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_theme_toggle_1km9a_23"><span></span></button><!--[--><!--[--><main class="_content_1gz79_1"><!--[--><h1>Smart Contracts</h1><article><div><p><!--[-->For common functions see <a href="/blockchain/common-typescript-examples" class=""><!--[-->Common typescript examples<!--]--></a>.<!--]--></p><h2 id="getting-smart-contract-instance"><a href="#getting-smart-contract-instance"><!--[-->Getting smart contract instance<!--]--></a></h2><p><!--[-->Useful for calling smart contract methods:<!--]--></p><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>typescript</span></button><!--[--><pre><code><span class="line"><span class="ct-a49a53">import</span><span class="ct-647ed6"> { </span><span class="ct-52bc93">Contract</span><span class="ct-647ed6"> } </span><span class="ct-a49a53">from</span><span class="ct-647ed6"> </span><span class="ct-668f90">'web3-eth-contract'</span><span class="ct-647ed6">;</span></span><span class="line"><span class="ct-a49a53">import</span><span class="ct-647ed6"> { </span><span class="ct-52bc93">web3</span><span class="ct-647ed6"> } </span><span class="ct-a49a53">from</span><span class="ct-647ed6"> </span><span class="ct-668f90">'.'</span><span class="ct-647ed6">;</span></span><span class="line"></span><span class="line"><span class="ct-161fb2">const</span><span class="ct-dbf423"> </span><span class="ct-3d5a95">getContract</span><span class="ct-dbf423"> </span><span class="ct-5b11b7">=</span><span class="ct-dbf423"> (</span><span class="ct-bd4d1d">abi</span><span class="ct-5b11b7">:</span><span class="ct-dbf423"> </span><span class="ct-176f77">object</span><span class="ct-dbf423">, </span><span class="ct-bd4d1d">address</span><span class="ct-5b11b7">?:</span><span class="ct-dbf423"> </span><span class="ct-176f77">string</span><span class="ct-dbf423">)</span><span class="ct-5b11b7">:</span><span class="ct-dbf423"> </span><span class="ct-161fb2">=></span><span class="ct-dbf423"> {</span></span><span class="line"><span class="ct-dbf423"> </span><span class="ct-161fb2">const</span><span class="ct-dbf423"> </span><span class="ct-790fa3">abiFromJson</span><span class="ct-dbf423"> </span><span class="ct-5b11b7">=</span><span class="ct-dbf423"> </span><span class="ct-c4aa7f">JSON</span><span class="ct-dbf423">.</span><span class="ct-790fa3">parse</span><span class="ct-dbf423">(</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-a49a53">return</span><span class="ct-647ed6"> </span><span class="ct-a49a53">new</span><span class="ct-647ed6"> </span><span class="ct-52bc93">web3</span><span class="ct-647ed6">.</span><span class="ct-52bc93">eth</span><span class="ct-647ed6">.</span><span class="ct-28eb49">Contract</span><span class="ct-647ed6">(</span><span class="ct-52bc93">abiFromJson</span><span class="ct-647ed6">, </span><span class="ct-52bc93">address</span><span class="ct-647ed6">);</span></span><span class="line"><span class="ct-647ed6">};</span></span><span class="line"></span><span class="line"><span class="ct-a49a53">export</span><span class="ct-64faeb"> </span><span class="ct-a49a53">default</span><span class="ct-64faeb"> </span><span class="ct-52bc93">getContract</span><span class="ct-647ed6">;</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-95eeb3">// see example below</span></span><span class="line"><span class="ct-a49a53">import</span><span class="ct-647ed6"> { </span><span class="ct-52bc93">getContract</span><span class="ct-647ed6"> } </span><span class="ct-a49a53">from</span><span class="ct-647ed6"> </span><span class="ct-668f90">'.'</span><span class="ct-647ed6">;</span></span><span class="line"></span><span class="line"><span class="ct-95eeb3">// ABI of contract</span></span><span class="line"><span class="ct-1e0e69">const</span><span class="ct-647ed6"> </span><span class="ct-becaca">CONTRACT_ABI</span><span class="ct-647ed6"> </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> { </span><span class="ct-95eeb3">/* ... */</span><span class="ct-647ed6"> };</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-95eeb3">// address for contract</span></span><span class="line"><span class="ct-1e0e69">const</span><span class="ct-647ed6"> </span><span class="ct-becaca">CONTRACT_ADDRESS</span><span class="ct-647ed6"> </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> </span><span class="ct-668f90">'0xdea164f67df4dbfe675d5271c9d404e0260f33bb'</span><span class="ct-647ed6">;</span></span><span class="line"></span><span class="line"><span class="ct-a49a53">export</span><span class="ct-647ed6"> </span><span class="ct-1e0e69">const</span><span class="ct-647ed6"> </span><span class="ct-28eb49">executeContractMethod</span><span class="ct-647ed6"> </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> </span><span class="ct-1e0e69">async</span><span class="ct-647ed6"> ({}) </span><span class="ct-1e0e69">=></span><span