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class="_link_192pu_66">Postgress Setup</a></div><!--]--></div></div></div><div class="_row_kmqkz_25"><div class="_container_192pu_1"><div class="_heading_192pu_48">Typescript</div><div class="_children_192pu_86"><!--[--><div class="_row_192pu_24"><a href="/typescript/add-global-variable-to-window" class="_link_192pu_66">Add Global Variable To Window</a></div><div class="_row_192pu_24"><a href="/typescript/flatten-object-with-periods" class="_link_192pu_66">Flatten Object With Periods</a></div><div class="_row_192pu_24"><a href="/typescript/type-guards" class="_link_192pu_66">Type Guards</a></div><!--]--></div></div></div><!--]--></nav></div></div><div class="_main_1ipws_17"><div class="_content_1ipws_93"><div class="_wrapper_vom09_1" hastransition="true"><div class="_content_vom09_14"><button class="_theme_toggle_vom09_24 _button_jz7in_1 _theme_toggle_vom09_24"><span></span></button><!--[--><!--[--><main class="_content_1gz79_1"><!--[--><h1>Smart Contracts</h1><article><div><p><!--[-->For common functions see <a href="/blockchain/common-typescript-examples" class=""><!--[-->Common typescript examples<!--]--></a>.<!--]--></p><h2 id="getting-smart-contract-instance"><a href="#getting-smart-contract-instance"><!--[-->Getting smart contract instance<!--]--></a></h2><p><!--[-->Useful for calling smart contract methods:<!--]--></p><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>typescript</span></button><!--[--><pre><code><span class="line"><span class="ct-167112">import</span><span class="ct-f25d6a"> { </span><span class="ct-78b2a1">Contract</span><span class="ct-f25d6a"> } </span><span class="ct-167112">from</span><span class="ct-f25d6a"> </span><span class="ct-7ab707">'web3-eth-contract'</span><span class="ct-f25d6a">;</span></span><span class="line"><span class="ct-167112">import</span><span class="ct-f25d6a"> { </span><span class="ct-78b2a1">web3</span><span class="ct-f25d6a"> } </span><span class="ct-167112">from</span><span class="ct-f25d6a"> </span><span class="ct-7ab707">'.'</span><span class="ct-f25d6a">;</span></span><span class="line"></span><span class="line"><span class="ct-6a6b94">const</span><span class="ct-08c842"> </span><span class="ct-ce6629">getContract</span><span class="ct-08c842"> </span><span class="ct-3d4b19">=</span><span class="ct-08c842"> (</span><span class="ct-895378">abi</span><span class="ct-3d4b19">:</span><span class="ct-08c842"> </span><span class="ct-1ed67f">object</span><span class="ct-08c842">, </span><span class="ct-895378">address</span><span class="ct-3d4b19">?:</span><span class="ct-08c842"> </span><span class="ct-1ed67f">string</span><span class="ct-08c842">)</span><span class="ct-3d4b19">:</span><span class="ct-08c842"> </span><span class="ct-6a6b94">=></span><span class="ct-08c842"> {</span></span><span class="line"><span class="ct-08c842"> </span><span class="ct-6a6b94">const</span><span class="ct-08c842"> </span><span class="ct-0359ef">abiFromJson</span><span class="ct-08c842"> </span><span class="ct-3d4b19">=</span><span class="ct-08c842"> </span><span class="ct-4f83aa">JSON</span><span class="ct-08c842">.</span><span class="ct-0359ef">parse</span><span class="ct-08c842">(</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-167112">return</span><span class="ct-f25d6a"> </span><span class="ct-167112">new</span><span class="ct-f25d6a"> </span><span class="ct-78b2a1">web3</span><span class="ct-f25d6a">.</span><span class="ct-78b2a1">eth</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">Contract</span><span class="ct-f25d6a">(</span><span class="ct-78b2a1">abiFromJson</span><span class="ct-f25d6a">, </span><span class="ct-78b2a1">address</span><span class="ct-f25d6a">);</span></span><span class="line"><span class="ct-f25d6a">};</span></span><span class="line"></span><span class="line"><span class="ct-167112">export</span><span class="ct-605c85"> </span><span class="ct-167112">default</span><span class="ct-605c85"> </span><span class="ct-78b2a1">getContract</span><span class="ct-f25d6a">;</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-04e485">// see example below</span></span><span class="line"><span class="ct-167112">import</span><span class="ct-f25d6a"> { </span><span class="ct-78b2a1">getContract</span><span class="ct-f25d6a"> } </span><span class="ct-167112">from</span><span class="ct-f25d6a"> </span><span class="ct-7ab707">'.'