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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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class="_children_192pu_86"><!--[--><div class="_row_192pu_24"><a href="/typescript/add-global-variable-to-window" class="_link_192pu_66">Add Global Variable To Window</a></div><div class="_row_192pu_24"><a href="/typescript/flatten-object-with-periods" class="_link_192pu_66">Flatten Object With Periods</a></div><div class="_row_192pu_24"><a href="/typescript/type-guards" class="_link_192pu_66">Type 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-15da92">import</span><span class="ct-3a0a46"> { </span><span class="ct-b1f167">Contract</span><span class="ct-3a0a46"> } </span><span class="ct-15da92">from</span><span class="ct-3a0a46"> </span><span class="ct-1598b9">'web3-eth-contract'</span><span class="ct-3a0a46">;</span></span><span class="line"><span class="ct-15da92">import</span><span class="ct-3a0a46"> { </span><span class="ct-b1f167">web3</span><span class="ct-3a0a46"> } </span><span class="ct-15da92">from</span><span class="ct-3a0a46"> </span><span class="ct-1598b9">'.'</span><span class="ct-3a0a46">;</span></span><span class="line"></span><span class="line"><span class="ct-a239ee">const</span><span class="ct-b9683c"> </span><span class="ct-959bef">getContract</span><span class="ct-b9683c"> </span><span class="ct-ccd62f">=</span><span class="ct-b9683c"> (</span><span class="ct-89a961">abi</span><span class="ct-ccd62f">:</span><span class="ct-b9683c"> </span><span class="ct-101fd8">object</span><span class="ct-b9683c">, </span><span class="ct-89a961">address</span><span class="ct-ccd62f">?:</span><span class="ct-b9683c"> </span><span class="ct-101fd8">string</span><span class="ct-b9683c">)</span><span class="ct-ccd62f">:</span><span class="ct-b9683c"> </span><span class="ct-a239ee">=></span><span class="ct-b9683c"> {</span></span><span class="line"><span class="ct-b9683c"> </span><span class="ct-a239ee">const</span><span class="ct-b9683c"> </span><span class="ct-a828c2">abiFromJson</span><span class="ct-b9683c"> </span><span class="ct-ccd62f">=</span><span class="ct-b9683c"> </span><span class="ct-184ca3">JSON</span><span class="ct-b9683c">.</span><span class="ct-a828c2">parse</span><span class="ct-b9683c">(</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-15da92">return</span><span class="ct-3a0a46"> </span><span class="ct-15da92">new</span><span class="ct-3a0a46"> </span><span class="ct-b1f167">web3</span><span class="ct-3a0a46">.</span><span class="ct-b1f167">eth</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">Contract</span><span class="ct-3a0a46">(</span><span class="ct-b1f167">abiFromJson</span><span class="ct-3a0a46">, </span><span class="ct-b1f167">address</span><span class="ct-3a0a46">);</span></span><span class="line"><span class="ct-3a0a46">};</span></span><span class="line"></span><span class="line"><span class="ct-15da92">export</span><span class="ct-388bfd"> </span><span class="ct-15da92">default</span><span class="ct-388bfd"> </span><span class="ct-b1f167">getContract</span><span class="ct-3a0a46">;</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-cb060a">// see example below</span></span><span class="line"><span class="ct-15da92">import</span><span class="ct-3a0a46"> { </span><span class="ct-b1f167">getContract</span><span class="ct-3a0a46"> } </span><span class="ct-15da92">from</span><span class="ct-3a0a46"> </span><span class="ct-1598b9">'.'</span><span class="ct-3a0a46">;</span></span><span class="line"></span><span class="line"><span class="ct-cb060a">// ABI of contract</span></span><span class="line"><span class="ct-a306a2">const</span><span class="ct-3a0a46"> </span><span class="ct-1a19ee">CONTRACT_ABI</span><span class="ct-3a0a46"> </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> { </span><span class="ct-cb060a">/* ... */</span><span class="ct-3a0a46"> };</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-cb060a">// address for contract</span></span><span class="line"><span class="ct-a306a2">const</span><span class="ct-3a0a46"> </span><span class="ct-1a19ee">CONTRACT_ADDRESS</span><span class="ct-3a0a46"> </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> </span><span class="ct-1598b9">'0xdea164f67df4dbfe675d5271c9d404e0260f33bb'</span><span class="ct-3a0a46">;</span></span><span class="line"></span><span class="line"><span class="ct-15da92">export</span><span class="ct-3a0a46"> </span><span class="ct-a306a2">const</span><span class="ct-3a0a46"> </span><span class="ct-f0fcfa">executeContractMethod</span><span class="ct-3a0a46"> </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> </span><span class="ct-a306a2">async</span><span class="ct-3a0a46"> ({}) </span><span class="ct-a306a2">=></span><span class="ct-3a0a46"> {</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-cb060a">// getting