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_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-cc76f5">import</span><span class="ct-da9ff9"> { </span><span class="ct-a088a9">Contract</span><span class="ct-da9ff9"> } </span><span class="ct-cc76f5">from</span><span class="ct-da9ff9"> </span><span class="ct-bf1869">'web3-eth-contract'</span><span class="ct-da9ff9">;</span></span><span class="line"><span class="ct-cc76f5">import</span><span class="ct-da9ff9"> { </span><span class="ct-a088a9">web3</span><span class="ct-da9ff9"> } </span><span class="ct-cc76f5">from</span><span class="ct-da9ff9"> </span><span class="ct-bf1869">'.'</span><span class="ct-da9ff9">;</span></span><span class="line"></span><span class="line"><span class="ct-7073a8">const</span><span class="ct-73590f"> </span><span class="ct-0a0282">getContract</span><span class="ct-73590f"> </span><span class="ct-cb615d">=</span><span class="ct-73590f"> (</span><span class="ct-074561">abi</span><span class="ct-cb615d">:</span><span class="ct-73590f"> </span><span class="ct-bdb13a">object</span><span class="ct-73590f">, </span><span class="ct-074561">address</span><span class="ct-cb615d">?:</span><span class="ct-73590f"> </span><span class="ct-bdb13a">string</span><span class="ct-73590f">)</span><span class="ct-cb615d">:</span><span class="ct-73590f"> </span><span class="ct-7073a8">=></span><span class="ct-73590f"> {</span></span><span class="line"><span class="ct-73590f"> </span><span class="ct-7073a8">const</span><span class="ct-73590f"> </span><span class="ct-7807d1">abiFromJson</span><span class="ct-73590f"> </span><span class="ct-cb615d">=</span><span class="ct-73590f"> </span><span class="ct-aea52c">JSON</span><span class="ct-73590f">.</span><span class="ct-7807d1">parse</span><span class="ct-73590f">(</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-cc76f5">return</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">new</span><span class="ct-da9ff9"> </span><span class="ct-a088a9">web3</span><span class="ct-da9ff9">.</span><span class="ct-a088a9">eth</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">Contract</span><span class="ct-da9ff9">(</span><span class="ct-a088a9">abiFromJson</span><span class="ct-da9ff9">, </span><span class="ct-a088a9">address</span><span class="ct-da9ff9">);</span></span><span class="line"><span class="ct-da9ff9">};</span></span><span class="line"></span><span class="line"><span class="ct-cc76f5">export</span><span class="ct-165613"> </span><span class="ct-cc76f5">default</span><span class="ct-165613"> </span><span class="ct-a088a9">getContract</span><span class="ct-da9ff9">;</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-9bf2d7">// see example below</span></span><span class="line"><span class="ct-cc76f5">import</span><span class="ct-da9ff9"> { </span><span class="ct-a088a9">getContract</span><span class="ct-da9ff9"> } </span><span class="ct-cc76f5">from</span><span class="ct-da9ff9"> </span><span class="ct-bf1869">'.'</span><span class="ct-da9ff9">;</span></span><span class="line"></span><span class="line"><span class="ct-9bf2d7">// ABI of contract</span></span><span class="line"><span class="ct-e7cc18">const</span><span class="ct-da9ff9"> </span><span class="ct-764096">CONTRACT_ABI</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> { </span><span class="ct-9bf2d7">/* ... */</span><span class="ct-da9ff9"> };</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-9bf2d7">// address for contract</span></span><span class="line"><span class="ct-e7cc18">const</span><span class="ct-da9ff9"> </span><span class="ct-764096">CONTRACT_ADDRESS</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> </span><span class="ct-bf1869">'0xdea164f67df4dbfe675d5271c9d404e0260f33bb'</span><span class="ct-da9ff9">;</span></span><span class="line"></span><span class="line"><span class="ct-cc76f5">export</span><span class="ct-da9ff9"> </span><span class="ct-e7cc18">const</span><span class="ct-da9ff9"> </span><span class="ct-4e268b">executeContractMethod</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> </span><span class="ct-e7cc18">async</span><span class="ct-da9ff9"> ({}) </span><span class="ct-e7cc18">=></span><span class="ct-da9ff9"> {</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-9bf2d7">// getting contract</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-e7cc18">const</span><span class="ct-da9ff9"> </span><span