</span><span class="ct-f25d6a">;</span></span><span class="line"></span><span class="line"><span class="ct-04e485">// ABI of contract</span></span><span class="line"><span class="ct-253c68">const</span><span class="ct-f25d6a"> </span><span class="ct-10950e">CONTRACT_ABI</span><span class="ct-f25d6a"> </span><span class="ct-167112">=</span><span class="ct-f25d6a"> { </span><span class="ct-04e485">/* ... */</span><span class="ct-f25d6a"> };</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-04e485">// address for contract</span></span><span class="line"><span class="ct-253c68">const</span><span class="ct-f25d6a"> </span><span class="ct-10950e">CONTRACT_ADDRESS</span><span class="ct-f25d6a"> </span><span class="ct-167112">=</span><span class="ct-f25d6a"> </span><span class="ct-7ab707">'0xdea164f67df4dbfe675d5271c9d404e0260f33bb'</span><span class="ct-f25d6a">;</span></span><span class="line"></span><span class="line"><span class="ct-167112">export</span><span class="ct-f25d6a"> </span><span class="ct-253c68">const</span><span class="ct-f25d6a"> </span><span class="ct-d8533d">executeContractMethod</span><span class="ct-f25d6a"> </span><span class="ct-167112">=</span><span class="ct-f25d6a"> </span><span class="ct-253c68">async</span><span class="ct-f25d6a"> ({}) </span><span class="ct-253c68">=></span><span class="ct-f25d6a"> {</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-04e485">// getting contract</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-253c68">const</span><span class="ct-f25d6a"> </span><span class="ct-10950e">contract</span><span class="ct-f25d6a"> </span><span class="ct-167112">=</span><span class="ct-f25d6a"> </span><span class="ct-d8533d">getContract</span><span class="ct-f25d6a">(</span><span class="ct-10950e">CONTRACT_ABI</span><span class="ct-f25d6a">, </span><span class="ct-10950e">CONTRACT_ADDRESS</span><span class="ct-f25d6a">);</span></span><span class="line"><span class="ct-f25d6a"> </span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-04e485">// Calling write method</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-167112">try</span><span class="ct-f25d6a"> {</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-04e485">// authorizing with Metamask</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-167112">await</span><span class="ct-f25d6a"> </span><span class="ct-78b2a1">web3</span><span class="ct-f25d6a">.</span><span class="ct-78b2a1">currentProvider</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">request</span><span class="ct-f25d6a">({ method: </span><span class="ct-7ab707">'eth_requestAccounts'</span><span class="ct-f25d6a"> });</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-04e485">// getting wallet address</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-253c68">const</span><span class="ct-f25d6a"> </span><span class="ct-10950e">addressUser</span><span class="ct-f25d6a"> </span><span class="ct-167112">=</span><span class="ct-f25d6a"> </span><span class="ct-78b2a1">web3</span><span class="ct-f25d6a">.</span><span class="ct-78b2a1">currentProvider</span><span class="ct-f25d6a">.</span><span class="ct-78b2a1">selectedAddress</span><span class="ct-f25d6a">;</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-04e485">// calling "store" store method for contract</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-04e485">// payload should include `from` address, that matches</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-04e485">// current user's wallet</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-167112">await</span><span class="ct-f25d6a"> </span><span class="ct-78b2a1">contract</span><span class="ct-f25d6a">.</span><span class="ct-78b2a1">methods</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">store</span><span class="ct-f25d6a">(</span><span class="ct-5788b0">0</span><span class="ct-f25d6a">, </span><span class="ct-7ab707">'Parameter'</span><span class="ct-f25d6a">).</span><span class="ct-d8533d">send</span><span class="ct-f25d6a">({</span></span><span class="line"><span class="ct-f25d6a"> from: </span><span class="ct-78b2a1">addressUser</span><span class="ct-f25d6a">,</span></span><span class="line"><span class="ct-f25d6a"> });</span></span><span class="line"><span class="ct-f25d6a"> } </span><span class="ct-167112">catch</span><span class="ct-f25d6a"> (</span><span class="ct-78b2a1">e</span><span class="ct-f25d6a">) {</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-167112">throw</span><span class="ct-f25d6a"> </span><span class="ct-167112">new</span><span class="ct-f25d6a"> </span><span class="ct-a3e375">Error</span><span class="ct-f25d6a">(</span><span class="ct-78b2a1">e</span><span class="ct-f25d6a">);</span></span><span class="line"><span class="ct-f25d6a"> }</span></span><span class="line"><span class="ct-f25d6a"> </span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-04e485">// calling read method</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-167112">try</span><span class="ct-f25d6a"> {</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-04e485">// this method can return data</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-253c68">const</span><span class="ct-f25d6a"> </span><span class="ct-10950e">result</span><span class="ct-f25d6a"> </span><span class="ct-167112">=</span><span class="ct-f25d6a"> </span><span class="ct-167112">await</span><span class="ct-f25d6a"> </span><span class="ct-78b2a1">contract</span><span class="ct-f25d6a">.</span><span class="ct-78b2a1">methods</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">retrieve</span><span class="ct-f25d6a">().