contract</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-a306a2">const</span><span class="ct-3a0a46"> </span><span class="ct-1a19ee">contract</span><span class="ct-3a0a46"> </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> </span><span class="ct-f0fcfa">getContract</span><span class="ct-3a0a46">(</span><span class="ct-1a19ee">CONTRACT_ABI</span><span class="ct-3a0a46">, </span><span class="ct-1a19ee">CONTRACT_ADDRESS</span><span class="ct-3a0a46">);</span></span><span class="line"><span class="ct-3a0a46"> </span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-cb060a">// Calling write method</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-15da92">try</span><span class="ct-3a0a46"> {</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-cb060a">// authorizing with Metamask</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-15da92">await</span><span class="ct-3a0a46"> </span><span class="ct-b1f167">web3</span><span class="ct-3a0a46">.</span><span class="ct-b1f167">currentProvider</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">request</span><span class="ct-3a0a46">({ method: </span><span class="ct-1598b9">'eth_requestAccounts'</span><span class="ct-3a0a46"> });</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-cb060a">// getting wallet address</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-a306a2">const</span><span class="ct-3a0a46"> </span><span class="ct-1a19ee">addressUser</span><span class="ct-3a0a46"> </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> </span><span class="ct-b1f167">web3</span><span class="ct-3a0a46">.</span><span class="ct-b1f167">currentProvider</span><span class="ct-3a0a46">.</span><span class="ct-b1f167">selectedAddress</span><span class="ct-3a0a46">;</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-cb060a">// calling "store" store method for contract</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-cb060a">// payload should include `from` address, that matches</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-cb060a">// current user's wallet</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-15da92">await</span><span class="ct-3a0a46"> </span><span class="ct-b1f167">contract</span><span class="ct-3a0a46">.</span><span class="ct-b1f167">methods</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">store</span><span class="ct-3a0a46">(</span><span class="ct-f87b40">0</span><span class="ct-3a0a46">, </span><span class="ct-1598b9">'Parameter'</span><span class="ct-3a0a46">).</span><span class="ct-f0fcfa">send</span><span class="ct-3a0a46">({</span></span><span class="line"><span class="ct-3a0a46"> from: </span><span class="ct-b1f167">addressUser</span><span class="ct-3a0a46">,</span></span><span class="line"><span class="ct-3a0a46"> });</span></span><span class="line"><span class="ct-3a0a46"> } </span><span class="ct-15da92">catch</span><span class="ct-3a0a46"> (</span><span class="ct-b1f167">e</span><span class="ct-3a0a46">) {</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-15da92">throw</span><span class="ct-3a0a46"> </span><span class="ct-15da92">new</span><span class="ct-3a0a46"> </span><span class="ct-7d3a0f">Error</span><span class="ct-3a0a46">(</span><span class="ct-b1f167">e</span><span class="ct-3a0a46">);</span></span><span class="line"><span class="ct-3a0a46"> }</span></span><span class="line"><span class="ct-3a0a46"> </span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-cb060a">// calling read method</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-15da92">try</span><span class="ct-3a0a46"> {</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-cb060a">// this method can return data</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-a306a2">const</span><span class="ct-3a0a46"> </span><span class="ct-1a19ee">result</span><span class="ct-3a0a46"> </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> </span><span class="ct-15da92">await</span><span class="ct-3a0a46"> </span><span class="ct-b1f167">contract</span><span class="ct-3a0a46">.</span><span class="ct-b1f167">methods</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">retrieve</span><span class="ct-3a0a46">().</span><span class="ct-f0fcfa">call</span><span class="ct-3a0a46">();</span></span><span class="line"><span class="ct-3a0a46"> } </span><span class="ct-15da92">catch</span><span class="ct-3a0a46"> (</span><span class="ct-b1f167">e</span><span class="ct-3a0a46">) {</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-15da92">throw</span><span class="ct-3a0a46"> </span><span class="ct-15da92">new</span><span class="ct-3a0a46"> </span><span class="ct-7d3a0f">Error</span><span class="ct-3a0a46">(</span><span class="ct-b1f167">e</span><span class="ct-3a0a46">);</span></span><span class="line"><span class="ct-3a0a46"> }</span></span><span class="line"><span class="ct-3a0a46">}</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-cb060a">// see example below</span></span><span class="line"><span class="ct-15da92">import</span><span class="ct-3a0a46"> { </span><span class="ct-b1f167">getContract</span><span class="ct-3a0a46"> } </span><span class="ct-15da92">from</span><span class="ct-3a0a46"> </span><span class="ct-1598b9">'.'