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Author: Fedor Katurov <gotham48@gmail.com>
Date: Wed Nov 9 16:15:51 2022 +0600
vault backup: 2022-11-09 16:15:51
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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.fb9e6b9e.js"><link rel="modulepreload" as="script" crossorigin href="/nuxt/default.571c0ab0.js"><link rel="modulepreload" as="script" crossorigin href="/nuxt/LayoutMainMenuToggle.5fa800fc.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.a563326e.js"><link rel="modulepreload" as="script" crossorigin 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_theme_toggle_1hfaq_28"><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-84ece2">import</span><span class="ct-66597a"> { </span><span class="ct-5fb697">Contract</span><span class="ct-66597a"> } </span><span class="ct-84ece2">from</span><span class="ct-66597a"> </span><span class="ct-5650de">'web3-eth-contract'</span><span class="ct-66597a">;</span></span><span class="line"><span class="ct-84ece2">import</span><span class="ct-66597a"> { </span><span class="ct-5fb697">web3</span><span class="ct-66597a"> } </span><span class="ct-84ece2">from</span><span class="ct-66597a"> </span><span class="ct-5650de">'.'</span><span class="ct-66597a">;</span></span><span class="line"></span><span class="line"><span class="ct-937517">const</span><span class="ct-15a02b"> </span><span class="ct-fbab5e">getContract</span><span class="ct-15a02b"> </span><span class="ct-dc5090">=</span><span class="ct-15a02b"> (</span><span class="ct-9f43a9">abi</span><span class="ct-dc5090">:</span><span class="ct-15a02b"> </span><span class="ct-ea53a5">object</span><span class="ct-15a02b">, </span><span class="ct-9f43a9">address</span><span class="ct-dc5090">?:</span><span class="ct-15a02b"> </span><span class="ct-ea53a5">string</span><span class="ct-15a02b">)</span><span class="ct-dc5090">:</span><span class="ct-15a02b"> </span><span class="ct-937517">=></span><span class="ct-15a02b"> {</span></span><span class="line"><span class="ct-15a02b"> </span><span class="ct-937517">const</span><span class="ct-15a02b"> </span><span class="ct-a12cef">abiFromJson</span><span class="ct-15a02b"> </span><span class="ct-dc5090">=</span><span class="ct-15a02b"> </span><span class="ct-cffc8d">JSON</span><span class="ct-15a02b">.</span><span class="ct-a12cef">parse</span><span class="ct-15a02b">(</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-84ece2">return</span><span class="ct-66597a"> </span><span class="ct-84ece2">new</span><span class="ct-66597a"> </span><span class="ct-5fb697">web3</span><span class="ct-66597a">.</span><span class="ct-5fb697">eth</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">Contract</span><span class="ct-66597a">(</span><span class="ct-5fb697">abiFromJson</span><span class="ct-66597a">, </span><span class="ct-5fb697">address</span><span class="ct-66597a">);</span></span><span class="line"><span class="ct-66597a">};</span></span><span class="line"></span><span class="line"><span class="ct-84ece2">export</span><span class="ct-7ab598"> </span><span class="ct-84ece2">default</span><span class="ct-7ab598"> </span><span class="ct-5fb697">getContract</span><span class="ct-66597a">;</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-e665d0">// see example below</span></span><span class="line"><span class="ct-84ece2">import</span><span class="ct-66597a"> { </span><span class="ct-5fb697">getContract</span><span class="ct-66597a"> } </span><span class="ct-84ece2">from</span><span class="ct-66597a"> </span><span class="ct-5650de">'.'</span><span class="ct-66597a">;</span></span><span class="line"></span><span class="line"><span class="ct-e665d0">// ABI of contract</span></span><span class="line"><span class="ct-26a53b">const</span><span class="ct-66597a"> </span><span class="ct-af446c">CONTRACT_ABI</span><span class="ct-66597a"> </span><span class="ct-84ece2">=</span><span class="ct-66597a"> { </span><span class="ct-e665d0">/* ... */</span><span class="ct-66597a"> };</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-e665d0">// address for contract</span></span><span class="line"><span class="ct-26a53b">const</span><span class="ct-66597a"> </span><span class="ct-af446c">CONTRACT_ADDRESS</span><span class="ct-66597a"> </span><span class="ct-84ece2">=</span><span class="ct-66597a"> </span><span class="ct-5650de">'0xdea164f67df4dbfe675d5271c9d404e0260f33bb'</span><span class="ct-66597a">;</span></span><span class="line"></span><span class="line"><span class="ct-84ece2">export</span><span class="ct-66597a"> </span><span class="ct-26a53b">const</span><span class="ct-66597a"> </span><span class="ct-b8e2c1">executeContractMethod</span><span class="ct-66597a"> </span><span class="ct-84ece2">=</span><span class="ct-66597a"> </span><span class="ct-26a53b">async</span><span class="ct-66597a"> ({}) </span><span class="ct-26a53b">=></span><span