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class="_row_192pu_24"><a href="/typescript/add-global-variable-to-window" class="_link_192pu_66">Add Global Variable To Window</a></div><div class="_row_192pu_24"><a href="/typescript/flatten-object-with-periods" class="_link_192pu_66">Flatten Object With Periods</a></div><div class="_row_192pu_24"><a href="/typescript/type-guards" class="_link_192pu_66">Type Guards</a></div><!--]--></div></div></div><!--]--></nav></div></div><div class="_main_bdvnl_17"><div class="_wrapper_1hfaq_1" hastransition="true"><div class="_content_1hfaq_7"><button class="_theme_toggle_1hfaq_28 _button_jz7in_1 _theme_toggle_1hfaq_28"><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-a00ecd">import</span><span class="ct-5f84b8"> { </span><span class="ct-389197">Contract</span><span class="ct-5f84b8"> } </span><span class="ct-a00ecd">from</span><span class="ct-5f84b8"> </span><span class="ct-69a21a">'web3-eth-contract'</span><span class="ct-5f84b8">;</span></span><span class="line"><span class="ct-a00ecd">import</span><span class="ct-5f84b8"> { </span><span class="ct-389197">web3</span><span class="ct-5f84b8"> } </span><span class="ct-a00ecd">from</span><span class="ct-5f84b8"> </span><span class="ct-69a21a">'.'</span><span class="ct-5f84b8">;</span></span><span class="line"></span><span class="line"><span class="ct-7475e8">const</span><span class="ct-16c265"> </span><span class="ct-d6daf9">getContract</span><span class="ct-16c265"> </span><span class="ct-148471">=</span><span class="ct-16c265"> (</span><span class="ct-60e515">abi</span><span class="ct-148471">:</span><span class="ct-16c265"> </span><span class="ct-427bbc">object</span><span class="ct-16c265">, </span><span class="ct-60e515">address</span><span class="ct-148471">?:</span><span class="ct-16c265"> </span><span class="ct-427bbc">string</span><span class="ct-16c265">)</span><span class="ct-148471">:</span><span class="ct-16c265"> </span><span class="ct-7475e8">=></span><span class="ct-16c265"> {</span></span><span class="line"><span class="ct-16c265"> </span><span class="ct-7475e8">const</span><span class="ct-16c265"> </span><span class="ct-0c16cc">abiFromJson</span><span class="ct-16c265"> </span><span class="ct-148471">=</span><span class="ct-16c265"> </span><span class="ct-d924d9">JSON</span><span class="ct-16c265">.</span><span class="ct-0c16cc">parse</span><span class="ct-16c265">(</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-a00ecd">return</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">new</span><span class="ct-5f84b8"> </span><span class="ct-389197">web3</span><span class="ct-5f84b8">.</span><span class="ct-389197">eth</span><span class="ct-5f84b8">.</span><span class="ct-37c069">Contract</span><span class="ct-5f84b8">(</span><span class="ct-389197">abiFromJson</span><span class="ct-5f84b8">, </span><span class="ct-389197">address</span><span class="ct-5f84b8">);</span></span><span class="line"><span class="ct-5f84b8">};</span></span><span class="line"></span><span class="line"><span class="ct-a00ecd">export</span><span class="ct-3dd077"> </span><span class="ct-a00ecd">default</span><span class="ct-3dd077"> </span><span class="ct-389197">getContract</span><span class="ct-5f84b8">;</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-495eea">// see example below</span></span><span class="line"><span class="ct-a00ecd">import</span><span class="ct-5f84b8"> { </span><span class="ct-389197">getContract</span><span class="ct-5f84b8"> } </span><span class="ct-a00ecd">from</span><span class="ct-5f84b8"> </span><span class="ct-69a21a">'.'</span><span class="ct-5f84b8">;</span></span><span class="line"></span><span class="line"><span class="ct-495eea">// ABI of contract</span></span><span class="line"><span class="ct-307d26">const</span><span class="ct-5f84b8"> </span><span class="ct-047000">CONTRACT_ABI</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> { </span><span class="ct-495eea">/* ... */</span><span class="ct-5f84b8"> };</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-495eea">// address for contract</span></span><span class="line"><span class="ct-307d26">const</span><span class="ct-5f84b8"> </span><span class="ct-047000">CONTRACT_ADDRESS</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> </span><span class="ct-69a21a">'0xdea164f67df4dbfe675d5271c9d404e0260f33bb'</span><span class="ct-5f84b8">;</span></span><span class="line"></span><span class="line"><span class="ct-a00ecd">export</span><span class="ct-5f84b8"> </span><span class="ct-307d26">const</span><span class="ct-5f84b8"> </span><span class="ct-37c069">executeContractMethod</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> </span><span class="ct-307d26">async</span><span class="ct-5f84b8"> ({}) </span><span