</span><span class="ct-d8533d">call</span><span class="ct-f25d6a">();</span></span><span class="line"><span class="ct-f25d6a"> } </span><span class="ct-167112">catch</span><span class="ct-f25d6a"> (</span><span class="ct-78b2a1">e</span><span class="ct-f25d6a">) {</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-167112">throw</span><span class="ct-f25d6a"> </span><span class="ct-167112">new</span><span class="ct-f25d6a"> </span><span class="ct-a3e375">Error</span><span class="ct-f25d6a">(</span><span class="ct-78b2a1">e</span><span class="ct-f25d6a">);</span></span><span class="line"><span class="ct-f25d6a"> }</span></span><span class="line"><span class="ct-f25d6a">}</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-04e485">// see example below</span></span><span class="line"><span class="ct-167112">import</span><span class="ct-f25d6a"> { </span><span class="ct-78b2a1">getContract</span><span class="ct-f25d6a"> } </span><span class="ct-167112">from</span><span class="ct-f25d6a"> </span><span class="ct-7ab707">'.'</span><span class="ct-f25d6a">;</span></span><span class="line"></span><span class="line"><span class="ct-04e485">// ABI контракта</span></span><span class="line"><span class="ct-253c68">const</span><span class="ct-f25d6a"> </span><span class="ct-10950e">CONTRACT_ABI</span><span class="ct-f25d6a"> </span><span class="ct-167112">=</span><span class="ct-f25d6a"> { </span><span class="ct-04e485">/* ... */</span><span class="ct-f25d6a"> };</span></span><span class="line"><span class="ct-04e485">// contract address</span></span><span class="line"><span class="ct-253c68">const</span><span class="ct-f25d6a"> </span><span class="ct-10950e">CONTRACT_ADDRESS</span><span class="ct-f25d6a"> </span><span class="ct-167112">=</span><span class="ct-f25d6a"> </span><span class="ct-7ab707">'0xdea164f67df4dbfe675d5271c9d404e0260f33bb'</span><span class="ct-f25d6a">;</span></span><span class="line"><span class="ct-04e485">// getting contract</span></span><span class="line"><span class="ct-253c68">const</span><span class="ct-f25d6a"> </span><span class="ct-10950e">contract</span><span class="ct-f25d6a"> </span><span class="ct-167112">=</span><span class="ct-f25d6a"> </span><span class="ct-d8533d">getContract</span><span class="ct-f25d6a">(</span><span class="ct-10950e">CONTRACT_ABI</span><span class="ct-f25d6a">, </span><span class="ct-10950e">CONTRACT_ADDRESS</span><span class="ct-f25d6a">);</span></span><span class="line"><span class="ct-04e485">// account's private key</span></span><span class="line"><span class="ct-253c68">const</span><span class="ct-f25d6a"> </span><span class="ct-10950e">privateKey</span><span class="ct-f25d6a"> </span><span class="ct-167112">=</span><span class="ct-f25d6a"> </span><span class="ct-7ab707">'...'</span><span class="ct-f25d6a">;</span></span><span class="line"></span><span class="line"><span class="ct-04e485">// write-methods requires private key</span></span><span class="line"><span class="ct-6a6b94">const</span><span class="ct-08c842"> </span><span class="ct-ce6629">executeContractMethod</span><span class="ct-08c842"> </span><span class="ct-3d4b19">=</span><span class="ct-08c842"> </span><span class="ct-6a6b94">async</span><span class="ct-08c842"> (</span><span class="ct-895378">val</span><span class="ct-3d4b19">:</span><span class="ct-08c842"> </span><span class="ct-1ed67f">number</span><span class="ct-08c842">) </span><span class="ct-6a6b94">=></span><span class="ct-08c842"> {</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-253c68">const</span><span class="ct-f25d6a"> </span><span class="ct-10950e">transaction</span><span class="ct-f25d6a"> </span><span class="ct-167112">=</span><span class="ct-f25d6a"> </span><span class="ct-78b2a1">contract</span><span class="ct-f25d6a">.</span><span class="ct-78b2a1">methods</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">store</span><span class="ct-f25d6a">(</span><span class="ct-78b2a1">val</span><span class="ct-f25d6a">);</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-253c68">const</span><span class="ct-f25d6a"> </span><span class="ct-10950e">account</span><span class="ct-f25d6a"> </span><span class="ct-167112">=</span><span class="ct-f25d6a"> </span><span class="ct-78b2a1">web3</span><span class="ct-f25d6a">.</span><span class="ct-78b2a1">eth</span><span class="ct-f25d6a">.</span><span class="ct-78b2a1">accounts</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">privateKeyToAccount</span><span class="ct-f25d6a">(</span><span class="ct-78b2a1">privateKey</span><span class="ct-f25d6a">);</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-253c68">const</span><span class="ct-f25d6a"> </span><span class="ct-10950e">options</span><span class="ct-f25d6a"> </span><span class="ct-167112">=</span><span class="ct-f25d6a"> {</span></span><span class="line"><span class="ct-f25d6a"> to: </span><span class="ct-10950e">CONTRACT_ADDRESS</span><span class="ct-f25d6a">,</span></span><span class="line"><span class="ct-f25d6a"> data: </span><span class="ct-78b2a1">transaction</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">encodeABI</span><span class="ct-f25d6a">(),</span></span><span class="line"><span class="ct-f25d6a"> gas: </span><span class="ct-167112">await</span><span class="ct-f25d6a"> </span><span class="ct-78b2a1">transaction</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">estimateGas</span><span class="ct-f25d6a">({ from: </span><span class="ct-78b2a1">account</span><span class="ct-f25d6a">.