></pre><!--]--></div><h3 id="nodejs-and-react-native-example"><a href="#nodejs-and-react-native-example"><!--[-->Node.js and React Native example<!--]--></a></h3><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>typescript</span></button><!--[--><pre><code><span class="line"><span class="ct-2dcbf5">// see example below</span></span><span class="line"><span class="ct-a7723a">import</span><span class="ct-64b086"> { </span><span class="ct-41892f">getContract</span><span class="ct-64b086"> } </span><span class="ct-a7723a">from</span><span class="ct-64b086"> </span><span class="ct-962005">'.'</span><span class="ct-64b086">;</span></span><span class="line"></span><span class="line"><span class="ct-2dcbf5">// ABI контракта</span></span><span class="line"><span class="ct-09b465">const</span><span class="ct-64b086"> </span><span class="ct-01dfb8">CONTRACT_ABI</span><span class="ct-64b086"> </span><span class="ct-a7723a">=</span><span class="ct-64b086"> { </span><span class="ct-2dcbf5">/* ... */</span><span class="ct-64b086"> };</span></span><span class="line"><span class="ct-2dcbf5">// contract address</span></span><span class="line"><span class="ct-09b465">const</span><span class="ct-64b086"> </span><span class="ct-01dfb8">CONTRACT_ADDRESS</span><span class="ct-64b086"> </span><span class="ct-a7723a">=</span><span class="ct-64b086"> </span><span class="ct-962005">'0xdea164f67df4dbfe675d5271c9d404e0260f33bb'</span><span class="ct-64b086">;</span></span><span class="line"><span class="ct-2dcbf5">// getting contract</span></span><span class="line"><span class="ct-09b465">const</span><span class="ct-64b086"> </span><span class="ct-01dfb8">contract</span><span class="ct-64b086"> </span><span class="ct-a7723a">=</span><span class="ct-64b086"> </span><span class="ct-312f4e">getContract</span><span class="ct-64b086">(</span><span class="ct-01dfb8">CONTRACT_ABI</span><span class="ct-64b086">, </span><span class="ct-01dfb8">CONTRACT_ADDRESS</span><span class="ct-64b086">);</span></span><span class="line"><span class="ct-2dcbf5">// account's private key</span></span><span class="line"><span class="ct-09b465">const</span><span class="ct-64b086"> </span><span class="ct-01dfb8">privateKey</span><span class="ct-64b086"> </span><span class="ct-a7723a">=</span><span class="ct-64b086"> </span><span class="ct-962005">'...'</span><span class="ct-64b086">;</span></span><span class="line"></span><span class="line"><span class="ct-2dcbf5">// write-methods requires private key</span></span><span class="line"><span class="ct-76a269">const</span><span class="ct-445399"> </span><span class="ct-adbdaf">executeContractMethod</span><span class="ct-445399"> </span><span class="ct-97fc9e">=</span><span class="ct-445399"> </span><span class="ct-76a269">async</span><span class="ct-445399"> (</span><span class="ct-492994">val</span><span class="ct-97fc9e">:</span><span class="ct-445399"> </span><span class="ct-5b176b">number</span><span class="ct-445399">) </span><span class="ct-76a269">=></span><span class="ct-445399"> {</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-09b465">const</span><span class="ct-64b086"> </span><span class="ct-01dfb8">transaction</span><span class="ct-64b086"> </span><span class="ct-a7723a">=</span><span class="ct-64b086"> </span><span class="ct-41892f">contract</span><span class="ct-64b086">.</span><span class="ct-41892f">methods</span><span class="ct-64b086">.</span><span class="ct-312f4e">store</span><span class="ct-64b086">(</span><span class="ct-41892f">val</span><span class="ct-64b086">);</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-09b465">const</span><span class="ct-64b086"> </span><span class="ct-01dfb8">account</span><span class="ct-64b086"> </span><span class="ct-a7723a">=</span><span class="ct-64b086"> </span><span class="ct-41892f">web3</span><span class="ct-64b086">.</span><span class="ct-41892f">eth</span><span class="ct-64b086">.</span><span class="ct-41892f">accounts</span><span class="ct-64b086">.