class="ct-307d26">=></span><span class="ct-5f84b8"> {</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-495eea">// getting contract</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-307d26">const</span><span class="ct-5f84b8"> </span><span class="ct-047000">contract</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> </span><span class="ct-37c069">getContract</span><span class="ct-5f84b8">(</span><span class="ct-047000">CONTRACT_ABI</span><span class="ct-5f84b8">, </span><span class="ct-047000">CONTRACT_ADDRESS</span><span class="ct-5f84b8">);</span></span><span class="line"><span class="ct-5f84b8"> </span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-495eea">// Calling write method</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-a00ecd">try</span><span class="ct-5f84b8"> {</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-495eea">// authorizing with Metamask</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-a00ecd">await</span><span class="ct-5f84b8"> </span><span class="ct-389197">web3</span><span class="ct-5f84b8">.</span><span class="ct-389197">currentProvider</span><span class="ct-5f84b8">.</span><span class="ct-37c069">request</span><span class="ct-5f84b8">({ method: </span><span class="ct-69a21a">'eth_requestAccounts'</span><span class="ct-5f84b8"> });</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-495eea">// getting wallet address</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-307d26">const</span><span class="ct-5f84b8"> </span><span class="ct-047000">addressUser</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> </span><span class="ct-389197">web3</span><span class="ct-5f84b8">.</span><span class="ct-389197">currentProvider</span><span class="ct-5f84b8">.</span><span class="ct-389197">selectedAddress</span><span class="ct-5f84b8">;</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-495eea">// calling "store" store method for contract</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-495eea">// payload should include `from` address, that matches</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-495eea">// current user's wallet</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-a00ecd">await</span><span class="ct-5f84b8"> </span><span class="ct-389197">contract</span><span class="ct-5f84b8">.</span><span class="ct-389197">methods</span><span class="ct-5f84b8">.</span><span class="ct-37c069">store</span><span class="ct-5f84b8">(</span><span class="ct-538bd0">0</span><span class="ct-5f84b8">, </span><span class="ct-69a21a">'Parameter'</span><span class="ct-5f84b8">).</span><span class="ct-37c069">send</span><span class="ct-5f84b8">({</span></span><span class="line"><span class="ct-5f84b8"> from: </span><span class="ct-389197">addressUser</span><span class="ct-5f84b8">,</span></span><span class="line"><span class="ct-5f84b8"> });</span></span><span class="line"><span class="ct-5f84b8"> } </span><span class="ct-a00ecd">catch</span><span class="ct-5f84b8"> (</span><span class="ct-389197">e</span><span class="ct-5f84b8">) {</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-a00ecd">throw</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">new</span><span class="ct-5f84b8"> </span><span class="ct-4a0f6a">Error</span><span class="ct-5f84b8">(</span><span class="ct-389197">e</span><span class="ct-5f84b8">);</span></span><span class="line"><span class="ct-5f84b8"> }</span></span><span class="line"><span class="ct-5f84b8"> </span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-495eea">// calling read method</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-a00ecd">try</span><span class="ct-5f84b8"> {</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-495eea">// this method can return data</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-307d26">const</span><span class="ct-5f84b8"> </span><span class="ct-047000">result</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">await</span><span class="ct-5f84b8"> </span><span class="ct-389197">contract</span><span class="ct-5f84b8">.</span><span class="ct-389197">methods</span><span class="ct-5f84b8">.</span><span class="ct-37c069">retrieve</span><span class="ct-5f84b8">().</span><span class="ct-37c069">call</span><span class="ct-5f84b8">();</span></span><span class="line"><span class="ct-5f84b8"> } </span><span class="ct-a00ecd">catch</span><span class="ct-5f84b8"> (</span><span class="ct-389197">e</span><span class="ct-5f84b8">) {</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-a00ecd">throw</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">new</span><span class="ct-5f84b8"> </span><span class="ct-4a0f6a">Error</span><span class="ct-5f84b8">(</span><span class="ct-389197">e</span><span class="ct-5f84b8">);</span></span><span class="line"><span class="ct-5f84b8"> }</span></span><span class="line"><span class="ct-5f84b8">}</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-495eea">// see example below</span></span><span class="line"><span class="ct-a00ecd">import</span><span class="ct-5f84b8"> { </span><span class="ct-389197">getContract</span><span class="ct-5f84b8"> } </span><span class="ct-a00ecd">from</span><span class="ct-5f84b8"> </span><span class="ct-69a21a">'.'