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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.ff078795.js"><link rel="modulepreload" as="script" crossorigin href="/nuxt/default.19fa1ed2.js"><link rel="modulepreload" as="script" crossorigin href="/nuxt/LayoutMainMenuToggle.d9b44fd0.js"><link rel="modulepreload" as="script" crossorigin href="/nuxt/LayoutMainMenuToggle.vue_used_vue_type_style_index_0_lang.module.fbcd3219.js"><link rel="preload" as="style" href="/nuxt/LayoutMainMenuToggle.vue_used_vue_type_style_index_0_lang.17e7aae7.css"><link rel="modulepreload" as="script" crossorigin href="/nuxt/LayoutMainMenu.9973dade.js"><link rel="modulepreload" as="script" crossorigin 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Guards</a></div><!--]--></div></div></div><!--]--></nav></div></div><div class="_main_16c5m_17"><div class="_content_16c5m_93"><div class="_wrapper_vom09_1" hastransition="true"><div class="_content_vom09_14"><button class="_theme_toggle_vom09_24 _button_jz7in_1 _theme_toggle_vom09_24"><span></span></button><!--[--><!--[--><main class="_content_1gz79_1"><!--[--><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-f94398">import</span><span class="ct-a4055a"> { </span><span class="ct-c5b0a7">Contract</span><span class="ct-a4055a"> } </span><span class="ct-f94398">from</span><span class="ct-a4055a"> </span><span class="ct-6fce38">'web3-eth-contract'</span><span class="ct-a4055a">;</span></span><span class="line"><span class="ct-f94398">import</span><span class="ct-a4055a"> { </span><span class="ct-c5b0a7">web3</span><span class="ct-a4055a"> } </span><span class="ct-f94398">from</span><span class="ct-a4055a"> </span><span class="ct-6fce38">'.'</span><span class="ct-a4055a">;</span></span><span class="line"></span><span class="line"><span class="ct-2abfb1">const</span><span class="ct-45d7b8"> </span><span class="ct-5a0548">getContract</span><span class="ct-45d7b8"> </span><span class="ct-6edfd6">=</span><span class="ct-45d7b8"> (</span><span class="ct-3fc15e">abi</span><span class="ct-6edfd6">:</span><span class="ct-45d7b8"> </span><span class="ct-d4b225">object</span><span class="ct-45d7b8">, </span><span class="ct-3fc15e">address</span><span class="ct-6edfd6">?:</span><span class="ct-45d7b8"> </span><span class="ct-d4b225">string</span><span class="ct-45d7b8">)</span><span class="ct-6edfd6">:</span><span class="ct-45d7b8"> </span><span class="ct-2abfb1">=></span><span class="ct-45d7b8"> {</span></span><span class="line"><span class="ct-45d7b8"> </span><span class="ct-2abfb1">const</span><span class="ct-45d7b8"> </span><span class="ct-0060f1">abiFromJson</span><span class="ct-45d7b8"> </span><span class="ct-6edfd6">=</span><span class="ct-45d7b8"> </span><span class="ct-088577">JSON</span><span class="ct-45d7b8">.</span><span class="ct-0060f1">parse</span><span class="ct-45d7b8">(</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-f94398">return</span><span class="ct-a4055a"> </span><span class="ct-f94398">new</span><span class="ct-a4055a"> </span><span class="ct-c5b0a7">web3</span><span class="ct-a4055a">.</span><span class="ct-c5b0a7">eth</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">Contract</span><span class="ct-a4055a">(</span><span class="ct-c5b0a7">abiFromJson</span><span class="ct-a4055a">, </span><span class="ct-c5b0a7">address</span><span class="ct-a4055a">);</span></span><span class="line"><span class="ct-a4055a">};</span></span><span class="line"></span><span class="line"><span class="ct-f94398">export</span><span class="ct-9cf48c"> </span><span class="ct-f94398">default</span><span class="ct-9cf48c"> </span><span class="ct-c5b0a7">getContract</span><span class="ct-a4055a">;</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-7df6f6">// see example below</span></span><span class="line"><span class="ct-f94398">import</span><span class="ct-a4055a"> { </span><span class="ct-c5b0a7">getContract</span><span class="ct-a4055a"> } </span><span class="ct-f94398">from</span><span class="ct-a4055a"> </span><span class="ct-6fce38">'.'</span><span class="ct-a4055a">;</span></span><span class="line"></span><span class="line"><span class="ct-7df6f6">// ABI of contract</span></span><span class="line"><span class="ct-92ce42">const</span><span class="ct-a4055a"> </span><span class="ct-3c8b8d">CONTRACT_ABI</span><span class="ct-a4055a"> </span><span class="ct-f94398">=</span><span class="ct-a4055a"> { </span><span class="ct-7df6f6">/* ... */</span><span class="ct-a4055a"> };</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-7df6f6">// address for contract</span></span><span class="line"><span class="ct-92ce42">const</span><span class="ct-a4055a"> </span><span class="ct-3c8b8d">CONTRACT_ADDRESS</span><span class="ct-a4055a"> </span><span class="ct-f94398">=</span><span class="ct-a4055a"> </span><span class="ct-6fce38">'0xdea164f67df4dbfe675d5271c9d404e0260f33bb'</span><span class="ct-a4055a">;</span></span><span class="line"></span><span class="line"><span