class="ct-764096">contract</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> </span><span class="ct-4e268b">getContract</span><span class="ct-da9ff9">(</span><span class="ct-764096">CONTRACT_ABI</span><span class="ct-da9ff9">, </span><span class="ct-764096">CONTRACT_ADDRESS</span><span class="ct-da9ff9">);</span></span><span class="line"><span class="ct-da9ff9"> </span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-9bf2d7">// Calling write method</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-cc76f5">try</span><span class="ct-da9ff9"> {</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-9bf2d7">// authorizing with Metamask</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-cc76f5">await</span><span class="ct-da9ff9"> </span><span class="ct-a088a9">web3</span><span class="ct-da9ff9">.</span><span class="ct-a088a9">currentProvider</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">request</span><span class="ct-da9ff9">({ method: </span><span class="ct-bf1869">'eth_requestAccounts'</span><span class="ct-da9ff9"> });</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-9bf2d7">// getting wallet address</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-e7cc18">const</span><span class="ct-da9ff9"> </span><span class="ct-764096">addressUser</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> </span><span class="ct-a088a9">web3</span><span class="ct-da9ff9">.</span><span class="ct-a088a9">currentProvider</span><span class="ct-da9ff9">.</span><span class="ct-a088a9">selectedAddress</span><span class="ct-da9ff9">;</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-9bf2d7">// calling "store" store method for contract</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-9bf2d7">// payload should include `from` address, that matches</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-9bf2d7">// current user's wallet</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-cc76f5">await</span><span class="ct-da9ff9"> </span><span class="ct-a088a9">contract</span><span class="ct-da9ff9">.</span><span class="ct-a088a9">methods</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">store</span><span class="ct-da9ff9">(</span><span class="ct-1346af">0</span><span class="ct-da9ff9">, </span><span class="ct-bf1869">'Parameter'</span><span class="ct-da9ff9">).</span><span class="ct-4e268b">send</span><span class="ct-da9ff9">({</span></span><span class="line"><span class="ct-da9ff9"> from: </span><span class="ct-a088a9">addressUser</span><span class="ct-da9ff9">,</span></span><span class="line"><span class="ct-da9ff9"> });</span></span><span class="line"><span class="ct-da9ff9"> } </span><span class="ct-cc76f5">catch</span><span class="ct-da9ff9"> (</span><span class="ct-a088a9">e</span><span class="ct-da9ff9">) {</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-cc76f5">throw</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">new</span><span class="ct-da9ff9"> </span><span class="ct-b67ab5">Error</span><span class="ct-da9ff9">(</span><span class="ct-a088a9">e</span><span class="ct-da9ff9">);</span></span><span class="line"><span class="ct-da9ff9"> }</span></span><span class="line"><span class="ct-da9ff9"> </span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-9bf2d7">// calling read method</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-cc76f5">try</span><span class="ct-da9ff9"> {</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-9bf2d7">// this method can return data</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-e7cc18">const</span><span class="ct-da9ff9"> </span><span class="ct-764096">result</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">await</span><span class="ct-da9ff9"> </span><span class="ct-a088a9">contract</span><span class="ct-da9ff9">.</span><span class="ct-a088a9">methods</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">retrieve</span><span class="ct-da9ff9">().