</span><span class="ct-78b2a1">address</span><span class="ct-f25d6a"> }),</span></span><span class="line"><span class="ct-f25d6a"> gasPrice: </span><span class="ct-167112">await</span><span class="ct-f25d6a"> </span><span class="ct-78b2a1">web3</span><span class="ct-f25d6a">.</span><span class="ct-78b2a1">eth</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">getGasPrice</span><span class="ct-f25d6a">(),</span></span><span class="line"><span class="ct-f25d6a"> };</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-253c68">const</span><span class="ct-f25d6a"> </span><span class="ct-10950e">signed</span><span class="ct-f25d6a"> </span><span class="ct-167112">=</span><span class="ct-f25d6a"> </span><span class="ct-167112">await</span><span class="ct-f25d6a"> </span><span class="ct-78b2a1">web3</span><span class="ct-f25d6a">.</span><span class="ct-78b2a1">eth</span><span class="ct-f25d6a">.</span><span class="ct-78b2a1">accounts</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">signTransaction</span><span class="ct-f25d6a">(</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-78b2a1">options</span><span class="ct-f25d6a">,</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-78b2a1">privateKey</span><span class="ct-f25d6a">,</span></span><span class="line"><span class="ct-f25d6a"> );</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-167112">await</span><span class="ct-f25d6a"> </span><span class="ct-78b2a1">web3</span><span class="ct-f25d6a">.</span><span class="ct-78b2a1">eth</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">sendSignedTransaction</span><span class="ct-f25d6a">(</span><span class="ct-78b2a1">signed</span><span class="ct-f25d6a">.</span><span class="ct-78b2a1">rawTransaction</span><span class="ct-167112">!</span><span class="ct-f25d6a">);</span></span><span class="line"><span class="ct-f25d6a">};</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-f25d6a"> </span><span class="ct-253c68">const</span><span class="ct-f25d6a"> </span><span class="ct-10950e">requests</span><span class="ct-f25d6a"> </span><span class="ct-167112">=</span><span class="ct-f25d6a"> [</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-78b2a1">contract</span><span class="ct-f25d6a">.</span><span class="ct-78b2a1">method</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">balanceOf</span><span class="ct-f25d6a">().</span><span class="ct-78b2a1">call</span><span class="ct-f25d6a">,</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-78b2a1">contract</span><span class="ct-f25d6a">.</span><span class="ct-78b2a1">method</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">getStaked</span><span class="ct-f25d6a">().</span><span class="ct-78b2a1">call</span></span><span class="line"><span class="ct-f25d6a"> ]</span></span><span class="line"></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-253c68">const</span><span class="ct-f25d6a"> </span><span class="ct-10950e">result</span><span class="ct-f25d6a"> </span><span class="ct-167112">=</span><span class="ct-f25d6a"> </span><span class="ct-167112">await</span><span class="ct-f25d6a"> </span><span class="ct-d8533d">makeBatchRequest</span><span class="ct-f25d6a">(</span><span class="ct-78b2a1">request</span><span class="ct-f25d6a">);</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-253c68">const</span><span class="ct-f25d6a"> </span><span class="ct-10950e">web3</span><span class="ct-f25d6a"> </span><span class="ct-167112">=</span><span class="ct-f25d6a"> </span><span class="ct-167112">new</span><span class="ct-f25d6a"> </span><span class="ct-d8533d">Web3</span><span class="ct-f25d6a">(</span><span class="ct-78b2a1">Web3</span><span class="ct-f25d6a">.</span><span class="ct-78b2a1">givenProvider</span><span class="ct-f25d6a"> </span><span class="ct-167112">||</span><span class="ct-f25d6a"> </span><span class="ct-10950e">PROVIDER_URL</span><span class="ct-f25d6a">);</span></span><span class="line"></span><span class="line"><span class="ct-6a6b94">const</span><span class="ct-08c842"> </span><span class="ct-ce6629">makeBatchRequest</span><span class="ct-08c842"> </span><span class="ct-3d4b19">=</span><span class="ct-08c842"> (</span><span class="ct-895378">calls</span><span class="ct-3d4b19">:</span><span class="ct-08c842"> </span><span class="ct-1ed67f">any</span><span class="ct-08c842">[]) </span><span class="ct-6a6b94">=></span><span class="ct-08c842"> {</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-167112">try</span><span class="ct-f25d6a"> {</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-253c68">const</span><span