class="ct-66597a"> {</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-e665d0">// getting contract</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-26a53b">const</span><span class="ct-66597a"> </span><span class="ct-af446c">contract</span><span class="ct-66597a"> </span><span class="ct-84ece2">=</span><span class="ct-66597a"> </span><span class="ct-b8e2c1">getContract</span><span class="ct-66597a">(</span><span class="ct-af446c">CONTRACT_ABI</span><span class="ct-66597a">, </span><span class="ct-af446c">CONTRACT_ADDRESS</span><span class="ct-66597a">);</span></span><span class="line"><span class="ct-66597a"> </span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-e665d0">// Calling write method</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-84ece2">try</span><span class="ct-66597a"> {</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-e665d0">// authorizing with Metamask</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-84ece2">await</span><span class="ct-66597a"> </span><span class="ct-5fb697">web3</span><span class="ct-66597a">.</span><span class="ct-5fb697">currentProvider</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">request</span><span class="ct-66597a">({ method: </span><span class="ct-5650de">'eth_requestAccounts'</span><span class="ct-66597a"> });</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-e665d0">// getting wallet address</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-26a53b">const</span><span class="ct-66597a"> </span><span class="ct-af446c">addressUser</span><span class="ct-66597a"> </span><span class="ct-84ece2">=</span><span class="ct-66597a"> </span><span class="ct-5fb697">web3</span><span class="ct-66597a">.</span><span class="ct-5fb697">currentProvider</span><span class="ct-66597a">.</span><span class="ct-5fb697">selectedAddress</span><span class="ct-66597a">;</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-e665d0">// calling "store" store method for contract</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-e665d0">// payload should include `from` address, that matches</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-e665d0">// current user's wallet</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-84ece2">await</span><span class="ct-66597a"> </span><span class="ct-5fb697">contract</span><span class="ct-66597a">.</span><span class="ct-5fb697">methods</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">store</span><span class="ct-66597a">(</span><span class="ct-953a98">0</span><span class="ct-66597a">, </span><span class="ct-5650de">'Parameter'</span><span class="ct-66597a">).</span><span class="ct-b8e2c1">send</span><span class="ct-66597a">({</span></span><span class="line"><span class="ct-66597a"> from: </span><span class="ct-5fb697">addressUser</span><span class="ct-66597a">,</span></span><span class="line"><span class="ct-66597a"> });</span></span><span class="line"><span class="ct-66597a"> } </span><span class="ct-84ece2">catch</span><span class="ct-66597a"> (</span><span class="ct-5fb697">e</span><span class="ct-66597a">) {</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-84ece2">throw</span><span class="ct-66597a"> </span><span class="ct-84ece2">new</span><span class="ct-66597a"> </span><span class="ct-b684a9">Error</span><span class="ct-66597a">(</span><span class="ct-5fb697">e</span><span class="ct-66597a">);</span></span><span class="line"><span class="ct-66597a"> }</span></span><span class="line"><span class="ct-66597a"> </span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-e665d0">// calling read method</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-84ece2">try</span><span class="ct-66597a"> {</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-e665d0">// this method can return data</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-26a53b">const</span><span class="ct-66597a"> </span><span class="ct-af446c">result</span><span class="ct-66597a"> </span><span class="ct-84ece2">=</span><span class="ct-66597a"> </span><span class="ct-84ece2">await</span><span class="ct-66597a"> </span><span class="ct-5fb697">contract</span><span class="ct-66597a">.</span><span class="ct-5fb697">methods</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">retrieve</span><span class="ct-66597a">().</span><span class="ct-b8e2c1">call</span><span class="ct-66597a">();</span></span><span class="line"><span class="ct-66597a"> } </span><span class="ct-84ece2">catch</span><span class="ct-66597a"> (</span><span class="ct-5fb697">e</span><span class="ct-66597a">) {</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-84ece2">throw</span><span class="ct-66597a"> </span><span class="ct-84ece2">new</span><span class="ct-66597a"> </span><span class="ct-b684a9">Error</span><span class="ct-66597a">(</span><span class="ct-5fb697">e</span><span class="ct-66597a">);</span></span><span class="line"><span class="ct-66597a"> }</span></span><span class="line"><span class="ct-66597a">}</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-e665d0">// see example below</span></span><span class="line"><span class="ct-84ece2">import</span><span class="ct-66597a"> { </span><span class="ct-5fb697">getContract</span><span class="ct-66597a"> } </span><span class="ct-84ece2">from</span><span class="ct-66597a"> </span><span class="ct-5650de">'.'