</span><span class="ct-4e268b">call</span><span class="ct-da9ff9">();</span></span><span class="line"><span class="ct-da9ff9"> } </span><span class="ct-cc76f5">catch</span><span class="ct-da9ff9"> (</span><span class="ct-a088a9">e</span><span class="ct-da9ff9">) {</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-cc76f5">throw</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">new</span><span class="ct-da9ff9"> </span><span class="ct-b67ab5">Error</span><span class="ct-da9ff9">(</span><span class="ct-a088a9">e</span><span class="ct-da9ff9">);</span></span><span class="line"><span class="ct-da9ff9"> }</span></span><span class="line"><span class="ct-da9ff9">}</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-9bf2d7">// see example below</span></span><span class="line"><span class="ct-cc76f5">import</span><span class="ct-da9ff9"> { </span><span class="ct-a088a9">getContract</span><span class="ct-da9ff9"> } </span><span class="ct-cc76f5">from</span><span class="ct-da9ff9"> </span><span class="ct-bf1869">'.'</span><span class="ct-da9ff9">;</span></span><span class="line"></span><span class="line"><span class="ct-9bf2d7">// ABI контракта</span></span><span class="line"><span class="ct-e7cc18">const</span><span class="ct-da9ff9"> </span><span class="ct-764096">CONTRACT_ABI</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> { </span><span class="ct-9bf2d7">/* ... */</span><span class="ct-da9ff9"> };</span></span><span class="line"><span class="ct-9bf2d7">// contract address</span></span><span class="line"><span class="ct-e7cc18">const</span><span class="ct-da9ff9"> </span><span class="ct-764096">CONTRACT_ADDRESS</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> </span><span class="ct-bf1869">'0xdea164f67df4dbfe675d5271c9d404e0260f33bb'</span><span class="ct-da9ff9">;</span></span><span class="line"><span class="ct-9bf2d7">// getting contract</span></span><span class="line"><span class="ct-e7cc18">const</span><span class="ct-da9ff9"> </span><span class="ct-764096">contract</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> </span><span class="ct-4e268b">getContract</span><span class="ct-da9ff9">(</span><span class="ct-764096">CONTRACT_ABI</span><span class="ct-da9ff9">, </span><span class="ct-764096">CONTRACT_ADDRESS</span><span class="ct-da9ff9">);</span></span><span class="line"><span class="ct-9bf2d7">// account's private key</span></span><span class="line"><span class="ct-e7cc18">const</span><span class="ct-da9ff9"> </span><span class="ct-764096">privateKey</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> </span><span class="ct-bf1869">'...'</span><span class="ct-da9ff9">;</span></span><span class="line"></span><span class="line"><span class="ct-9bf2d7">// write-methods requires private key</span></span><span class="line"><span class="ct-7073a8">const</span><span class="ct-73590f"> </span><span class="ct-0a0282">executeContractMethod</span><span class="ct-73590f"> </span><span class="ct-cb615d">=</span><span class="ct-73590f"> </span><span class="ct-7073a8">async</span><span class="ct-73590f"> (</span><span class="ct-074561">val</span><span class="ct-cb615d">:</span><span class="ct-73590f"> </span><span class="ct-bdb13a">number</span><span class="ct-73590f">) </span><span class="ct-7073a8">=></span><span class="ct-73590f"> {</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-e7cc18">const</span><span class="ct-da9ff9"> </span><span class="ct-764096">transaction</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> </span><span class="ct-a088a9">contract</span><span class="ct-da9ff9">.</span><span class="ct-a088a9">methods</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">store</span><span class="ct-da9ff9">(</span><span class="ct-a088a9">val</span><span class="ct-da9ff9">);</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-e7cc18">const</span><span class="ct-da9ff9"> </span><span class="ct-764096">account</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> </span><span class="ct-a088a9">web3</span><span class="ct-da9ff9">.</span><span class="ct-a088a9">eth</span><span class="ct-da9ff9">.</span><span class="ct-a088a9">accounts</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">privateKeyToAccount</span><span class="ct-da9ff9">(</span><span class="ct-a088a9">privateKey</span><span class="ct-da9ff9">);</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-e7cc18">const</span><span class="ct-da9ff9"> </span><span class="ct-764096">options</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> {</span></span><span class="line"><span class="ct-da9ff9"> to: </span><span class="ct-764096">CONTRACT_ADDRESS</span><span class="ct-da9ff9">,</span></span><span class="line"><span class="ct-da9ff9"> data: </span><span class="ct-a088a9">transaction</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">encodeABI</span><span class="ct-da9ff9">(),</span></span><span class="line"><span class="ct-da9ff9"> gas: </span><span class="ct-cc76f5">await</span><span class="ct-da9ff9"> </span><span class="ct-a088a9">transaction</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">estimateGas</span><span class="ct-da9ff9">({ from: </span><span class="ct-a088a9">account</span><span class="ct-da9ff9">.