</span><span class="ct-3a0a46">;</span></span><span class="line"></span><span class="line"><span class="ct-cb060a">// ABI контракта</span></span><span class="line"><span class="ct-a306a2">const</span><span class="ct-3a0a46"> </span><span class="ct-1a19ee">CONTRACT_ABI</span><span class="ct-3a0a46"> </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> { </span><span class="ct-cb060a">/* ... */</span><span class="ct-3a0a46"> };</span></span><span class="line"><span class="ct-cb060a">// contract address</span></span><span class="line"><span class="ct-a306a2">const</span><span class="ct-3a0a46"> </span><span class="ct-1a19ee">CONTRACT_ADDRESS</span><span class="ct-3a0a46"> </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> </span><span class="ct-1598b9">'0xdea164f67df4dbfe675d5271c9d404e0260f33bb'</span><span class="ct-3a0a46">;</span></span><span class="line"><span class="ct-cb060a">// getting contract</span></span><span class="line"><span class="ct-a306a2">const</span><span class="ct-3a0a46"> </span><span class="ct-1a19ee">contract</span><span class="ct-3a0a46"> </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> </span><span class="ct-f0fcfa">getContract</span><span class="ct-3a0a46">(</span><span class="ct-1a19ee">CONTRACT_ABI</span><span class="ct-3a0a46">, </span><span class="ct-1a19ee">CONTRACT_ADDRESS</span><span class="ct-3a0a46">);</span></span><span class="line"><span class="ct-cb060a">// account's private key</span></span><span class="line"><span class="ct-a306a2">const</span><span class="ct-3a0a46"> </span><span class="ct-1a19ee">privateKey</span><span class="ct-3a0a46"> </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> </span><span class="ct-1598b9">'...'</span><span class="ct-3a0a46">;</span></span><span class="line"></span><span class="line"><span class="ct-cb060a">// write-methods requires private key</span></span><span class="line"><span class="ct-a239ee">const</span><span class="ct-b9683c"> </span><span class="ct-959bef">executeContractMethod</span><span class="ct-b9683c"> </span><span class="ct-ccd62f">=</span><span class="ct-b9683c"> </span><span class="ct-a239ee">async</span><span class="ct-b9683c"> (</span><span class="ct-89a961">val</span><span class="ct-ccd62f">:</span><span class="ct-b9683c"> </span><span class="ct-101fd8">number</span><span class="ct-b9683c">) </span><span class="ct-a239ee">=></span><span class="ct-b9683c"> {</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-a306a2">const</span><span class="ct-3a0a46"> </span><span class="ct-1a19ee">transaction</span><span class="ct-3a0a46"> </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> </span><span class="ct-b1f167">contract</span><span class="ct-3a0a46">.</span><span class="ct-b1f167">methods</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">store</span><span class="ct-3a0a46">(</span><span class="ct-b1f167">val</span><span class="ct-3a0a46">);</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-a306a2">const</span><span class="ct-3a0a46"> </span><span class="ct-1a19ee">account</span><span class="ct-3a0a46"> </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> </span><span class="ct-b1f167">web3</span><span class="ct-3a0a46">.</span><span class="ct-b1f167">eth</span><span class="ct-3a0a46">.</span><span class="ct-b1f167">accounts</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">privateKeyToAccount</span><span class="ct-3a0a46">(</span><span class="ct-b1f167">privateKey</span><span class="ct-3a0a46">);</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-a306a2">const</span><span class="ct-3a0a46"> </span><span class="ct-1a19ee">options</span><span class="ct-3a0a46"> </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> {</span></span><span class="line"><span class="ct-3a0a46"> to: </span><span class="ct-1a19ee">CONTRACT_ADDRESS</span><span class="ct-3a0a46">,</span></span><span class="line"><span class="ct-3a0a46"> data: </span><span class="ct-b1f167">transaction</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">encodeABI</span><span class="ct-3a0a46">(),</span></span><span class="line"><span class="ct-3a0a46"> gas: </span><span class="ct-15da92">await</span><span class="ct-3a0a46"> </span><span class="ct-b1f167">transaction</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">estimateGas</span><span class="ct-3a0a46">({ from: </span><span class="ct-b1f167">account</span><span class="ct-3a0a46">.