</span><span class="ct-312f4e">privateKeyToAccount</span><span class="ct-64b086">(</span><span class="ct-41892f">privateKey</span><span class="ct-64b086">);</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-09b465">const</span><span class="ct-64b086"> </span><span class="ct-01dfb8">options</span><span class="ct-64b086"> </span><span class="ct-a7723a">=</span><span class="ct-64b086"> {</span></span><span class="line"><span class="ct-64b086"> to: </span><span class="ct-01dfb8">CONTRACT_ADDRESS</span><span class="ct-64b086">,</span></span><span class="line"><span class="ct-64b086"> data: </span><span class="ct-41892f">transaction</span><span class="ct-64b086">.</span><span class="ct-312f4e">encodeABI</span><span class="ct-64b086">(),</span></span><span class="line"><span class="ct-64b086"> gas: </span><span class="ct-a7723a">await</span><span class="ct-64b086"> </span><span class="ct-41892f">transaction</span><span class="ct-64b086">.</span><span class="ct-312f4e">estimateGas</span><span class="ct-64b086">({ from: </span><span class="ct-41892f">account</span><span class="ct-64b086">.</span><span class="ct-41892f">address</span><span class="ct-64b086"> }),</span></span><span class="line"><span class="ct-64b086"> gasPrice: </span><span class="ct-a7723a">await</span><span class="ct-64b086"> </span><span class="ct-41892f">web3</span><span class="ct-64b086">.</span><span class="ct-41892f">eth</span><span class="ct-64b086">.</span><span class="ct-312f4e">getGasPrice</span><span class="ct-64b086">(),</span></span><span class="line"><span class="ct-64b086"> };</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-09b465">const</span><span class="ct-64b086"> </span><span class="ct-01dfb8">signed</span><span class="ct-64b086"> </span><span class="ct-a7723a">=</span><span class="ct-64b086"> </span><span class="ct-a7723a">await</span><span class="ct-64b086"> </span><span class="ct-41892f">web3</span><span class="ct-64b086">.</span><span class="ct-41892f">eth</span><span class="ct-64b086">.</span><span class="ct-41892f">accounts</span><span class="ct-64b086">.</span><span class="ct-312f4e">signTransaction</span><span class="ct-64b086">(</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-41892f">options</span><span class="ct-64b086">,</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-41892f">privateKey</span><span class="ct-64b086">,</span></span><span class="line"><span class="ct-64b086"> );</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-a7723a">await</span><span class="ct-64b086"> </span><span class="ct-41892f">web3</span><span class="ct-64b086">.</span><span class="ct-41892f">eth</span><span class="ct-64b086">.</span><span class="ct-312f4e">sendSignedTransaction</span><span class="ct-64b086">(</span><span class="ct-41892f">signed</span><span class="ct-64b086">.</span><span class="ct-41892f">rawTransaction</span><span class="ct-a7723a">!</span><span class="ct-64b086">);</span></span><span class="line"><span class="ct-64b086">};</span></span></code></pre><!--]--></div><h3 id="calling-a-batch-of-contracts-methods"><a href="#calling-a-batch-of-contracts-methods"><!--[-->Calling a batch of contract's methods<!--]--></a></h3><p><!--[-->Function calls batch of requests, returning array of results. For example:<!--]--></p><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>typescript</span></button><!--[--><pre><code><span class="line"><span class="ct-64b086"> </span><span class="ct-09b465">const</span><span class="ct-64b086"> </span><span class="ct-01dfb8">requests</span><span class="ct-64b086"> </span><span class="ct-a7723a">=</span><span class="ct-64b086"> [</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-41892f">contract</span><span class="ct-64b086">.</span><span class="ct-41892f">method</span><span class="ct-64b086">.</span><span class="ct-312f4e">balanceOf</span><span class="ct-64b086">().</span><span class="ct-41892f">call</span><span class="ct-64b086">,</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-41892f">contract</span><span class="ct-64b086">.</span><span class="ct-41892f">method</span><span class="ct-64b086">.