class="ct-f25d6a"> </span><span class="ct-10950e">web3</span><span class="ct-f25d6a"> </span><span class="ct-167112">=</span><span class="ct-f25d6a"> </span><span class="ct-d8533d">getWeb3NoAccount</span><span class="ct-f25d6a">();</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-253c68">const</span><span class="ct-f25d6a"> </span><span class="ct-10950e">batch</span><span class="ct-f25d6a"> </span><span class="ct-167112">=</span><span class="ct-f25d6a"> </span><span class="ct-167112">new</span><span class="ct-f25d6a"> </span><span class="ct-78b2a1">web3</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">BatchRequest</span><span class="ct-f25d6a">();</span></span><span class="line"></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-253c68">const</span><span class="ct-f25d6a"> </span><span class="ct-10950e">promises</span><span class="ct-f25d6a"> </span><span class="ct-167112">=</span><span class="ct-f25d6a"> </span><span class="ct-78b2a1">calls</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">map</span><span class="ct-253c68">=></span><span class="ct-f25d6a"> {</span></span><span class="line"><span class="ct-08c842"> </span><span class="ct-3d4b19">return</span><span class="ct-08c842"> </span><span class="ct-3d4b19">new</span><span class="ct-08c842"> </span><span class="ct-1ed67f">Promise</span><span class="ct-08c842">((</span><span class="ct-895378">resolve</span><span class="ct-08c842">, </span><span class="ct-895378">reject</span><span class="ct-08c842">) </span><span class="ct-6a6b94">=></span><span class="ct-08c842"> {</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-78b2a1">batch</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">add</span><span class="ct-f25d6a">(</span></span><span class="line"></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-167112">if</span><span class="ct-f25d6a"> (</span><span class="ct-78b2a1">err</span><span class="ct-f25d6a">) {</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-d8533d">reject</span><span class="ct-f25d6a">(</span><span class="ct-78b2a1">err</span><span class="ct-f25d6a">);</span></span><span class="line"><span class="ct-f25d6a"> } </span><span class="ct-167112">else</span><span class="ct-f25d6a"> {</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-d8533d">resolve</span><span class="ct-f25d6a">(</span><span class="ct-78b2a1">result</span><span class="ct-f25d6a">);</span></span><span class="line"><span class="ct-f25d6a"> }</span></span><span class="line"><span class="ct-f25d6a"> })</span></span><span class="line"><span class="ct-f25d6a"> );</span></span><span class="line"><span class="ct-f25d6a"> });</span></span><span class="line"><span class="ct-f25d6a"> });</span></span><span class="line"></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-78b2a1">batch</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">execute</span><span class="ct-f25d6a">();</span></span><span class="line"></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-167112">return</span><span class="ct-f25d6a"> </span><span class="ct-a3e375">Promise</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">all</span><span class="ct-f25d6a">(</span><span class="ct-78b2a1">promises</span><span class="ct-f25d6a">);</span></span><span class="line"><span class="ct-f25d6a"> } </span><span class="ct-167112">catch</span><span class="ct-f25d6a"> {</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-167112">return</span><span class="ct-f25d6a"> </span><span class="ct-a60ae2">null</span><span class="ct-f25d6a">;</span></span><span class="line"><span class="ct-f25d6a"> }</span></span><span class="line"><span class="ct-f25d6a">};</span></span><span class="line"></span><span class="line"><span class="ct-167112">export</span><span class="ct-605c85"> </span><span class="ct-167112">default</span><span class="ct-605c85"> </span><span class="ct-78b2a1">makeBatchRequest</span><span class="ct-f25d6a">;</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-f25d6a"> </span><span class="ct-167112">import</span><span class="ct-f25d6a"> </span><span class="ct-78b2a1">Web3</span><span class="ct-f25d6a"> </span><span class="ct-167112">from</span><span class="ct-f25d6a"> </span><span class="ct-7ab707">'web3'</span><span class="ct-f25d6a">;</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-253c68">const</span><span class="ct-f25d6a"> </span><span class="ct-10950e">web3</span><span class="ct-f25d6a"> </span><span class="ct-167112">=</span><span class="ct-f25d6a"> </span><span class="ct-167112">new</span><span class="ct-f25d6a"> </span><span class="ct-d8533d">Web3</span><span class="ct-f25d6a">(</span><span class="ct-7ab707">'YOUR_RPC_ENDPOINT_HERE'</span><span class="ct-f25d6a">);</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-253c68">const</span><span class="ct-f25d6a"> </span><span class="ct-10950e">ABI</span><span class="ct-f25d6a"> </span><span class="ct-167112">=</span><span class="ct-f25d6a"> </span><span class="ct-7ab707">'YOUR ABI HERE'</span><span