class="ct-647ed6"> {</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-95eeb3">// getting contract</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-1e0e69">const</span><span class="ct-647ed6"> </span><span class="ct-becaca">contract</span><span class="ct-647ed6"> </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> </span><span class="ct-28eb49">getContract</span><span class="ct-647ed6">(</span><span class="ct-becaca">CONTRACT_ABI</span><span class="ct-647ed6">, </span><span class="ct-becaca">CONTRACT_ADDRESS</span><span class="ct-647ed6">);</span></span><span class="line"><span class="ct-647ed6"> </span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-95eeb3">// Calling write method</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-a49a53">try</span><span class="ct-647ed6"> {</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-95eeb3">// authorizing with Metamask</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-a49a53">await</span><span class="ct-647ed6"> </span><span class="ct-52bc93">web3</span><span class="ct-647ed6">.</span><span class="ct-52bc93">currentProvider</span><span class="ct-647ed6">.</span><span class="ct-28eb49">request</span><span class="ct-647ed6">({ method: </span><span class="ct-668f90">'eth_requestAccounts'</span><span class="ct-647ed6"> });</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-95eeb3">// getting wallet address</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-1e0e69">const</span><span class="ct-647ed6"> </span><span class="ct-becaca">addressUser</span><span class="ct-647ed6"> </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> </span><span class="ct-52bc93">web3</span><span class="ct-647ed6">.</span><span class="ct-52bc93">currentProvider</span><span class="ct-647ed6">.</span><span class="ct-52bc93">selectedAddress</span><span class="ct-647ed6">;</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-95eeb3">// calling "store" store method for contract</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-95eeb3">// payload should include `from` address, that matches</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-95eeb3">// current user's wallet</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-a49a53">await</span><span class="ct-647ed6"> </span><span class="ct-52bc93">contract</span><span class="ct-647ed6">.</span><span class="ct-52bc93">methods</span><span class="ct-647ed6">.</span><span class="ct-28eb49">store</span><span class="ct-647ed6">(</span><span class="ct-de18c8">0</span><span class="ct-647ed6">, </span><span class="ct-668f90">'Parameter'</span><span class="ct-647ed6">).</span><span class="ct-28eb49">send</span><span class="ct-647ed6">({</span></span><span class="line"><span class="ct-647ed6"> from: </span><span class="ct-52bc93">addressUser</span><span class="ct-647ed6">,</span></span><span class="line"><span class="ct-647ed6"> });</span></span><span class="line"><span class="ct-647ed6"> } </span><span class="ct-a49a53">catch</span><span class="ct-647ed6"> (</span><span class="ct-52bc93">e</span><span class="ct-647ed6">) {</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-a49a53">throw</span><span class="ct-647ed6"> </span><span class="ct-a49a53">new</span><span class="ct-647ed6"> </span><span class="ct-dfe1b7">Error</span><span class="ct-647ed6">(</span><span class="ct-52bc93">e</span><span class="ct-647ed6">);</span></span><span class="line"><span class="ct-647ed6"> }</span></span><span class="line"><span class="ct-647ed6"> </span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-95eeb3">// calling read method</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-a49a53">try</span><span class="ct-647ed6"> {</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-95eeb3">// this method can return data</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-1e0e69">const</span><span class="ct-647ed6"> </span><span class="ct-becaca">result</span><span class="ct-647ed6"> </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> </span><span class="ct-a49a53">await</span><span class="ct-647ed6"> </span><span class="ct-52bc93">contract</span><span class="ct-647ed6">.</span><span class="ct-52bc93">methods</span><span class="ct-647ed6">.</span><span class="ct-28eb49">retrieve</span><span class="ct-647ed6">().</span><span class="ct-28eb49">call</span><span class="ct-647ed6">();</span></span><span class="line"><span class="ct-647ed6"> } </span><span class="ct-a49a53">catch</span><span class="ct-647ed6"> (</span><span class="ct-52bc93">e</span><span class="ct-647ed6">) {</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-a49a53">throw</span><span class="ct-647ed6"> </span><span class="ct-a49a53">new</span><span class="ct-647ed6"> </span><span class="ct-dfe1b7">Error</span><span class="ct-647ed6">(</span><span class="ct-52bc93">e</span><span class="ct-647ed6">);</span></span><span class="line"><span class="ct-647ed6"> }</span></span><span class="line"><span class="ct-647ed6">}</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-95eeb3">// see example below</span></span><span class="line"><span class="ct-a49a53">import</span><span class="ct-647ed6"> { </span><span class="ct-52bc93">getContract</span><span class="ct-647ed6"> } </span><span class="ct-a49a53">from</span><span class="ct-647ed6"> </span><span class="ct-668f90">'.'