</span><span class="ct-a088a9">address</span><span class="ct-da9ff9"> }),</span></span><span class="line"><span class="ct-da9ff9"> gasPrice: </span><span class="ct-cc76f5">await</span><span class="ct-da9ff9"> </span><span class="ct-a088a9">web3</span><span class="ct-da9ff9">.</span><span class="ct-a088a9">eth</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">getGasPrice</span><span class="ct-da9ff9">(),</span></span><span class="line"><span class="ct-da9ff9"> };</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-e7cc18">const</span><span class="ct-da9ff9"> </span><span class="ct-764096">signed</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">await</span><span class="ct-da9ff9"> </span><span class="ct-a088a9">web3</span><span class="ct-da9ff9">.</span><span class="ct-a088a9">eth</span><span class="ct-da9ff9">.</span><span class="ct-a088a9">accounts</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">signTransaction</span><span class="ct-da9ff9">(</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-a088a9">options</span><span class="ct-da9ff9">,</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-a088a9">privateKey</span><span class="ct-da9ff9">,</span></span><span class="line"><span class="ct-da9ff9"> );</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-cc76f5">await</span><span class="ct-da9ff9"> </span><span class="ct-a088a9">web3</span><span class="ct-da9ff9">.</span><span class="ct-a088a9">eth</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">sendSignedTransaction</span><span class="ct-da9ff9">(</span><span class="ct-a088a9">signed</span><span class="ct-da9ff9">.</span><span class="ct-a088a9">rawTransaction</span><span class="ct-cc76f5">!</span><span class="ct-da9ff9">);</span></span><span class="line"><span class="ct-da9ff9">};</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-da9ff9"> </span><span class="ct-e7cc18">const</span><span class="ct-da9ff9"> </span><span class="ct-764096">requests</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> [</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-a088a9">contract</span><span class="ct-da9ff9">.</span><span class="ct-a088a9">method</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">balanceOf</span><span class="ct-da9ff9">().</span><span class="ct-a088a9">call</span><span class="ct-da9ff9">,</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-a088a9">contract</span><span class="ct-da9ff9">.</span><span class="ct-a088a9">method</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">getStaked</span><span class="ct-da9ff9">().</span><span class="ct-a088a9">call</span></span><span class="line"><span class="ct-da9ff9"> ]</span></span><span class="line"></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-e7cc18">const</span><span class="ct-da9ff9"> </span><span class="ct-764096">result</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">await</span><span class="ct-da9ff9"> </span><span class="ct-4e268b">makeBatchRequest</span><span class="ct-da9ff9">(</span><span class="ct-a088a9">request</span><span class="ct-da9ff9">);</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-e7cc18">const</span><span class="ct-da9ff9"> </span><span class="ct-764096">web3</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">new</span><span class="ct-da9ff9"> </span><span class="ct-4e268b">Web3</span><span class="ct-da9ff9">(</span><span class="ct-a088a9">Web3</span><span class="ct-da9ff9">.</span><span class="ct-a088a9">givenProvider</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">||</span><span class="ct-da9ff9"> </span><span class="ct-764096">PROVIDER_URL</span><span class="ct-da9ff9">);</span></span><span class="line"></span><span class="line"><span class="ct-7073a8">const</span><span class="ct-73590f"> </span><span class="ct-0a0282">makeBatchRequest</span><span class="ct-73590f"> </span><span class="ct-cb615d">=</span><span class="ct-73590f"> (</span><span class="ct-074561">calls</span><span class="ct-cb615d">:</span><span class="ct-73590f"> </span><span class="ct-bdb13a">any</span><span class="ct-73590f">[]) </span><span