</span><span class="ct-66597a">;</span></span><span class="line"></span><span class="line"><span class="ct-e665d0">// ABI контракта</span></span><span class="line"><span class="ct-26a53b">const</span><span class="ct-66597a"> </span><span class="ct-af446c">CONTRACT_ABI</span><span class="ct-66597a"> </span><span class="ct-84ece2">=</span><span class="ct-66597a"> { </span><span class="ct-e665d0">/* ... */</span><span class="ct-66597a"> };</span></span><span class="line"><span class="ct-e665d0">// contract address</span></span><span class="line"><span class="ct-26a53b">const</span><span class="ct-66597a"> </span><span class="ct-af446c">CONTRACT_ADDRESS</span><span class="ct-66597a"> </span><span class="ct-84ece2">=</span><span class="ct-66597a"> </span><span class="ct-5650de">'0xdea164f67df4dbfe675d5271c9d404e0260f33bb'</span><span class="ct-66597a">;</span></span><span class="line"><span class="ct-e665d0">// getting contract</span></span><span class="line"><span class="ct-26a53b">const</span><span class="ct-66597a"> </span><span class="ct-af446c">contract</span><span class="ct-66597a"> </span><span class="ct-84ece2">=</span><span class="ct-66597a"> </span><span class="ct-b8e2c1">getContract</span><span class="ct-66597a">(</span><span class="ct-af446c">CONTRACT_ABI</span><span class="ct-66597a">, </span><span class="ct-af446c">CONTRACT_ADDRESS</span><span class="ct-66597a">);</span></span><span class="line"><span class="ct-e665d0">// account's private key</span></span><span class="line"><span class="ct-26a53b">const</span><span class="ct-66597a"> </span><span class="ct-af446c">privateKey</span><span class="ct-66597a"> </span><span class="ct-84ece2">=</span><span class="ct-66597a"> </span><span class="ct-5650de">'...'</span><span class="ct-66597a">;</span></span><span class="line"></span><span class="line"><span class="ct-e665d0">// write-methods requires private key</span></span><span class="line"><span class="ct-937517">const</span><span class="ct-15a02b"> </span><span class="ct-fbab5e">executeContractMethod</span><span class="ct-15a02b"> </span><span class="ct-dc5090">=</span><span class="ct-15a02b"> </span><span class="ct-937517">async</span><span class="ct-15a02b"> (</span><span class="ct-9f43a9">val</span><span class="ct-dc5090">:</span><span class="ct-15a02b"> </span><span class="ct-ea53a5">number</span><span class="ct-15a02b">) </span><span class="ct-937517">=></span><span class="ct-15a02b"> {</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-26a53b">const</span><span class="ct-66597a"> </span><span class="ct-af446c">transaction</span><span class="ct-66597a"> </span><span class="ct-84ece2">=</span><span class="ct-66597a"> </span><span class="ct-5fb697">contract</span><span class="ct-66597a">.</span><span class="ct-5fb697">methods</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">store</span><span class="ct-66597a">(</span><span class="ct-5fb697">val</span><span class="ct-66597a">);</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-26a53b">const</span><span class="ct-66597a"> </span><span class="ct-af446c">account</span><span class="ct-66597a"> </span><span class="ct-84ece2">=</span><span class="ct-66597a"> </span><span class="ct-5fb697">web3</span><span class="ct-66597a">.</span><span class="ct-5fb697">eth</span><span class="ct-66597a">.</span><span class="ct-5fb697">accounts</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">privateKeyToAccount</span><span class="ct-66597a">(</span><span class="ct-5fb697">privateKey</span><span class="ct-66597a">);</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-26a53b">const</span><span class="ct-66597a"> </span><span class="ct-af446c">options</span><span class="ct-66597a"> </span><span class="ct-84ece2">=</span><span class="ct-66597a"> {</span></span><span class="line"><span class="ct-66597a"> to: </span><span class="ct-af446c">CONTRACT_ADDRESS</span><span class="ct-66597a">,</span></span><span class="line"><span class="ct-66597a"> data: </span><span class="ct-5fb697">transaction</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">encodeABI</span><span class="ct-66597a">(),</span></span><span class="line"><span class="ct-66597a"> gas: </span><span class="ct-84ece2">await</span><span class="ct-66597a"> </span><span class="ct-5fb697">transaction</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">estimateGas</span><span class="ct-66597a">({ from: </span><span class="ct-5fb697">account</span><span class="ct-66597a">.