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Author: Fedor Katurov <gotham48@gmail.com>
Date: Thu Nov 10 14:25:54 2022 +0600
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_theme_toggle_1km9a_23"><span></span></button><!--[--><!--[--><main><!--[--><h1>Smart Contracts</h1><article><div><p><!--[-->For common functions see <a href="/blockchain/common-typescript-examples" class=""><!--[-->Common typescript examples<!--]--></a>.<!--]--></p><h2 id="getting-smart-contract-instance"><a href="#getting-smart-contract-instance"><!--[-->Getting smart contract instance<!--]--></a></h2><p><!--[-->Useful for calling smart contract methods:<!--]--></p><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>typescript</span></button><!--[--><pre><code><span class="line"><span class="ct-f28b6b">import</span><span class="ct-ff39a7"> { </span><span class="ct-c087ff">Contract</span><span class="ct-ff39a7"> } </span><span class="ct-f28b6b">from</span><span class="ct-ff39a7"> </span><span class="ct-260fa6">'web3-eth-contract'</span><span class="ct-ff39a7">;</span></span><span class="line"><span class="ct-f28b6b">import</span><span class="ct-ff39a7"> { </span><span class="ct-c087ff">web3</span><span class="ct-ff39a7"> } </span><span class="ct-f28b6b">from</span><span class="ct-ff39a7"> </span><span class="ct-260fa6">'.'</span><span class="ct-ff39a7">;</span></span><span class="line"></span><span class="line"><span class="ct-7c59f3">const</span><span class="ct-34f4b2"> </span><span class="ct-4ebe0c">getContract</span><span class="ct-34f4b2"> </span><span class="ct-1098d8">=</span><span class="ct-34f4b2"> (</span><span class="ct-a995a1">abi</span><span class="ct-1098d8">:</span><span class="ct-34f4b2"> </span><span class="ct-239ef5">object</span><span class="ct-34f4b2">, </span><span class="ct-a995a1">address</span><span class="ct-1098d8">?:</span><span class="ct-34f4b2"> </span><span class="ct-239ef5">string</span><span class="ct-34f4b2">)</span><span class="ct-1098d8">:</span><span class="ct-34f4b2"> </span><span class="ct-7c59f3">=></span><span class="ct-34f4b2"> {</span></span><span class="line"><span class="ct-34f4b2"> </span><span class="ct-7c59f3">const</span><span class="ct-34f4b2"> </span><span class="ct-9650b0">abiFromJson</span><span class="ct-34f4b2"> </span><span class="ct-1098d8">=</span><span class="ct-34f4b2"> </span><span class="ct-16e04b">JSON</span><span class="ct-34f4b2">.</span><span class="ct-9650b0">parse</span><span class="ct-34f4b2">(</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-f28b6b">return</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">new</span><span class="ct-ff39a7"> </span><span class="ct-c087ff">web3</span><span class="ct-ff39a7">.</span><span class="ct-c087ff">eth</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">Contract</span><span class="ct-ff39a7">(</span><span class="ct-c087ff">abiFromJson</span><span class="ct-ff39a7">, </span><span class="ct-c087ff">address</span><span class="ct-ff39a7">);</span></span><span class="line"><span class="ct-ff39a7">};</span></span><span class="line"></span><span class="line"><span class="ct-f28b6b">export</span><span class="ct-802a1b"> </span><span class="ct-f28b6b">default</span><span class="ct-802a1b"> </span><span class="ct-c087ff">getContract</span><span class="ct-ff39a7">;</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-9b710e">// see example below</span></span><span class="line"><span class="ct-f28b6b">import</span><span class="ct-ff39a7"> { </span><span class="ct-c087ff">getContract</span><span class="ct-ff39a7"> } </span><span class="ct-f28b6b">from</span><span class="ct-ff39a7"> </span><span class="ct-260fa6">'.'</span><span class="ct-ff39a7">;</span></span><span class="line"></span><span class="line"><span class="ct-9b710e">// ABI of contract</span></span><span class="line"><span class="ct-d34513">const</span><span class="ct-ff39a7"> </span><span class="ct-2a6828">CONTRACT_ABI</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> { </span><span class="ct-9b710e">/* ... */</span><span class="ct-ff39a7"> };</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-9b710e">// address for contract</span></span><span class="line"><span class="ct-d34513">const</span><span class="ct-ff39a7"> </span><span class="ct-2a6828">CONTRACT_ADDRESS</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> </span><span class="ct-260fa6">'0xdea164f67df4dbfe675d5271c9d404e0260f33bb'</span><span class="ct-ff39a7">;</span></span><span class="line"></span><span class="line"><span class="ct-f28b6b">export</span><span class="ct-ff39a7"> </span><span class="ct-d34513">const</span><span class="ct-ff39a7"> </span><span class="ct-77f80f">executeContractMethod</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> </span><span