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Author: Fedor Katurov <gotham48@gmail.com>
Date: Thu Nov 10 14:33:09 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-7e743e">import</span><span class="ct-899cb1"> { </span><span class="ct-7c8609">Contract</span><span class="ct-899cb1"> } </span><span class="ct-7e743e">from</span><span class="ct-899cb1"> </span><span class="ct-15fc19">'web3-eth-contract'</span><span class="ct-899cb1">;</span></span><span class="line"><span class="ct-7e743e">import</span><span class="ct-899cb1"> { </span><span class="ct-7c8609">web3</span><span class="ct-899cb1"> } </span><span class="ct-7e743e">from</span><span class="ct-899cb1"> </span><span class="ct-15fc19">'.'</span><span class="ct-899cb1">;</span></span><span class="line"></span><span class="line"><span class="ct-46bcc9">const</span><span class="ct-32f53d"> </span><span class="ct-9de887">getContract</span><span class="ct-32f53d"> </span><span class="ct-11f4f9">=</span><span class="ct-32f53d"> (</span><span class="ct-6aec93">abi</span><span class="ct-11f4f9">:</span><span class="ct-32f53d"> </span><span class="ct-cff7b3">object</span><span class="ct-32f53d">, </span><span class="ct-6aec93">address</span><span class="ct-11f4f9">?:</span><span class="ct-32f53d"> </span><span class="ct-cff7b3">string</span><span class="ct-32f53d">)</span><span class="ct-11f4f9">:</span><span class="ct-32f53d"> </span><span class="ct-46bcc9">=></span><span class="ct-32f53d"> {</span></span><span class="line"><span class="ct-32f53d"> </span><span class="ct-46bcc9">const</span><span class="ct-32f53d"> </span><span class="ct-42c20d">abiFromJson</span><span class="ct-32f53d"> </span><span class="ct-11f4f9">=</span><span class="ct-32f53d"> </span><span class="ct-0eb029">JSON</span><span class="ct-32f53d">.</span><span class="ct-42c20d">parse</span><span class="ct-32f53d">(</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7e743e">return</span><span class="ct-899cb1"> </span><span class="ct-7e743e">new</span><span class="ct-899cb1"> </span><span class="ct-7c8609">web3</span><span class="ct-899cb1">.</span><span class="ct-7c8609">eth</span><span class="ct-899cb1">.</span><span class="ct-98fc15">Contract</span><span class="ct-899cb1">(</span><span class="ct-7c8609">abiFromJson</span><span class="ct-899cb1">, </span><span class="ct-7c8609">address</span><span class="ct-899cb1">);</span></span><span class="line"><span class="ct-899cb1">};</span></span><span class="line"></span><span class="line"><span class="ct-7e743e">export</span><span class="ct-e1aed8"> </span><span class="ct-7e743e">default</span><span class="ct-e1aed8"> </span><span class="ct-7c8609">getContract</span><span class="ct-899cb1">;</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-e86127">// see example below</span></span><span class="line"><span class="ct-7e743e">import</span><span class="ct-899cb1"> { </span><span class="ct-7c8609">getContract</span><span class="ct-899cb1"> } </span><span class="ct-7e743e">from</span><span class="ct-899cb1"> </span><span class="ct-15fc19">'.'</span><span class="ct-899cb1">;</span></span><span class="line"></span><span class="line"><span class="ct-e86127">// ABI of contract</span></span><span class="line"><span class="ct-2111a2">const</span><span class="ct-899cb1"> </span><span class="ct-aa452a">CONTRACT_ABI</span><span class="ct-899cb1"> </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> { </span><span class="ct-e86127">/* ... */</span><span class="ct-899cb1"> };</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-e86127">// address for contract</span></span><span class="line"><span class="ct-2111a2">const</span><span class="ct-899cb1"> </span><span class="ct-aa452a">CONTRACT_ADDRESS</span><span class="ct-899cb1"> </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> </span><span class="ct-15fc19">'0xdea164f67df4dbfe675d5271c9d404e0260f33bb'</span><span class="ct-899cb1">;</span></span><span class="line"></span><span class="line"><span class="ct-7e743e">export</span><span class="ct-899cb1"> </span><span class="ct-2111a2">const</span><span class="ct-899cb1"> </span><span class="ct-98fc15">executeContractMethod</span><span class="ct-899cb1"> </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> </span><span class="ct-2111a2">async</span><span class="ct-899cb1"> ({}) </span><span class="ct-2111a2">=></span><span class="ct-899cb1"> {</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-e86127">// getting contract</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-2111a2">const</span><span class="ct-899cb1"> </span><span class="ct-aa452a">contract</span><span class="ct-899cb1"> </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> </span><span class="ct-98fc15">getContract</span><span class="ct-899cb1">(</span><span class="ct-aa452a">CONTRACT_ABI</span><span class="ct-899cb1">, </span><span class="ct-aa452a">CONTRACT_ADDRESS</span><span class="ct-899cb1">);</span></span><span class="line"><span class="ct-899cb1"> </span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-e86127">// Calling write method</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7e743e">try</span><span class="ct-899cb1"> {</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-e86127">// authorizing with Metamask</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7e743e">await</span><span class="ct-899cb1"> </span><span class="ct-7c8609">web3</span><span class="ct-899cb1">.