</span><span class="ct-5fb697">address</span><span class="ct-66597a"> }),</span></span><span class="line"><span class="ct-66597a"> gasPrice: </span><span class="ct-84ece2">await</span><span class="ct-66597a"> </span><span class="ct-5fb697">web3</span><span class="ct-66597a">.</span><span class="ct-5fb697">eth</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">getGasPrice</span><span class="ct-66597a">(),</span></span><span class="line"><span class="ct-66597a"> };</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-26a53b">const</span><span class="ct-66597a"> </span><span class="ct-af446c">signed</span><span class="ct-66597a"> </span><span class="ct-84ece2">=</span><span class="ct-66597a"> </span><span class="ct-84ece2">await</span><span class="ct-66597a"> </span><span class="ct-5fb697">web3</span><span class="ct-66597a">.</span><span class="ct-5fb697">eth</span><span class="ct-66597a">.</span><span class="ct-5fb697">accounts</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">signTransaction</span><span class="ct-66597a">(</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-5fb697">options</span><span class="ct-66597a">,</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-5fb697">privateKey</span><span class="ct-66597a">,</span></span><span class="line"><span class="ct-66597a"> );</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-84ece2">await</span><span class="ct-66597a"> </span><span class="ct-5fb697">web3</span><span class="ct-66597a">.</span><span class="ct-5fb697">eth</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">sendSignedTransaction</span><span class="ct-66597a">(</span><span class="ct-5fb697">signed</span><span class="ct-66597a">.</span><span class="ct-5fb697">rawTransaction</span><span class="ct-84ece2">!</span><span class="ct-66597a">);</span></span><span class="line"><span class="ct-66597a">};</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-66597a"> </span><span class="ct-26a53b">const</span><span class="ct-66597a"> </span><span class="ct-af446c">requests</span><span class="ct-66597a"> </span><span class="ct-84ece2">=</span><span class="ct-66597a"> [</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-5fb697">contract</span><span class="ct-66597a">.</span><span class="ct-5fb697">method</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">balanceOf</span><span class="ct-66597a">().</span><span class="ct-5fb697">call</span><span class="ct-66597a">,</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-5fb697">contract</span><span class="ct-66597a">.</span><span class="ct-5fb697">method</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">getStaked</span><span class="ct-66597a">().</span><span class="ct-5fb697">call</span></span><span class="line"><span class="ct-66597a"> ]</span></span><span class="line"></span><span class="line"><span class="ct-66597a"> </span><span class="ct-26a53b">const</span><span class="ct-66597a"> </span><span class="ct-af446c">result</span><span class="ct-66597a"> </span><span class="ct-84ece2">=</span><span class="ct-66597a"> </span><span class="ct-84ece2">await</span><span class="ct-66597a"> </span><span class="ct-b8e2c1">makeBatchRequest</span><span class="ct-66597a">(</span><span class="ct-5fb697">request</span><span class="ct-66597a">);</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-26a53b">const</span><span class="ct-66597a"> </span><span class="ct-af446c">web3</span><span class="ct-66597a"> </span><span class="ct-84ece2">=</span><span class="ct-66597a"> </span><span class="ct-84ece2">new</span><span class="ct-66597a"> </span><span class="ct-b8e2c1">Web3</span><span class="ct-66597a">(</span><span class="ct-5fb697">Web3</span><span class="ct-66597a">.</span><span class="ct-5fb697">givenProvider</span><span class="ct-66597a"> </span><span class="ct-84ece2">||</span><span class="ct-66597a"> </span><span class="ct-af446c">PROVIDER_URL</span><span class="ct-66597a">);</span></span><span class="line"></span><span class="line"><span class="ct-937517">const</span><span class="ct-15a02b"> </span><span class="ct-fbab5e">makeBatchRequest</span><span class="ct-15a02b"> </span><span class="ct-dc5090">=</span><span class="ct-15a02b"> (</span><span class="ct-9f43a9">calls</span><span class="ct-dc5090">:</span><span class="ct-15a02b"> </span><span class="ct-ea53a5">any</span><span class="ct-15a02b">[]) </span><span class="ct-937517">=></span><span class="ct-15a02b"> {</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-84ece2">try</span><span class="ct-66597a"> {</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-26a53b">const</span><span class="ct-66597a"> </span><span class="ct-af446c">web3</span><span class="ct-66597a"> </span><span class="ct-84ece2">=</span><span class="ct-66597a"> </span><span class="ct-b8e2c1">getWeb3NoAccount</span><span class="ct-66597a">();</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-26a53b">const</span><span class="ct-66597a"> </span><span class="ct-af446c">batch</span><span class="ct-66597a"> </span><span class="ct-84ece2">=</span><span