class="ct-f94398">export</span><span class="ct-a4055a"> </span><span class="ct-92ce42">const</span><span class="ct-a4055a"> </span><span class="ct-94e6dd">executeContractMethod</span><span class="ct-a4055a"> </span><span class="ct-f94398">=</span><span class="ct-a4055a"> </span><span class="ct-92ce42">async</span><span class="ct-a4055a"> ({}) </span><span class="ct-92ce42">=></span><span class="ct-a4055a"> {</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-7df6f6">// getting contract</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-92ce42">const</span><span class="ct-a4055a"> </span><span class="ct-3c8b8d">contract</span><span class="ct-a4055a"> </span><span class="ct-f94398">=</span><span class="ct-a4055a"> </span><span class="ct-94e6dd">getContract</span><span class="ct-a4055a">(</span><span class="ct-3c8b8d">CONTRACT_ABI</span><span class="ct-a4055a">, </span><span class="ct-3c8b8d">CONTRACT_ADDRESS</span><span class="ct-a4055a">);</span></span><span class="line"><span class="ct-a4055a"> </span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-7df6f6">// Calling write method</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-f94398">try</span><span class="ct-a4055a"> {</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-7df6f6">// authorizing with Metamask</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-f94398">await</span><span class="ct-a4055a"> </span><span class="ct-c5b0a7">web3</span><span class="ct-a4055a">.</span><span class="ct-c5b0a7">currentProvider</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">request</span><span class="ct-a4055a">({ method: </span><span class="ct-6fce38">'eth_requestAccounts'</span><span class="ct-a4055a"> });</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-7df6f6">// getting wallet address</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-92ce42">const</span><span class="ct-a4055a"> </span><span class="ct-3c8b8d">addressUser</span><span class="ct-a4055a"> </span><span class="ct-f94398">=</span><span class="ct-a4055a"> </span><span class="ct-c5b0a7">web3</span><span class="ct-a4055a">.</span><span class="ct-c5b0a7">currentProvider</span><span class="ct-a4055a">.</span><span class="ct-c5b0a7">selectedAddress</span><span class="ct-a4055a">;</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-7df6f6">// calling "store" store method for contract</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-7df6f6">// payload should include `from` address, that matches</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-7df6f6">// current user's wallet</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-f94398">await</span><span class="ct-a4055a"> </span><span class="ct-c5b0a7">contract</span><span class="ct-a4055a">.</span><span class="ct-c5b0a7">methods</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">store</span><span class="ct-a4055a">(</span><span class="ct-a0d1f4">0</span><span class="ct-a4055a">, </span><span class="ct-6fce38">'Parameter'</span><span class="ct-a4055a">).</span><span class="ct-94e6dd">send</span><span class="ct-a4055a">({</span></span><span class="line"><span class="ct-a4055a"> from: </span><span class="ct-c5b0a7">addressUser</span><span class="ct-a4055a">,</span></span><span class="line"><span class="ct-a4055a"> });</span></span><span class="line"><span class="ct-a4055a"> } </span><span class="ct-f94398">catch</span><span class="ct-a4055a"> (</span><span class="ct-c5b0a7">e</span><span class="ct-a4055a">) {</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-f94398">throw</span><span class="ct-a4055a"> </span><span class="ct-f94398">new</span><span class="ct-a4055a"> </span><span class="ct-dfea04">Error</span><span class="ct-a4055a">(</span><span class="ct-c5b0a7">e</span><span class="ct-a4055a">);</span></span><span class="line"><span class="ct-a4055a"> }</span></span><span class="line"><span class="ct-a4055a"> </span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-7df6f6">// calling read method</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-f94398">try</span><span class="ct-a4055a"> {</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-7df6f6">// this method can return data</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-92ce42">const</span><span class="ct-a4055a"> </span><span class="ct-3c8b8d">result</span><span class="ct-a4055a"> </span><span class="ct-f94398">=</span><span class="ct-a4055a"> </span><span class="ct-f94398">await</span><span class="ct-a4055a"> </span><span class="ct-c5b0a7">contract</span><span class="ct-a4055a">.</span><span class="ct-c5b0a7">methods</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">retrieve</span><span class="ct-a4055a">().