</span><span class="ct-312f4e">getStaked</span><span class="ct-64b086">().</span><span class="ct-41892f">call</span></span><span class="line"><span class="ct-64b086"> ]</span></span><span class="line"></span><span class="line"><span class="ct-64b086"> </span><span class="ct-09b465">const</span><span class="ct-64b086"> </span><span class="ct-01dfb8">result</span><span class="ct-64b086"> </span><span class="ct-a7723a">=</span><span class="ct-64b086"> </span><span class="ct-a7723a">await</span><span class="ct-64b086"> </span><span class="ct-312f4e">makeBatchRequest</span><span class="ct-64b086">(</span><span class="ct-41892f">request</span><span class="ct-64b086">);</span></span></code></pre><!--]--></div><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>typescript</span></button><!--[--><pre><code><span class="line"><span class="ct-09b465">const</span><span class="ct-64b086"> </span><span class="ct-01dfb8">web3</span><span class="ct-64b086"> </span><span class="ct-a7723a">=</span><span class="ct-64b086"> </span><span class="ct-a7723a">new</span><span class="ct-64b086"> </span><span class="ct-312f4e">Web3</span><span class="ct-64b086">(</span><span class="ct-41892f">Web3</span><span class="ct-64b086">.</span><span class="ct-41892f">givenProvider</span><span class="ct-64b086"> </span><span class="ct-a7723a">||</span><span class="ct-64b086"> </span><span class="ct-01dfb8">PROVIDER_URL</span><span class="ct-64b086">);</span></span><span class="line"></span><span class="line"><span class="ct-76a269">const</span><span class="ct-445399"> </span><span class="ct-adbdaf">makeBatchRequest</span><span class="ct-445399"> </span><span class="ct-97fc9e">=</span><span class="ct-445399"> (</span><span class="ct-492994">calls</span><span class="ct-97fc9e">:</span><span class="ct-445399"> </span><span class="ct-5b176b">any</span><span class="ct-445399">[]) </span><span class="ct-76a269">=></span><span class="ct-445399"> {</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-a7723a">try</span><span class="ct-64b086"> {</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-09b465">const</span><span class="ct-64b086"> </span><span class="ct-01dfb8">web3</span><span class="ct-64b086"> </span><span class="ct-a7723a">=</span><span class="ct-64b086"> </span><span class="ct-312f4e">getWeb3NoAccount</span><span class="ct-64b086">();</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-09b465">const</span><span class="ct-64b086"> </span><span class="ct-01dfb8">batch</span><span class="ct-64b086"> </span><span class="ct-a7723a">=</span><span class="ct-64b086"> </span><span class="ct-a7723a">new</span><span class="ct-64b086"> </span><span class="ct-41892f">web3</span><span class="ct-64b086">.</span><span class="ct-312f4e">BatchRequest</span><span class="ct-64b086">();</span></span><span class="line"></span><span class="line"><span class="ct-64b086"> </span><span class="ct-09b465">const</span><span class="ct-64b086"> </span><span class="ct-01dfb8">promises</span><span class="ct-64b086"> </span><span class="ct-a7723a">=</span><span class="ct-64b086"> </span><span class="ct-41892f">calls</span><span class="ct-64b086">.</span><span class="ct-312f4e">map</span><span class="ct-09b465">=></span><span class="ct-64b086"> {</span></span><span class="line"><span class="ct-445399"> </span><span class="ct-97fc9e">return</span><span class="ct-445399"> </span><span class="ct-97fc9e">new</span><span class="ct-445399"> </span><span class="ct-5b176b">Promise</span><span class="ct-445399">((</span><span class="ct-492994">resolve</span><span class="ct-445399">, </span><span class="ct-492994">reject</span><span class="ct-445399">) </span><span class="ct-76a269">=></span><span class="ct-445399"> {</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-41892f">batch</span><span class="ct-64b086">.