class="ct-d34513">async</span><span class="ct-ff39a7"> ({}) </span><span class="ct-d34513">=></span><span class="ct-ff39a7"> {</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-9b710e">// getting contract</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-d34513">const</span><span class="ct-ff39a7"> </span><span class="ct-2a6828">contract</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> </span><span class="ct-77f80f">getContract</span><span class="ct-ff39a7">(</span><span class="ct-2a6828">CONTRACT_ABI</span><span class="ct-ff39a7">, </span><span class="ct-2a6828">CONTRACT_ADDRESS</span><span class="ct-ff39a7">);</span></span><span class="line"><span class="ct-ff39a7"> </span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-9b710e">// Calling write method</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-f28b6b">try</span><span class="ct-ff39a7"> {</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-9b710e">// authorizing with Metamask</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-f28b6b">await</span><span class="ct-ff39a7"> </span><span class="ct-c087ff">web3</span><span class="ct-ff39a7">.</span><span class="ct-c087ff">currentProvider</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">request</span><span class="ct-ff39a7">({ method: </span><span class="ct-260fa6">'eth_requestAccounts'</span><span class="ct-ff39a7"> });</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-9b710e">// getting wallet address</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-d34513">const</span><span class="ct-ff39a7"> </span><span class="ct-2a6828">addressUser</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> </span><span class="ct-c087ff">web3</span><span class="ct-ff39a7">.</span><span class="ct-c087ff">currentProvider</span><span class="ct-ff39a7">.</span><span class="ct-c087ff">selectedAddress</span><span class="ct-ff39a7">;</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-9b710e">// calling "store" store method for contract</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-9b710e">// payload should include `from` address, that matches</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-9b710e">// current user's wallet</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-f28b6b">await</span><span class="ct-ff39a7"> </span><span class="ct-c087ff">contract</span><span class="ct-ff39a7">.</span><span class="ct-c087ff">methods</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">store</span><span class="ct-ff39a7">(</span><span class="ct-d723ea">0</span><span class="ct-ff39a7">, </span><span class="ct-260fa6">'Parameter'</span><span class="ct-ff39a7">).</span><span class="ct-77f80f">send</span><span class="ct-ff39a7">({</span></span><span class="line"><span class="ct-ff39a7"> from: </span><span class="ct-c087ff">addressUser</span><span class="ct-ff39a7">,</span></span><span class="line"><span class="ct-ff39a7"> });</span></span><span class="line"><span class="ct-ff39a7"> } </span><span class="ct-f28b6b">catch</span><span class="ct-ff39a7"> (</span><span class="ct-c087ff">e</span><span class="ct-ff39a7">) {</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-f28b6b">throw</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">new</span><span class="ct-ff39a7"> </span><span class="ct-5174bf">Error</span><span class="ct-ff39a7">(</span><span class="ct-c087ff">e</span><span class="ct-ff39a7">);</span></span><span class="line"><span class="ct-ff39a7"> }</span></span><span class="line"><span class="ct-ff39a7"> </span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-9b710e">// calling read method</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-f28b6b">try</span><span class="ct-ff39a7"> {</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-9b710e">// this method can return data</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-d34513">const</span><span class="ct-ff39a7"> </span><span class="ct-2a6828">result</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">await</span><span class="ct-ff39a7"> </span><span class="ct-c087ff">contract</span><span class="ct-ff39a7">.</span><span class="ct-c087ff">methods</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">retrieve</span><span class="ct-ff39a7">().</span><span class="ct-77f80f">call</span><span class="ct-ff39a7">();</span></span><span class="line"><span class="ct-ff39a7"> } </span><span class="ct-f28b6b">catch</span><span class="ct-ff39a7"> (</span><span class="ct-c087ff">e</span><span class="ct-ff39a7">) {</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-f28b6b">throw</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">new</span><span class="ct-ff39a7"> </span><span class="ct-5174bf">Error</span><span class="ct-ff39a7">(</span><span class="ct-c087ff">e</span><span class="ct-ff39a7">);</span></span><span class="line"><span class="ct-ff39a7"> }</span></span><span class="line"><span class="ct-ff39a7">}</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-9b710e">// see example below</span></span><span class="line"><span class="ct-f28b6b">import</span><span class="ct-ff39a7"> { </span><span class="ct-c087ff">getContract</span><span class="ct-ff39a7"> } </span><span class="ct-f28b6b">from</span><span class="ct-ff39a7"> </span><span class="ct-260fa6">'.'