</span><span class="ct-94e6dd">call</span><span class="ct-a4055a">();</span></span><span class="line"><span class="ct-a4055a"> } </span><span class="ct-f94398">catch</span><span class="ct-a4055a"> (</span><span class="ct-c5b0a7">e</span><span class="ct-a4055a">) {</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-f94398">throw</span><span class="ct-a4055a"> </span><span class="ct-f94398">new</span><span class="ct-a4055a"> </span><span class="ct-dfea04">Error</span><span class="ct-a4055a">(</span><span class="ct-c5b0a7">e</span><span class="ct-a4055a">);</span></span><span class="line"><span class="ct-a4055a"> }</span></span><span class="line"><span class="ct-a4055a">}</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-7df6f6">// see example below</span></span><span class="line"><span class="ct-f94398">import</span><span class="ct-a4055a"> { </span><span class="ct-c5b0a7">getContract</span><span class="ct-a4055a"> } </span><span class="ct-f94398">from</span><span class="ct-a4055a"> </span><span class="ct-6fce38">'.'</span><span class="ct-a4055a">;</span></span><span class="line"></span><span class="line"><span class="ct-7df6f6">// ABI контракта</span></span><span class="line"><span class="ct-92ce42">const</span><span class="ct-a4055a"> </span><span class="ct-3c8b8d">CONTRACT_ABI</span><span class="ct-a4055a"> </span><span class="ct-f94398">=</span><span class="ct-a4055a"> { </span><span class="ct-7df6f6">/* ... */</span><span class="ct-a4055a"> };</span></span><span class="line"><span class="ct-7df6f6">// contract address</span></span><span class="line"><span class="ct-92ce42">const</span><span class="ct-a4055a"> </span><span class="ct-3c8b8d">CONTRACT_ADDRESS</span><span class="ct-a4055a"> </span><span class="ct-f94398">=</span><span class="ct-a4055a"> </span><span class="ct-6fce38">'0xdea164f67df4dbfe675d5271c9d404e0260f33bb'</span><span class="ct-a4055a">;</span></span><span class="line"><span class="ct-7df6f6">// getting contract</span></span><span class="line"><span class="ct-92ce42">const</span><span class="ct-a4055a"> </span><span class="ct-3c8b8d">contract</span><span class="ct-a4055a"> </span><span class="ct-f94398">=</span><span class="ct-a4055a"> </span><span class="ct-94e6dd">getContract</span><span class="ct-a4055a">(</span><span class="ct-3c8b8d">CONTRACT_ABI</span><span class="ct-a4055a">, </span><span class="ct-3c8b8d">CONTRACT_ADDRESS</span><span class="ct-a4055a">);</span></span><span class="line"><span class="ct-7df6f6">// account's private key</span></span><span class="line"><span class="ct-92ce42">const</span><span class="ct-a4055a"> </span><span class="ct-3c8b8d">privateKey</span><span class="ct-a4055a"> </span><span class="ct-f94398">=</span><span class="ct-a4055a"> </span><span class="ct-6fce38">'...'</span><span class="ct-a4055a">;</span></span><span class="line"></span><span class="line"><span class="ct-7df6f6">// write-methods requires private key</span></span><span class="line"><span class="ct-2abfb1">const</span><span class="ct-45d7b8"> </span><span class="ct-5a0548">executeContractMethod</span><span class="ct-45d7b8"> </span><span class="ct-6edfd6">=</span><span class="ct-45d7b8"> </span><span class="ct-2abfb1">async</span><span class="ct-45d7b8"> (</span><span class="ct-3fc15e">val</span><span class="ct-6edfd6">:</span><span class="ct-45d7b8"> </span><span class="ct-d4b225">number</span><span class="ct-45d7b8">) </span><span class="ct-2abfb1">=></span><span class="ct-45d7b8"> {</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-92ce42">const</span><span class="ct-a4055a"> </span><span class="ct-3c8b8d">transaction</span><span class="ct-a4055a"> </span><span class="ct-f94398">=</span><span class="ct-a4055a"> </span><span class="ct-c5b0a7">contract</span><span class="ct-a4055a">.</span><span class="ct-c5b0a7">methods</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">store</span><span class="ct-a4055a">(</span><span class="ct-c5b0a7">val</span><span class="ct-a4055a">);</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-92ce42">const</span><span class="ct-a4055a"> </span><span class="ct-3c8b8d">account</span><span class="ct-a4055a"> </span><span class="ct-f94398">=</span><span class="ct-a4055a"> </span><span class="ct-c5b0a7">web3</span><span class="ct-a4055a">.</span><span class="ct-c5b0a7">eth</span><span class="ct-a4055a">.</span><span class="ct-c5b0a7">accounts</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">privateKeyToAccount</span><span class="ct-a4055a">(</span><span class="ct-c5b0a7">privateKey</span><span class="ct-a4055a">);</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-92ce42">const</span><span class="ct-a4055a"> </span><span class="ct-3c8b8d">options</span><span class="ct-a4055a"> </span><span class="ct-f94398">=</span><span class="ct-a4055a"> {</span></span><span class="line"><span class="ct-a4055a"> to: </span><span class="ct-3c8b8d">CONTRACT_ADDRESS</span><span class="ct-a4055a">,</span></span><span class="line"><span class="ct-a4055a"> data: </span><span class="ct-c5b0a7">transaction</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">encodeABI</span><span class="ct-a4055a">(),</span></span><span class="line"><span class="ct-a4055a"> gas: </span><span class="ct-f94398">await</span><span class="ct-a4055a"> </span><span class="ct-c5b0a7">transaction</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">estimateGas</span><span class="ct-a4055a">({ from: </span><span class="ct-c5b0a7">account</span><span class="ct-a4055a">.