</span><span class="ct-647ed6">;</span></span><span class="line"></span><span class="line"><span class="ct-95eeb3">// ABI контракта</span></span><span class="line"><span class="ct-1e0e69">const</span><span class="ct-647ed6"> </span><span class="ct-becaca">CONTRACT_ABI</span><span class="ct-647ed6"> </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> { </span><span class="ct-95eeb3">/* ... */</span><span class="ct-647ed6"> };</span></span><span class="line"><span class="ct-95eeb3">// contract address</span></span><span class="line"><span class="ct-1e0e69">const</span><span class="ct-647ed6"> </span><span class="ct-becaca">CONTRACT_ADDRESS</span><span class="ct-647ed6"> </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> </span><span class="ct-668f90">'0xdea164f67df4dbfe675d5271c9d404e0260f33bb'</span><span class="ct-647ed6">;</span></span><span class="line"><span class="ct-95eeb3">// getting contract</span></span><span class="line"><span class="ct-1e0e69">const</span><span class="ct-647ed6"> </span><span class="ct-becaca">contract</span><span class="ct-647ed6"> </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> </span><span class="ct-28eb49">getContract</span><span class="ct-647ed6">(</span><span class="ct-becaca">CONTRACT_ABI</span><span class="ct-647ed6">, </span><span class="ct-becaca">CONTRACT_ADDRESS</span><span class="ct-647ed6">);</span></span><span class="line"><span class="ct-95eeb3">// account's private key</span></span><span class="line"><span class="ct-1e0e69">const</span><span class="ct-647ed6"> </span><span class="ct-becaca">privateKey</span><span class="ct-647ed6"> </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> </span><span class="ct-668f90">'...'</span><span class="ct-647ed6">;</span></span><span class="line"></span><span class="line"><span class="ct-95eeb3">// write-methods requires private key</span></span><span class="line"><span class="ct-161fb2">const</span><span class="ct-dbf423"> </span><span class="ct-3d5a95">executeContractMethod</span><span class="ct-dbf423"> </span><span class="ct-5b11b7">=</span><span class="ct-dbf423"> </span><span class="ct-161fb2">async</span><span class="ct-dbf423"> (</span><span class="ct-bd4d1d">val</span><span class="ct-5b11b7">:</span><span class="ct-dbf423"> </span><span class="ct-176f77">number</span><span class="ct-dbf423">) </span><span class="ct-161fb2">=></span><span class="ct-dbf423"> {</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-1e0e69">const</span><span class="ct-647ed6"> </span><span class="ct-becaca">transaction</span><span class="ct-647ed6"> </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> </span><span class="ct-52bc93">contract</span><span class="ct-647ed6">.</span><span class="ct-52bc93">methods</span><span class="ct-647ed6">.</span><span class="ct-28eb49">store</span><span class="ct-647ed6">(</span><span class="ct-52bc93">val</span><span class="ct-647ed6">);</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-1e0e69">const</span><span class="ct-647ed6"> </span><span class="ct-becaca">account</span><span class="ct-647ed6"> </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> </span><span class="ct-52bc93">web3</span><span class="ct-647ed6">.</span><span class="ct-52bc93">eth</span><span class="ct-647ed6">.</span><span class="ct-52bc93">accounts</span><span class="ct-647ed6">.</span><span class="ct-28eb49">privateKeyToAccount</span><span class="ct-647ed6">(</span><span class="ct-52bc93">privateKey</span><span class="ct-647ed6">);</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-1e0e69">const</span><span class="ct-647ed6"> </span><span class="ct-becaca">options</span><span class="ct-647ed6"> </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> {</span></span><span class="line"><span class="ct-647ed6"> to: </span><span class="ct-becaca">CONTRACT_ADDRESS</span><span class="ct-647ed6">,</span></span><span class="line"><span class="ct-647ed6"> data: </span><span class="ct-52bc93">transaction</span><span class="ct-647ed6">.</span><span class="ct-28eb49">encodeABI</span><span class="ct-647ed6">(),</span></span><span class="line"><span class="ct-647ed6"> gas: </span><span class="ct-a49a53">await</span><span class="ct-647ed6"> </span><span class="ct-52bc93">transaction</span><span class="ct-647ed6">.</span><span class="ct-28eb49">estimateGas</span><span class="ct-647ed6">({ from: </span><span class="ct-52bc93">account</span><span class="ct-647ed6">.