</span><span class="ct-b1f167">address</span><span class="ct-3a0a46"> }),</span></span><span class="line"><span class="ct-3a0a46"> gasPrice: </span><span class="ct-15da92">await</span><span class="ct-3a0a46"> </span><span class="ct-b1f167">web3</span><span class="ct-3a0a46">.</span><span class="ct-b1f167">eth</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">getGasPrice</span><span class="ct-3a0a46">(),</span></span><span class="line"><span class="ct-3a0a46"> };</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-a306a2">const</span><span class="ct-3a0a46"> </span><span class="ct-1a19ee">signed</span><span class="ct-3a0a46"> </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> </span><span class="ct-15da92">await</span><span class="ct-3a0a46"> </span><span class="ct-b1f167">web3</span><span class="ct-3a0a46">.</span><span class="ct-b1f167">eth</span><span class="ct-3a0a46">.</span><span class="ct-b1f167">accounts</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">signTransaction</span><span class="ct-3a0a46">(</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-b1f167">options</span><span class="ct-3a0a46">,</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-b1f167">privateKey</span><span class="ct-3a0a46">,</span></span><span class="line"><span class="ct-3a0a46"> );</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-15da92">await</span><span class="ct-3a0a46"> </span><span class="ct-b1f167">web3</span><span class="ct-3a0a46">.</span><span class="ct-b1f167">eth</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">sendSignedTransaction</span><span class="ct-3a0a46">(</span><span class="ct-b1f167">signed</span><span class="ct-3a0a46">.</span><span class="ct-b1f167">rawTransaction</span><span class="ct-15da92">!</span><span class="ct-3a0a46">);</span></span><span class="line"><span class="ct-3a0a46">};</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-3a0a46"> </span><span class="ct-a306a2">const</span><span class="ct-3a0a46"> </span><span class="ct-1a19ee">requests</span><span class="ct-3a0a46"> </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> [</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-b1f167">contract</span><span class="ct-3a0a46">.</span><span class="ct-b1f167">method</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">balanceOf</span><span class="ct-3a0a46">().</span><span class="ct-b1f167">call</span><span class="ct-3a0a46">,</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-b1f167">contract</span><span class="ct-3a0a46">.</span><span class="ct-b1f167">method</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">getStaked</span><span class="ct-3a0a46">().</span><span class="ct-b1f167">call</span></span><span class="line"><span class="ct-3a0a46"> ]</span></span><span class="line"></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-a306a2">const</span><span class="ct-3a0a46"> </span><span class="ct-1a19ee">result</span><span class="ct-3a0a46"> </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> </span><span class="ct-15da92">await</span><span class="ct-3a0a46"> </span><span class="ct-f0fcfa">makeBatchRequest</span><span class="ct-3a0a46">(</span><span class="ct-b1f167">request</span><span class="ct-3a0a46">);</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-a306a2">const</span><span class="ct-3a0a46"> </span><span class="ct-1a19ee">web3</span><span class="ct-3a0a46"> </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> </span><span class="ct-15da92">new</span><span class="ct-3a0a46"> </span><span class="ct-f0fcfa">Web3</span><span class="ct-3a0a46">(</span><span class="ct-b1f167">Web3</span><span class="ct-3a0a46">.</span><span class="ct-b1f167">givenProvider</span><span class="ct-3a0a46"> </span><span class="ct-15da92">||</span><span class="ct-3a0a46"> </span><span class="ct-1a19ee">PROVIDER_URL</span><span class="ct-3a0a46">);</span></span><span class="line"></span><span class="line"><span class="ct-a239ee">const</span><span class="ct-b9683c"> </span><span class="ct-959bef">makeBatchRequest</span><span class="ct-b9683c"> </span><span class="ct-ccd62f">=</span><span class="ct-b9683c"> (</span><span class="ct-89a961">calls</span><span class="ct-ccd62f">:</span><span class="ct-b9683c"> </span><span class="ct-101fd8">any</span><span class="ct-b9683c">[]) </span><span class="ct-a239ee">=></span><span class="ct-b9683c"> {</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-15da92">try</span><span class="ct-3a0a46"> {</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-a306a2">const</span><span class="ct-3a0a46"> </span><span class="ct-1a19ee">web3</span><span class="ct-3a0a46"> </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> </span><span class="ct-f0fcfa">getWeb3NoAccount</span><span class="ct-3a0a46">();</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-a306a2">const</span><span class="ct-3a0a46"> </span><span class="ct-1a19ee">batch</span><span