</span><span class="ct-c5b0a7">address</span><span class="ct-a4055a"> }),</span></span><span class="line"><span class="ct-a4055a"> gasPrice: </span><span class="ct-f94398">await</span><span class="ct-a4055a"> </span><span class="ct-c5b0a7">web3</span><span class="ct-a4055a">.</span><span class="ct-c5b0a7">eth</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">getGasPrice</span><span class="ct-a4055a">(),</span></span><span class="line"><span class="ct-a4055a"> };</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-92ce42">const</span><span class="ct-a4055a"> </span><span class="ct-3c8b8d">signed</span><span class="ct-a4055a"> </span><span class="ct-f94398">=</span><span class="ct-a4055a"> </span><span class="ct-f94398">await</span><span class="ct-a4055a"> </span><span class="ct-c5b0a7">web3</span><span class="ct-a4055a">.</span><span class="ct-c5b0a7">eth</span><span class="ct-a4055a">.</span><span class="ct-c5b0a7">accounts</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">signTransaction</span><span class="ct-a4055a">(</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-c5b0a7">options</span><span class="ct-a4055a">,</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-c5b0a7">privateKey</span><span class="ct-a4055a">,</span></span><span class="line"><span class="ct-a4055a"> );</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-f94398">await</span><span class="ct-a4055a"> </span><span class="ct-c5b0a7">web3</span><span class="ct-a4055a">.</span><span class="ct-c5b0a7">eth</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">sendSignedTransaction</span><span class="ct-a4055a">(</span><span class="ct-c5b0a7">signed</span><span class="ct-a4055a">.</span><span class="ct-c5b0a7">rawTransaction</span><span class="ct-f94398">!</span><span class="ct-a4055a">);</span></span><span class="line"><span class="ct-a4055a">};</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-a4055a"> </span><span class="ct-92ce42">const</span><span class="ct-a4055a"> </span><span class="ct-3c8b8d">requests</span><span class="ct-a4055a"> </span><span class="ct-f94398">=</span><span class="ct-a4055a"> [</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-c5b0a7">contract</span><span class="ct-a4055a">.</span><span class="ct-c5b0a7">method</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">balanceOf</span><span class="ct-a4055a">().</span><span class="ct-c5b0a7">call</span><span class="ct-a4055a">,</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-c5b0a7">contract</span><span class="ct-a4055a">.</span><span class="ct-c5b0a7">method</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">getStaked</span><span class="ct-a4055a">().</span><span class="ct-c5b0a7">call</span></span><span class="line"><span class="ct-a4055a"> ]</span></span><span class="line"></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-92ce42">const</span><span class="ct-a4055a"> </span><span class="ct-3c8b8d">result</span><span class="ct-a4055a"> </span><span class="ct-f94398">=</span><span class="ct-a4055a"> </span><span class="ct-f94398">await</span><span class="ct-a4055a"> </span><span class="ct-94e6dd">makeBatchRequest</span><span class="ct-a4055a">(</span><span class="ct-c5b0a7">request</span><span class="ct-a4055a">);</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-92ce42">const</span><span class="ct-a4055a"> </span><span class="ct-3c8b8d">web3</span><span class="ct-a4055a"> </span><span class="ct-f94398">=</span><span class="ct-a4055a"> </span><span class="ct-f94398">new</span><span class="ct-a4055a"> </span><span class="ct-94e6dd">Web3</span><span class="ct-a4055a">(</span><span class="ct-c5b0a7">Web3</span><span class="ct-a4055a">.</span><span class="ct-c5b0a7">givenProvider</span><span class="ct-a4055a"> </span><span class="ct-f94398">||</span><span class="ct-a4055a"> </span><span class="ct-3c8b8d">PROVIDER_URL</span><span class="ct-a4055a">);</span></span><span class="line"></span><span class="line"><span class="ct-2abfb1">const</span><span class="ct-45d7b8"> </span><span class="ct-5a0548">makeBatchRequest</span><span class="ct-45d7b8"> </span><span class="ct-6edfd6">=</span><span class="ct-45d7b8"> (</span><span class="ct-3fc15e">calls</span><span class="ct-6edfd6">:</span><span class="ct-45d7b8"> </span><span class="ct-d4b225">any</span><span class="ct-45d7b8">[]) </span><span class="ct-2abfb1">=></span><span class="ct-45d7b8"> {</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-f94398">try</span><span class="ct-a4055a"> {</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-92ce42">const</span><span class="ct-a4055a"> </span><span class="ct-3c8b8d">web3</span><span class="ct-a4055a"> </span><span class="ct-f94398">=</span><span class="ct-a4055a"> </span><span