</span><span class="ct-7c8609">currentProvider</span><span class="ct-899cb1">.</span><span class="ct-98fc15">request</span><span class="ct-899cb1">({ method: </span><span class="ct-15fc19">'eth_requestAccounts'</span><span class="ct-899cb1"> });</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-e86127">// getting wallet address</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-2111a2">const</span><span class="ct-899cb1"> </span><span class="ct-aa452a">addressUser</span><span class="ct-899cb1"> </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> </span><span class="ct-7c8609">web3</span><span class="ct-899cb1">.</span><span class="ct-7c8609">currentProvider</span><span class="ct-899cb1">.</span><span class="ct-7c8609">selectedAddress</span><span class="ct-899cb1">;</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-e86127">// calling "store" store method for contract</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-e86127">// payload should include `from` address, that matches</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-e86127">// current user's wallet</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7e743e">await</span><span class="ct-899cb1"> </span><span class="ct-7c8609">contract</span><span class="ct-899cb1">.</span><span class="ct-7c8609">methods</span><span class="ct-899cb1">.</span><span class="ct-98fc15">store</span><span class="ct-899cb1">(</span><span class="ct-6a817f">0</span><span class="ct-899cb1">, </span><span class="ct-15fc19">'Parameter'</span><span class="ct-899cb1">).</span><span class="ct-98fc15">send</span><span class="ct-899cb1">({</span></span><span class="line"><span class="ct-899cb1"> from: </span><span class="ct-7c8609">addressUser</span><span class="ct-899cb1">,</span></span><span class="line"><span class="ct-899cb1"> });</span></span><span class="line"><span class="ct-899cb1"> } </span><span class="ct-7e743e">catch</span><span class="ct-899cb1"> (</span><span class="ct-7c8609">e</span><span class="ct-899cb1">) {</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7e743e">throw</span><span class="ct-899cb1"> </span><span class="ct-7e743e">new</span><span class="ct-899cb1"> </span><span class="ct-c5863c">Error</span><span class="ct-899cb1">(</span><span class="ct-7c8609">e</span><span class="ct-899cb1">);</span></span><span class="line"><span class="ct-899cb1"> }</span></span><span class="line"><span class="ct-899cb1"> </span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-e86127">// calling read method</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7e743e">try</span><span class="ct-899cb1"> {</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-e86127">// this method can return data</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-2111a2">const</span><span class="ct-899cb1"> </span><span class="ct-aa452a">result</span><span class="ct-899cb1"> </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> </span><span class="ct-7e743e">await</span><span class="ct-899cb1"> </span><span class="ct-7c8609">contract</span><span class="ct-899cb1">.</span><span class="ct-7c8609">methods</span><span class="ct-899cb1">.</span><span class="ct-98fc15">retrieve</span><span class="ct-899cb1">().</span><span class="ct-98fc15">call</span><span class="ct-899cb1">();</span></span><span class="line"><span class="ct-899cb1"> } </span><span class="ct-7e743e">catch</span><span class="ct-899cb1"> (</span><span class="ct-7c8609">e</span><span class="ct-899cb1">) {</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7e743e">throw</span><span class="ct-899cb1"> </span><span class="ct-7e743e">new</span><span class="ct-899cb1"> </span><span class="ct-c5863c">Error</span><span class="ct-899cb1">(</span><span class="ct-7c8609">e</span><span class="ct-899cb1">);</span></span><span class="line"><span class="ct-899cb1"> }</span></span><span class="line"><span class="ct-899cb1">}</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-e86127">// see example below</span></span><span class="line"><span class="ct-7e743e">import</span><span class="ct-899cb1"> { </span><span class="ct-7c8609">getContract</span><span class="ct-899cb1"> } </span><span class="ct-7e743e">from</span><span class="ct-899cb1"> </span><span class="ct-15fc19">'.'