</span><span class="ct-ff39a7">;</span></span><span class="line"></span><span class="line"><span class="ct-9b710e">// ABI контракта</span></span><span class="line"><span class="ct-d34513">const</span><span class="ct-ff39a7"> </span><span class="ct-2a6828">CONTRACT_ABI</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> { </span><span class="ct-9b710e">/* ... */</span><span class="ct-ff39a7"> };</span></span><span class="line"><span class="ct-9b710e">// contract address</span></span><span class="line"><span class="ct-d34513">const</span><span class="ct-ff39a7"> </span><span class="ct-2a6828">CONTRACT_ADDRESS</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> </span><span class="ct-260fa6">'0xdea164f67df4dbfe675d5271c9d404e0260f33bb'</span><span class="ct-ff39a7">;</span></span><span class="line"><span class="ct-9b710e">// getting contract</span></span><span class="line"><span class="ct-d34513">const</span><span class="ct-ff39a7"> </span><span class="ct-2a6828">contract</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> </span><span class="ct-77f80f">getContract</span><span class="ct-ff39a7">(</span><span class="ct-2a6828">CONTRACT_ABI</span><span class="ct-ff39a7">, </span><span class="ct-2a6828">CONTRACT_ADDRESS</span><span class="ct-ff39a7">);</span></span><span class="line"><span class="ct-9b710e">// account's private key</span></span><span class="line"><span class="ct-d34513">const</span><span class="ct-ff39a7"> </span><span class="ct-2a6828">privateKey</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> </span><span class="ct-260fa6">'...'</span><span class="ct-ff39a7">;</span></span><span class="line"></span><span class="line"><span class="ct-9b710e">// write-methods requires private key</span></span><span class="line"><span class="ct-7c59f3">const</span><span class="ct-34f4b2"> </span><span class="ct-4ebe0c">executeContractMethod</span><span class="ct-34f4b2"> </span><span class="ct-1098d8">=</span><span class="ct-34f4b2"> </span><span class="ct-7c59f3">async</span><span class="ct-34f4b2"> (</span><span class="ct-a995a1">val</span><span class="ct-1098d8">:</span><span class="ct-34f4b2"> </span><span class="ct-239ef5">number</span><span class="ct-34f4b2">) </span><span class="ct-7c59f3">=></span><span class="ct-34f4b2"> {</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-d34513">const</span><span class="ct-ff39a7"> </span><span class="ct-2a6828">transaction</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> </span><span class="ct-c087ff">contract</span><span class="ct-ff39a7">.</span><span class="ct-c087ff">methods</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">store</span><span class="ct-ff39a7">(</span><span class="ct-c087ff">val</span><span class="ct-ff39a7">);</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-d34513">const</span><span class="ct-ff39a7"> </span><span class="ct-2a6828">account</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> </span><span class="ct-c087ff">web3</span><span class="ct-ff39a7">.</span><span class="ct-c087ff">eth</span><span class="ct-ff39a7">.</span><span class="ct-c087ff">accounts</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">privateKeyToAccount</span><span class="ct-ff39a7">(</span><span class="ct-c087ff">privateKey</span><span class="ct-ff39a7">);</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-d34513">const</span><span class="ct-ff39a7"> </span><span class="ct-2a6828">options</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> {</span></span><span class="line"><span class="ct-ff39a7"> to: </span><span class="ct-2a6828">CONTRACT_ADDRESS</span><span class="ct-ff39a7">,</span></span><span class="line"><span class="ct-ff39a7"> data: </span><span class="ct-c087ff">transaction</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">encodeABI</span><span class="ct-ff39a7">(),</span></span><span class="line"><span class="ct-ff39a7"> gas: </span><span class="ct-f28b6b">await</span><span class="ct-ff39a7"> </span><span class="ct-c087ff">transaction</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">estimateGas</span><span class="ct-ff39a7">({ from: </span><span class="ct-c087ff">account</span><span class="ct-ff39a7">.