class="ct-94e6dd">getWeb3NoAccount</span><span class="ct-a4055a">();</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-92ce42">const</span><span class="ct-a4055a"> </span><span class="ct-3c8b8d">batch</span><span class="ct-a4055a"> </span><span class="ct-f94398">=</span><span class="ct-a4055a"> </span><span class="ct-f94398">new</span><span class="ct-a4055a"> </span><span class="ct-c5b0a7">web3</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">BatchRequest</span><span class="ct-a4055a">();</span></span><span class="line"></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-92ce42">const</span><span class="ct-a4055a"> </span><span class="ct-3c8b8d">promises</span><span class="ct-a4055a"> </span><span class="ct-f94398">=</span><span class="ct-a4055a"> </span><span class="ct-c5b0a7">calls</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">map</span><span class="ct-92ce42">=></span><span class="ct-a4055a"> {</span></span><span class="line"><span class="ct-45d7b8"> </span><span class="ct-6edfd6">return</span><span class="ct-45d7b8"> </span><span class="ct-6edfd6">new</span><span class="ct-45d7b8"> </span><span class="ct-d4b225">Promise</span><span class="ct-45d7b8">((</span><span class="ct-3fc15e">resolve</span><span class="ct-45d7b8">, </span><span class="ct-3fc15e">reject</span><span class="ct-45d7b8">) </span><span class="ct-2abfb1">=></span><span class="ct-45d7b8"> {</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-c5b0a7">batch</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">add</span><span class="ct-a4055a">(</span></span><span class="line"></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-f94398">if</span><span class="ct-a4055a"> (</span><span class="ct-c5b0a7">err</span><span class="ct-a4055a">) {</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-94e6dd">reject</span><span class="ct-a4055a">(</span><span class="ct-c5b0a7">err</span><span class="ct-a4055a">);</span></span><span class="line"><span class="ct-a4055a"> } </span><span class="ct-f94398">else</span><span class="ct-a4055a"> {</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-94e6dd">resolve</span><span class="ct-a4055a">(</span><span class="ct-c5b0a7">result</span><span class="ct-a4055a">);</span></span><span class="line"><span class="ct-a4055a"> }</span></span><span class="line"><span class="ct-a4055a"> })</span></span><span class="line"><span class="ct-a4055a"> );</span></span><span class="line"><span class="ct-a4055a"> });</span></span><span class="line"><span class="ct-a4055a"> });</span></span><span class="line"></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-c5b0a7">batch</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">execute</span><span class="ct-a4055a">();</span></span><span class="line"></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-f94398">return</span><span class="ct-a4055a"> </span><span class="ct-dfea04">Promise</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">all</span><span class="ct-a4055a">(</span><span class="ct-c5b0a7">promises</span><span class="ct-a4055a">);</span></span><span class="line"><span class="ct-a4055a"> } </span><span class="ct-f94398">catch</span><span class="ct-a4055a"> {</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-f94398">return</span><span class="ct-a4055a"> </span><span class="ct-01cf1c">null</span><span class="ct-a4055a">;</span></span><span class="line"><span class="ct-a4055a"> }</span></span><span class="line"><span class="ct-a4055a">};</span></span><span class="line"></span><span class="line"><span class="ct-f94398">export</span><span class="ct-9cf48c"> </span><span class="ct-f94398">default</span><span class="ct-9cf48c"> </span><span class="ct-c5b0a7">makeBatchRequest</span><span class="ct-a4055a">;</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-a4055a"> </span><span class="ct-f94398">import</span><span class="ct-a4055a"> </span><span class="ct-c5b0a7">Web3</span><span class="ct-a4055a"> </span><span class="ct-f94398">from</span><span class="ct-a4055a"> </span><span class="ct-6fce38">'web3'</span><span class="ct-a4055a">;</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-92ce42">const</span><span class="ct-a4055a"> </span><span class="ct-3c8b8d">web3</span><span class="ct-a4055a"> </span><span class="ct-f94398">=</span><span class="ct-a4055a"> </span><span class="ct-f94398">new</span><span class="ct-a4055a"> </span><span class="ct-94e6dd">Web3</span><span class="ct-a4055a">(</span><span class="ct-6fce38">'YOUR_RPC_ENDPOINT_HERE'</span><span class="ct-a4055a">);</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-92ce42">const</span><span class="ct-a4055a"> </span><span class="ct-3c8b8d">ABI</span><span class="ct-a4055a"> </span><span class="ct-f94398">=</span><span class="ct-a4055a"> </span><span class="ct-6fce38">'YOUR ABI HERE'</span><span class="ct-a4055a">;</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-92ce42">const</span><span class="ct-a4055a"> </span><span