</span><span class="ct-312f4e">add</span><span class="ct-64b086">(</span></span><span class="line"></span><span class="line"><span class="ct-64b086"> </span><span class="ct-a7723a">if</span><span class="ct-64b086"> (</span><span class="ct-41892f">err</span><span class="ct-64b086">) {</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-312f4e">reject</span><span class="ct-64b086">(</span><span class="ct-41892f">err</span><span class="ct-64b086">);</span></span><span class="line"><span class="ct-64b086"> } </span><span class="ct-a7723a">else</span><span class="ct-64b086"> {</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-312f4e">resolve</span><span class="ct-64b086">(</span><span class="ct-41892f">result</span><span class="ct-64b086">);</span></span><span class="line"><span class="ct-64b086"> }</span></span><span class="line"><span class="ct-64b086"> })</span></span><span class="line"><span class="ct-64b086"> );</span></span><span class="line"><span class="ct-64b086"> });</span></span><span class="line"><span class="ct-64b086"> });</span></span><span class="line"></span><span class="line"><span class="ct-64b086"> </span><span class="ct-41892f">batch</span><span class="ct-64b086">.</span><span class="ct-312f4e">execute</span><span class="ct-64b086">();</span></span><span class="line"></span><span class="line"><span class="ct-64b086"> </span><span class="ct-a7723a">return</span><span class="ct-64b086"> </span><span class="ct-ed3166">Promise</span><span class="ct-64b086">.</span><span class="ct-312f4e">all</span><span class="ct-64b086">(</span><span class="ct-41892f">promises</span><span class="ct-64b086">);</span></span><span class="line"><span class="ct-64b086"> } </span><span class="ct-a7723a">catch</span><span class="ct-64b086"> {</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-a7723a">return</span><span class="ct-64b086"> </span><span class="ct-b75af6">null</span><span class="ct-64b086">;</span></span><span class="line"><span class="ct-64b086"> }</span></span><span class="line"><span class="ct-64b086">};</span></span><span class="line"></span><span class="line"><span class="ct-a7723a">export</span><span class="ct-f12b07"> </span><span class="ct-a7723a">default</span><span class="ct-f12b07"> </span><span class="ct-41892f">makeBatchRequest</span><span class="ct-64b086">;</span></span></code></pre><!--]--></div><h2 id="subscribing-to-smart-contract-events"><a href="#subscribing-to-smart-contract-events"><!--[-->Subscribing to smart contract events<!--]--></a></h2><p><!--[-->There're different ways to subscribe for contract events. For all of them you will need following variables:<!--]--></p><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>typescript</span></button><!--[--><pre><code><span class="line"><span class="ct-64b086"> </span><span class="ct-a7723a">import</span><span class="ct-64b086"> </span><span class="ct-41892f">Web3</span><span class="ct-64b086"> </span><span class="ct-a7723a">from</span><span class="ct-64b086"> </span><span class="ct-962005">'web3'</span><span class="ct-64b086">;</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-09b465">const</span><span class="ct-64b086"> </span><span class="ct-01dfb8">web3</span><span class="ct-64b086"> </span><span class="ct-a7723a">=</span><span class="ct-64b086"> </span><span class="ct-a7723a">new</span><span class="ct-64b086"> </span><span class="ct-312f4e">Web3</span><span class="ct-64b086">(</span><span class="ct-962005">'YOUR_RPC_ENDPOINT_HERE'</span><span class="ct-64b086">);</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-09b465">const</span><span class="ct-64b086"> </span><span class="ct-01dfb8">ABI</span><span class="ct-64b086"> </span><span class="ct-a7723a">=</span><span class="ct-64b086"> </span><span class="ct-962005">'YOUR ABI HERE'</span><span class="ct-64b086">;</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-09b465">const</span><span class="ct-64b086"> </span><span class="ct-01dfb8">CONTRACT_ADDRESS</span><span class="ct-64b086"> </span><span class="ct-a7723a">=</span><span class="ct-64b086"> </span><span class="ct-962005">'YOUR CONTRACT ADDRESS HERE'</span><span class="ct-64b086">;</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-09b465">const</span><span class="ct-64b086"> </span><span class="ct-01dfb8">myContract</span><span class="ct-64b086"> </span><span class="ct-a7723a">=</span><span class="ct-64b086"> </span><span class="ct-a7723a">new</span><span class="ct-64b086"> </span><span class="ct-41892f">Web3</span><span class="ct-64b086">.