</span><span class="ct-c087ff">address</span><span class="ct-ff39a7"> }),</span></span><span class="line"><span class="ct-ff39a7"> gasPrice: </span><span class="ct-f28b6b">await</span><span class="ct-ff39a7"> </span><span class="ct-c087ff">web3</span><span class="ct-ff39a7">.</span><span class="ct-c087ff">eth</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">getGasPrice</span><span class="ct-ff39a7">(),</span></span><span class="line"><span class="ct-ff39a7"> };</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-d34513">const</span><span class="ct-ff39a7"> </span><span class="ct-2a6828">signed</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">await</span><span class="ct-ff39a7"> </span><span class="ct-c087ff">web3</span><span class="ct-ff39a7">.</span><span class="ct-c087ff">eth</span><span class="ct-ff39a7">.</span><span class="ct-c087ff">accounts</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">signTransaction</span><span class="ct-ff39a7">(</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-c087ff">options</span><span class="ct-ff39a7">,</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-c087ff">privateKey</span><span class="ct-ff39a7">,</span></span><span class="line"><span class="ct-ff39a7"> );</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-f28b6b">await</span><span class="ct-ff39a7"> </span><span class="ct-c087ff">web3</span><span class="ct-ff39a7">.</span><span class="ct-c087ff">eth</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">sendSignedTransaction</span><span class="ct-ff39a7">(</span><span class="ct-c087ff">signed</span><span class="ct-ff39a7">.</span><span class="ct-c087ff">rawTransaction</span><span class="ct-f28b6b">!</span><span class="ct-ff39a7">);</span></span><span class="line"><span class="ct-ff39a7">};</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-ff39a7"> </span><span class="ct-d34513">const</span><span class="ct-ff39a7"> </span><span class="ct-2a6828">requests</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> [</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-c087ff">contract</span><span class="ct-ff39a7">.</span><span class="ct-c087ff">method</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">balanceOf</span><span class="ct-ff39a7">().</span><span class="ct-c087ff">call</span><span class="ct-ff39a7">,</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-c087ff">contract</span><span class="ct-ff39a7">.</span><span class="ct-c087ff">method</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">getStaked</span><span class="ct-ff39a7">().</span><span class="ct-c087ff">call</span></span><span class="line"><span class="ct-ff39a7"> ]</span></span><span class="line"></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-d34513">const</span><span class="ct-ff39a7"> </span><span class="ct-2a6828">result</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">await</span><span class="ct-ff39a7"> </span><span class="ct-77f80f">makeBatchRequest</span><span class="ct-ff39a7">(</span><span class="ct-c087ff">request</span><span class="ct-ff39a7">);</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-d34513">const</span><span class="ct-ff39a7"> </span><span class="ct-2a6828">web3</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">new</span><span class="ct-ff39a7"> </span><span class="ct-77f80f">Web3</span><span class="ct-ff39a7">(</span><span class="ct-c087ff">Web3</span><span class="ct-ff39a7">.</span><span class="ct-c087ff">givenProvider</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">||</span><span class="ct-ff39a7"> </span><span class="ct-2a6828">PROVIDER_URL</span><span class="ct-ff39a7">);</span></span><span class="line"></span><span class="line"><span class="ct-7c59f3">const</span><span class="ct-34f4b2"> </span><span class="ct-4ebe0c">makeBatchRequest</span><span class="ct-34f4b2"> </span><span class="ct-1098d8">=</span><span class="ct-34f4b2"> (</span><span class="ct-a995a1">calls</span><span class="ct-1098d8">:</span><span class="ct-34f4b2"> </span><span class="ct-239ef5">any</span><span class="ct-34f4b2">[]) </span><span class="ct-7c59f3">=></span><span class="ct-34f4b2"> {</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-f28b6b">try</span><span class="ct-ff39a7"> {</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-d34513">const</span><span class="ct-ff39a7"> </span><span class="ct-2a6828">web3</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> </span><span class="ct-77f80f">getWeb3NoAccount</span><span class="ct-ff39a7">();</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-d34513">const</span><span class="ct-ff39a7"> </span><span class="ct-2a6828">batch</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">new</span><span class="ct-ff39a7"> </span><span class="ct-c087ff">web3</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">BatchRequest</span><span