</span><span class="ct-52bc93">address</span><span class="ct-647ed6"> }),</span></span><span class="line"><span class="ct-647ed6"> gasPrice: </span><span class="ct-a49a53">await</span><span class="ct-647ed6"> </span><span class="ct-52bc93">web3</span><span class="ct-647ed6">.</span><span class="ct-52bc93">eth</span><span class="ct-647ed6">.</span><span class="ct-28eb49">getGasPrice</span><span class="ct-647ed6">(),</span></span><span class="line"><span class="ct-647ed6"> };</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-1e0e69">const</span><span class="ct-647ed6"> </span><span class="ct-becaca">signed</span><span class="ct-647ed6"> </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> </span><span class="ct-a49a53">await</span><span class="ct-647ed6"> </span><span class="ct-52bc93">web3</span><span class="ct-647ed6">.</span><span class="ct-52bc93">eth</span><span class="ct-647ed6">.</span><span class="ct-52bc93">accounts</span><span class="ct-647ed6">.</span><span class="ct-28eb49">signTransaction</span><span class="ct-647ed6">(</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-52bc93">options</span><span class="ct-647ed6">,</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-52bc93">privateKey</span><span class="ct-647ed6">,</span></span><span class="line"><span class="ct-647ed6"> );</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-a49a53">await</span><span class="ct-647ed6"> </span><span class="ct-52bc93">web3</span><span class="ct-647ed6">.</span><span class="ct-52bc93">eth</span><span class="ct-647ed6">.</span><span class="ct-28eb49">sendSignedTransaction</span><span class="ct-647ed6">(</span><span class="ct-52bc93">signed</span><span class="ct-647ed6">.</span><span class="ct-52bc93">rawTransaction</span><span class="ct-a49a53">!</span><span class="ct-647ed6">);</span></span><span class="line"><span class="ct-647ed6">};</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-647ed6"> </span><span class="ct-1e0e69">const</span><span class="ct-647ed6"> </span><span class="ct-becaca">requests</span><span class="ct-647ed6"> </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> [</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-52bc93">contract</span><span class="ct-647ed6">.</span><span class="ct-52bc93">method</span><span class="ct-647ed6">.</span><span class="ct-28eb49">balanceOf</span><span class="ct-647ed6">().</span><span class="ct-52bc93">call</span><span class="ct-647ed6">,</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-52bc93">contract</span><span class="ct-647ed6">.</span><span class="ct-52bc93">method</span><span class="ct-647ed6">.</span><span class="ct-28eb49">getStaked</span><span class="ct-647ed6">().</span><span class="ct-52bc93">call</span></span><span class="line"><span class="ct-647ed6"> ]</span></span><span class="line"></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-1e0e69">const</span><span class="ct-647ed6"> </span><span class="ct-becaca">result</span><span class="ct-647ed6"> </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> </span><span class="ct-a49a53">await</span><span class="ct-647ed6"> </span><span class="ct-28eb49">makeBatchRequest</span><span class="ct-647ed6">(</span><span class="ct-52bc93">request</span><span class="ct-647ed6">);</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-1e0e69">const</span><span class="ct-647ed6"> </span><span class="ct-becaca">web3</span><span class="ct-647ed6"> </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> </span><span class="ct-a49a53">new</span><span class="ct-647ed6"> </span><span class="ct-28eb49">Web3</span><span class="ct-647ed6">(</span><span class="ct-52bc93">Web3</span><span class="ct-647ed6">.</span><span class="ct-52bc93">givenProvider</span><span class="ct-647ed6"> </span><span class="ct-a49a53">||</span><span class="ct-647ed6"> </span><span class="ct-becaca">PROVIDER_URL</span><span class="ct-647ed6">);</span></span><span class="line"></span><span class="line"><span class="ct-161fb2">const</span><span class="ct-dbf423"> </span><span class="ct-3d5a95">makeBatchRequest</span><span class="ct-dbf423"> </span><span class="ct-5b11b7">=</span><span class="ct-dbf423"> (</span><span class="ct-bd4d1d">calls</span><span class="ct-5b11b7">:</span><span class="ct-dbf423"> </span><span class="ct-176f77">any</span><span class="ct-dbf423">[]) </span><span class="ct-161fb2">=></span><span class="ct-dbf423"> {</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-a49a53">try</span><span class="ct-647ed6"> {</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-1e0e69">const</span><span class="ct-647ed6"> </span><span class="ct-becaca">web3</span><span class="ct-647ed6"> </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> </span><span class="ct-28eb49">getWeb3NoAccount</span><span class="ct-647ed6">();</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-1e0e69">const</span><span class="ct-647ed6"> </span><span class="ct-becaca">batch</span><span class="ct-647ed6"> </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> </span><span class="ct-a49a53">new</span><span class="ct-647ed6"> </span><span class="ct-52bc93">web3</span><span class="ct-647ed6">.