class="ct-f25d6a">;</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-253c68">const</span><span class="ct-f25d6a"> </span><span class="ct-10950e">CONTRACT_ADDRESS</span><span class="ct-f25d6a"> </span><span class="ct-167112">=</span><span class="ct-f25d6a"> </span><span class="ct-7ab707">'YOUR CONTRACT ADDRESS HERE'</span><span class="ct-f25d6a">;</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-253c68">const</span><span class="ct-f25d6a"> </span><span class="ct-10950e">myContract</span><span class="ct-f25d6a"> </span><span class="ct-167112">=</span><span class="ct-f25d6a"> </span><span class="ct-167112">new</span><span class="ct-f25d6a"> </span><span class="ct-78b2a1">Web3</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">Contract</span><span class="ct-f25d6a">(</span><span class="ct-10950e">ABI</span><span class="ct-f25d6a">, </span><span class="ct-10950e">CONTRACT_ADDRESS</span><span class="ct-f25d6a">);</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-78b2a1">referralProgramContract</span><span class="ct-f25d6a">.</span><span class="ct-78b2a1">events</span></span><span class="line"><span class="ct-f25d6a"> .</span><span class="ct-d8533d">RegisterUser</span><span class="ct-f25d6a">()</span></span><span class="line"><span class="ct-08c842"> .</span><span class="ct-ce6629">on</span><span class="ct-08c842">(</span><span class="ct-5a3490">'connected'</span><span class="ct-08c842">, (</span><span class="ct-895378">subscriptionId</span><span class="ct-3d4b19">:</span><span class="ct-08c842"> </span><span class="ct-1ed67f">string</span><span class="ct-08c842">) </span><span class="ct-6a6b94">=></span><span class="ct-08c842"> {</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-78b2a1">console</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">log</span><span class="ct-f25d6a">(</span><span class="ct-7ab707">`| UserRegistered | events | ${</span><span class="ct-78b2a1">subscriptionId</span><span class="ct-7ab707">}`</span><span class="ct-f25d6a">);</span></span><span class="line"><span class="ct-f25d6a"> })</span></span><span class="line"><span class="ct-f25d6a"> .</span><span class="ct-d8533d">on</span><span class="ct-f25d6a">(</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-7ab707">'data'</span><span class="ct-f25d6a">,</span></span><span class="line"><span class="ct-08c842"> </span><span class="ct-6a6b94">async</span><span class="ct-08c842"> (</span><span class="ct-895378">event</span><span class="ct-3d4b19">:</span><span class="ct-08c842"> {</span></span><span class="line"><span class="ct-08c842"> </span><span class="ct-895378">removed</span><span class="ct-3d4b19">:</span><span class="ct-08c842"> </span><span class="ct-1ed67f">boolean</span><span class="ct-08c842">;</span></span><span class="line"><span class="ct-08c842"> </span><span class="ct-895378">returnValues</span><span class="ct-3d4b19">:</span><span class="ct-08c842"> </span><span class="ct-e2e842">RegisterUserResponseInterface</span><span class="ct-08c842">;</span></span><span class="line"><span class="ct-f25d6a"> }) </span><span class="ct-253c68">=></span><span class="ct-f25d6a"> {</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-167112">try</span><span class="ct-f25d6a"> {</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-167112">if</span><span class="ct-f25d6a"> (</span><span class="ct-78b2a1">event</span><span class="ct-f25d6a">.</span><span class="ct-78b2a1">removed</span><span class="ct-f25d6a">) {</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-167112">return</span><span class="ct-f25d6a">;</span></span><span class="line"><span class="ct-f25d6a"> }</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-253c68">const</span><span class="ct-f25d6a"> { </span><span class="ct-10950e">user</span><span class="ct-f25d6a">, </span><span class="ct-10950e">referrer</span><span class="ct-f25d6a"> } </span><span class="ct-167112">=</span><span class="ct-f25d6a"> </span><span class="ct-78b2a1">event</span><span class="ct-f25d6a">.</span><span class="ct-78b2a1">returnValues</span><span class="ct-f25d6a">;</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-78b2a1">console</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">log</span><span class="ct-f25d6a">(</span><span class="ct-78b2a1">user</span><span class="ct-f25d6a">, </span><span class="ct-78b2a1">referrer</span><span class="ct-f25d6a">);</span></span><span class="line"><span class="ct-f25d6a"> } </span><span class="ct-167112">catch</span><span class="ct-f25d6a"> (</span><span class="ct-78b2a1">e</span><span class="ct-f25d6a">) {</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-78b2a1">console</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">log</span><span class="ct-f25d6a">(</span><span class="ct-7ab707">`| ONCE | ${</span><span class="ct-78b2a1">e</span><span class="ct-7ab707">}`</span><span class="ct-f25d6a">);</span></span><span class="line"><span class="ct-f25d6a"> }</span></span><span class="line"><span class="ct-f25d6a"> },</span></span><span class="line"><span class="ct-f25d6a"> )</span></span><span class="line"><span class="ct-08c842"> .