class="ct-3a0a46"> </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> </span><span class="ct-15da92">new</span><span class="ct-3a0a46"> </span><span class="ct-b1f167">web3</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">BatchRequest</span><span class="ct-3a0a46">();</span></span><span class="line"></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-a306a2">const</span><span class="ct-3a0a46"> </span><span class="ct-1a19ee">promises</span><span class="ct-3a0a46"> </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> </span><span class="ct-b1f167">calls</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">map</span><span class="ct-a306a2">=></span><span class="ct-3a0a46"> {</span></span><span class="line"><span class="ct-b9683c"> </span><span class="ct-ccd62f">return</span><span class="ct-b9683c"> </span><span class="ct-ccd62f">new</span><span class="ct-b9683c"> </span><span class="ct-101fd8">Promise</span><span class="ct-b9683c">((</span><span class="ct-89a961">resolve</span><span class="ct-b9683c">, </span><span class="ct-89a961">reject</span><span class="ct-b9683c">) </span><span class="ct-a239ee">=></span><span class="ct-b9683c"> {</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-b1f167">batch</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">add</span><span class="ct-3a0a46">(</span></span><span class="line"></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-15da92">if</span><span class="ct-3a0a46"> (</span><span class="ct-b1f167">err</span><span class="ct-3a0a46">) {</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-f0fcfa">reject</span><span class="ct-3a0a46">(</span><span class="ct-b1f167">err</span><span class="ct-3a0a46">);</span></span><span class="line"><span class="ct-3a0a46"> } </span><span class="ct-15da92">else</span><span class="ct-3a0a46"> {</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-f0fcfa">resolve</span><span class="ct-3a0a46">(</span><span class="ct-b1f167">result</span><span class="ct-3a0a46">);</span></span><span class="line"><span class="ct-3a0a46"> }</span></span><span class="line"><span class="ct-3a0a46"> })</span></span><span class="line"><span class="ct-3a0a46"> );</span></span><span class="line"><span class="ct-3a0a46"> });</span></span><span class="line"><span class="ct-3a0a46"> });</span></span><span class="line"></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-b1f167">batch</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">execute</span><span class="ct-3a0a46">();</span></span><span class="line"></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-15da92">return</span><span class="ct-3a0a46"> </span><span class="ct-7d3a0f">Promise</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">all</span><span class="ct-3a0a46">(</span><span class="ct-b1f167">promises</span><span class="ct-3a0a46">);</span></span><span class="line"><span class="ct-3a0a46"> } </span><span class="ct-15da92">catch</span><span class="ct-3a0a46"> {</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-15da92">return</span><span class="ct-3a0a46"> </span><span class="ct-8dbe8c">null</span><span class="ct-3a0a46">;</span></span><span class="line"><span class="ct-3a0a46"> }</span></span><span class="line"><span class="ct-3a0a46">};</span></span><span class="line"></span><span class="line"><span class="ct-15da92">export</span><span class="ct-388bfd"> </span><span class="ct-15da92">default</span><span class="ct-388bfd"> </span><span class="ct-b1f167">makeBatchRequest</span><span class="ct-3a0a46">;</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-3a0a46"> </span><span class="ct-15da92">import</span><span class="ct-3a0a46"> </span><span class="ct-b1f167">Web3</span><span class="ct-3a0a46"> </span><span class="ct-15da92">from</span><span class="ct-3a0a46"> </span><span class="ct-1598b9">'web3'</span><span class="ct-3a0a46">;</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-a306a2">const</span><span class="ct-3a0a46"> </span><span class="ct-1a19ee">web3</span><span class="ct-3a0a46"> </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> </span><span class="ct-15da92">new</span><span class="ct-3a0a46"> </span><span class="ct-f0fcfa">Web3</span><span class="ct-3a0a46">(</span><span class="ct-1598b9">'YOUR_RPC_ENDPOINT_HERE'</span><span class="ct-3a0a46">);</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-a306a2">const</span><span class="ct-3a0a46"> </span><span class="ct-1a19ee">ABI</span><span class="ct-3a0a46"> </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> </span><span class="ct-1598b9">'YOUR ABI HERE'</span><span class="ct-3a0a46">;</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-a306a2">const</span><span class="ct-3a0a46"> </span><span class="ct-1a19ee">CONTRACT_ADDRESS</span><span class="ct-3a0a46"> </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> </span><span