</span><span class="ct-899cb1">;</span></span><span class="line"></span><span class="line"><span class="ct-e86127">// ABI контракта</span></span><span class="line"><span class="ct-2111a2">const</span><span class="ct-899cb1"> </span><span class="ct-aa452a">CONTRACT_ABI</span><span class="ct-899cb1"> </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> { </span><span class="ct-e86127">/* ... */</span><span class="ct-899cb1"> };</span></span><span class="line"><span class="ct-e86127">// contract address</span></span><span class="line"><span class="ct-2111a2">const</span><span class="ct-899cb1"> </span><span class="ct-aa452a">CONTRACT_ADDRESS</span><span class="ct-899cb1"> </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> </span><span class="ct-15fc19">'0xdea164f67df4dbfe675d5271c9d404e0260f33bb'</span><span class="ct-899cb1">;</span></span><span class="line"><span class="ct-e86127">// getting contract</span></span><span class="line"><span class="ct-2111a2">const</span><span class="ct-899cb1"> </span><span class="ct-aa452a">contract</span><span class="ct-899cb1"> </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> </span><span class="ct-98fc15">getContract</span><span class="ct-899cb1">(</span><span class="ct-aa452a">CONTRACT_ABI</span><span class="ct-899cb1">, </span><span class="ct-aa452a">CONTRACT_ADDRESS</span><span class="ct-899cb1">);</span></span><span class="line"><span class="ct-e86127">// account's private key</span></span><span class="line"><span class="ct-2111a2">const</span><span class="ct-899cb1"> </span><span class="ct-aa452a">privateKey</span><span class="ct-899cb1"> </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> </span><span class="ct-15fc19">'...'</span><span class="ct-899cb1">;</span></span><span class="line"></span><span class="line"><span class="ct-e86127">// write-methods requires private key</span></span><span class="line"><span class="ct-46bcc9">const</span><span class="ct-32f53d"> </span><span class="ct-9de887">executeContractMethod</span><span class="ct-32f53d"> </span><span class="ct-11f4f9">=</span><span class="ct-32f53d"> </span><span class="ct-46bcc9">async</span><span class="ct-32f53d"> (</span><span class="ct-6aec93">val</span><span class="ct-11f4f9">:</span><span class="ct-32f53d"> </span><span class="ct-cff7b3">number</span><span class="ct-32f53d">) </span><span class="ct-46bcc9">=></span><span class="ct-32f53d"> {</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-2111a2">const</span><span class="ct-899cb1"> </span><span class="ct-aa452a">transaction</span><span class="ct-899cb1"> </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> </span><span class="ct-7c8609">contract</span><span class="ct-899cb1">.</span><span class="ct-7c8609">methods</span><span class="ct-899cb1">.</span><span class="ct-98fc15">store</span><span class="ct-899cb1">(</span><span class="ct-7c8609">val</span><span class="ct-899cb1">);</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-2111a2">const</span><span class="ct-899cb1"> </span><span class="ct-aa452a">account</span><span class="ct-899cb1"> </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> </span><span class="ct-7c8609">web3</span><span class="ct-899cb1">.</span><span class="ct-7c8609">eth</span><span class="ct-899cb1">.</span><span class="ct-7c8609">accounts</span><span class="ct-899cb1">.</span><span class="ct-98fc15">privateKeyToAccount</span><span class="ct-899cb1">(</span><span class="ct-7c8609">privateKey</span><span class="ct-899cb1">);</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-2111a2">const</span><span class="ct-899cb1"> </span><span class="ct-aa452a">options</span><span class="ct-899cb1"> </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> {</span></span><span class="line"><span class="ct-899cb1"> to: </span><span class="ct-aa452a">CONTRACT_ADDRESS</span><span class="ct-899cb1">,</span></span><span class="line"><span class="ct-899cb1"> data: </span><span class="ct-7c8609">transaction</span><span class="ct-899cb1">.</span><span class="ct-98fc15">encodeABI</span><span class="ct-899cb1">(),</span></span><span class="line"><span class="ct-899cb1"> gas: </span><span class="ct-7e743e">await</span><span class="ct-899cb1"> </span><span class="ct-7c8609">transaction</span><span class="ct-899cb1">.</span><span class="ct-98fc15">estimateGas</span><span class="ct-899cb1">({ from: </span><span class="ct-7c8609">account</span><span class="ct-899cb1">.</span><span class="ct-7c8609">address</span><span class="ct-899cb1"> }),</span></span><span class="line"><span class="ct-899cb1"> gasPrice: </span><span class="ct-7e743e">await</span><span class="ct-899cb1"> </span><span class="ct-7c8609">web3</span><span class="ct-899cb1">.</span><span class="ct-7c8609">eth</span><span class="ct-899cb1">.