</span><span class="ct-28eb49">BatchRequest</span><span class="ct-647ed6">();</span></span><span class="line"></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-1e0e69">const</span><span class="ct-647ed6"> </span><span class="ct-becaca">promises</span><span class="ct-647ed6"> </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> </span><span class="ct-52bc93">calls</span><span class="ct-647ed6">.</span><span class="ct-28eb49">map</span><span class="ct-1e0e69">=></span><span class="ct-647ed6"> {</span></span><span class="line"><span class="ct-dbf423"> </span><span class="ct-5b11b7">return</span><span class="ct-dbf423"> </span><span class="ct-5b11b7">new</span><span class="ct-dbf423"> </span><span class="ct-176f77">Promise</span><span class="ct-dbf423">((</span><span class="ct-bd4d1d">resolve</span><span class="ct-dbf423">, </span><span class="ct-bd4d1d">reject</span><span class="ct-dbf423">) </span><span class="ct-161fb2">=></span><span class="ct-dbf423"> {</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-52bc93">batch</span><span class="ct-647ed6">.</span><span class="ct-28eb49">add</span><span class="ct-647ed6">(</span></span><span class="line"></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-a49a53">if</span><span class="ct-647ed6"> (</span><span class="ct-52bc93">err</span><span class="ct-647ed6">) {</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-28eb49">reject</span><span class="ct-647ed6">(</span><span class="ct-52bc93">err</span><span class="ct-647ed6">);</span></span><span class="line"><span class="ct-647ed6"> } </span><span class="ct-a49a53">else</span><span class="ct-647ed6"> {</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-28eb49">resolve</span><span class="ct-647ed6">(</span><span class="ct-52bc93">result</span><span class="ct-647ed6">);</span></span><span class="line"><span class="ct-647ed6"> }</span></span><span class="line"><span class="ct-647ed6"> })</span></span><span class="line"><span class="ct-647ed6"> );</span></span><span class="line"><span class="ct-647ed6"> });</span></span><span class="line"><span class="ct-647ed6"> });</span></span><span class="line"></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-52bc93">batch</span><span class="ct-647ed6">.</span><span class="ct-28eb49">execute</span><span class="ct-647ed6">();</span></span><span class="line"></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-a49a53">return</span><span class="ct-647ed6"> </span><span class="ct-dfe1b7">Promise</span><span class="ct-647ed6">.</span><span class="ct-28eb49">all</span><span class="ct-647ed6">(</span><span class="ct-52bc93">promises</span><span class="ct-647ed6">);</span></span><span class="line"><span class="ct-647ed6"> } </span><span class="ct-a49a53">catch</span><span class="ct-647ed6"> {</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-a49a53">return</span><span class="ct-647ed6"> </span><span class="ct-98c625">null</span><span class="ct-647ed6">;</span></span><span class="line"><span class="ct-647ed6"> }</span></span><span class="line"><span class="ct-647ed6">};</span></span><span class="line"></span><span class="line"><span class="ct-a49a53">export</span><span class="ct-64faeb"> </span><span class="ct-a49a53">default</span><span class="ct-64faeb"> </span><span class="ct-52bc93">makeBatchRequest</span><span class="ct-647ed6">;</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-647ed6"> </span><span class="ct-a49a53">import</span><span class="ct-647ed6"> </span><span class="ct-52bc93">Web3</span><span class="ct-647ed6"> </span><span class="ct-a49a53">from</span><span class="ct-647ed6"> </span><span class="ct-668f90">'web3'</span><span class="ct-647ed6">;</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-1e0e69">const</span><span class="ct-647ed6"> </span><span class="ct-becaca">web3</span><span class="ct-647ed6"> </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> </span><span class="ct-a49a53">new</span><span class="ct-647ed6"> </span><span class="ct-28eb49">Web3</span><span class="ct-647ed6">(</span><span class="ct-668f90">'YOUR_RPC_ENDPOINT_HERE'</span><span class="ct-647ed6">);</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-1e0e69">const</span><span class="ct-647ed6"> </span><span class="ct-becaca">ABI</span><span class="ct-647ed6"> </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> </span><span class="ct-668f90">'YOUR ABI HERE'</span><span class="ct-647ed6">;</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-1e0e69">const</span><span class="ct-647ed6"> </span><span class="ct-becaca">CONTRACT_ADDRESS</span><span class="ct-647ed6"> </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> </span><span class="ct-668f90">'YOUR CONTRACT ADDRESS HERE'</span><span class="ct-647ed6">;</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-1e0e69">const</span><span class="ct-647ed6"> </span><span class="ct-becaca">myContract</span><span class="ct-647ed6"> </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> </span><span class="ct-a49a53">new</span><span class="ct-647ed6"> </span><span class="ct-52bc93">Web3</span><span class="ct-647ed6">.