class="ct-1598b9">'YOUR CONTRACT ADDRESS HERE'</span><span class="ct-3a0a46">;</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-a306a2">const</span><span class="ct-3a0a46"> </span><span class="ct-1a19ee">myContract</span><span class="ct-3a0a46"> </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> </span><span class="ct-15da92">new</span><span class="ct-3a0a46"> </span><span class="ct-b1f167">Web3</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">Contract</span><span class="ct-3a0a46">(</span><span class="ct-1a19ee">ABI</span><span class="ct-3a0a46">, </span><span class="ct-1a19ee">CONTRACT_ADDRESS</span><span class="ct-3a0a46">);</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-b1f167">referralProgramContract</span><span class="ct-3a0a46">.</span><span class="ct-b1f167">events</span></span><span class="line"><span class="ct-3a0a46"> .</span><span class="ct-f0fcfa">RegisterUser</span><span class="ct-3a0a46">()</span></span><span class="line"><span class="ct-b9683c"> .</span><span class="ct-959bef">on</span><span class="ct-b9683c">(</span><span class="ct-ff9be8">'connected'</span><span class="ct-b9683c">, (</span><span class="ct-89a961">subscriptionId</span><span class="ct-ccd62f">:</span><span class="ct-b9683c"> </span><span class="ct-101fd8">string</span><span class="ct-b9683c">) </span><span class="ct-a239ee">=></span><span class="ct-b9683c"> {</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-b1f167">console</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">log</span><span class="ct-3a0a46">(</span><span class="ct-1598b9">`| UserRegistered | events | ${</span><span class="ct-b1f167">subscriptionId</span><span class="ct-1598b9">}`</span><span class="ct-3a0a46">);</span></span><span class="line"><span class="ct-3a0a46"> })</span></span><span class="line"><span class="ct-3a0a46"> .</span><span class="ct-f0fcfa">on</span><span class="ct-3a0a46">(</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-1598b9">'data'</span><span class="ct-3a0a46">,</span></span><span class="line"><span class="ct-b9683c"> </span><span class="ct-a239ee">async</span><span class="ct-b9683c"> (</span><span class="ct-89a961">event</span><span class="ct-ccd62f">:</span><span class="ct-b9683c"> {</span></span><span class="line"><span class="ct-b9683c"> </span><span class="ct-89a961">removed</span><span class="ct-ccd62f">:</span><span class="ct-b9683c"> </span><span class="ct-101fd8">boolean</span><span class="ct-b9683c">;</span></span><span class="line"><span class="ct-b9683c"> </span><span class="ct-89a961">returnValues</span><span class="ct-ccd62f">:</span><span class="ct-b9683c"> </span><span class="ct-12bdba">RegisterUserResponseInterface</span><span class="ct-b9683c">;</span></span><span class="line"><span class="ct-3a0a46"> }) </span><span class="ct-a306a2">=></span><span class="ct-3a0a46"> {</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-15da92">try</span><span class="ct-3a0a46"> {</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-15da92">if</span><span class="ct-3a0a46"> (</span><span class="ct-b1f167">event</span><span class="ct-3a0a46">.</span><span class="ct-b1f167">removed</span><span class="ct-3a0a46">) {</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-15da92">return</span><span class="ct-3a0a46">;</span></span><span class="line"><span class="ct-3a0a46"> }</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-a306a2">const</span><span class="ct-3a0a46"> { </span><span class="ct-1a19ee">user</span><span class="ct-3a0a46">, </span><span class="ct-1a19ee">referrer</span><span class="ct-3a0a46"> } </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> </span><span class="ct-b1f167">event</span><span class="ct-3a0a46">.</span><span class="ct-b1f167">returnValues</span><span class="ct-3a0a46">;</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-b1f167">console</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">log</span><span class="ct-3a0a46">(</span><span class="ct-b1f167">user</span><span class="ct-3a0a46">, </span><span class="ct-b1f167">referrer</span><span class="ct-3a0a46">);</span></span><span class="line"><span class="ct-3a0a46"> } </span><span class="ct-15da92">catch</span><span class="ct-3a0a46"> (</span><span class="ct-b1f167">e</span><span class="ct-3a0a46">) {</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-b1f167">console</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">log</span><span class="ct-3a0a46">(</span><span class="ct-1598b9">`| ONCE | ${</span><span class="ct-b1f167">e</span><span class="ct-1598b9">}`</span><span class="ct-3a0a46">);</span></span><span class="line"><span class="ct-3a0a46"> }</span></span><span class="line"><span class="ct-3a0a46"> },</span></span><span class="line"><span class="ct-3a0a46"> )</span></span><span class="line"><span class="ct-b9683c"> .