class="ct-66597a"> </span><span class="ct-84ece2">new</span><span class="ct-66597a"> </span><span class="ct-5fb697">web3</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">BatchRequest</span><span class="ct-66597a">();</span></span><span class="line"></span><span class="line"><span class="ct-66597a"> </span><span class="ct-26a53b">const</span><span class="ct-66597a"> </span><span class="ct-af446c">promises</span><span class="ct-66597a"> </span><span class="ct-84ece2">=</span><span class="ct-66597a"> </span><span class="ct-5fb697">calls</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">map</span><span class="ct-26a53b">=></span><span class="ct-66597a"> {</span></span><span class="line"><span class="ct-15a02b"> </span><span class="ct-dc5090">return</span><span class="ct-15a02b"> </span><span class="ct-dc5090">new</span><span class="ct-15a02b"> </span><span class="ct-ea53a5">Promise</span><span class="ct-15a02b">((</span><span class="ct-9f43a9">resolve</span><span class="ct-15a02b">, </span><span class="ct-9f43a9">reject</span><span class="ct-15a02b">) </span><span class="ct-937517">=></span><span class="ct-15a02b"> {</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-5fb697">batch</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">add</span><span class="ct-66597a">(</span></span><span class="line"></span><span class="line"><span class="ct-66597a"> </span><span class="ct-84ece2">if</span><span class="ct-66597a"> (</span><span class="ct-5fb697">err</span><span class="ct-66597a">) {</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-b8e2c1">reject</span><span class="ct-66597a">(</span><span class="ct-5fb697">err</span><span class="ct-66597a">);</span></span><span class="line"><span class="ct-66597a"> } </span><span class="ct-84ece2">else</span><span class="ct-66597a"> {</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-b8e2c1">resolve</span><span class="ct-66597a">(</span><span class="ct-5fb697">result</span><span class="ct-66597a">);</span></span><span class="line"><span class="ct-66597a"> }</span></span><span class="line"><span class="ct-66597a"> })</span></span><span class="line"><span class="ct-66597a"> );</span></span><span class="line"><span class="ct-66597a"> });</span></span><span class="line"><span class="ct-66597a"> });</span></span><span class="line"></span><span class="line"><span class="ct-66597a"> </span><span class="ct-5fb697">batch</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">execute</span><span class="ct-66597a">();</span></span><span class="line"></span><span class="line"><span class="ct-66597a"> </span><span class="ct-84ece2">return</span><span class="ct-66597a"> </span><span class="ct-b684a9">Promise</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">all</span><span class="ct-66597a">(</span><span class="ct-5fb697">promises</span><span class="ct-66597a">);</span></span><span class="line"><span class="ct-66597a"> } </span><span class="ct-84ece2">catch</span><span class="ct-66597a"> {</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-84ece2">return</span><span class="ct-66597a"> </span><span class="ct-533c8a">null</span><span class="ct-66597a">;</span></span><span class="line"><span class="ct-66597a"> }</span></span><span class="line"><span class="ct-66597a">};</span></span><span class="line"></span><span class="line"><span class="ct-84ece2">export</span><span class="ct-7ab598"> </span><span class="ct-84ece2">default</span><span class="ct-7ab598"> </span><span class="ct-5fb697">makeBatchRequest</span><span class="ct-66597a">;</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-66597a"> </span><span class="ct-84ece2">import</span><span class="ct-66597a"> </span><span class="ct-5fb697">Web3</span><span class="ct-66597a"> </span><span class="ct-84ece2">from</span><span class="ct-66597a"> </span><span class="ct-5650de">'web3'</span><span class="ct-66597a">;</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-26a53b">const</span><span class="ct-66597a"> </span><span class="ct-af446c">web3</span><span class="ct-66597a"> </span><span class="ct-84ece2">=</span><span class="ct-66597a"> </span><span class="ct-84ece2">new</span><span class="ct-66597a"> </span><span class="ct-b8e2c1">Web3</span><span class="ct-66597a">(</span><span class="ct-5650de">'YOUR_RPC_ENDPOINT_HERE'</span><span class="ct-66597a">);</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-26a53b">const</span><span class="ct-66597a"> </span><span class="ct-af446c">ABI</span><span class="ct-66597a"> </span><span class="ct-84ece2">=</span><span class="ct-66597a"> </span><span class="ct-5650de">'YOUR ABI HERE'</span><span class="ct-66597a">;</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-26a53b">const</span><span class="ct-66597a"> </span><span class="ct-af446c">CONTRACT_ADDRESS</span><span class="ct-66597a"> </span><span class="ct-84ece2">=</span><span class="ct-66597a"> </span><span class="ct-5650de">'YOUR CONTRACT ADDRESS HERE'</span><span class="ct-66597a">;</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-26a53b">const</span><span class="ct-66597a"> </span><span class="ct-af446c">myContract</span><span class="ct-66597a"> </span><span class="ct-84ece2">=</span><span class="ct-66597a"> </span><span class="ct-84ece2">new</span><span class="ct-66597a"> </span><span class="ct-5fb697">Web3</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">Contract</span><span class="ct-66597a">(</span><span class="ct-af446c">ABI</span><span class="ct-66597a">, </span><span class="ct-af446c">CONTRACT_ADDRESS</span><span class="ct-66597a">);</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-5fb697">referralProgramContract</span><span class="ct-66597a">.