class="ct-3c8b8d">CONTRACT_ADDRESS</span><span class="ct-a4055a"> </span><span class="ct-f94398">=</span><span class="ct-a4055a"> </span><span class="ct-6fce38">'YOUR CONTRACT ADDRESS HERE'</span><span class="ct-a4055a">;</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-92ce42">const</span><span class="ct-a4055a"> </span><span class="ct-3c8b8d">myContract</span><span class="ct-a4055a"> </span><span class="ct-f94398">=</span><span class="ct-a4055a"> </span><span class="ct-f94398">new</span><span class="ct-a4055a"> </span><span class="ct-c5b0a7">Web3</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">Contract</span><span class="ct-a4055a">(</span><span class="ct-3c8b8d">ABI</span><span class="ct-a4055a">, </span><span class="ct-3c8b8d">CONTRACT_ADDRESS</span><span class="ct-a4055a">);</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-c5b0a7">referralProgramContract</span><span class="ct-a4055a">.</span><span class="ct-c5b0a7">events</span></span><span class="line"><span class="ct-a4055a"> .</span><span class="ct-94e6dd">RegisterUser</span><span class="ct-a4055a">()</span></span><span class="line"><span class="ct-45d7b8"> .</span><span class="ct-5a0548">on</span><span class="ct-45d7b8">(</span><span class="ct-d733ae">'connected'</span><span class="ct-45d7b8">, (</span><span class="ct-3fc15e">subscriptionId</span><span class="ct-6edfd6">:</span><span class="ct-45d7b8"> </span><span class="ct-d4b225">string</span><span class="ct-45d7b8">) </span><span class="ct-2abfb1">=></span><span class="ct-45d7b8"> {</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-c5b0a7">console</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">log</span><span class="ct-a4055a">(</span><span class="ct-6fce38">`| UserRegistered | events | ${</span><span class="ct-c5b0a7">subscriptionId</span><span class="ct-6fce38">}`</span><span class="ct-a4055a">);</span></span><span class="line"><span class="ct-a4055a"> })</span></span><span class="line"><span class="ct-a4055a"> .</span><span class="ct-94e6dd">on</span><span class="ct-a4055a">(</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-6fce38">'data'</span><span class="ct-a4055a">,</span></span><span class="line"><span class="ct-45d7b8"> </span><span class="ct-2abfb1">async</span><span class="ct-45d7b8"> (</span><span class="ct-3fc15e">event</span><span class="ct-6edfd6">:</span><span class="ct-45d7b8"> {</span></span><span class="line"><span class="ct-45d7b8"> </span><span class="ct-3fc15e">removed</span><span class="ct-6edfd6">:</span><span class="ct-45d7b8"> </span><span class="ct-d4b225">boolean</span><span class="ct-45d7b8">;</span></span><span class="line"><span class="ct-45d7b8"> </span><span class="ct-3fc15e">returnValues</span><span class="ct-6edfd6">:</span><span class="ct-45d7b8"> </span><span class="ct-32818f">RegisterUserResponseInterface</span><span class="ct-45d7b8">;</span></span><span class="line"><span class="ct-a4055a"> }) </span><span class="ct-92ce42">=></span><span class="ct-a4055a"> {</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-f94398">try</span><span class="ct-a4055a"> {</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-f94398">if</span><span class="ct-a4055a"> (</span><span class="ct-c5b0a7">event</span><span class="ct-a4055a">.</span><span class="ct-c5b0a7">removed</span><span class="ct-a4055a">) {</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-f94398">return</span><span class="ct-a4055a">;</span></span><span class="line"><span class="ct-a4055a"> }</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-92ce42">const</span><span class="ct-a4055a"> { </span><span class="ct-3c8b8d">user</span><span class="ct-a4055a">, </span><span class="ct-3c8b8d">referrer</span><span class="ct-a4055a"> } </span><span class="ct-f94398">=</span><span class="ct-a4055a"> </span><span class="ct-c5b0a7">event</span><span class="ct-a4055a">.</span><span class="ct-c5b0a7">returnValues</span><span class="ct-a4055a">;</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-c5b0a7">console</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">log</span><span class="ct-a4055a">(</span><span class="ct-c5b0a7">user</span><span class="ct-a4055a">, </span><span class="ct-c5b0a7">referrer</span><span class="ct-a4055a">);</span></span><span class="line"><span class="ct-a4055a"> } </span><span class="ct-f94398">catch</span><span class="ct-a4055a"> (</span><span class="ct-c5b0a7">e</span><span class="ct-a4055a">) {</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-c5b0a7">console</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">log</span><span class="ct-a4055a">(</span><span class="ct-6fce38">`| ONCE | ${</span><span class="ct-c5b0a7">e</span><span class="ct-6fce38">}`</span><span class="ct-a4055a">);</span></span><span class="line"><span class="ct-a4055a"> }</span></span><span class="line"><span class="ct-a4055a"> },</span></span><span class="line"><span class="ct-a4055a"> )</span></span><span class="line"><span class="ct-45d7b8"> .