</span><span class="ct-98fc15">getGasPrice</span><span class="ct-899cb1">(),</span></span><span class="line"><span class="ct-899cb1"> };</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-2111a2">const</span><span class="ct-899cb1"> </span><span class="ct-aa452a">signed</span><span class="ct-899cb1"> </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> </span><span class="ct-7e743e">await</span><span class="ct-899cb1"> </span><span class="ct-7c8609">web3</span><span class="ct-899cb1">.</span><span class="ct-7c8609">eth</span><span class="ct-899cb1">.</span><span class="ct-7c8609">accounts</span><span class="ct-899cb1">.</span><span class="ct-98fc15">signTransaction</span><span class="ct-899cb1">(</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7c8609">options</span><span class="ct-899cb1">,</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7c8609">privateKey</span><span class="ct-899cb1">,</span></span><span class="line"><span class="ct-899cb1"> );</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7e743e">await</span><span class="ct-899cb1"> </span><span class="ct-7c8609">web3</span><span class="ct-899cb1">.</span><span class="ct-7c8609">eth</span><span class="ct-899cb1">.</span><span class="ct-98fc15">sendSignedTransaction</span><span class="ct-899cb1">(</span><span class="ct-7c8609">signed</span><span class="ct-899cb1">.</span><span class="ct-7c8609">rawTransaction</span><span class="ct-7e743e">!</span><span class="ct-899cb1">);</span></span><span class="line"><span class="ct-899cb1">};</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-899cb1"> </span><span class="ct-2111a2">const</span><span class="ct-899cb1"> </span><span class="ct-aa452a">requests</span><span class="ct-899cb1"> </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> [</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7c8609">contract</span><span class="ct-899cb1">.</span><span class="ct-7c8609">method</span><span class="ct-899cb1">.</span><span class="ct-98fc15">balanceOf</span><span class="ct-899cb1">().</span><span class="ct-7c8609">call</span><span class="ct-899cb1">,</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7c8609">contract</span><span class="ct-899cb1">.</span><span class="ct-7c8609">method</span><span class="ct-899cb1">.</span><span class="ct-98fc15">getStaked</span><span class="ct-899cb1">().</span><span class="ct-7c8609">call</span></span><span class="line"><span class="ct-899cb1"> ]</span></span><span class="line"></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-2111a2">const</span><span class="ct-899cb1"> </span><span class="ct-aa452a">result</span><span class="ct-899cb1"> </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> </span><span class="ct-7e743e">await</span><span class="ct-899cb1"> </span><span class="ct-98fc15">makeBatchRequest</span><span class="ct-899cb1">(</span><span class="ct-7c8609">request</span><span class="ct-899cb1">);</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-2111a2">const</span><span class="ct-899cb1"> </span><span class="ct-aa452a">web3</span><span class="ct-899cb1"> </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> </span><span class="ct-7e743e">new</span><span class="ct-899cb1"> </span><span class="ct-98fc15">Web3</span><span class="ct-899cb1">(</span><span class="ct-7c8609">Web3</span><span class="ct-899cb1">.</span><span class="ct-7c8609">givenProvider</span><span class="ct-899cb1"> </span><span class="ct-7e743e">||</span><span class="ct-899cb1"> </span><span class="ct-aa452a">PROVIDER_URL</span><span class="ct-899cb1">);</span></span><span class="line"></span><span class="line"><span class="ct-46bcc9">const</span><span class="ct-32f53d"> </span><span class="ct-9de887">makeBatchRequest</span><span class="ct-32f53d"> </span><span class="ct-11f4f9">=</span><span class="ct-32f53d"> (</span><span class="ct-6aec93">calls</span><span class="ct-11f4f9">:</span><span class="ct-32f53d"> </span><span class="ct-cff7b3">any</span><span class="ct-32f53d">[]) </span><span class="ct-46bcc9">=></span><span class="ct-32f53d"> {</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7e743e">try</span><span class="ct-899cb1"> {</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-2111a2">const</span><span class="ct-899cb1"> </span><span class="ct-aa452a">web3</span><span class="ct-899cb1"> </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> </span><span class="ct-98fc15">getWeb3NoAccount</span><span class="ct-899cb1">();</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-2111a2">const</span><span class="ct-899cb1"> </span><span class="ct-aa452a">batch</span><span class="ct-899cb1"> </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> </span><span class="ct-7e743e">new</span><span class="ct-899cb1"> </span><span class="ct-7c8609">web3</span><span class="ct-899cb1">.