</span><span class="ct-5f84b8">;</span></span><span class="line"></span><span class="line"><span class="ct-495eea">// ABI контракта</span></span><span class="line"><span class="ct-307d26">const</span><span class="ct-5f84b8"> </span><span class="ct-047000">CONTRACT_ABI</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> { </span><span class="ct-495eea">/* ... */</span><span class="ct-5f84b8"> };</span></span><span class="line"><span class="ct-495eea">// contract address</span></span><span class="line"><span class="ct-307d26">const</span><span class="ct-5f84b8"> </span><span class="ct-047000">CONTRACT_ADDRESS</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> </span><span class="ct-69a21a">'0xdea164f67df4dbfe675d5271c9d404e0260f33bb'</span><span class="ct-5f84b8">;</span></span><span class="line"><span class="ct-495eea">// getting contract</span></span><span class="line"><span class="ct-307d26">const</span><span class="ct-5f84b8"> </span><span class="ct-047000">contract</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> </span><span class="ct-37c069">getContract</span><span class="ct-5f84b8">(</span><span class="ct-047000">CONTRACT_ABI</span><span class="ct-5f84b8">, </span><span class="ct-047000">CONTRACT_ADDRESS</span><span class="ct-5f84b8">);</span></span><span class="line"><span class="ct-495eea">// account's private key</span></span><span class="line"><span class="ct-307d26">const</span><span class="ct-5f84b8"> </span><span class="ct-047000">privateKey</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> </span><span class="ct-69a21a">'...'</span><span class="ct-5f84b8">;</span></span><span class="line"></span><span class="line"><span class="ct-495eea">// write-methods requires private key</span></span><span class="line"><span class="ct-7475e8">const</span><span class="ct-16c265"> </span><span class="ct-d6daf9">executeContractMethod</span><span class="ct-16c265"> </span><span class="ct-148471">=</span><span class="ct-16c265"> </span><span class="ct-7475e8">async</span><span class="ct-16c265"> (</span><span class="ct-60e515">val</span><span class="ct-148471">:</span><span class="ct-16c265"> </span><span class="ct-427bbc">number</span><span class="ct-16c265">) </span><span class="ct-7475e8">=></span><span class="ct-16c265"> {</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-307d26">const</span><span class="ct-5f84b8"> </span><span class="ct-047000">transaction</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> </span><span class="ct-389197">contract</span><span class="ct-5f84b8">.</span><span class="ct-389197">methods</span><span class="ct-5f84b8">.</span><span class="ct-37c069">store</span><span class="ct-5f84b8">(</span><span class="ct-389197">val</span><span class="ct-5f84b8">);</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-307d26">const</span><span class="ct-5f84b8"> </span><span class="ct-047000">account</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> </span><span class="ct-389197">web3</span><span class="ct-5f84b8">.</span><span class="ct-389197">eth</span><span class="ct-5f84b8">.</span><span class="ct-389197">accounts</span><span class="ct-5f84b8">.</span><span class="ct-37c069">privateKeyToAccount</span><span class="ct-5f84b8">(</span><span class="ct-389197">privateKey</span><span class="ct-5f84b8">);</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-307d26">const</span><span class="ct-5f84b8"> </span><span class="ct-047000">options</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> {</span></span><span class="line"><span class="ct-5f84b8"> to: </span><span class="ct-047000">CONTRACT_ADDRESS</span><span class="ct-5f84b8">,</span></span><span class="line"><span class="ct-5f84b8"> data: </span><span class="ct-389197">transaction</span><span class="ct-5f84b8">.</span><span class="ct-37c069">encodeABI</span><span class="ct-5f84b8">(),</span></span><span class="line"><span class="ct-5f84b8"> gas: </span><span class="ct-a00ecd">await</span><span class="ct-5f84b8"> </span><span class="ct-389197">transaction</span><span class="ct-5f84b8">.</span><span class="ct-37c069">estimateGas</span><span class="ct-5f84b8">({ from: </span><span class="ct-389197">account</span><span class="ct-5f84b8">.