</span><span class="ct-5a0548">on</span><span class="ct-45d7b8">(</span><span class="ct-d733ae">'error'</span><span class="ct-45d7b8">, (</span><span class="ct-3fc15e">error</span><span class="ct-6edfd6">:</span><span class="ct-45d7b8"> </span><span class="ct-32818f">ErrnoException</span><span class="ct-45d7b8">) </span><span class="ct-2abfb1">=></span><span class="ct-45d7b8"> {</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-c5b0a7">console</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">log</span><span class="ct-a4055a">(</span><span class="ct-c5b0a7">error</span><span class="ct-a4055a">);</span></span><span class="line"><span class="ct-a4055a"> });</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-a4055a"> </span><span class="ct-92ce42">let</span><span class="ct-a4055a"> </span><span class="ct-c5b0a7">options</span><span class="ct-a4055a"> </span><span class="ct-f94398">=</span><span class="ct-a4055a"> {</span></span><span class="line"><span class="ct-a4055a"> filter: {</span></span><span class="line"><span class="ct-a4055a"> value: [],</span></span><span class="line"><span class="ct-a4055a"> },</span></span><span class="line"><span class="ct-a4055a"> fromBlock: </span><span class="ct-a0d1f4">0</span></span><span class="line"><span class="ct-a4055a"> };</span></span><span class="line"></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-c5b0a7">myContract</span><span class="ct-a4055a">.</span><span class="ct-c5b0a7">events</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">Transfer</span><span class="ct-a4055a">(</span><span class="ct-c5b0a7">options</span><span class="ct-a4055a">)</span></span><span class="line"><span class="ct-a4055a"> .</span><span class="ct-94e6dd">on</span><span class="ct-a4055a">(</span><span class="ct-6fce38">'data'</span><span class="ct-a4055a"> </span><span class="ct-94e6dd">log</span><span class="ct-a4055a">(</span><span class="ct-c5b0a7">event</span><span class="ct-a4055a">))</span></span><span class="line"><span class="ct-a4055a"> .</span><span class="ct-94e6dd">on</span><span class="ct-a4055a">(</span><span class="ct-6fce38">'changed'</span><span class="ct-a4055a"> </span><span class="ct-94e6dd">log</span><span class="ct-a4055a">(</span><span class="ct-c5b0a7">changed</span><span class="ct-a4055a">))</span></span><span class="line"><span class="ct-a4055a"> .</span><span class="ct-94e6dd">on</span><span class="ct-a4055a">(</span><span class="ct-6fce38">'error'</span><span class="ct-a4055a"> </span></span><span class="line"><span class="ct-a4055a"> .</span><span class="ct-94e6dd">on</span><span class="ct-a4055a">(</span><span class="ct-6fce38">'connected'</span><span class="ct-a4055a"> </span><span class="ct-94e6dd">log</span><span class="ct-a4055a">(</span><span class="ct-c5b0a7">str</span><span class="ct-a4055a">))</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-a4055a"> </span><span class="ct-92ce42">let</span><span class="ct-a4055a"> </span><span class="ct-c5b0a7">options</span><span class="ct-a4055a"> </span><span class="ct-f94398">=</span><span class="ct-a4055a"> {</span></span><span class="line"><span class="ct-a4055a"> fromBlock: </span><span class="ct-a0d1f4">0</span><span class="ct-a4055a">,</span></span><span class="line"><span class="ct-a4055a"> address: [</span><span class="ct-6fce38">'address-1'</span><span class="ct-a4055a">, </span><span class="ct-6fce38">'address-2'</span><span class="ct-a4055a">], </span><span class="ct-7df6f6">//Only get events from specific addresses</span></span><span class="line"><span class="ct-a4055a"> topics: [] </span><span class="ct-7df6f6">//What topics to subscribe to</span></span><span class="line"><span class="ct-a4055a"> };</span></span><span class="line"></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-92ce42">let</span><span class="ct-a4055a"> </span><span class="ct-c5b0a7">subscription</span><span class="ct-a4055a"> </span><span class="ct-f94398">=</span><span class="ct-a4055a"> (</span><span class="ct-6fce38">'logs'</span><span class="ct-a4055a">, </span><span class="ct-c5b0a7">options</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-f94398">if</span><span class="ct-a4055a"> (</span><span class="ct-f94398">!</span><span class="ct-c5b0a7">err</span><span class="ct-a4055a">)</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-c5b0a7">console</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">log</span><span class="ct-a4055a">(</span><span class="ct-c5b0a7">event</span><span class="ct-a4055a">)</span></span><span class="line"><span class="ct-a4055a"> });</span></span><span class="line"></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-c5b0a7">subscription</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">on</span><span class="ct-a4055a">(</span><span class="ct-6fce38">'data'</span><span class="ct-92ce42">=></span><span class="ct-a4055a"> </span><span class="ct-c5b0a7">console</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">log</span><span