</span><span class="ct-312f4e">Contract</span><span class="ct-64b086">(</span><span class="ct-01dfb8">ABI</span><span class="ct-64b086">, </span><span class="ct-01dfb8">CONTRACT_ADDRESS</span><span class="ct-64b086">);</span></span></code></pre><!--]--></div><h3 id="by-accessing-contractevents"><a href="#by-accessing-contractevents"><!--[-->By accessing contract.events<!--]--></a></h3><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>typescript</span></button><!--[--><pre><code><span class="line"><span class="ct-41892f">referralProgramContract</span><span class="ct-64b086">.</span><span class="ct-41892f">events</span></span><span class="line"><span class="ct-64b086"> .</span><span class="ct-312f4e">RegisterUser</span><span class="ct-64b086">()</span></span><span class="line"><span class="ct-445399"> .</span><span class="ct-adbdaf">on</span><span class="ct-445399">(</span><span class="ct-a93773">'connected'</span><span class="ct-445399">, (</span><span class="ct-492994">subscriptionId</span><span class="ct-97fc9e">:</span><span class="ct-445399"> </span><span class="ct-5b176b">string</span><span class="ct-445399">) </span><span class="ct-76a269">=></span><span class="ct-445399"> {</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-41892f">console</span><span class="ct-64b086">.</span><span class="ct-312f4e">log</span><span class="ct-64b086">(</span><span class="ct-962005">`| UserRegistered | events | ${</span><span class="ct-41892f">subscriptionId</span><span class="ct-962005">}`</span><span class="ct-64b086">);</span></span><span class="line"><span class="ct-64b086"> })</span></span><span class="line"><span class="ct-64b086"> .</span><span class="ct-312f4e">on</span><span class="ct-64b086">(</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-962005">'data'</span><span class="ct-64b086">,</span></span><span class="line"><span class="ct-445399"> </span><span class="ct-76a269">async</span><span class="ct-445399"> (</span><span class="ct-492994">event</span><span class="ct-97fc9e">:</span><span class="ct-445399"> {</span></span><span class="line"><span class="ct-445399"> </span><span class="ct-492994">removed</span><span class="ct-97fc9e">:</span><span class="ct-445399"> </span><span class="ct-5b176b">boolean</span><span class="ct-445399">;</span></span><span class="line"><span class="ct-445399"> </span><span class="ct-492994">returnValues</span><span class="ct-97fc9e">:</span><span class="ct-445399"> </span><span class="ct-34fa3c">RegisterUserResponseInterface</span><span class="ct-445399">;</span></span><span class="line"><span class="ct-64b086"> }) </span><span class="ct-09b465">=></span><span class="ct-64b086"> {</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-a7723a">try</span><span class="ct-64b086"> {</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-a7723a">if</span><span class="ct-64b086"> (</span><span class="ct-41892f">event</span><span class="ct-64b086">.</span><span class="ct-41892f">removed</span><span class="ct-64b086">) {</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-a7723a">return</span><span class="ct-64b086">;</span></span><span class="line"><span class="ct-64b086"> }</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-09b465">const</span><span class="ct-64b086"> { </span><span class="ct-01dfb8">user</span><span class="ct-64b086">, </span><span class="ct-01dfb8">referrer</span><span class="ct-64b086"> } </span><span class="ct-a7723a">=</span><span class="ct-64b086"> </span><span class="ct-41892f">event</span><span class="ct-64b086">.</span><span class="ct-41892f">returnValues</span><span class="ct-64b086">;</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-41892f">console</span><span class="ct-64b086">.