</span><span class="ct-28eb49">Contract</span><span class="ct-647ed6">(</span><span class="ct-becaca">ABI</span><span class="ct-647ed6">, </span><span class="ct-becaca">CONTRACT_ADDRESS</span><span class="ct-647ed6">);</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-52bc93">referralProgramContract</span><span class="ct-647ed6">.</span><span class="ct-52bc93">events</span></span><span class="line"><span class="ct-647ed6"> .</span><span class="ct-28eb49">RegisterUser</span><span class="ct-647ed6">()</span></span><span class="line"><span class="ct-dbf423"> .</span><span class="ct-3d5a95">on</span><span class="ct-dbf423">(</span><span class="ct-301814">'connected'</span><span class="ct-dbf423">, (</span><span class="ct-bd4d1d">subscriptionId</span><span class="ct-5b11b7">:</span><span class="ct-dbf423"> </span><span class="ct-176f77">string</span><span class="ct-dbf423">) </span><span class="ct-161fb2">=></span><span class="ct-dbf423"> {</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-52bc93">console</span><span class="ct-647ed6">.</span><span class="ct-28eb49">log</span><span class="ct-647ed6">(</span><span class="ct-668f90">`| UserRegistered | events | ${</span><span class="ct-52bc93">subscriptionId</span><span class="ct-668f90">}`</span><span class="ct-647ed6">);</span></span><span class="line"><span class="ct-647ed6"> })</span></span><span class="line"><span class="ct-647ed6"> .</span><span class="ct-28eb49">on</span><span class="ct-647ed6">(</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-668f90">'data'</span><span class="ct-647ed6">,</span></span><span class="line"><span class="ct-dbf423"> </span><span class="ct-161fb2">async</span><span class="ct-dbf423"> (</span><span class="ct-bd4d1d">event</span><span class="ct-5b11b7">:</span><span class="ct-dbf423"> {</span></span><span class="line"><span class="ct-dbf423"> </span><span class="ct-bd4d1d">removed</span><span class="ct-5b11b7">:</span><span class="ct-dbf423"> </span><span class="ct-176f77">boolean</span><span class="ct-dbf423">;</span></span><span class="line"><span class="ct-dbf423"> </span><span class="ct-bd4d1d">returnValues</span><span class="ct-5b11b7">:</span><span class="ct-dbf423"> </span><span class="ct-69b377">RegisterUserResponseInterface</span><span class="ct-dbf423">;</span></span><span class="line"><span class="ct-647ed6"> }) </span><span class="ct-1e0e69">=></span><span class="ct-647ed6"> {</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-a49a53">try</span><span class="ct-647ed6"> {</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-a49a53">if</span><span class="ct-647ed6"> (</span><span class="ct-52bc93">event</span><span class="ct-647ed6">.</span><span class="ct-52bc93">removed</span><span class="ct-647ed6">) {</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-a49a53">return</span><span class="ct-647ed6">;</span></span><span class="line"><span class="ct-647ed6"> }</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-1e0e69">const</span><span class="ct-647ed6"> { </span><span class="ct-becaca">user</span><span class="ct-647ed6">, </span><span class="ct-becaca">referrer</span><span class="ct-647ed6"> } </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> </span><span class="ct-52bc93">event</span><span class="ct-647ed6">.</span><span class="ct-52bc93">returnValues</span><span class="ct-647ed6">;</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-52bc93">console</span><span class="ct-647ed6">.</span><span class="ct-28eb49">log</span><span class="ct-647ed6">(</span><span class="ct-52bc93">user</span><span class="ct-647ed6">, </span><span class="ct-52bc93">referrer</span><span class="ct-647ed6">);</span></span><span class="line"><span class="ct-647ed6"> } </span><span class="ct-a49a53">catch</span><span class="ct-647ed6"> (</span><span class="ct-52bc93">e</span><span class="ct-647ed6">) {</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-52bc93">console</span><span class="ct-647ed6">.</span><span class="ct-28eb49">log</span><span class="ct-647ed6">(</span><span class="ct-668f90">`| ONCE | ${</span><span class="ct-52bc93">e</span><span class="ct-668f90">}`</span><span class="ct-647ed6">);</span></span><span class="line"><span class="ct-647ed6"> }</span></span><span class="line"><span class="ct-647ed6"> },</span></span><span class="line"><span class="ct-647ed6"> )</span></span><span class="line"><span class="ct-dbf423"> .