class="ct-ff39a7">();</span></span><span class="line"></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-d34513">const</span><span class="ct-ff39a7"> </span><span class="ct-2a6828">promises</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> </span><span class="ct-c087ff">calls</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">map</span><span class="ct-d34513">=></span><span class="ct-ff39a7"> {</span></span><span class="line"><span class="ct-34f4b2"> </span><span class="ct-1098d8">return</span><span class="ct-34f4b2"> </span><span class="ct-1098d8">new</span><span class="ct-34f4b2"> </span><span class="ct-239ef5">Promise</span><span class="ct-34f4b2">((</span><span class="ct-a995a1">resolve</span><span class="ct-34f4b2">, </span><span class="ct-a995a1">reject</span><span class="ct-34f4b2">) </span><span class="ct-7c59f3">=></span><span class="ct-34f4b2"> {</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-c087ff">batch</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">add</span><span class="ct-ff39a7">(</span></span><span class="line"></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-f28b6b">if</span><span class="ct-ff39a7"> (</span><span class="ct-c087ff">err</span><span class="ct-ff39a7">) {</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-77f80f">reject</span><span class="ct-ff39a7">(</span><span class="ct-c087ff">err</span><span class="ct-ff39a7">);</span></span><span class="line"><span class="ct-ff39a7"> } </span><span class="ct-f28b6b">else</span><span class="ct-ff39a7"> {</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-77f80f">resolve</span><span class="ct-ff39a7">(</span><span class="ct-c087ff">result</span><span class="ct-ff39a7">);</span></span><span class="line"><span class="ct-ff39a7"> }</span></span><span class="line"><span class="ct-ff39a7"> })</span></span><span class="line"><span class="ct-ff39a7"> );</span></span><span class="line"><span class="ct-ff39a7"> });</span></span><span class="line"><span class="ct-ff39a7"> });</span></span><span class="line"></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-c087ff">batch</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">execute</span><span class="ct-ff39a7">();</span></span><span class="line"></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-f28b6b">return</span><span class="ct-ff39a7"> </span><span class="ct-5174bf">Promise</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">all</span><span class="ct-ff39a7">(</span><span class="ct-c087ff">promises</span><span class="ct-ff39a7">);</span></span><span class="line"><span class="ct-ff39a7"> } </span><span class="ct-f28b6b">catch</span><span class="ct-ff39a7"> {</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-f28b6b">return</span><span class="ct-ff39a7"> </span><span class="ct-7a9121">null</span><span class="ct-ff39a7">;</span></span><span class="line"><span class="ct-ff39a7"> }</span></span><span class="line"><span class="ct-ff39a7">};</span></span><span class="line"></span><span class="line"><span class="ct-f28b6b">export</span><span class="ct-802a1b"> </span><span class="ct-f28b6b">default</span><span class="ct-802a1b"> </span><span class="ct-c087ff">makeBatchRequest</span><span class="ct-ff39a7">;</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-ff39a7"> </span><span class="ct-f28b6b">import</span><span class="ct-ff39a7"> </span><span class="ct-c087ff">Web3</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">from</span><span class="ct-ff39a7"> </span><span class="ct-260fa6">'web3'</span><span class="ct-ff39a7">;</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-d34513">const</span><span class="ct-ff39a7"> </span><span class="ct-2a6828">web3</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">new</span><span class="ct-ff39a7"> </span><span class="ct-77f80f">Web3</span><span class="ct-ff39a7">(</span><span class="ct-260fa6">'YOUR_RPC_ENDPOINT_HERE'</span><span class="ct-ff39a7">);</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-d34513">const</span><span class="ct-ff39a7"> </span><span class="ct-2a6828">ABI</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> </span><span class="ct-260fa6">'YOUR ABI HERE'</span><span class="ct-ff39a7">;</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-d34513">const</span><span class="ct-ff39a7"> </span><span class="ct-2a6828">CONTRACT_ADDRESS</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> </span><span class="ct-260fa6">'YOUR CONTRACT ADDRESS HERE'</span><span class="ct-ff39a7">;</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-d34513">const</span><span class="ct-ff39a7"> </span><span class="ct-2a6828">myContract</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">new</span><span class="ct-ff39a7"> </span><span class="ct-c087ff">Web3</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">Contract</span><span class="ct-ff39a7">(</span><span class="ct-2a6828">ABI</span><span class="ct-ff39a7">, </span><span class="ct-2a6828">CONTRACT_ADDRESS</span><span class="ct-ff39a7">);</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-c087ff">referralProgramContract</span><span class="ct-ff39a7">.