</span><span class="ct-312f4e">log</span><span class="ct-64b086">(</span><span class="ct-41892f">user</span><span class="ct-64b086">, </span><span class="ct-41892f">referrer</span><span class="ct-64b086">);</span></span><span class="line"><span class="ct-64b086"> } </span><span class="ct-a7723a">catch</span><span class="ct-64b086"> (</span><span class="ct-41892f">e</span><span class="ct-64b086">) {</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-41892f">console</span><span class="ct-64b086">.</span><span class="ct-312f4e">log</span><span class="ct-64b086">(</span><span class="ct-962005">`| ONCE | ${</span><span class="ct-41892f">e</span><span class="ct-962005">}`</span><span class="ct-64b086">);</span></span><span class="line"><span class="ct-64b086"> }</span></span><span class="line"><span class="ct-64b086"> },</span></span><span class="line"><span class="ct-64b086"> )</span></span><span class="line"><span class="ct-445399"> .</span><span class="ct-adbdaf">on</span><span class="ct-445399">(</span><span class="ct-a93773">'error'</span><span class="ct-445399">, (</span><span class="ct-492994">error</span><span class="ct-97fc9e">:</span><span class="ct-445399"> </span><span class="ct-34fa3c">ErrnoException</span><span class="ct-445399">) </span><span class="ct-76a269">=></span><span class="ct-445399"> {</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-41892f">console</span><span class="ct-64b086">.</span><span class="ct-312f4e">log</span><span class="ct-64b086">(</span><span class="ct-41892f">error</span><span class="ct-64b086">);</span></span><span class="line"><span class="ct-64b086"> });</span></span></code></pre><!--]--></div><h3 id="with-filtering"><a href="#with-filtering"><!--[-->With filtering<!--]--></a></h3><p><!--[-->We're listening to <code><!--[-->Transfer<!--]--></code> event here:<!--]--></p><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>typescript</span></button><!--[--><pre><code><span class="line"><span class="ct-64b086"> </span><span class="ct-09b465">let</span><span class="ct-64b086"> </span><span class="ct-41892f">options</span><span class="ct-64b086"> </span><span class="ct-a7723a">=</span><span class="ct-64b086"> {</span></span><span class="line"><span class="ct-64b086"> filter: {</span></span><span class="line"><span class="ct-64b086"> value: [],</span></span><span class="line"><span class="ct-64b086"> },</span></span><span class="line"><span class="ct-64b086"> fromBlock: </span><span class="ct-4b5458">0</span></span><span class="line"><span class="ct-64b086"> };</span></span><span class="line"></span><span class="line"><span class="ct-64b086"> </span><span class="ct-41892f">myContract</span><span class="ct-64b086">.</span><span class="ct-41892f">events</span><span class="ct-64b086">.</span><span class="ct-312f4e">Transfer</span><span class="ct-64b086">(</span><span class="ct-41892f">options</span><span class="ct-64b086">)</span></span><span class="line"><span class="ct-64b086"> .</span><span class="ct-312f4e">on</span><span class="ct-64b086">(</span><span class="ct-962005">'data'</span><span class="ct-64b086"> </span><span class="ct-312f4e">log</span><span class="ct-64b086">(</span><span class="ct-41892f">event</span><span class="ct-64b086">))</span></span><span class="line"><span class="ct-64b086"> .</span><span class="ct-312f4e">on</span><span class="ct-64b086">(</span><span class="ct-962005">'changed'</span><span class="ct-64b086"> </span><span class="ct-312f4e">log</span><span class="ct-64b086">(</span><span class="ct-41892f">changed</span><span class="ct-64b086">))</span></span><span class="line"><span class="ct-64b086"> .</span><span class="ct-312f4e">on</span><span class="ct-64b086">(</span><span class="ct-962005">'error'</span><span class="ct-64b086"> </span></span><span class="line"><span class="ct-64b086"> .</span><span class="ct-312f4e">on</span><span class="ct-64b086">(</span><span class="ct-962005">'connected'</span><span class="ct-64b086"> </span><span class="ct-312f4e">log</span><span class="ct-64b086">(</span><span class="ct-41892f">str</span><span class="ct-64b086">))</span></span></code></pre><!