class="ct-a4055a">(</span><span class="ct-c5b0a7">event</span><span class="ct-a4055a">))</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-c5b0a7">subscription</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">on</span><span class="ct-a4055a">(</span><span class="ct-6fce38">'changed'</span><span class="ct-92ce42">=></span><span class="ct-a4055a"> </span><span class="ct-c5b0a7">console</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">log</span><span class="ct-a4055a">(</span><span class="ct-c5b0a7">changed</span><span class="ct-a4055a">))</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-c5b0a7">subscription</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">on</span><span class="ct-a4055a">(</span><span class="ct-6fce38">'error'</span><span class="ct-92ce42">=></span><span class="ct-a4055a"> { </span><span class="ct-f94398">throw</span><span class="ct-a4055a"> </span><span class="ct-c5b0a7">err</span><span class="ct-a4055a"> })</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-c5b0a7">subscription</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">on</span><span class="ct-a4055a">(</span><span class="ct-6fce38">'connected'</span><span class="ct-92ce42">=></span><span class="ct-a4055a"> </span><span class="ct-c5b0a7">console</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">log</span><span class="ct-a4055a">(</span><span class="ct-c5b0a7">nr</span><span class="ct-a4055a">))</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-a4055a"> </span><span class="ct-7df6f6">//example options(optional)</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-92ce42">let</span><span class="ct-a4055a"> </span><span class="ct-c5b0a7">options</span><span class="ct-a4055a"> </span><span class="ct-f94398">=</span><span class="ct-a4055a"> {</span></span><span class="line"><span class="ct-a4055a"> filter: {</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-7df6f6">// only get events where transfer value was 1000 or 1337</span></span><span class="line"><span class="ct-a4055a"> value: [</span><span class="ct-6fce38">'1000'</span><span class="ct-a4055a">, </span><span class="ct-6fce38">'1337'</span><span class="ct-a4055a">] </span></span><span class="line"><span class="ct-a4055a"> },</span></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-7df6f6">// number | "earliest" | "pending" | "latest"</span></span><span class="line"><span class="ct-a4055a"> fromBlock: </span><span class="ct-a0d1f4">0</span><span class="ct-a4055a">, </span></span><span class="line"><span class="ct-a4055a"> toBlock: </span><span class="ct-6fce38">'latest'</span></span><span class="line"><span class="ct-a4055a"> };</span></span><span class="line"></span><span class="line"><span class="ct-a4055a"> </span><span class="ct-c5b0a7">myContract</span><span class="ct-a4055a">.</span><span class="ct-94e6dd">getPastEvents</span><span class="ct-a4055a">(</span><span class="ct-6fce38">'Transfer'</span><span class="ct-a4055a">, </span><span class="ct-c5b0a7">options</span><span class="ct-a4055a">)</span></span><span class="line"><span class="ct-a4055a"> .</span><span class="ct-94e6dd">then</span><span class="ct-a4055a"> </span><span class="ct-94e6dd">log</span><span class="ct-a4055a">(</span><span class="ct-c5b0a7">results</span><span class="ct-a4055a">))</span></span><span class="line"><span class="ct-a4055a"> .</span><span class="ct-94e6dd">catch</span><span class="ct-a4055a"> </span></span></code></pre><!--]--></div><style>.ct-32818f{color:#FFA657}.ct-d733ae{color:#A5D6FF}.ct-01cf1c{color:#79C0FF}.ct-dfea04{color:#79C0FF}.ct-a0d1f4{color:#79C0FF}.ct-3c8b8d{color:#79C0FF}.ct-92ce42{color:#FF7B72}.ct-7df6f6{color:#8B949E}.ct-9cf48c{color:#FFA657}.ct-94e6dd{color:#D2A8FF}.ct-088577{color:#79C0FF}.ct-0060f1{color:#79C0FF}.ct-d4b225{color:#79C0FF}.ct-3fc15e{color:#FFA657}.ct-6edfd6{color:#FF7B72}.ct-5a0548{color:#D2A8FF}.ct-45d7b8{color:#C9D1D9}.ct-2abfb1{color:#FF7B72}.ct-6fce38{color:#A5D6FF}.ct-c5b0a7{color:#C9D1D9}.ct-a4055a{color:#C9D1D9}.ct-f94398{color:#FF7B72}.light .ct-f94398{color:#859900}.light .ct-a4055a{color:#657B83}.light .ct-c5b0a7{color:#268BD2}.light .ct-6fce38{color:#2AA198}.light .ct-2abfb1{color:#073642}.light .ct-45d7b8{color:#657B83}.light .ct-5a0548{color:#268BD2}.light .ct-6edfd6{color:#859900}.light .ct-3fc15e{color:#657B83}.light .ct-d4b225{color:#859900}.light .ct-0060f1{color:#268BD2}.light .ct-088577{color:#657B83}.light .ct-94e6dd{color:#268BD2}.light .ct-9cf48c{color:#657B83}.light .ct-7df6f6{color:#93A1A1}.light .ct-92ce42{color:#073642}.light .ct-3c8b8d{color:#268BD2}.light .ct-a0d1f4{color:#D33682}.light .ct-dfea04{color:#859900}.light .ct-01cf1c{color:#B58900}.light .ct-d733ae{color:#2AA198}.light .ct-32818f{color:#268BD2}</style></div></article><!--]--></main><!--]--><!--]--></div><footer class="_footer_ogxvf_1 _footer_vom09_18 _footer_vom09_18"><div>btw, have a nice day</div><div class="_filler_ogxvf_9"></div><div> (2018 - 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