</span><span class="ct-5fb697">events</span></span><span class="line"><span class="ct-66597a"> .</span><span class="ct-b8e2c1">RegisterUser</span><span class="ct-66597a">()</span></span><span class="line"><span class="ct-15a02b"> .</span><span class="ct-fbab5e">on</span><span class="ct-15a02b">(</span><span class="ct-ba2d26">'connected'</span><span class="ct-15a02b">, (</span><span class="ct-9f43a9">subscriptionId</span><span class="ct-dc5090">:</span><span class="ct-15a02b"> </span><span class="ct-ea53a5">string</span><span class="ct-15a02b">) </span><span class="ct-937517">=></span><span class="ct-15a02b"> {</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-5fb697">console</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">log</span><span class="ct-66597a">(</span><span class="ct-5650de">`| UserRegistered | events | ${</span><span class="ct-5fb697">subscriptionId</span><span class="ct-5650de">}`</span><span class="ct-66597a">);</span></span><span class="line"><span class="ct-66597a"> })</span></span><span class="line"><span class="ct-66597a"> .</span><span class="ct-b8e2c1">on</span><span class="ct-66597a">(</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-5650de">'data'</span><span class="ct-66597a">,</span></span><span class="line"><span class="ct-15a02b"> </span><span class="ct-937517">async</span><span class="ct-15a02b"> (</span><span class="ct-9f43a9">event</span><span class="ct-dc5090">:</span><span class="ct-15a02b"> {</span></span><span class="line"><span class="ct-15a02b"> </span><span class="ct-9f43a9">removed</span><span class="ct-dc5090">:</span><span class="ct-15a02b"> </span><span class="ct-ea53a5">boolean</span><span class="ct-15a02b">;</span></span><span class="line"><span class="ct-15a02b"> </span><span class="ct-9f43a9">returnValues</span><span class="ct-dc5090">:</span><span class="ct-15a02b"> </span><span class="ct-5f6d82">RegisterUserResponseInterface</span><span class="ct-15a02b">;</span></span><span class="line"><span class="ct-66597a"> }) </span><span class="ct-26a53b">=></span><span class="ct-66597a"> {</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-84ece2">try</span><span class="ct-66597a"> {</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-84ece2">if</span><span class="ct-66597a"> (</span><span class="ct-5fb697">event</span><span class="ct-66597a">.</span><span class="ct-5fb697">removed</span><span class="ct-66597a">) {</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-84ece2">return</span><span class="ct-66597a">;</span></span><span class="line"><span class="ct-66597a"> }</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-26a53b">const</span><span class="ct-66597a"> { </span><span class="ct-af446c">user</span><span class="ct-66597a">, </span><span class="ct-af446c">referrer</span><span class="ct-66597a"> } </span><span class="ct-84ece2">=</span><span class="ct-66597a"> </span><span class="ct-5fb697">event</span><span class="ct-66597a">.</span><span class="ct-5fb697">returnValues</span><span class="ct-66597a">;</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-5fb697">console</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">log</span><span class="ct-66597a">(</span><span class="ct-5fb697">user</span><span class="ct-66597a">, </span><span class="ct-5fb697">referrer</span><span class="ct-66597a">);</span></span><span class="line"><span class="ct-66597a"> } </span><span class="ct-84ece2">catch</span><span class="ct-66597a"> (</span><span class="ct-5fb697">e</span><span class="ct-66597a">) {</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-5fb697">console</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">log</span><span class="ct-66597a">(</span><span class="ct-5650de">`| ONCE | ${</span><span class="ct-5fb697">e</span><span class="ct-5650de">}`</span><span class="ct-66597a">);</span></span><span class="line"><span class="ct-66597a"> }</span></span><span class="line"><span class="ct-66597a"> },</span></span><span class="line"><span class="ct-66597a"> )</span></span><span class="line"><span class="ct-15a02b"> .