--]--></div><h3 id="common-subscribe-method"><a href="#common-subscribe-method"><!--[-->Common Subscribe method<!--]--></a></h3><p><!--[-->Filtering options can also be specified:<!--]--></p><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>typescript</span></button><!--[--><pre><code><span class="line"><span class="ct-64b086"> </span><span class="ct-09b465">let</span><span class="ct-64b086"> </span><span class="ct-41892f">options</span><span class="ct-64b086"> </span><span class="ct-a7723a">=</span><span class="ct-64b086"> {</span></span><span class="line"><span class="ct-64b086"> fromBlock: </span><span class="ct-4b5458">0</span><span class="ct-64b086">,</span></span><span class="line"><span class="ct-64b086"> address: [</span><span class="ct-962005">'address-1'</span><span class="ct-64b086">, </span><span class="ct-962005">'address-2'</span><span class="ct-64b086">], </span><span class="ct-2dcbf5">//Only get events from specific addresses</span></span><span class="line"><span class="ct-64b086"> topics: [] </span><span class="ct-2dcbf5">//What topics to subscribe to</span></span><span class="line"><span class="ct-64b086"> };</span></span><span class="line"></span><span class="line"><span class="ct-64b086"> </span><span class="ct-09b465">let</span><span class="ct-64b086"> </span><span class="ct-41892f">subscription</span><span class="ct-64b086"> </span><span class="ct-a7723a">=</span><span class="ct-64b086"> (</span><span class="ct-962005">'logs'</span><span class="ct-64b086">, </span><span class="ct-41892f">options</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-a7723a">if</span><span class="ct-64b086"> (</span><span class="ct-a7723a">!</span><span class="ct-41892f">err</span><span class="ct-64b086">)</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-41892f">console</span><span class="ct-64b086">.</span><span class="ct-312f4e">log</span><span class="ct-64b086">(</span><span class="ct-41892f">event</span><span class="ct-64b086">)</span></span><span class="line"><span class="ct-64b086"> });</span></span><span class="line"></span><span class="line"><span class="ct-64b086"> </span><span class="ct-41892f">subscription</span><span class="ct-64b086">.</span><span class="ct-312f4e">on</span><span class="ct-64b086">(</span><span class="ct-962005">'data'</span><span class="ct-09b465">=></span><span class="ct-64b086"> </span><span class="ct-41892f">console</span><span class="ct-64b086">.</span><span class="ct-312f4e">log</span><span class="ct-64b086">(</span><span class="ct-41892f">event</span><span class="ct-64b086">))</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-41892f">subscription</span><span class="ct-64b086">.</span><span class="ct-312f4e">on</span><span class="ct-64b086">(</span><span class="ct-962005">'changed'</span><span class="ct-09b465">=></span><span class="ct-64b086"> </span><span class="ct-41892f">console</span><span class="ct-64b086">.</span><span class="ct-312f4e">log</span><span class="ct-64b086">(</span><span class="ct-41892f">changed</span><span class="ct-64b086">))</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-41892f">subscription</span><span class="ct-64b086">.</span><span class="ct-312f4e">on</span><span class="ct-64b086">(</span><span class="ct-962005">'error'</span><span class="ct-09b465">=></span><span class="ct-64b086"> { </span><span class="ct-a7723a">throw</span><span class="ct-64b086"> </span><span class="ct-41892f">err</span><span class="ct-64b086"> })</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-41892f">subscription</span><span class="ct-64b086">.</span><span class="ct-312f4e">on</span><span class="ct-64b086">(</span><span class="ct-962005">'connected'</span><span class="ct-09b465">=></span><span class="ct-64b086"> </span><span class="ct-41892f">console</span><span class="ct-64b086">.</span><span class="ct-312f4e">log</span><span class="ct-64b086">(</span><span class="ct-41892f">nr</span><span class="ct-64b086">))</span></span></code></pre><!