class="ct-7073a8">=></span><span class="ct-73590f"> {</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-cc76f5">try</span><span class="ct-da9ff9"> {</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-e7cc18">const</span><span class="ct-da9ff9"> </span><span class="ct-764096">web3</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> </span><span class="ct-4e268b">getWeb3NoAccount</span><span class="ct-da9ff9">();</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-e7cc18">const</span><span class="ct-da9ff9"> </span><span class="ct-764096">batch</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">new</span><span class="ct-da9ff9"> </span><span class="ct-a088a9">web3</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">BatchRequest</span><span class="ct-da9ff9">();</span></span><span class="line"></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-e7cc18">const</span><span class="ct-da9ff9"> </span><span class="ct-764096">promises</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> </span><span class="ct-a088a9">calls</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">map</span><span class="ct-e7cc18">=></span><span class="ct-da9ff9"> {</span></span><span class="line"><span class="ct-73590f"> </span><span class="ct-cb615d">return</span><span class="ct-73590f"> </span><span class="ct-cb615d">new</span><span class="ct-73590f"> </span><span class="ct-bdb13a">Promise</span><span class="ct-73590f">((</span><span class="ct-074561">resolve</span><span class="ct-73590f">, </span><span class="ct-074561">reject</span><span class="ct-73590f">) </span><span class="ct-7073a8">=></span><span class="ct-73590f"> {</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-a088a9">batch</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">add</span><span class="ct-da9ff9">(</span></span><span class="line"></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-cc76f5">if</span><span class="ct-da9ff9"> (</span><span class="ct-a088a9">err</span><span class="ct-da9ff9">) {</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-4e268b">reject</span><span class="ct-da9ff9">(</span><span class="ct-a088a9">err</span><span class="ct-da9ff9">);</span></span><span class="line"><span class="ct-da9ff9"> } </span><span class="ct-cc76f5">else</span><span class="ct-da9ff9"> {</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-4e268b">resolve</span><span class="ct-da9ff9">(</span><span class="ct-a088a9">result</span><span class="ct-da9ff9">);</span></span><span class="line"><span class="ct-da9ff9"> }</span></span><span class="line"><span class="ct-da9ff9"> })</span></span><span class="line"><span class="ct-da9ff9"> );</span></span><span class="line"><span class="ct-da9ff9"> });</span></span><span class="line"><span class="ct-da9ff9"> });</span></span><span class="line"></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-a088a9">batch</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">execute</span><span class="ct-da9ff9">();</span></span><span class="line"></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-cc76f5">return</span><span class="ct-da9ff9"> </span><span class="ct-b67ab5">Promise</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">all</span><span class="ct-da9ff9">(</span><span class="ct-a088a9">promises</span><span class="ct-da9ff9">);</span></span><span class="line"><span class="ct-da9ff9"> } </span><span class="ct-cc76f5">catch</span><span class="ct-da9ff9"> {</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-cc76f5">return</span><span class="ct-da9ff9"> </span><span class="ct-d67dd4">null</span><span class="ct-da9ff9">;</span></span><span class="line"><span class="ct-da9ff9"> }</span></span><span class="line"><span class="ct-da9ff9">};</span></span><span class="line"></span><span class="line"><span class="ct-cc76f5">export</span><span class="ct-165613"> </span><span class="ct-cc76f5">default</span><span class="ct-165613"> </span><span class="ct-a088a9">makeBatchRequest</span><span class="ct-da9ff9">;</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-da9ff9"> </span><span class="ct-cc76f5">import</span><span class="ct-da9ff9"> </span><span class="ct-a088a9">Web3</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">from</span><span class="ct-da9ff9"> </span><span class="ct-bf1869">'web3'</span><span class="ct-da9ff9">;</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-e7cc18">const</span><span