</span><span class="ct-fbab5e">on</span><span class="ct-15a02b">(</span><span class="ct-ba2d26">'error'</span><span class="ct-15a02b">, (</span><span class="ct-9f43a9">error</span><span class="ct-dc5090">:</span><span class="ct-15a02b"> </span><span class="ct-5f6d82">ErrnoException</span><span class="ct-15a02b">) </span><span class="ct-937517">=></span><span class="ct-15a02b"> {</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-5fb697">console</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">log</span><span class="ct-66597a">(</span><span class="ct-5fb697">error</span><span class="ct-66597a">);</span></span><span class="line"><span class="ct-66597a"> });</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-66597a"> </span><span class="ct-26a53b">let</span><span class="ct-66597a"> </span><span class="ct-5fb697">options</span><span class="ct-66597a"> </span><span class="ct-84ece2">=</span><span class="ct-66597a"> {</span></span><span class="line"><span class="ct-66597a"> filter: {</span></span><span class="line"><span class="ct-66597a"> value: [],</span></span><span class="line"><span class="ct-66597a"> },</span></span><span class="line"><span class="ct-66597a"> fromBlock: </span><span class="ct-953a98">0</span></span><span class="line"><span class="ct-66597a"> };</span></span><span class="line"></span><span class="line"><span class="ct-66597a"> </span><span class="ct-5fb697">myContract</span><span class="ct-66597a">.</span><span class="ct-5fb697">events</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">Transfer</span><span class="ct-66597a">(</span><span class="ct-5fb697">options</span><span class="ct-66597a">)</span></span><span class="line"><span class="ct-66597a"> .</span><span class="ct-b8e2c1">on</span><span class="ct-66597a">(</span><span class="ct-5650de">'data'</span><span class="ct-66597a"> </span><span class="ct-b8e2c1">log</span><span class="ct-66597a">(</span><span class="ct-5fb697">event</span><span class="ct-66597a">))</span></span><span class="line"><span class="ct-66597a"> .</span><span class="ct-b8e2c1">on</span><span class="ct-66597a">(</span><span class="ct-5650de">'changed'</span><span class="ct-66597a"> </span><span class="ct-b8e2c1">log</span><span class="ct-66597a">(</span><span class="ct-5fb697">changed</span><span class="ct-66597a">))</span></span><span class="line"><span class="ct-66597a"> .</span><span class="ct-b8e2c1">on</span><span class="ct-66597a">(</span><span class="ct-5650de">'error'</span><span class="ct-66597a"> </span></span><span class="line"><span class="ct-66597a"> .</span><span class="ct-b8e2c1">on</span><span class="ct-66597a">(</span><span class="ct-5650de">'connected'</span><span class="ct-66597a"> </span><span class="ct-b8e2c1">log</span><span class="ct-66597a">(</span><span class="ct-5fb697">str</span><span class="ct-66597a">))</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-66597a"> </span><span class="ct-26a53b">let</span><span class="ct-66597a"> </span><span class="ct-5fb697">options</span><span class="ct-66597a"> </span><span class="ct-84ece2">=</span><span class="ct-66597a"> {</span></span><span class="line"><span class="ct-66597a"> fromBlock: </span><span class="ct-953a98">0</span><span class="ct-66597a">,</span></span><span class="line"><span class="ct-66597a"> address: [</span><span class="ct-5650de">'address-1'</span><span class="ct-66597a">, </span><span class="ct-5650de">'address-2'</span><span class="ct-66597a">], </span><span class="ct-e665d0">//Only get events from specific addresses</span></span><span class="line"><span class="ct-66597a"> topics: [] </span><span class="ct-e665d0">//What topics to subscribe to</span></span><span class="line"><span class="ct-66597a"> };</span></span><span class="line"></span><span class="line"><span class="ct-66597a"> </span><span class="ct-26a53b">let</span><span class="ct-66597a"> </span><span class="ct-5fb697">subscription</span><span class="ct-66597a"> </span><span class="ct-84ece2">=</span><span class="ct-66597a"> (</span><span class="ct-5650de">'logs'</span><span class="ct-66597a">, </span><span class="ct-5fb697">options</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-84ece2">if</span><span class="ct-66597a"> (</span><span class="ct-84ece2">!</span><span class="ct-5fb697">err</span><span class="ct-66597a">)</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-5fb697">console</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">log</span><span class="ct-66597a">(</span><span class="ct-5fb697">event</span><span class="ct-66597a">)</span></span><span class="line"><span class="ct-66597a"> });</span></span><span class="line"></span><span class="line"><span class="ct-66597a"> </span><span class="ct-5fb697">subscription</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">on</span><span class="ct-66597a">(</span><span class="ct-5650de">'data'</span><span class="ct-26a53b">=></span><span class="ct-66597a"> </span><span class="ct-5fb697">console</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">log</span><span class="ct-66597a">(</span><span class="ct-5fb697">event</span><span