</span><span class="ct-959bef">on</span><span class="ct-b9683c">(</span><span class="ct-ff9be8">'error'</span><span class="ct-b9683c">, (</span><span class="ct-89a961">error</span><span class="ct-ccd62f">:</span><span class="ct-b9683c"> </span><span class="ct-12bdba">ErrnoException</span><span class="ct-b9683c">) </span><span class="ct-a239ee">=></span><span class="ct-b9683c"> {</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-b1f167">console</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">log</span><span class="ct-3a0a46">(</span><span class="ct-b1f167">error</span><span class="ct-3a0a46">);</span></span><span class="line"><span class="ct-3a0a46"> });</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-3a0a46"> </span><span class="ct-a306a2">let</span><span class="ct-3a0a46"> </span><span class="ct-b1f167">options</span><span class="ct-3a0a46"> </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> {</span></span><span class="line"><span class="ct-3a0a46"> filter: {</span></span><span class="line"><span class="ct-3a0a46"> value: [],</span></span><span class="line"><span class="ct-3a0a46"> },</span></span><span class="line"><span class="ct-3a0a46"> fromBlock: </span><span class="ct-f87b40">0</span></span><span class="line"><span class="ct-3a0a46"> };</span></span><span class="line"></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-b1f167">myContract</span><span class="ct-3a0a46">.</span><span class="ct-b1f167">events</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">Transfer</span><span class="ct-3a0a46">(</span><span class="ct-b1f167">options</span><span class="ct-3a0a46">)</span></span><span class="line"><span class="ct-3a0a46"> .</span><span class="ct-f0fcfa">on</span><span class="ct-3a0a46">(</span><span class="ct-1598b9">'data'</span><span class="ct-3a0a46"> </span><span class="ct-f0fcfa">log</span><span class="ct-3a0a46">(</span><span class="ct-b1f167">event</span><span class="ct-3a0a46">))</span></span><span class="line"><span class="ct-3a0a46"> .</span><span class="ct-f0fcfa">on</span><span class="ct-3a0a46">(</span><span class="ct-1598b9">'changed'</span><span class="ct-3a0a46"> </span><span class="ct-f0fcfa">log</span><span class="ct-3a0a46">(</span><span class="ct-b1f167">changed</span><span class="ct-3a0a46">))</span></span><span class="line"><span class="ct-3a0a46"> .</span><span class="ct-f0fcfa">on</span><span class="ct-3a0a46">(</span><span class="ct-1598b9">'error'</span><span class="ct-3a0a46"> </span></span><span class="line"><span class="ct-3a0a46"> .</span><span class="ct-f0fcfa">on</span><span class="ct-3a0a46">(</span><span class="ct-1598b9">'connected'</span><span class="ct-3a0a46"> </span><span class="ct-f0fcfa">log</span><span class="ct-3a0a46">(</span><span class="ct-b1f167">str</span><span class="ct-3a0a46">))</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-3a0a46"> </span><span class="ct-a306a2">let</span><span class="ct-3a0a46"> </span><span class="ct-b1f167">options</span><span class="ct-3a0a46"> </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> {</span></span><span class="line"><span class="ct-3a0a46"> fromBlock: </span><span class="ct-f87b40">0</span><span class="ct-3a0a46">,</span></span><span class="line"><span class="ct-3a0a46"> address: [</span><span class="ct-1598b9">'address-1'</span><span class="ct-3a0a46">, </span><span class="ct-1598b9">'address-2'</span><span class="ct-3a0a46">], </span><span class="ct-cb060a">//Only get events from specific addresses</span></span><span class="line"><span class="ct-3a0a46"> topics: [] </span><span class="ct-cb060a">//What topics to subscribe to</span></span><span class="line"><span class="ct-3a0a46"> };</span></span><span class="line"></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-a306a2">let</span><span class="ct-3a0a46"> </span><span class="ct-b1f167">subscription</span><span class="ct-3a0a46"> </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> (</span><span class="ct-1598b9">'logs'</span><span class="ct-3a0a46">, </span><span class="ct-b1f167">options</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-15da92">if</span><span class="ct-3a0a46"> (</span><span class="ct-15da92">!