</span><span class="ct-389197">address</span><span class="ct-5f84b8"> }),</span></span><span class="line"><span class="ct-5f84b8"> gasPrice: </span><span class="ct-a00ecd">await</span><span class="ct-5f84b8"> </span><span class="ct-389197">web3</span><span class="ct-5f84b8">.</span><span class="ct-389197">eth</span><span class="ct-5f84b8">.</span><span class="ct-37c069">getGasPrice</span><span class="ct-5f84b8">(),</span></span><span class="line"><span class="ct-5f84b8"> };</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-307d26">const</span><span class="ct-5f84b8"> </span><span class="ct-047000">signed</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">await</span><span class="ct-5f84b8"> </span><span class="ct-389197">web3</span><span class="ct-5f84b8">.</span><span class="ct-389197">eth</span><span class="ct-5f84b8">.</span><span class="ct-389197">accounts</span><span class="ct-5f84b8">.</span><span class="ct-37c069">signTransaction</span><span class="ct-5f84b8">(</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-389197">options</span><span class="ct-5f84b8">,</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-389197">privateKey</span><span class="ct-5f84b8">,</span></span><span class="line"><span class="ct-5f84b8"> );</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-a00ecd">await</span><span class="ct-5f84b8"> </span><span class="ct-389197">web3</span><span class="ct-5f84b8">.</span><span class="ct-389197">eth</span><span class="ct-5f84b8">.</span><span class="ct-37c069">sendSignedTransaction</span><span class="ct-5f84b8">(</span><span class="ct-389197">signed</span><span class="ct-5f84b8">.</span><span class="ct-389197">rawTransaction</span><span class="ct-a00ecd">!</span><span class="ct-5f84b8">);</span></span><span class="line"><span class="ct-5f84b8">};</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-5f84b8"> </span><span class="ct-307d26">const</span><span class="ct-5f84b8"> </span><span class="ct-047000">requests</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> [</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-389197">contract</span><span class="ct-5f84b8">.</span><span class="ct-389197">method</span><span class="ct-5f84b8">.</span><span class="ct-37c069">balanceOf</span><span class="ct-5f84b8">().</span><span class="ct-389197">call</span><span class="ct-5f84b8">,</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-389197">contract</span><span class="ct-5f84b8">.</span><span class="ct-389197">method</span><span class="ct-5f84b8">.</span><span class="ct-37c069">getStaked</span><span class="ct-5f84b8">().</span><span class="ct-389197">call</span></span><span class="line"><span class="ct-5f84b8"> ]</span></span><span class="line"></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-307d26">const</span><span class="ct-5f84b8"> </span><span class="ct-047000">result</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">await</span><span class="ct-5f84b8"> </span><span class="ct-37c069">makeBatchRequest</span><span class="ct-5f84b8">(</span><span class="ct-389197">request</span><span class="ct-5f84b8">);</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-307d26">const</span><span class="ct-5f84b8"> </span><span class="ct-047000">web3</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">new</span><span class="ct-5f84b8"> </span><span class="ct-37c069">Web3</span><span class="ct-5f84b8">(</span><span class="ct-389197">Web3</span><span class="ct-5f84b8">.</span><span class="ct-389197">givenProvider</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">||</span><span class="ct-5f84b8"> </span><span class="ct-047000">PROVIDER_URL</span><span class="ct-5f84b8">);</span></span><span class="line"></span><span class="line"><span class="ct-7475e8">const</span><span class="ct-16c265"> </span><span class="ct-d6daf9">makeBatchRequest</span><span class="ct-16c265"> </span><span class="ct-148471">=</span><span class="ct-16c265"> (</span><span class="ct-60e515">calls</span><span class="ct-148471">:</span><span class="ct-16c265"> </span><span class="ct-427bbc">any</span><span class="ct-16c265">[]) </span><span class="ct-7475e8">=></span><span class="ct-16c265"> {</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-a00ecd">try</span><span class="ct-5f84b8"> {</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-307d26">const</span><span class="ct-5f84b8"> </span><span class="ct-047000">web3</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> </span><span class="ct-37c069">getWeb3NoAccount</span><span class="ct-5f84b8">();</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-307d26">const</span><span class="ct-5f84b8"> </span><span class="ct-047000">batch</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">new</span><span class="ct-5f84b8"> </span><span class="ct-389197">web3</span><span class="ct-5f84b8">.