class="ct-da9ff9"> </span><span class="ct-764096">web3</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">new</span><span class="ct-da9ff9"> </span><span class="ct-4e268b">Web3</span><span class="ct-da9ff9">(</span><span class="ct-bf1869">'YOUR_RPC_ENDPOINT_HERE'</span><span class="ct-da9ff9">);</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-e7cc18">const</span><span class="ct-da9ff9"> </span><span class="ct-764096">ABI</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> </span><span class="ct-bf1869">'YOUR ABI HERE'</span><span class="ct-da9ff9">;</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-e7cc18">const</span><span class="ct-da9ff9"> </span><span class="ct-764096">CONTRACT_ADDRESS</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> </span><span class="ct-bf1869">'YOUR CONTRACT ADDRESS HERE'</span><span class="ct-da9ff9">;</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-e7cc18">const</span><span class="ct-da9ff9"> </span><span class="ct-764096">myContract</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">new</span><span class="ct-da9ff9"> </span><span class="ct-a088a9">Web3</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">Contract</span><span class="ct-da9ff9">(</span><span class="ct-764096">ABI</span><span class="ct-da9ff9">, </span><span class="ct-764096">CONTRACT_ADDRESS</span><span class="ct-da9ff9">);</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-a088a9">referralProgramContract</span><span class="ct-da9ff9">.</span><span class="ct-a088a9">events</span></span><span class="line"><span class="ct-da9ff9"> .</span><span class="ct-4e268b">RegisterUser</span><span class="ct-da9ff9">()</span></span><span class="line"><span class="ct-73590f"> .</span><span class="ct-0a0282">on</span><span class="ct-73590f">(</span><span class="ct-915dc9">'connected'</span><span class="ct-73590f">, (</span><span class="ct-074561">subscriptionId</span><span class="ct-cb615d">:</span><span class="ct-73590f"> </span><span class="ct-bdb13a">string</span><span class="ct-73590f">) </span><span class="ct-7073a8">=></span><span class="ct-73590f"> {</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-a088a9">console</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">log</span><span class="ct-da9ff9">(</span><span class="ct-bf1869">`| UserRegistered | events | ${</span><span class="ct-a088a9">subscriptionId</span><span class="ct-bf1869">}`</span><span class="ct-da9ff9">);</span></span><span class="line"><span class="ct-da9ff9"> })</span></span><span class="line"><span class="ct-da9ff9"> .</span><span class="ct-4e268b">on</span><span class="ct-da9ff9">(</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-bf1869">'data'</span><span class="ct-da9ff9">,</span></span><span class="line"><span class="ct-73590f"> </span><span class="ct-7073a8">async</span><span class="ct-73590f"> (</span><span class="ct-074561">event</span><span class="ct-cb615d">:</span><span class="ct-73590f"> {</span></span><span class="line"><span class="ct-73590f"> </span><span class="ct-074561">removed</span><span class="ct-cb615d">:</span><span class="ct-73590f"> </span><span class="ct-bdb13a">boolean</span><span class="ct-73590f">;</span></span><span class="line"><span class="ct-73590f"> </span><span class="ct-074561">returnValues</span><span class="ct-cb615d">:</span><span class="ct-73590f"> </span><span class="ct-ad5ae3">RegisterUserResponseInterface</span><span class="ct-73590f">;</span></span><span class="line"><span class="ct-da9ff9"> }) </span><span class="ct-e7cc18">=></span><span class="ct-da9ff9"> {</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-cc76f5">try</span><span class="ct-da9ff9"> {</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-cc76f5">if</span><span class="ct-da9ff9"> (</span><span class="ct-a088a9">event</span><span class="ct-da9ff9">.</span><span class="ct-a088a9">removed</span><span class="ct-da9ff9">) {</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-cc76f5">return</span><span class="ct-da9ff9">;</span></span><span class="line"><span class="ct-da9ff9"> }</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-e7cc18">const</span><span class="ct-da9ff9"> { </span><span class="ct-764096">user</span><span class="ct-da9ff9">, </span><span class="ct-764096">referrer</span><span class="ct-da9ff9"> } </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> </span><span class="ct-a088a9">event</span><span class="ct-da9ff9">.