</span><span class="ct-98fc15">BatchRequest</span><span class="ct-899cb1">();</span></span><span class="line"></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-2111a2">const</span><span class="ct-899cb1"> </span><span class="ct-aa452a">promises</span><span class="ct-899cb1"> </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> </span><span class="ct-7c8609">calls</span><span class="ct-899cb1">.</span><span class="ct-98fc15">map</span><span class="ct-2111a2">=></span><span class="ct-899cb1"> {</span></span><span class="line"><span class="ct-32f53d"> </span><span class="ct-11f4f9">return</span><span class="ct-32f53d"> </span><span class="ct-11f4f9">new</span><span class="ct-32f53d"> </span><span class="ct-cff7b3">Promise</span><span class="ct-32f53d">((</span><span class="ct-6aec93">resolve</span><span class="ct-32f53d">, </span><span class="ct-6aec93">reject</span><span class="ct-32f53d">) </span><span class="ct-46bcc9">=></span><span class="ct-32f53d"> {</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7c8609">batch</span><span class="ct-899cb1">.</span><span class="ct-98fc15">add</span><span class="ct-899cb1">(</span></span><span class="line"></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7e743e">if</span><span class="ct-899cb1"> (</span><span class="ct-7c8609">err</span><span class="ct-899cb1">) {</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-98fc15">reject</span><span class="ct-899cb1">(</span><span class="ct-7c8609">err</span><span class="ct-899cb1">);</span></span><span class="line"><span class="ct-899cb1"> } </span><span class="ct-7e743e">else</span><span class="ct-899cb1"> {</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-98fc15">resolve</span><span class="ct-899cb1">(</span><span class="ct-7c8609">result</span><span class="ct-899cb1">);</span></span><span class="line"><span class="ct-899cb1"> }</span></span><span class="line"><span class="ct-899cb1"> })</span></span><span class="line"><span class="ct-899cb1"> );</span></span><span class="line"><span class="ct-899cb1"> });</span></span><span class="line"><span class="ct-899cb1"> });</span></span><span class="line"></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7c8609">batch</span><span class="ct-899cb1">.</span><span class="ct-98fc15">execute</span><span class="ct-899cb1">();</span></span><span class="line"></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7e743e">return</span><span class="ct-899cb1"> </span><span class="ct-c5863c">Promise</span><span class="ct-899cb1">.</span><span class="ct-98fc15">all</span><span class="ct-899cb1">(</span><span class="ct-7c8609">promises</span><span class="ct-899cb1">);</span></span><span class="line"><span class="ct-899cb1"> } </span><span class="ct-7e743e">catch</span><span class="ct-899cb1"> {</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7e743e">return</span><span class="ct-899cb1"> </span><span class="ct-fb6f76">null</span><span class="ct-899cb1">;</span></span><span class="line"><span class="ct-899cb1"> }</span></span><span class="line"><span class="ct-899cb1">};</span></span><span class="line"></span><span class="line"><span class="ct-7e743e">export</span><span class="ct-e1aed8"> </span><span class="ct-7e743e">default</span><span class="ct-e1aed8"> </span><span class="ct-7c8609">makeBatchRequest</span><span class="ct-899cb1">;</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-899cb1"> </span><span class="ct-7e743e">import</span><span class="ct-899cb1"> </span><span class="ct-7c8609">Web3</span><span class="ct-899cb1"> </span><span class="ct-7e743e">from</span><span class="ct-899cb1"> </span><span class="ct-15fc19">'web3'</span><span class="ct-899cb1">;</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-2111a2">const</span><span class="ct-899cb1"> </span><span class="ct-aa452a">web3</span><span class="ct-899cb1"> </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> </span><span class="ct-7e743e">new</span><span class="ct-899cb1"> </span><span class="ct-98fc15">Web3</span><span class="ct-899cb1">(</span><span class="ct-15fc19">'YOUR_RPC_ENDPOINT_HERE'</span><span class="ct-899cb1">);</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-2111a2">const</span><span class="ct-899cb1"> </span><span class="ct-aa452a">ABI</span><span class="ct-899cb1"> </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> </span><span class="ct-15fc19">'YOUR ABI HERE'</span><span class="ct-899cb1">;</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-2111a2">const</span><span class="ct-899cb1"> </span><span class="ct-aa452a">CONTRACT_ADDRESS</span><span class="ct-899cb1"> </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> </span><span class="ct-15fc19">'YOUR CONTRACT ADDRESS HERE'</span><span class="ct-899cb1">;</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-2111a2">const</span><span class="ct-899cb1"> </span><span class="ct-aa452a">myContract</span><span class="ct-899cb1"> </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> </span><span class="ct-7e743e">new</span><span class="ct-899cb1"> </span><span class="ct-7c8609">Web3</span><span class="ct-899cb1">.