</span><span class="ct-37c069">BatchRequest</span><span class="ct-5f84b8">();</span></span><span class="line"></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-307d26">const</span><span class="ct-5f84b8"> </span><span class="ct-047000">promises</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> </span><span class="ct-389197">calls</span><span class="ct-5f84b8">.</span><span class="ct-37c069">map</span><span class="ct-307d26">=></span><span class="ct-5f84b8"> {</span></span><span class="line"><span class="ct-16c265"> </span><span class="ct-148471">return</span><span class="ct-16c265"> </span><span class="ct-148471">new</span><span class="ct-16c265"> </span><span class="ct-427bbc">Promise</span><span class="ct-16c265">((</span><span class="ct-60e515">resolve</span><span class="ct-16c265">, </span><span class="ct-60e515">reject</span><span class="ct-16c265">) </span><span class="ct-7475e8">=></span><span class="ct-16c265"> {</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-389197">batch</span><span class="ct-5f84b8">.</span><span class="ct-37c069">add</span><span class="ct-5f84b8">(</span></span><span class="line"></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-a00ecd">if</span><span class="ct-5f84b8"> (</span><span class="ct-389197">err</span><span class="ct-5f84b8">) {</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-37c069">reject</span><span class="ct-5f84b8">(</span><span class="ct-389197">err</span><span class="ct-5f84b8">);</span></span><span class="line"><span class="ct-5f84b8"> } </span><span class="ct-a00ecd">else</span><span class="ct-5f84b8"> {</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-37c069">resolve</span><span class="ct-5f84b8">(</span><span class="ct-389197">result</span><span class="ct-5f84b8">);</span></span><span class="line"><span class="ct-5f84b8"> }</span></span><span class="line"><span class="ct-5f84b8"> })</span></span><span class="line"><span class="ct-5f84b8"> );</span></span><span class="line"><span class="ct-5f84b8"> });</span></span><span class="line"><span class="ct-5f84b8"> });</span></span><span class="line"></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-389197">batch</span><span class="ct-5f84b8">.</span><span class="ct-37c069">execute</span><span class="ct-5f84b8">();</span></span><span class="line"></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-a00ecd">return</span><span class="ct-5f84b8"> </span><span class="ct-4a0f6a">Promise</span><span class="ct-5f84b8">.</span><span class="ct-37c069">all</span><span class="ct-5f84b8">(</span><span class="ct-389197">promises</span><span class="ct-5f84b8">);</span></span><span class="line"><span class="ct-5f84b8"> } </span><span class="ct-a00ecd">catch</span><span class="ct-5f84b8"> {</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-a00ecd">return</span><span class="ct-5f84b8"> </span><span class="ct-81ebef">null</span><span class="ct-5f84b8">;</span></span><span class="line"><span class="ct-5f84b8"> }</span></span><span class="line"><span class="ct-5f84b8">};</span></span><span class="line"></span><span class="line"><span class="ct-a00ecd">export</span><span class="ct-3dd077"> </span><span class="ct-a00ecd">default</span><span class="ct-3dd077"> </span><span class="ct-389197">makeBatchRequest</span><span class="ct-5f84b8">;</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-5f84b8"> </span><span class="ct-a00ecd">import</span><span class="ct-5f84b8"> </span><span class="ct-389197">Web3</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">from</span><span class="ct-5f84b8"> </span><span class="ct-69a21a">'web3'</span><span class="ct-5f84b8">;</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-307d26">const</span><span class="ct-5f84b8"> </span><span class="ct-047000">web3</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">new</span><span class="ct-5f84b8"> </span><span class="ct-37c069">Web3</span><span class="ct-5f84b8">(</span><span class="ct-69a21a">'YOUR_RPC_ENDPOINT_HERE'</span><span class="ct-5f84b8">);</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-307d26">const</span><span class="ct-5f84b8"> </span><span class="ct-047000">ABI</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> </span><span class="ct-69a21a">'YOUR ABI HERE'</span><span class="ct-5f84b8">;</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-307d26">const</span><span class="ct-5f84b8"> </span><span class="ct-047000">CONTRACT_ADDRESS</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> </span><span class="ct-69a21a">'YOUR CONTRACT ADDRESS HERE'</span><span class="ct-5f84b8">;</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-307d26">const</span><span class="ct-5f84b8"> </span><span class="ct-047000">myContract</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">new</span><span class="ct-5f84b8"> </span><span class="ct-389197">Web3</span><span class="ct-5f84b8">.