</span><span class="ct-3d5a95">on</span><span class="ct-dbf423">(</span><span class="ct-301814">'error'</span><span class="ct-dbf423">, (</span><span class="ct-bd4d1d">error</span><span class="ct-5b11b7">:</span><span class="ct-dbf423"> </span><span class="ct-69b377">ErrnoException</span><span class="ct-dbf423">) </span><span class="ct-161fb2">=></span><span class="ct-dbf423"> {</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-52bc93">console</span><span class="ct-647ed6">.</span><span class="ct-28eb49">log</span><span class="ct-647ed6">(</span><span class="ct-52bc93">error</span><span class="ct-647ed6">);</span></span><span class="line"><span class="ct-647ed6"> });</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-647ed6"> </span><span class="ct-1e0e69">let</span><span class="ct-647ed6"> </span><span class="ct-52bc93">options</span><span class="ct-647ed6"> </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> {</span></span><span class="line"><span class="ct-647ed6"> filter: {</span></span><span class="line"><span class="ct-647ed6"> value: [],</span></span><span class="line"><span class="ct-647ed6"> },</span></span><span class="line"><span class="ct-647ed6"> fromBlock: </span><span class="ct-de18c8">0</span></span><span class="line"><span class="ct-647ed6"> };</span></span><span class="line"></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-52bc93">myContract</span><span class="ct-647ed6">.</span><span class="ct-52bc93">events</span><span class="ct-647ed6">.</span><span class="ct-28eb49">Transfer</span><span class="ct-647ed6">(</span><span class="ct-52bc93">options</span><span class="ct-647ed6">)</span></span><span class="line"><span class="ct-647ed6"> .</span><span class="ct-28eb49">on</span><span class="ct-647ed6">(</span><span class="ct-668f90">'data'</span><span class="ct-647ed6"> </span><span class="ct-28eb49">log</span><span class="ct-647ed6">(</span><span class="ct-52bc93">event</span><span class="ct-647ed6">))</span></span><span class="line"><span class="ct-647ed6"> .</span><span class="ct-28eb49">on</span><span class="ct-647ed6">(</span><span class="ct-668f90">'changed'</span><span class="ct-647ed6"> </span><span class="ct-28eb49">log</span><span class="ct-647ed6">(</span><span class="ct-52bc93">changed</span><span class="ct-647ed6">))</span></span><span class="line"><span class="ct-647ed6"> .</span><span class="ct-28eb49">on</span><span class="ct-647ed6">(</span><span class="ct-668f90">'error'</span><span class="ct-647ed6"> </span></span><span class="line"><span class="ct-647ed6"> .</span><span class="ct-28eb49">on</span><span class="ct-647ed6">(</span><span class="ct-668f90">'connected'</span><span class="ct-647ed6"> </span><span class="ct-28eb49">log</span><span class="ct-647ed6">(</span><span class="ct-52bc93">str</span><span class="ct-647ed6">))</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-647ed6"> </span><span class="ct-1e0e69">let</span><span class="ct-647ed6"> </span><span class="ct-52bc93">options</span><span class="ct-647ed6"> </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> {</span></span><span class="line"><span class="ct-647ed6"> fromBlock: </span><span class="ct-de18c8">0</span><span class="ct-647ed6">,</span></span><span class="line"><span class="ct-647ed6"> address: [</span><span class="ct-668f90">'address-1'</span><span class="ct-647ed6">, </span><span class="ct-668f90">'address-2'</span><span class="ct-647ed6">], </span><span class="ct-95eeb3">//Only get events from specific addresses</span></span><span class="line"><span class="ct-647ed6"> topics: [] </span><span class="ct-95eeb3">//What topics to subscribe to</span></span><span class="line"><span class="ct-647ed6"> };</span></span><span class="line"></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-1e0e69">let</span><span class="ct-647ed6"> </span><span class="ct-52bc93">subscription</span><span class="ct-647ed6"> </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> (</span><span class="ct-668f90">'logs'</span><span class="ct-647ed6">, </span><span class="ct-52bc93">options</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-a49a53">if</span><span class="ct-647ed6"> (</span><span class="ct-a49a53">!</span><span class="ct-52bc93">err</span><span class="ct-647ed6">)</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-52bc93">console</span><span class="ct-647ed6">.</span><span class="ct-28eb49">log</span><span class="ct-647ed6">(</span><span class="ct-52bc93">event</span><span class="ct-647ed6">)</span></span><span class="line"><span class="ct-647ed6"> });</span></span><span class="line"></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-52bc93">subscription</span><span class="ct-647ed6">.</span><span class="ct-28eb49">on</span><span class="ct-647ed6">(</span><span class="ct-668f90">'data'</span><span class="ct-1e0e69">=></span><span class="ct-647ed6"> </span><span class="ct-52bc93">console</span><span class="ct-647ed6">.