</span><span class="ct-c087ff">events</span></span><span class="line"><span class="ct-ff39a7"> .</span><span class="ct-77f80f">RegisterUser</span><span class="ct-ff39a7">()</span></span><span class="line"><span class="ct-34f4b2"> .</span><span class="ct-4ebe0c">on</span><span class="ct-34f4b2">(</span><span class="ct-69be08">'connected'</span><span class="ct-34f4b2">, (</span><span class="ct-a995a1">subscriptionId</span><span class="ct-1098d8">:</span><span class="ct-34f4b2"> </span><span class="ct-239ef5">string</span><span class="ct-34f4b2">) </span><span class="ct-7c59f3">=></span><span class="ct-34f4b2"> {</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-c087ff">console</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">log</span><span class="ct-ff39a7">(</span><span class="ct-260fa6">`| UserRegistered | events | ${</span><span class="ct-c087ff">subscriptionId</span><span class="ct-260fa6">}`</span><span class="ct-ff39a7">);</span></span><span class="line"><span class="ct-ff39a7"> })</span></span><span class="line"><span class="ct-ff39a7"> .</span><span class="ct-77f80f">on</span><span class="ct-ff39a7">(</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-260fa6">'data'</span><span class="ct-ff39a7">,</span></span><span class="line"><span class="ct-34f4b2"> </span><span class="ct-7c59f3">async</span><span class="ct-34f4b2"> (</span><span class="ct-a995a1">event</span><span class="ct-1098d8">:</span><span class="ct-34f4b2"> {</span></span><span class="line"><span class="ct-34f4b2"> </span><span class="ct-a995a1">removed</span><span class="ct-1098d8">:</span><span class="ct-34f4b2"> </span><span class="ct-239ef5">boolean</span><span class="ct-34f4b2">;</span></span><span class="line"><span class="ct-34f4b2"> </span><span class="ct-a995a1">returnValues</span><span class="ct-1098d8">:</span><span class="ct-34f4b2"> </span><span class="ct-fe1aa9">RegisterUserResponseInterface</span><span class="ct-34f4b2">;</span></span><span class="line"><span class="ct-ff39a7"> }) </span><span class="ct-d34513">=></span><span class="ct-ff39a7"> {</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-f28b6b">try</span><span class="ct-ff39a7"> {</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-f28b6b">if</span><span class="ct-ff39a7"> (</span><span class="ct-c087ff">event</span><span class="ct-ff39a7">.</span><span class="ct-c087ff">removed</span><span class="ct-ff39a7">) {</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-f28b6b">return</span><span class="ct-ff39a7">;</span></span><span class="line"><span class="ct-ff39a7"> }</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-d34513">const</span><span class="ct-ff39a7"> { </span><span class="ct-2a6828">user</span><span class="ct-ff39a7">, </span><span class="ct-2a6828">referrer</span><span class="ct-ff39a7"> } </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> </span><span class="ct-c087ff">event</span><span class="ct-ff39a7">.</span><span class="ct-c087ff">returnValues</span><span class="ct-ff39a7">;</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-c087ff">console</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">log</span><span class="ct-ff39a7">(</span><span class="ct-c087ff">user</span><span class="ct-ff39a7">, </span><span class="ct-c087ff">referrer</span><span class="ct-ff39a7">);</span></span><span class="line"><span class="ct-ff39a7"> } </span><span class="ct-f28b6b">catch</span><span class="ct-ff39a7"> (</span><span class="ct-c087ff">e</span><span class="ct-ff39a7">) {</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-c087ff">console</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">log</span><span class="ct-ff39a7">(</span><span class="ct-260fa6">`| ONCE | ${</span><span class="ct-c087ff">e</span><span class="ct-260fa6">}`</span><span class="ct-ff39a7">);</span></span><span class="line"><span class="ct-ff39a7"> }</span></span><span class="line"><span class="ct-ff39a7"> },</span></span><span class="line"><span class="ct-ff39a7"> )</span></span><span class="line"><span class="ct-34f4b2"> .