</span><span class="ct-37c069">Contract</span><span class="ct-5f84b8">(</span><span class="ct-047000">ABI</span><span class="ct-5f84b8">, </span><span class="ct-047000">CONTRACT_ADDRESS</span><span class="ct-5f84b8">);</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-389197">referralProgramContract</span><span class="ct-5f84b8">.</span><span class="ct-389197">events</span></span><span class="line"><span class="ct-5f84b8"> .</span><span class="ct-37c069">RegisterUser</span><span class="ct-5f84b8">()</span></span><span class="line"><span class="ct-16c265"> .</span><span class="ct-d6daf9">on</span><span class="ct-16c265">(</span><span class="ct-0a0823">'connected'</span><span class="ct-16c265">, (</span><span class="ct-60e515">subscriptionId</span><span class="ct-148471">:</span><span class="ct-16c265"> </span><span class="ct-427bbc">string</span><span class="ct-16c265">) </span><span class="ct-7475e8">=></span><span class="ct-16c265"> {</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-389197">console</span><span class="ct-5f84b8">.</span><span class="ct-37c069">log</span><span class="ct-5f84b8">(</span><span class="ct-69a21a">`| UserRegistered | events | ${</span><span class="ct-389197">subscriptionId</span><span class="ct-69a21a">}`</span><span class="ct-5f84b8">);</span></span><span class="line"><span class="ct-5f84b8"> })</span></span><span class="line"><span class="ct-5f84b8"> .</span><span class="ct-37c069">on</span><span class="ct-5f84b8">(</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-69a21a">'data'</span><span class="ct-5f84b8">,</span></span><span class="line"><span class="ct-16c265"> </span><span class="ct-7475e8">async</span><span class="ct-16c265"> (</span><span class="ct-60e515">event</span><span class="ct-148471">:</span><span class="ct-16c265"> {</span></span><span class="line"><span class="ct-16c265"> </span><span class="ct-60e515">removed</span><span class="ct-148471">:</span><span class="ct-16c265"> </span><span class="ct-427bbc">boolean</span><span class="ct-16c265">;</span></span><span class="line"><span class="ct-16c265"> </span><span class="ct-60e515">returnValues</span><span class="ct-148471">:</span><span class="ct-16c265"> </span><span class="ct-3cce47">RegisterUserResponseInterface</span><span class="ct-16c265">;</span></span><span class="line"><span class="ct-5f84b8"> }) </span><span class="ct-307d26">=></span><span class="ct-5f84b8"> {</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-a00ecd">try</span><span class="ct-5f84b8"> {</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-a00ecd">if</span><span class="ct-5f84b8"> (</span><span class="ct-389197">event</span><span class="ct-5f84b8">.</span><span class="ct-389197">removed</span><span class="ct-5f84b8">) {</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-a00ecd">return</span><span class="ct-5f84b8">;</span></span><span class="line"><span class="ct-5f84b8"> }</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-307d26">const</span><span class="ct-5f84b8"> { </span><span class="ct-047000">user</span><span class="ct-5f84b8">, </span><span class="ct-047000">referrer</span><span class="ct-5f84b8"> } </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> </span><span class="ct-389197">event</span><span class="ct-5f84b8">.</span><span class="ct-389197">returnValues</span><span class="ct-5f84b8">;</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-389197">console</span><span class="ct-5f84b8">.</span><span class="ct-37c069">log</span><span class="ct-5f84b8">(</span><span class="ct-389197">user</span><span class="ct-5f84b8">, </span><span class="ct-389197">referrer</span><span class="ct-5f84b8">);</span></span><span class="line"><span class="ct-5f84b8"> } </span><span class="ct-a00ecd">catch</span><span class="ct-5f84b8"> (</span><span class="ct-389197">e</span><span class="ct-5f84b8">) {</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-389197">console</span><span class="ct-5f84b8">.</span><span class="ct-37c069">log</span><span class="ct-5f84b8">(</span><span class="ct-69a21a">`| ONCE | ${</span><span class="ct-389197">e</span><span class="ct-69a21a">}`</span><span class="ct-5f84b8">);</span></span><span class="line"><span class="ct-5f84b8"> }</span></span><span class="line"><span class="ct-5f84b8"> },</span></span><span class="line"><span class="ct-5f84b8"> )</span></span><span class="line"><span class="ct-16c265"> .</span><span class="ct-d6daf9">on</span><span class="ct-16c265">(</span><span class="ct-0a0823">'error'</span><span class="ct-16c265">, (</span><span class="ct-60e515">error</span><span class="ct-148471">:</span><span class="ct-16c265"> </span><span class="ct-3cce47">ErrnoException</span><span class="ct-16c265">) </span><span class="ct-7475e8">=></span><span class="ct-16c265"> {</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-389197">console</span><span class="ct-5f84b8">.