class="ct-66597a">))</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-5fb697">subscription</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">on</span><span class="ct-66597a">(</span><span class="ct-5650de">'changed'</span><span class="ct-26a53b">=></span><span class="ct-66597a"> </span><span class="ct-5fb697">console</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">log</span><span class="ct-66597a">(</span><span class="ct-5fb697">changed</span><span class="ct-66597a">))</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-5fb697">subscription</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">on</span><span class="ct-66597a">(</span><span class="ct-5650de">'error'</span><span class="ct-26a53b">=></span><span class="ct-66597a"> { </span><span class="ct-84ece2">throw</span><span class="ct-66597a"> </span><span class="ct-5fb697">err</span><span class="ct-66597a"> })</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-5fb697">subscription</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">on</span><span class="ct-66597a">(</span><span class="ct-5650de">'connected'</span><span class="ct-26a53b">=></span><span class="ct-66597a"> </span><span class="ct-5fb697">console</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">log</span><span class="ct-66597a">(</span><span class="ct-5fb697">nr</span><span class="ct-66597a">))</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-66597a"> </span><span class="ct-e665d0">//example options(optional)</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-26a53b">let</span><span class="ct-66597a"> </span><span class="ct-5fb697">options</span><span class="ct-66597a"> </span><span class="ct-84ece2">=</span><span class="ct-66597a"> {</span></span><span class="line"><span class="ct-66597a"> filter: {</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-e665d0">// only get events where transfer value was 1000 or 1337</span></span><span class="line"><span class="ct-66597a"> value: [</span><span class="ct-5650de">'1000'</span><span class="ct-66597a">, </span><span class="ct-5650de">'1337'</span><span class="ct-66597a">] </span></span><span class="line"><span class="ct-66597a"> },</span></span><span class="line"><span class="ct-66597a"> </span><span class="ct-e665d0">// number | "earliest" | "pending" | "latest"</span></span><span class="line"><span class="ct-66597a"> fromBlock: </span><span class="ct-953a98">0</span><span class="ct-66597a">, </span></span><span class="line"><span class="ct-66597a"> toBlock: </span><span class="ct-5650de">'latest'</span></span><span class="line"><span class="ct-66597a"> };</span></span><span class="line"></span><span class="line"><span class="ct-66597a"> </span><span class="ct-5fb697">myContract</span><span class="ct-66597a">.</span><span class="ct-b8e2c1">getPastEvents</span><span class="ct-66597a">(</span><span class="ct-5650de">'Transfer'</span><span class="ct-66597a">, </span><span class="ct-5fb697">options</span><span class="ct-66597a">)</span></span><span class="line"><span class="ct-66597a"> .</span><span class="ct-b8e2c1">then</span><span class="ct-66597a"> </span><span class="ct-b8e2c1">log</span><span class="ct-66597a">(</span><span class="ct-5fb697">results</span><span class="ct-66597a">))</span></span><span class="line"><span class="ct-66597a"> .</span><span class="ct-b8e2c1">catch</span><span class="ct-66597a"> </span></span></code></pre><!--]--></div><style>.ct-5f6d82{color:#FFA657}.ct-ba2d26{color:#A5D6FF}.ct-533c8a{color:#79C0FF}.ct-b684a9{color:#79C0FF}.ct-953a98{color:#79C0FF}.ct-af446c{color:#79C0FF}.ct-26a53b{color:#FF7B72}.ct-e665d0{color:#8B949E}.ct-7ab598{color:#FFA657}.ct-b8e2c1{color:#D2A8FF}.ct-cffc8d{color:#79C0FF}.ct-a12cef{color:#79C0FF}.ct-ea53a5{color:#79C0FF}.ct-9f43a9{color:#FFA657}.ct-dc5090{color:#FF7B72}.ct-fbab5e{color:#D2A8FF}.ct-15a02b{color:#C9D1D9}.ct-937517{color:#FF7B72}.ct-5650de{color:#A5D6FF}.ct-5fb697{color:#C9D1D9}.ct-66597a{color:#C9D1D9}.ct-84ece2{color:#FF7B72}.light .ct-84ece2{color:#859900}.light .ct-66597a{color:#657B83}.light .ct-5fb697{color:#268BD2}.light .ct-5650de{color:#2AA198}.light .ct-937517{color:#073642}.light .ct-15a02b{color:#657B83}.light .ct-fbab5e{color:#268BD2}.light .ct-dc5090{color:#859900}.light .ct-9f43a9{color:#657B83}.light .ct-ea53a5{color:#859900}.light .ct-a12cef{color:#268BD2}.light .ct-cffc8d{color:#657B83}.light .ct-b8e2c1{color:#268BD2}.light .ct-7ab598{color:#657B83}.light .ct-e665d0{color:#93A1A1}.light .ct-26a53b{color:#073642}.light .ct-af446c{color:#268BD2}.light .ct-953a98{color:#D33682}.light .ct-b684a9{color:#859900}.light .ct-533c8a{color:#B58900}.light .ct-ba2d26{color:#2AA198}.light .ct-5f6d82{color:#268BD2}</style></div></article><!--]--></main><!--]--><!--]--></div><footer class="_footer_ogxvf_1 _footer_1hfaq_22 _footer_1hfaq_22"><div>btw, have a nice day</div><div class="_filler_ogxvf_9"></div><div> (2018 - 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