</span><span class="ct-4ebe0c">on</span><span class="ct-34f4b2">(</span><span class="ct-69be08">'error'</span><span class="ct-34f4b2">, (</span><span class="ct-a995a1">error</span><span class="ct-1098d8">:</span><span class="ct-34f4b2"> </span><span class="ct-fe1aa9">ErrnoException</span><span class="ct-34f4b2">) </span><span class="ct-7c59f3">=></span><span class="ct-34f4b2"> {</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-c087ff">console</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">log</span><span class="ct-ff39a7">(</span><span class="ct-c087ff">error</span><span class="ct-ff39a7">);</span></span><span class="line"><span class="ct-ff39a7"> });</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-ff39a7"> </span><span class="ct-d34513">let</span><span class="ct-ff39a7"> </span><span class="ct-c087ff">options</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> {</span></span><span class="line"><span class="ct-ff39a7"> filter: {</span></span><span class="line"><span class="ct-ff39a7"> value: [],</span></span><span class="line"><span class="ct-ff39a7"> },</span></span><span class="line"><span class="ct-ff39a7"> fromBlock: </span><span class="ct-d723ea">0</span></span><span class="line"><span class="ct-ff39a7"> };</span></span><span class="line"></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-c087ff">myContract</span><span class="ct-ff39a7">.</span><span class="ct-c087ff">events</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">Transfer</span><span class="ct-ff39a7">(</span><span class="ct-c087ff">options</span><span class="ct-ff39a7">)</span></span><span class="line"><span class="ct-ff39a7"> .</span><span class="ct-77f80f">on</span><span class="ct-ff39a7">(</span><span class="ct-260fa6">'data'</span><span class="ct-ff39a7"> </span><span class="ct-77f80f">log</span><span class="ct-ff39a7">(</span><span class="ct-c087ff">event</span><span class="ct-ff39a7">))</span></span><span class="line"><span class="ct-ff39a7"> .</span><span class="ct-77f80f">on</span><span class="ct-ff39a7">(</span><span class="ct-260fa6">'changed'</span><span class="ct-ff39a7"> </span><span class="ct-77f80f">log</span><span class="ct-ff39a7">(</span><span class="ct-c087ff">changed</span><span class="ct-ff39a7">))</span></span><span class="line"><span class="ct-ff39a7"> .</span><span class="ct-77f80f">on</span><span class="ct-ff39a7">(</span><span class="ct-260fa6">'error'</span><span class="ct-ff39a7"> </span></span><span class="line"><span class="ct-ff39a7"> .</span><span class="ct-77f80f">on</span><span class="ct-ff39a7">(</span><span class="ct-260fa6">'connected'</span><span class="ct-ff39a7"> </span><span class="ct-77f80f">log</span><span class="ct-ff39a7">(</span><span class="ct-c087ff">str</span><span class="ct-ff39a7">))</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-ff39a7"> </span><span class="ct-d34513">let</span><span class="ct-ff39a7"> </span><span class="ct-c087ff">options</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> {</span></span><span class="line"><span class="ct-ff39a7"> fromBlock: </span><span class="ct-d723ea">0</span><span class="ct-ff39a7">,</span></span><span class="line"><span class="ct-ff39a7"> address: [</span><span class="ct-260fa6">'address-1'</span><span class="ct-ff39a7">, </span><span class="ct-260fa6">'address-2'</span><span class="ct-ff39a7">], </span><span class="ct-9b710e">//Only get events from specific addresses</span></span><span class="line"><span class="ct-ff39a7"> topics: [] </span><span class="ct-9b710e">//What topics to subscribe to</span></span><span class="line"><span class="ct-ff39a7"> };</span></span><span class="line"></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-d34513">let</span><span class="ct-ff39a7"> </span><span class="ct-c087ff">subscription</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> (</span><span class="ct-260fa6">'logs'</span><span class="ct-ff39a7">, </span><span class="ct-c087ff">options</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-f28b6b">if</span><span class="ct-ff39a7"> (</span><span class="ct-f28b6b">!</span><span class="ct-c087ff">err</span><span class="ct-ff39a7">)</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-c087ff">console</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">log</span><span class="ct-ff39a7">(</span><span class="ct-c087ff">event</span><span class="ct-ff39a7">)</span></span><span class="line"><span class="ct-ff39a7"> });</span></span><span class="line"></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-c087ff">subscription</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">on</span><span class="ct-ff39a7">(</span><span class="ct-260fa6">'data'</span><span class="ct-d34513">=></span><span class="ct-ff39a7"> </span><span class="ct-c087ff">console</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">log</span><span class="ct-ff39a7">(</span><span class="ct-c087ff">event</span><span class="ct-ff39a7">))</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-c087ff">subscription</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">on</span><span