</span><span class="ct-98fc15">Contract</span><span class="ct-899cb1">(</span><span class="ct-aa452a">ABI</span><span class="ct-899cb1">, </span><span class="ct-aa452a">CONTRACT_ADDRESS</span><span class="ct-899cb1">);</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-7c8609">referralProgramContract</span><span class="ct-899cb1">.</span><span class="ct-7c8609">events</span></span><span class="line"><span class="ct-899cb1"> .</span><span class="ct-98fc15">RegisterUser</span><span class="ct-899cb1">()</span></span><span class="line"><span class="ct-32f53d"> .</span><span class="ct-9de887">on</span><span class="ct-32f53d">(</span><span class="ct-76bc6a">'connected'</span><span class="ct-32f53d">, (</span><span class="ct-6aec93">subscriptionId</span><span class="ct-11f4f9">:</span><span class="ct-32f53d"> </span><span class="ct-cff7b3">string</span><span class="ct-32f53d">) </span><span class="ct-46bcc9">=></span><span class="ct-32f53d"> {</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7c8609">console</span><span class="ct-899cb1">.</span><span class="ct-98fc15">log</span><span class="ct-899cb1">(</span><span class="ct-15fc19">`| UserRegistered | events | ${</span><span class="ct-7c8609">subscriptionId</span><span class="ct-15fc19">}`</span><span class="ct-899cb1">);</span></span><span class="line"><span class="ct-899cb1"> })</span></span><span class="line"><span class="ct-899cb1"> .</span><span class="ct-98fc15">on</span><span class="ct-899cb1">(</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-15fc19">'data'</span><span class="ct-899cb1">,</span></span><span class="line"><span class="ct-32f53d"> </span><span class="ct-46bcc9">async</span><span class="ct-32f53d"> (</span><span class="ct-6aec93">event</span><span class="ct-11f4f9">:</span><span class="ct-32f53d"> {</span></span><span class="line"><span class="ct-32f53d"> </span><span class="ct-6aec93">removed</span><span class="ct-11f4f9">:</span><span class="ct-32f53d"> </span><span class="ct-cff7b3">boolean</span><span class="ct-32f53d">;</span></span><span class="line"><span class="ct-32f53d"> </span><span class="ct-6aec93">returnValues</span><span class="ct-11f4f9">:</span><span class="ct-32f53d"> </span><span class="ct-1830b9">RegisterUserResponseInterface</span><span class="ct-32f53d">;</span></span><span class="line"><span class="ct-899cb1"> }) </span><span class="ct-2111a2">=></span><span class="ct-899cb1"> {</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7e743e">try</span><span class="ct-899cb1"> {</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7e743e">if</span><span class="ct-899cb1"> (</span><span class="ct-7c8609">event</span><span class="ct-899cb1">.</span><span class="ct-7c8609">removed</span><span class="ct-899cb1">) {</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7e743e">return</span><span class="ct-899cb1">;</span></span><span class="line"><span class="ct-899cb1"> }</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-2111a2">const</span><span class="ct-899cb1"> { </span><span class="ct-aa452a">user</span><span class="ct-899cb1">, </span><span class="ct-aa452a">referrer</span><span class="ct-899cb1"> } </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> </span><span class="ct-7c8609">event</span><span class="ct-899cb1">.</span><span class="ct-7c8609">returnValues</span><span class="ct-899cb1">;</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7c8609">console</span><span class="ct-899cb1">.</span><span class="ct-98fc15">log</span><span class="ct-899cb1">(</span><span class="ct-7c8609">user</span><span class="ct-899cb1">, </span><span class="ct-7c8609">referrer</span><span class="ct-899cb1">);</span></span><span class="line"><span class="ct-899cb1"> } </span><span class="ct-7e743e">catch</span><span class="ct-899cb1"> (</span><span class="ct-7c8609">e</span><span class="ct-899cb1">) {</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7c8609">console</span><span class="ct-899cb1">.</span><span class="ct-98fc15">log</span><span class="ct-899cb1">(</span><span class="ct-15fc19">`| ONCE | ${</span><span class="ct-7c8609">e</span><span class="ct-15fc19">}`</span><span class="ct-899cb1">);</span></span><span class="line"><span class="ct-899cb1"> }</span></span><span class="line"><span class="ct-899cb1"> },</span></span><span class="line"><span class="ct-899cb1"> )</span></span><span class="line"><span class="ct-32f53d"> .