</span><span class="ct-37c069">log</span><span class="ct-5f84b8">(</span><span class="ct-389197">error</span><span class="ct-5f84b8">);</span></span><span class="line"><span class="ct-5f84b8"> });</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-5f84b8"> </span><span class="ct-307d26">let</span><span class="ct-5f84b8"> </span><span class="ct-389197">options</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> {</span></span><span class="line"><span class="ct-5f84b8"> filter: {</span></span><span class="line"><span class="ct-5f84b8"> value: [],</span></span><span class="line"><span class="ct-5f84b8"> },</span></span><span class="line"><span class="ct-5f84b8"> fromBlock: </span><span class="ct-538bd0">0</span></span><span class="line"><span class="ct-5f84b8"> };</span></span><span class="line"></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-389197">myContract</span><span class="ct-5f84b8">.</span><span class="ct-389197">events</span><span class="ct-5f84b8">.</span><span class="ct-37c069">Transfer</span><span class="ct-5f84b8">(</span><span class="ct-389197">options</span><span class="ct-5f84b8">)</span></span><span class="line"><span class="ct-5f84b8"> .</span><span class="ct-37c069">on</span><span class="ct-5f84b8">(</span><span class="ct-69a21a">'data'</span><span class="ct-5f84b8"> </span><span class="ct-37c069">log</span><span class="ct-5f84b8">(</span><span class="ct-389197">event</span><span class="ct-5f84b8">))</span></span><span class="line"><span class="ct-5f84b8"> .</span><span class="ct-37c069">on</span><span class="ct-5f84b8">(</span><span class="ct-69a21a">'changed'</span><span class="ct-5f84b8"> </span><span class="ct-37c069">log</span><span class="ct-5f84b8">(</span><span class="ct-389197">changed</span><span class="ct-5f84b8">))</span></span><span class="line"><span class="ct-5f84b8"> .</span><span class="ct-37c069">on</span><span class="ct-5f84b8">(</span><span class="ct-69a21a">'error'</span><span class="ct-5f84b8"> </span></span><span class="line"><span class="ct-5f84b8"> .</span><span class="ct-37c069">on</span><span class="ct-5f84b8">(</span><span class="ct-69a21a">'connected'</span><span class="ct-5f84b8"> </span><span class="ct-37c069">log</span><span class="ct-5f84b8">(</span><span class="ct-389197">str</span><span class="ct-5f84b8">))</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-5f84b8"> </span><span class="ct-307d26">let</span><span class="ct-5f84b8"> </span><span class="ct-389197">options</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> {</span></span><span class="line"><span class="ct-5f84b8"> fromBlock: </span><span class="ct-538bd0">0</span><span class="ct-5f84b8">,</span></span><span class="line"><span class="ct-5f84b8"> address: [</span><span class="ct-69a21a">'address-1'</span><span class="ct-5f84b8">, </span><span class="ct-69a21a">'address-2'</span><span class="ct-5f84b8">], </span><span class="ct-495eea">//Only get events from specific addresses</span></span><span class="line"><span class="ct-5f84b8"> topics: [] </span><span class="ct-495eea">//What topics to subscribe to</span></span><span class="line"><span class="ct-5f84b8"> };</span></span><span class="line"></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-307d26">let</span><span class="ct-5f84b8"> </span><span class="ct-389197">subscription</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> (</span><span class="ct-69a21a">'logs'</span><span class="ct-5f84b8">, </span><span class="ct-389197">options</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-a00ecd">if</span><span class="ct-5f84b8"> (</span><span class="ct-a00ecd">!</span><span class="ct-389197">err</span><span class="ct-5f84b8">)</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-389197">console</span><span class="ct-5f84b8">.</span><span class="ct-37c069">log</span><span class="ct-5f84b8">(</span><span class="ct-389197">event</span><span class="ct-5f84b8">)</span></span><span class="line"><span class="ct-5f84b8"> });</span></span><span class="line"></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-389197">subscription</span><span class="ct-5f84b8">.</span><span class="ct-37c069">on</span><span class="ct-5f84b8">(</span><span class="ct-69a21a">'data'</span><span class="ct-307d26">=></span><span class="ct-5f84b8"> </span><span class="ct-389197">console</span><span class="ct-5f84b8">.</span><span class="ct-37c069">log</span><span class="ct-5f84b8">(</span><span class="ct-389197">event</span><span class="ct-5f84b8">))</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-389197">subscription</span><span class="ct-5f84b8">.