</span><span class="ct-ce6629">on</span><span class="ct-08c842">(</span><span class="ct-5a3490">'error'</span><span class="ct-08c842">, (</span><span class="ct-895378">error</span><span class="ct-3d4b19">:</span><span class="ct-08c842"> </span><span class="ct-e2e842">ErrnoException</span><span class="ct-08c842">) </span><span class="ct-6a6b94">=></span><span class="ct-08c842"> {</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-78b2a1">console</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">log</span><span class="ct-f25d6a">(</span><span class="ct-78b2a1">error</span><span class="ct-f25d6a">);</span></span><span class="line"><span class="ct-f25d6a"> });</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-f25d6a"> </span><span class="ct-253c68">let</span><span class="ct-f25d6a"> </span><span class="ct-78b2a1">options</span><span class="ct-f25d6a"> </span><span class="ct-167112">=</span><span class="ct-f25d6a"> {</span></span><span class="line"><span class="ct-f25d6a"> filter: {</span></span><span class="line"><span class="ct-f25d6a"> value: [],</span></span><span class="line"><span class="ct-f25d6a"> },</span></span><span class="line"><span class="ct-f25d6a"> fromBlock: </span><span class="ct-5788b0">0</span></span><span class="line"><span class="ct-f25d6a"> };</span></span><span class="line"></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-78b2a1">myContract</span><span class="ct-f25d6a">.</span><span class="ct-78b2a1">events</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">Transfer</span><span class="ct-f25d6a">(</span><span class="ct-78b2a1">options</span><span class="ct-f25d6a">)</span></span><span class="line"><span class="ct-f25d6a"> .</span><span class="ct-d8533d">on</span><span class="ct-f25d6a">(</span><span class="ct-7ab707">'data'</span><span class="ct-f25d6a"> </span><span class="ct-d8533d">log</span><span class="ct-f25d6a">(</span><span class="ct-78b2a1">event</span><span class="ct-f25d6a">))</span></span><span class="line"><span class="ct-f25d6a"> .</span><span class="ct-d8533d">on</span><span class="ct-f25d6a">(</span><span class="ct-7ab707">'changed'</span><span class="ct-f25d6a"> </span><span class="ct-d8533d">log</span><span class="ct-f25d6a">(</span><span class="ct-78b2a1">changed</span><span class="ct-f25d6a">))</span></span><span class="line"><span class="ct-f25d6a"> .</span><span class="ct-d8533d">on</span><span class="ct-f25d6a">(</span><span class="ct-7ab707">'error'</span><span class="ct-f25d6a"> </span></span><span class="line"><span class="ct-f25d6a"> .</span><span class="ct-d8533d">on</span><span class="ct-f25d6a">(</span><span class="ct-7ab707">'connected'</span><span class="ct-f25d6a"> </span><span class="ct-d8533d">log</span><span class="ct-f25d6a">(</span><span class="ct-78b2a1">str</span><span class="ct-f25d6a">))</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-f25d6a"> </span><span class="ct-253c68">let</span><span class="ct-f25d6a"> </span><span class="ct-78b2a1">options</span><span class="ct-f25d6a"> </span><span class="ct-167112">=</span><span class="ct-f25d6a"> {</span></span><span class="line"><span class="ct-f25d6a"> fromBlock: </span><span class="ct-5788b0">0</span><span class="ct-f25d6a">,</span></span><span class="line"><span class="ct-f25d6a"> address: [</span><span class="ct-7ab707">'address-1'</span><span class="ct-f25d6a">, </span><span class="ct-7ab707">'address-2'</span><span class="ct-f25d6a">], </span><span class="ct-04e485">//Only get events from specific addresses</span></span><span class="line"><span class="ct-f25d6a"> topics: [] </span><span class="ct-04e485">//What topics to subscribe to</span></span><span class="line"><span class="ct-f25d6a"> };</span></span><span class="line"></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-253c68">let</span><span class="ct-f25d6a"> </span><span class="ct-78b2a1">subscription</span><span class="ct-f25d6a"> </span><span class="ct-167112">=</span><span class="ct-f25d6a"> (</span><span class="ct-7ab707">'logs'</span><span class="ct-f25d6a">, </span><span class="ct-78b2a1">options</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-167112">if</span><span class="ct-f25d6a"> (</span><span class="ct-167112">!