</span><span class="ct-b1f167">err</span><span class="ct-3a0a46">)</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-b1f167">console</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">log</span><span class="ct-3a0a46">(</span><span class="ct-b1f167">event</span><span class="ct-3a0a46">)</span></span><span class="line"><span class="ct-3a0a46"> });</span></span><span class="line"></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-b1f167">subscription</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">on</span><span class="ct-3a0a46">(</span><span class="ct-1598b9">'data'</span><span class="ct-a306a2">=></span><span class="ct-3a0a46"> </span><span class="ct-b1f167">console</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">log</span><span class="ct-3a0a46">(</span><span class="ct-b1f167">event</span><span class="ct-3a0a46">))</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-b1f167">subscription</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">on</span><span class="ct-3a0a46">(</span><span class="ct-1598b9">'changed'</span><span class="ct-a306a2">=></span><span class="ct-3a0a46"> </span><span class="ct-b1f167">console</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">log</span><span class="ct-3a0a46">(</span><span class="ct-b1f167">changed</span><span class="ct-3a0a46">))</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-b1f167">subscription</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">on</span><span class="ct-3a0a46">(</span><span class="ct-1598b9">'error'</span><span class="ct-a306a2">=></span><span class="ct-3a0a46"> { </span><span class="ct-15da92">throw</span><span class="ct-3a0a46"> </span><span class="ct-b1f167">err</span><span class="ct-3a0a46"> })</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-b1f167">subscription</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">on</span><span class="ct-3a0a46">(</span><span class="ct-1598b9">'connected'</span><span class="ct-a306a2">=></span><span class="ct-3a0a46"> </span><span class="ct-b1f167">console</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">log</span><span class="ct-3a0a46">(</span><span class="ct-b1f167">nr</span><span class="ct-3a0a46">))</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-3a0a46"> </span><span class="ct-cb060a">//example options(optional)</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-a306a2">let</span><span class="ct-3a0a46"> </span><span class="ct-b1f167">options</span><span class="ct-3a0a46"> </span><span class="ct-15da92">=</span><span class="ct-3a0a46"> {</span></span><span class="line"><span class="ct-3a0a46"> filter: {</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-cb060a">// only get events where transfer value was 1000 or 1337</span></span><span class="line"><span class="ct-3a0a46"> value: [</span><span class="ct-1598b9">'1000'</span><span class="ct-3a0a46">, </span><span class="ct-1598b9">'1337'</span><span class="ct-3a0a46">] </span></span><span class="line"><span class="ct-3a0a46"> },</span></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-cb060a">// number | "earliest" | "pending" | "latest"</span></span><span class="line"><span class="ct-3a0a46"> fromBlock: </span><span class="ct-f87b40">0</span><span class="ct-3a0a46">, </span></span><span class="line"><span class="ct-3a0a46"> toBlock: </span><span class="ct-1598b9">'latest'</span></span><span class="line"><span class="ct-3a0a46"> };</span></span><span class="line"></span><span class="line"><span class="ct-3a0a46"> </span><span class="ct-b1f167">myContract</span><span class="ct-3a0a46">.</span><span class="ct-f0fcfa">getPastEvents</span><span class="ct-3a0a46">(</span><span class="ct-1598b9">'Transfer'</span><span class="ct-3a0a46">, </span><span class="ct-b1f167">options</span><span class="ct-3a0a46">)</span></span><span class="line"><span class="ct-3a0a46"> .</span><span class="ct-f0fcfa">then</span><span class="ct-3a0a46"> </span><span class="ct-f0fcfa">log</span><span class="ct-3a0a46">(</span><span class="ct-b1f167">results</span><span class="ct-3a0a46">))</span></span><span class="line"><span class="ct-3a0a46"> .</span><span class="ct-f0fcfa">catch</span><span class="ct-3a0a46"> </span></span></code></pre><!--]--></div><style>.ct-12bdba{color:#FFA657}.ct-ff9be8{color:#A5D6FF}.ct-8dbe8c{color:#79C0FF}.ct-7d3a0f{color:#79C0FF}.ct-f87b40{color:#79C0FF}.ct-1a19ee{color:#79C0FF}.ct-a306a2{color:#FF7B72}.ct-cb060a{color:#8B949E}.ct-388bfd{color:#FFA657}.ct-f0fcfa{color:#D2A8FF}.ct-184ca3{color:#79C0FF}.ct-a828c2{color:#79C0FF}.ct-101fd8{color:#79C0FF}.ct-89a961{color:#FFA657}.ct-ccd62f{color:#FF7B72}.ct-959bef{color:#D2A8FF}.ct-b9683c{color:#C9D1D9}.ct-a239ee{color:#FF7B72}.ct-1598b9{color:#A5D6FF}.ct-b1f167{color:#C9D1D9}.ct-3a0a46{color:#C9D1D9}.ct-15da92{color:#FF7B72}.light .ct-15da92{color:#859900}.light .ct-3a0a46{color:#657B83}.light .ct-b1f167{color:#268BD2}.light .ct-1598b9{color:#2AA198}.light .ct-a239ee{color:#073642}.light .ct-b9683c{color:#657B83}.light .ct-959bef{color:#268BD2}.light .ct-ccd62f{color:#859900}.light .ct-89a961{color:#657B83}.light .ct-101fd8{color:#859900}.light .ct-a828c2{color:#268BD2}.light .ct-184ca3{color:#657B83}.light .ct-f0fcfa{color:#268BD2}.light .ct-388bfd{color:#657B83}.light .ct-cb060a{color:#93A1A1}.light .ct-a306a2{color:#073642}.light .ct-1a19ee{color:#268BD2}.light .ct-f87b40{color:#D33682}.light .ct-7d3a0f{color:#859900}.light .ct-8dbe8c{color:#B58900}.light .ct-ff9be8{color:#2AA198}.light .ct-12bdba{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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