--]--></div><h3 id="getting-event-history"><a href="#getting-event-history"><!--[-->Getting event history<!--]--></a></h3><p><!--[-->Getting history for <code><!--[-->Transfer<!--]--></code> events for specific values. More info can be found <a href="https://web3js.readthedocs.io/en/v1.2.11/web3-eth-subscribe.html#" rel="nofollow" target="_blank"><!--[-->here<!--]--></a><!--]--></p><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>typescript</span></button><!--[--><pre><code><span class="line"><span class="ct-64b086"> </span><span class="ct-2dcbf5">//example options(optional)</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-09b465">let</span><span class="ct-64b086"> </span><span class="ct-41892f">options</span><span class="ct-64b086"> </span><span class="ct-a7723a">=</span><span class="ct-64b086"> {</span></span><span class="line"><span class="ct-64b086"> filter: {</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-2dcbf5">// only get events where transfer value was 1000 or 1337</span></span><span class="line"><span class="ct-64b086"> value: [</span><span class="ct-962005">'1000'</span><span class="ct-64b086">, </span><span class="ct-962005">'1337'</span><span class="ct-64b086">] </span></span><span class="line"><span class="ct-64b086"> },</span></span><span class="line"><span class="ct-64b086"> </span><span class="ct-2dcbf5">// number | "earliest" | "pending" | "latest"</span></span><span class="line"><span class="ct-64b086"> fromBlock: </span><span class="ct-4b5458">0</span><span class="ct-64b086">, </span></span><span class="line"><span class="ct-64b086"> toBlock: </span><span class="ct-962005">'latest'</span></span><span class="line"><span class="ct-64b086"> };</span></span><span class="line"></span><span class="line"><span class="ct-64b086"> </span><span class="ct-41892f">myContract</span><span class="ct-64b086">.</span><span class="ct-312f4e">getPastEvents</span><span class="ct-64b086">(</span><span class="ct-962005">'Transfer'</span><span class="ct-64b086">, </span><span class="ct-41892f">options</span><span class="ct-64b086">)</span></span><span class="line"><span class="ct-64b086"> .</span><span class="ct-312f4e">then</span><span class="ct-64b086"> </span><span class="ct-312f4e">log</span><span class="ct-64b086">(</span><span class="ct-41892f">results</span><span class="ct-64b086">))</span></span><span class="line"><span class="ct-64b086"> .</span><span class="ct-312f4e">catch</span><span class="ct-64b086"> </span></span></code></pre><!--]--></div><style>.ct-34fa3c{color:#FFA657}.ct-a93773{color:#A5D6FF}.ct-b75af6{color:#79C0FF}.ct-ed3166{color:#79C0FF}.ct-4b5458{color:#79C0FF}.ct-01dfb8{color:#79C0FF}.ct-09b465{color:#FF7B72}.ct-2dcbf5{color:#8B949E}.ct-f12b07{color:#FFA657}.ct-312f4e{color:#D2A8FF}.ct-650e82{color:#79C0FF}.ct-69cd54{color:#79C0FF}.ct-5b176b{color:#79C0FF}.ct-492994{color:#FFA657}.ct-97fc9e{color:#FF7B72}.ct-adbdaf{color:#D2A8FF}.ct-445399{color:#C9D1D9}.ct-76a269{color:#FF7B72}.ct-962005{color:#A5D6FF}.ct-41892f{color:#C9D1D9}.ct-64b086{color:#C9D1D9}.ct-a7723a{color:#FF7B72}.light .ct-a7723a{color:#859900}.light .ct-64b086{color:#657B83}.light .ct-41892f{color:#268BD2}.light .ct-962005{color:#2AA198}.light .ct-76a269{color:#073642}.light .ct-445399{color:#657B83}.light .ct-adbdaf{color:#268BD2}.light .ct-97fc9e{color:#859900}.light .ct-492994{color:#657B83}.light .ct-5b176b{color:#859900}.light .ct-69cd54{color:#268BD2}.light .ct-650e82{color:#657B83}.light .ct-312f4e{color:#268BD2}.light .ct-f12b07{color:#657B83}.light .ct-2dcbf5{color:#93A1A1}.light .ct-09b465{color:#073642}.light .ct-01dfb8{color:#268BD2}.light .ct-4b5458{color:#D33682}.light .ct-ed3166{color:#859900}.light .ct-b75af6{color:#B58900}.light .ct-a93773{color:#2AA198}.light .ct-34fa3c{color:#268BD2}</style></div></article><!--]--></main><!--]--><!--]--></div><footer class="_footer_ogxvf_1 _footer_1km9a_17 _footer_1km9a_17"><div>btw, have a nice day</div><div class="_filler_ogxvf_9"></div><div> (2018 - 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