class="ct-ff39a7">(</span><span class="ct-260fa6">'changed'</span><span class="ct-d34513">=></span><span class="ct-ff39a7"> </span><span class="ct-c087ff">console</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">log</span><span class="ct-ff39a7">(</span><span class="ct-c087ff">changed</span><span class="ct-ff39a7">))</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-c087ff">subscription</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">on</span><span class="ct-ff39a7">(</span><span class="ct-260fa6">'error'</span><span class="ct-d34513">=></span><span class="ct-ff39a7"> { </span><span class="ct-f28b6b">throw</span><span class="ct-ff39a7"> </span><span class="ct-c087ff">err</span><span class="ct-ff39a7"> })</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-c087ff">subscription</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">on</span><span class="ct-ff39a7">(</span><span class="ct-260fa6">'connected'</span><span class="ct-d34513">=></span><span class="ct-ff39a7"> </span><span class="ct-c087ff">console</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">log</span><span class="ct-ff39a7">(</span><span class="ct-c087ff">nr</span><span class="ct-ff39a7">))</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-ff39a7"> </span><span class="ct-9b710e">//example options(optional)</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-d34513">let</span><span class="ct-ff39a7"> </span><span class="ct-c087ff">options</span><span class="ct-ff39a7"> </span><span class="ct-f28b6b">=</span><span class="ct-ff39a7"> {</span></span><span class="line"><span class="ct-ff39a7"> filter: {</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-9b710e">// only get events where transfer value was 1000 or 1337</span></span><span class="line"><span class="ct-ff39a7"> value: [</span><span class="ct-260fa6">'1000'</span><span class="ct-ff39a7">, </span><span class="ct-260fa6">'1337'</span><span class="ct-ff39a7">] </span></span><span class="line"><span class="ct-ff39a7"> },</span></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-9b710e">// number | "earliest" | "pending" | "latest"</span></span><span class="line"><span class="ct-ff39a7"> fromBlock: </span><span class="ct-d723ea">0</span><span class="ct-ff39a7">, </span></span><span class="line"><span class="ct-ff39a7"> toBlock: </span><span class="ct-260fa6">'latest'</span></span><span class="line"><span class="ct-ff39a7"> };</span></span><span class="line"></span><span class="line"><span class="ct-ff39a7"> </span><span class="ct-c087ff">myContract</span><span class="ct-ff39a7">.</span><span class="ct-77f80f">getPastEvents</span><span class="ct-ff39a7">(</span><span class="ct-260fa6">'Transfer'</span><span class="ct-ff39a7">, </span><span class="ct-c087ff">options</span><span class="ct-ff39a7">)</span></span><span class="line"><span class="ct-ff39a7"> .</span><span class="ct-77f80f">then</span><span class="ct-ff39a7"> </span><span class="ct-77f80f">log</span><span class="ct-ff39a7">(</span><span class="ct-c087ff">results</span><span class="ct-ff39a7">))</span></span><span class="line"><span class="ct-ff39a7"> .</span><span class="ct-77f80f">catch</span><span class="ct-ff39a7"> </span></span></code></pre><!--]--></div><style>.ct-fe1aa9{color:#FFA657}.ct-69be08{color:#A5D6FF}.ct-7a9121{color:#79C0FF}.ct-5174bf{color:#79C0FF}.ct-d723ea{color:#79C0FF}.ct-2a6828{color:#79C0FF}.ct-d34513{color:#FF7B72}.ct-9b710e{color:#8B949E}.ct-802a1b{color:#FFA657}.ct-77f80f{color:#D2A8FF}.ct-16e04b{color:#79C0FF}.ct-9650b0{color:#79C0FF}.ct-239ef5{color:#79C0FF}.ct-a995a1{color:#FFA657}.ct-1098d8{color:#FF7B72}.ct-4ebe0c{color:#D2A8FF}.ct-34f4b2{color:#C9D1D9}.ct-7c59f3{color:#FF7B72}.ct-260fa6{color:#A5D6FF}.ct-c087ff{color:#C9D1D9}.ct-ff39a7{color:#C9D1D9}.ct-f28b6b{color:#FF7B72}.light .ct-f28b6b{color:#859900}.light .ct-ff39a7{color:#657B83}.light .ct-c087ff{color:#268BD2}.light .ct-260fa6{color:#2AA198}.light .ct-7c59f3{color:#073642}.light .ct-34f4b2{color:#657B83}.light .ct-4ebe0c{color:#268BD2}.light .ct-1098d8{color:#859900}.light .ct-a995a1{color:#657B83}.light .ct-239ef5{color:#859900}.light .ct-9650b0{color:#268BD2}.light .ct-16e04b{color:#657B83}.light .ct-77f80f{color:#268BD2}.light .ct-802a1b{color:#657B83}.light .ct-9b710e{color:#93A1A1}.light .ct-d34513{color:#073642}.light .ct-2a6828{color:#268BD2}.light .ct-d723ea{color:#D33682}.light .ct-5174bf{color:#859900}.light .ct-7a9121{color:#B58900}.light .ct-69be08{color:#2AA198}.light .ct-fe1aa9{color:#268BD2}</style></div></article><!--]--></main><!--]--><!--]--></div><footer class="_footer_ogxvf_1 _footer_1km9a_17 _footer_1km9a_17"><div>btw, have a nice day</div><div class="_filler_ogxvf_9"></div><div> (2018 - 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