</span><span class="ct-28eb49">log</span><span class="ct-647ed6">(</span><span class="ct-52bc93">event</span><span class="ct-647ed6">))</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-52bc93">subscription</span><span class="ct-647ed6">.</span><span class="ct-28eb49">on</span><span class="ct-647ed6">(</span><span class="ct-668f90">'changed'</span><span class="ct-1e0e69">=></span><span class="ct-647ed6"> </span><span class="ct-52bc93">console</span><span class="ct-647ed6">.</span><span class="ct-28eb49">log</span><span class="ct-647ed6">(</span><span class="ct-52bc93">changed</span><span class="ct-647ed6">))</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-52bc93">subscription</span><span class="ct-647ed6">.</span><span class="ct-28eb49">on</span><span class="ct-647ed6">(</span><span class="ct-668f90">'error'</span><span class="ct-1e0e69">=></span><span class="ct-647ed6"> { </span><span class="ct-a49a53">throw</span><span class="ct-647ed6"> </span><span class="ct-52bc93">err</span><span class="ct-647ed6"> })</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-52bc93">subscription</span><span class="ct-647ed6">.</span><span class="ct-28eb49">on</span><span class="ct-647ed6">(</span><span class="ct-668f90">'connected'</span><span class="ct-1e0e69">=></span><span class="ct-647ed6"> </span><span class="ct-52bc93">console</span><span class="ct-647ed6">.</span><span class="ct-28eb49">log</span><span class="ct-647ed6">(</span><span class="ct-52bc93">nr</span><span class="ct-647ed6">))</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-647ed6"> </span><span class="ct-95eeb3">//example options(optional)</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-1e0e69">let</span><span class="ct-647ed6"> </span><span class="ct-52bc93">options</span><span class="ct-647ed6"> </span><span class="ct-a49a53">=</span><span class="ct-647ed6"> {</span></span><span class="line"><span class="ct-647ed6"> filter: {</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-95eeb3">// only get events where transfer value was 1000 or 1337</span></span><span class="line"><span class="ct-647ed6"> value: [</span><span class="ct-668f90">'1000'</span><span class="ct-647ed6">, </span><span class="ct-668f90">'1337'</span><span class="ct-647ed6">] </span></span><span class="line"><span class="ct-647ed6"> },</span></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-95eeb3">// number | "earliest" | "pending" | "latest"</span></span><span class="line"><span class="ct-647ed6"> fromBlock: </span><span class="ct-de18c8">0</span><span class="ct-647ed6">, </span></span><span class="line"><span class="ct-647ed6"> toBlock: </span><span class="ct-668f90">'latest'</span></span><span class="line"><span class="ct-647ed6"> };</span></span><span class="line"></span><span class="line"><span class="ct-647ed6"> </span><span class="ct-52bc93">myContract</span><span class="ct-647ed6">.</span><span class="ct-28eb49">getPastEvents</span><span class="ct-647ed6">(</span><span class="ct-668f90">'Transfer'</span><span class="ct-647ed6">, </span><span class="ct-52bc93">options</span><span class="ct-647ed6">)</span></span><span class="line"><span class="ct-647ed6"> .</span><span class="ct-28eb49">then</span><span class="ct-647ed6"> </span><span class="ct-28eb49">log</span><span class="ct-647ed6">(</span><span class="ct-52bc93">results</span><span class="ct-647ed6">))</span></span><span class="line"><span class="ct-647ed6"> .</span><span class="ct-28eb49">catch</span><span class="ct-647ed6"> </span></span></code></pre><!--]--></div><style>.ct-69b377{color:#FFA657}.ct-301814{color:#A5D6FF}.ct-98c625{color:#79C0FF}.ct-dfe1b7{color:#79C0FF}.ct-de18c8{color:#79C0FF}.ct-becaca{color:#79C0FF}.ct-1e0e69{color:#FF7B72}.ct-95eeb3{color:#8B949E}.ct-64faeb{color:#FFA657}.ct-28eb49{color:#D2A8FF}.ct-c4aa7f{color:#79C0FF}.ct-790fa3{color:#79C0FF}.ct-176f77{color:#79C0FF}.ct-bd4d1d{color:#FFA657}.ct-5b11b7{color:#FF7B72}.ct-3d5a95{color:#D2A8FF}.ct-dbf423{color:#C9D1D9}.ct-161fb2{color:#FF7B72}.ct-668f90{color:#A5D6FF}.ct-52bc93{color:#C9D1D9}.ct-647ed6{color:#C9D1D9}.ct-a49a53{color:#FF7B72}.light .ct-a49a53{color:#859900}.light .ct-647ed6{color:#657B83}.light .ct-52bc93{color:#268BD2}.light .ct-668f90{color:#2AA198}.light .ct-161fb2{color:#073642}.light .ct-dbf423{color:#657B83}.light .ct-3d5a95{color:#268BD2}.light .ct-5b11b7{color:#859900}.light .ct-bd4d1d{color:#657B83}.light .ct-176f77{color:#859900}.light .ct-790fa3{color:#268BD2}.light .ct-c4aa7f{color:#657B83}.light .ct-28eb49{color:#268BD2}.light .ct-64faeb{color:#657B83}.light .ct-95eeb3{color:#93A1A1}.light .ct-1e0e69{color:#073642}.light .ct-becaca{color:#268BD2}.light .ct-de18c8{color:#D33682}.light .ct-dfe1b7{color:#859900}.light .ct-98c625{color:#B58900}.light .ct-301814{color:#2AA198}.light .ct-69b377{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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