</span><span class="ct-37c069">on</span><span class="ct-5f84b8">(</span><span class="ct-69a21a">'changed'</span><span class="ct-307d26">=></span><span class="ct-5f84b8"> </span><span class="ct-389197">console</span><span class="ct-5f84b8">.</span><span class="ct-37c069">log</span><span class="ct-5f84b8">(</span><span class="ct-389197">changed</span><span class="ct-5f84b8">))</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-389197">subscription</span><span class="ct-5f84b8">.</span><span class="ct-37c069">on</span><span class="ct-5f84b8">(</span><span class="ct-69a21a">'error'</span><span class="ct-307d26">=></span><span class="ct-5f84b8"> { </span><span class="ct-a00ecd">throw</span><span class="ct-5f84b8"> </span><span class="ct-389197">err</span><span class="ct-5f84b8"> })</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-389197">subscription</span><span class="ct-5f84b8">.</span><span class="ct-37c069">on</span><span class="ct-5f84b8">(</span><span class="ct-69a21a">'connected'</span><span class="ct-307d26">=></span><span class="ct-5f84b8"> </span><span class="ct-389197">console</span><span class="ct-5f84b8">.</span><span class="ct-37c069">log</span><span class="ct-5f84b8">(</span><span class="ct-389197">nr</span><span class="ct-5f84b8">))</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-5f84b8"> </span><span class="ct-495eea">//example options(optional)</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-307d26">let</span><span class="ct-5f84b8"> </span><span class="ct-389197">options</span><span class="ct-5f84b8"> </span><span class="ct-a00ecd">=</span><span class="ct-5f84b8"> {</span></span><span class="line"><span class="ct-5f84b8"> filter: {</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-495eea">// only get events where transfer value was 1000 or 1337</span></span><span class="line"><span class="ct-5f84b8"> value: [</span><span class="ct-69a21a">'1000'</span><span class="ct-5f84b8">, </span><span class="ct-69a21a">'1337'</span><span class="ct-5f84b8">] </span></span><span class="line"><span class="ct-5f84b8"> },</span></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-495eea">// number | "earliest" | "pending" | "latest"</span></span><span class="line"><span class="ct-5f84b8"> fromBlock: </span><span class="ct-538bd0">0</span><span class="ct-5f84b8">, </span></span><span class="line"><span class="ct-5f84b8"> toBlock: </span><span class="ct-69a21a">'latest'</span></span><span class="line"><span class="ct-5f84b8"> };</span></span><span class="line"></span><span class="line"><span class="ct-5f84b8"> </span><span class="ct-389197">myContract</span><span class="ct-5f84b8">.</span><span class="ct-37c069">getPastEvents</span><span class="ct-5f84b8">(</span><span class="ct-69a21a">'Transfer'</span><span class="ct-5f84b8">, </span><span class="ct-389197">options</span><span class="ct-5f84b8">)</span></span><span class="line"><span class="ct-5f84b8"> .</span><span class="ct-37c069">then</span><span class="ct-5f84b8"> </span><span class="ct-37c069">log</span><span class="ct-5f84b8">(</span><span class="ct-389197">results</span><span class="ct-5f84b8">))</span></span><span class="line"><span class="ct-5f84b8"> .</span><span class="ct-37c069">catch</span><span class="ct-5f84b8"> </span></span></code></pre><!--]--></div><style>.ct-3cce47{color:#FFA657}.ct-0a0823{color:#A5D6FF}.ct-81ebef{color:#79C0FF}.ct-4a0f6a{color:#79C0FF}.ct-538bd0{color:#79C0FF}.ct-047000{color:#79C0FF}.ct-307d26{color:#FF7B72}.ct-495eea{color:#8B949E}.ct-3dd077{color:#FFA657}.ct-37c069{color:#D2A8FF}.ct-d924d9{color:#79C0FF}.ct-0c16cc{color:#79C0FF}.ct-427bbc{color:#79C0FF}.ct-60e515{color:#FFA657}.ct-148471{color:#FF7B72}.ct-d6daf9{color:#D2A8FF}.ct-16c265{color:#C9D1D9}.ct-7475e8{color:#FF7B72}.ct-69a21a{color:#A5D6FF}.ct-389197{color:#C9D1D9}.ct-5f84b8{color:#C9D1D9}.ct-a00ecd{color:#FF7B72}.light .ct-a00ecd{color:#859900}.light .ct-5f84b8{color:#657B83}.light .ct-389197{color:#268BD2}.light .ct-69a21a{color:#2AA198}.light .ct-7475e8{color:#073642}.light .ct-16c265{color:#657B83}.light .ct-d6daf9{color:#268BD2}.light .ct-148471{color:#859900}.light .ct-60e515{color:#657B83}.light .ct-427bbc{color:#859900}.light .ct-0c16cc{color:#268BD2}.light .ct-d924d9{color:#657B83}.light .ct-37c069{color:#268BD2}.light .ct-3dd077{color:#657B83}.light .ct-495eea{color:#93A1A1}.light .ct-307d26{color:#073642}.light .ct-047000{color:#268BD2}.light .ct-538bd0{color:#D33682}.light .ct-4a0f6a{color:#859900}.light .ct-81ebef{color:#B58900}.light .ct-0a0823{color:#2AA198}.light .ct-3cce47{color:#268BD2}</style></div></article><!--]--></main><!--]--><!--]--></div><footer class="_footer_ogxvf_1 _footer_1hfaq_22 _footer_1hfaq_22"><div>btw, have a nice day</div><div class="_filler_ogxvf_9"></div><div> (2018 - 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