</span><span class="ct-78b2a1">err</span><span class="ct-f25d6a">)</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-78b2a1">console</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">log</span><span class="ct-f25d6a">(</span><span class="ct-78b2a1">event</span><span class="ct-f25d6a">)</span></span><span class="line"><span class="ct-f25d6a"> });</span></span><span class="line"></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-78b2a1">subscription</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">on</span><span class="ct-f25d6a">(</span><span class="ct-7ab707">'data'</span><span class="ct-253c68">=></span><span class="ct-f25d6a"> </span><span class="ct-78b2a1">console</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">log</span><span class="ct-f25d6a">(</span><span class="ct-78b2a1">event</span><span class="ct-f25d6a">))</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-78b2a1">subscription</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">on</span><span class="ct-f25d6a">(</span><span class="ct-7ab707">'changed'</span><span class="ct-253c68">=></span><span class="ct-f25d6a"> </span><span class="ct-78b2a1">console</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">log</span><span class="ct-f25d6a">(</span><span class="ct-78b2a1">changed</span><span class="ct-f25d6a">))</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-78b2a1">subscription</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">on</span><span class="ct-f25d6a">(</span><span class="ct-7ab707">'error'</span><span class="ct-253c68">=></span><span class="ct-f25d6a"> { </span><span class="ct-167112">throw</span><span class="ct-f25d6a"> </span><span class="ct-78b2a1">err</span><span class="ct-f25d6a"> })</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-78b2a1">subscription</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">on</span><span class="ct-f25d6a">(</span><span class="ct-7ab707">'connected'</span><span class="ct-253c68">=></span><span class="ct-f25d6a"> </span><span class="ct-78b2a1">console</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">log</span><span class="ct-f25d6a">(</span><span class="ct-78b2a1">nr</span><span class="ct-f25d6a">))</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-f25d6a"> </span><span class="ct-04e485">//example options(optional)</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-253c68">let</span><span class="ct-f25d6a"> </span><span class="ct-78b2a1">options</span><span class="ct-f25d6a"> </span><span class="ct-167112">=</span><span class="ct-f25d6a"> {</span></span><span class="line"><span class="ct-f25d6a"> filter: {</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-04e485">// only get events where transfer value was 1000 or 1337</span></span><span class="line"><span class="ct-f25d6a"> value: [</span><span class="ct-7ab707">'1000'</span><span class="ct-f25d6a">, </span><span class="ct-7ab707">'1337'</span><span class="ct-f25d6a">] </span></span><span class="line"><span class="ct-f25d6a"> },</span></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-04e485">// number | "earliest" | "pending" | "latest"</span></span><span class="line"><span class="ct-f25d6a"> fromBlock: </span><span class="ct-5788b0">0</span><span class="ct-f25d6a">, </span></span><span class="line"><span class="ct-f25d6a"> toBlock: </span><span class="ct-7ab707">'latest'</span></span><span class="line"><span class="ct-f25d6a"> };</span></span><span class="line"></span><span class="line"><span class="ct-f25d6a"> </span><span class="ct-78b2a1">myContract</span><span class="ct-f25d6a">.</span><span class="ct-d8533d">getPastEvents</span><span class="ct-f25d6a">(</span><span class="ct-7ab707">'Transfer'</span><span class="ct-f25d6a">, </span><span class="ct-78b2a1">options</span><span class="ct-f25d6a">)</span></span><span class="line"><span class="ct-f25d6a"> .</span><span class="ct-d8533d">then</span><span class="ct-f25d6a"> </span><span class="ct-d8533d">log</span><span class="ct-f25d6a">(</span><span class="ct-78b2a1">results</span><span class="ct-f25d6a">))</span></span><span class="line"><span class="ct-f25d6a"> .</span><span class="ct-d8533d">catch</span><span class="ct-f25d6a"> </span></span></code></pre><!--]--></div><style>.ct-e2e842{color:#FFA657}.ct-5a3490{color:#A5D6FF}.ct-a60ae2{color:#79C0FF}.ct-a3e375{color:#79C0FF}.ct-5788b0{color:#79C0FF}.ct-10950e{color:#79C0FF}.ct-253c68{color:#FF7B72}.ct-04e485{color:#8B949E}.ct-605c85{color:#FFA657}.ct-d8533d{color:#D2A8FF}.ct-4f83aa{color:#79C0FF}.ct-0359ef{color:#79C0FF}.ct-1ed67f{color:#79C0FF}.ct-895378{color:#FFA657}.ct-3d4b19{color:#FF7B72}.ct-ce6629{color:#D2A8FF}.ct-08c842{color:#C9D1D9}.ct-6a6b94{color:#FF7B72}.ct-7ab707{color:#A5D6FF}.ct-78b2a1{color:#C9D1D9}.ct-f25d6a{color:#C9D1D9}.ct-167112{color:#FF7B72}.light .ct-167112{color:#859900}.light .ct-f25d6a{color:#657B83}.light .ct-78b2a1{color:#268BD2}.light .ct-7ab707{color:#2AA198}.light .ct-6a6b94{color:#073642}.light .ct-08c842{color:#657B83}.light .ct-ce6629{color:#268BD2}.light .ct-3d4b19{color:#859900}.light .ct-895378{color:#657B83}.light .ct-1ed67f{color:#859900}.light .ct-0359ef{color:#268BD2}.light .ct-4f83aa{color:#657B83}.light .ct-d8533d{color:#268BD2}.light .ct-605c85{color:#657B83}.light .ct-04e485{color:#93A1A1}.light .ct-253c68{color:#073642}.light .ct-10950e{color:#268BD2}.light .ct-5788b0{color:#D33682}.light .ct-a3e375{color:#859900}.light .ct-a60ae2{color:#B58900}.light .ct-5a3490{color:#2AA198}.light .ct-e2e842{color:#268BD2}</style></div></article><!--]--></main><!--]--><!--]--></div><footer class="_footer_ogxvf_1 _footer_vom09_18 _footer_vom09_18"><div>btw, have a nice day</div><div class="_filler_ogxvf_9"></div><div> (2018 - 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