</span><span class="ct-9de887">on</span><span class="ct-32f53d">(</span><span class="ct-76bc6a">'error'</span><span class="ct-32f53d">, (</span><span class="ct-6aec93">error</span><span class="ct-11f4f9">:</span><span class="ct-32f53d"> </span><span class="ct-1830b9">ErrnoException</span><span class="ct-32f53d">) </span><span class="ct-46bcc9">=></span><span class="ct-32f53d"> {</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7c8609">console</span><span class="ct-899cb1">.</span><span class="ct-98fc15">log</span><span class="ct-899cb1">(</span><span class="ct-7c8609">error</span><span class="ct-899cb1">);</span></span><span class="line"><span class="ct-899cb1"> });</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-899cb1"> </span><span class="ct-2111a2">let</span><span class="ct-899cb1"> </span><span class="ct-7c8609">options</span><span class="ct-899cb1"> </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> {</span></span><span class="line"><span class="ct-899cb1"> filter: {</span></span><span class="line"><span class="ct-899cb1"> value: [],</span></span><span class="line"><span class="ct-899cb1"> },</span></span><span class="line"><span class="ct-899cb1"> fromBlock: </span><span class="ct-6a817f">0</span></span><span class="line"><span class="ct-899cb1"> };</span></span><span class="line"></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7c8609">myContract</span><span class="ct-899cb1">.</span><span class="ct-7c8609">events</span><span class="ct-899cb1">.</span><span class="ct-98fc15">Transfer</span><span class="ct-899cb1">(</span><span class="ct-7c8609">options</span><span class="ct-899cb1">)</span></span><span class="line"><span class="ct-899cb1"> .</span><span class="ct-98fc15">on</span><span class="ct-899cb1">(</span><span class="ct-15fc19">'data'</span><span class="ct-899cb1"> </span><span class="ct-98fc15">log</span><span class="ct-899cb1">(</span><span class="ct-7c8609">event</span><span class="ct-899cb1">))</span></span><span class="line"><span class="ct-899cb1"> .</span><span class="ct-98fc15">on</span><span class="ct-899cb1">(</span><span class="ct-15fc19">'changed'</span><span class="ct-899cb1"> </span><span class="ct-98fc15">log</span><span class="ct-899cb1">(</span><span class="ct-7c8609">changed</span><span class="ct-899cb1">))</span></span><span class="line"><span class="ct-899cb1"> .</span><span class="ct-98fc15">on</span><span class="ct-899cb1">(</span><span class="ct-15fc19">'error'</span><span class="ct-899cb1"> </span></span><span class="line"><span class="ct-899cb1"> .</span><span class="ct-98fc15">on</span><span class="ct-899cb1">(</span><span class="ct-15fc19">'connected'</span><span class="ct-899cb1"> </span><span class="ct-98fc15">log</span><span class="ct-899cb1">(</span><span class="ct-7c8609">str</span><span class="ct-899cb1">))</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-899cb1"> </span><span class="ct-2111a2">let</span><span class="ct-899cb1"> </span><span class="ct-7c8609">options</span><span class="ct-899cb1"> </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> {</span></span><span class="line"><span class="ct-899cb1"> fromBlock: </span><span class="ct-6a817f">0</span><span class="ct-899cb1">,</span></span><span class="line"><span class="ct-899cb1"> address: [</span><span class="ct-15fc19">'address-1'</span><span class="ct-899cb1">, </span><span class="ct-15fc19">'address-2'</span><span class="ct-899cb1">], </span><span class="ct-e86127">//Only get events from specific addresses</span></span><span class="line"><span class="ct-899cb1"> topics: [] </span><span class="ct-e86127">//What topics to subscribe to</span></span><span class="line"><span class="ct-899cb1"> };</span></span><span class="line"></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-2111a2">let</span><span class="ct-899cb1"> </span><span class="ct-7c8609">subscription</span><span class="ct-899cb1"> </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> (</span><span class="ct-15fc19">'logs'</span><span class="ct-899cb1">, </span><span class="ct-7c8609">options</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7e743e">if</span><span class="ct-899cb1"> (</span><span class="ct-7e743e">!</span><span class="ct-7c8609">err</span><span class="ct-899cb1">)</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7c8609">console</span><span class="ct-899cb1">.</span><span class="ct-98fc15">log</span><span class="ct-899cb1">(</span><span class="ct-7c8609">event</span><span class="ct-899cb1">)</span></span><span class="line"><span class="ct-899cb1"> });</span></span><span class="line"></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7c8609">subscription</span><span class="ct-899cb1">.</span><span class="ct-98fc15">on</span><span class="ct-899cb1">(</span><span class="ct-15fc19">'data'</span><span class="ct-2111a2">=></span><span class="ct-899cb1"> </span><span class="ct-7c8609">console</span><span class="ct-899cb1">.</span><span class="ct-98fc15">log</span><span class="ct-899cb1">(</span><span class="ct-7c8609">event</span><span class="ct-899cb1">))</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7c8609">subscription</span><span class="ct-899cb1">.</span><span class="ct-98fc15">on</span><span class="ct-899cb1">(</span><span class="ct-15fc19">'changed'</span><span class="ct-2111a2">=></span><span class="ct-899cb1"> </span><span class="ct-7c8609">console</span><span class="ct-899cb1">.</span><span class="ct-98fc15">log</span><span class="ct-899cb1">(</span><span class="ct-7c8609">changed</span><span class="ct-899cb1">))</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7c8609">subscription</span><span class="ct-899cb1">.</span><span class="ct-98fc15">on</span><span class="ct-899cb1">(</span><span class="ct-15fc19">'error'</span><span class="ct-2111a2">=></span><span class="ct-899cb1"> { </span><span class="ct-7e743e">throw</span><span class="ct-899cb1"> </span><span class="ct-7c8609">err</span><span class="ct-899cb1"> })</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7c8609">subscription</span><span class="ct-899cb1">.</span><span class="ct-98fc15">on</span><span class="ct-899cb1">(</span><span class="ct-15fc19">'connected'</span><span class="ct-2111a2">=></span><span class="ct-899cb1"> </span><span class="ct-7c8609">console</span><span class="ct-899cb1">.</span><span class="ct-98fc15">log</span><span class="ct-899cb1">(</span><span class="ct-7c8609">nr</span><span class="ct-899cb1">))</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-899cb1"> </span><span class="ct-e86127">//example options(optional)</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-2111a2">let</span><span class="ct-899cb1"> </span><span class="ct-7c8609">options</span><span class="ct-899cb1"> </span><span class="ct-7e743e">=</span><span class="ct-899cb1"> {</span></span><span class="line"><span class="ct-899cb1"> filter: {</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-e86127">// only get events where transfer value was 1000 or 1337</span></span><span class="line"><span class="ct-899cb1"> value: [</span><span class="ct-15fc19">'1000'</span><span class="ct-899cb1">, </span><span class="ct-15fc19">'1337'</span><span class="ct-899cb1">] </span></span><span class="line"><span class="ct-899cb1"> },</span></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-e86127">// number | "earliest" | "pending" | "latest"</span></span><span class="line"><span class="ct-899cb1"> fromBlock: </span><span class="ct-6a817f">0</span><span class="ct-899cb1">, </span></span><span class="line"><span class="ct-899cb1"> toBlock: </span><span class="ct-15fc19">'latest'</span></span><span class="line"><span class="ct-899cb1"> };</span></span><span class="line"></span><span class="line"><span class="ct-899cb1"> </span><span class="ct-7c8609">myContract</span><span class="ct-899cb1">.</span><span class="ct-98fc15">getPastEvents</span><span class="ct-899cb1">(</span><span class="ct-15fc19">'Transfer'</span><span class="ct-899cb1">, </span><span class="ct-7c8609">options</span><span class="ct-899cb1">)</span></span><span class="line"><span class="ct-899cb1"> .</span><span class="ct-98fc15">then</span><span class="ct-899cb1"> </span><span class="ct-98fc15">log</span><span class="ct-899cb1">(</span><span class="ct-7c8609">results</span><span class="ct-899cb1">))</span></span><span class="line"><span class="ct-899cb1"> .</span><span class="ct-98fc15">catch</span><span class="ct-899cb1"> </span></span></code></pre><!--]--></div><style>.ct-1830b9{color:#FFA657}.ct-76bc6a{color:#A5D6FF}.ct-fb6f76{color:#79C0FF}.ct-c5863c{color:#79C0FF}.ct-6a817f{color:#79C0FF}.ct-aa452a{color:#79C0FF}.ct-2111a2{color:#FF7B72}.ct-e86127{color:#8B949E}.ct-e1aed8{color:#FFA657}.ct-98fc15{color:#D2A8FF}.ct-0eb029{color:#79C0FF}.ct-42c20d{color:#79C0FF}.ct-cff7b3{color:#79C0FF}.ct-6aec93{color:#FFA657}.ct-11f4f9{color:#FF7B72}.ct-9de887{color:#D2A8FF}.ct-32f53d{color:#C9D1D9}.ct-46bcc9{color:#FF7B72}.ct-15fc19{color:#A5D6FF}.ct-7c8609{color:#C9D1D9}.ct-899cb1{color:#C9D1D9}.ct-7e743e{color:#FF7B72}.light .ct-7e743e{color:#859900}.light .ct-899cb1{color:#657B83}.light .ct-7c8609{color:#268BD2}.light .ct-15fc19{color:#2AA198}.light .ct-46bcc9{color:#073642}.light .ct-32f53d{color:#657B83}.light .ct-9de887{color:#268BD2}.light .ct-11f4f9{color:#859900}.light .ct-6aec93{color:#657B83}.light .ct-cff7b3{color:#859900}.light .ct-42c20d{color:#268BD2}.light .ct-0eb029{color:#657B83}.light .ct-98fc15{color:#268BD2}.light .ct-e1aed8{color:#657B83}.light .ct-e86127{color:#93A1A1}.light .ct-2111a2{color:#073642}.light .ct-aa452a{color:#268BD2}.light .ct-6a817f{color:#D33682}.light .ct-c5863c{color:#859900}.light .ct-fb6f76{color:#B58900}.light .ct-76bc6a{color:#2AA198}.light .ct-1830b9{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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