</span><span class="ct-a088a9">returnValues</span><span class="ct-da9ff9">;</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-a088a9">console</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">log</span><span class="ct-da9ff9">(</span><span class="ct-a088a9">user</span><span class="ct-da9ff9">, </span><span class="ct-a088a9">referrer</span><span class="ct-da9ff9">);</span></span><span class="line"><span class="ct-da9ff9"> } </span><span class="ct-cc76f5">catch</span><span class="ct-da9ff9"> (</span><span class="ct-a088a9">e</span><span class="ct-da9ff9">) {</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-a088a9">console</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">log</span><span class="ct-da9ff9">(</span><span class="ct-bf1869">`| ONCE | ${</span><span class="ct-a088a9">e</span><span class="ct-bf1869">}`</span><span class="ct-da9ff9">);</span></span><span class="line"><span class="ct-da9ff9"> }</span></span><span class="line"><span class="ct-da9ff9"> },</span></span><span class="line"><span class="ct-da9ff9"> )</span></span><span class="line"><span class="ct-73590f"> .</span><span class="ct-0a0282">on</span><span class="ct-73590f">(</span><span class="ct-915dc9">'error'</span><span class="ct-73590f">, (</span><span class="ct-074561">error</span><span class="ct-cb615d">:</span><span class="ct-73590f"> </span><span class="ct-ad5ae3">ErrnoException</span><span class="ct-73590f">) </span><span class="ct-7073a8">=></span><span class="ct-73590f"> {</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-a088a9">console</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">log</span><span class="ct-da9ff9">(</span><span class="ct-a088a9">error</span><span class="ct-da9ff9">);</span></span><span class="line"><span class="ct-da9ff9"> });</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-da9ff9"> </span><span class="ct-e7cc18">let</span><span class="ct-da9ff9"> </span><span class="ct-a088a9">options</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> {</span></span><span class="line"><span class="ct-da9ff9"> filter: {</span></span><span class="line"><span class="ct-da9ff9"> value: [],</span></span><span class="line"><span class="ct-da9ff9"> },</span></span><span class="line"><span class="ct-da9ff9"> fromBlock: </span><span class="ct-1346af">0</span></span><span class="line"><span class="ct-da9ff9"> };</span></span><span class="line"></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-a088a9">myContract</span><span class="ct-da9ff9">.</span><span class="ct-a088a9">events</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">Transfer</span><span class="ct-da9ff9">(</span><span class="ct-a088a9">options</span><span class="ct-da9ff9">)</span></span><span class="line"><span class="ct-da9ff9"> .</span><span class="ct-4e268b">on</span><span class="ct-da9ff9">(</span><span class="ct-bf1869">'data'</span><span class="ct-da9ff9"> </span><span class="ct-4e268b">log</span><span class="ct-da9ff9">(</span><span class="ct-a088a9">event</span><span class="ct-da9ff9">))</span></span><span class="line"><span class="ct-da9ff9"> .</span><span class="ct-4e268b">on</span><span class="ct-da9ff9">(</span><span class="ct-bf1869">'changed'</span><span class="ct-da9ff9"> </span><span class="ct-4e268b">log</span><span class="ct-da9ff9">(</span><span class="ct-a088a9">changed</span><span class="ct-da9ff9">))</span></span><span class="line"><span class="ct-da9ff9"> .</span><span class="ct-4e268b">on</span><span class="ct-da9ff9">(</span><span class="ct-bf1869">'error'</span><span class="ct-da9ff9"> </span></span><span class="line"><span class="ct-da9ff9"> .</span><span class="ct-4e268b">on</span><span class="ct-da9ff9">(</span><span class="ct-bf1869">'connected'</span><span class="ct-da9ff9"> </span><span class="ct-4e268b">log</span><span class="ct-da9ff9">(</span><span class="ct-a088a9">str</span><span class="ct-da9ff9">))</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-da9ff9"> </span><span class="ct-e7cc18">let</span><span class="ct-da9ff9"> </span><span class="ct-a088a9">options</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> {</span></span><span class="line"><span class="ct-da9ff9"> fromBlock: </span><span class="ct-1346af">0</span><span class="ct-da9ff9">,</span></span><span class="line"><span class="ct-da9ff9"> address: [</span><span class="ct-bf1869">'address-1'</span><span class="ct-da9ff9">, </span><span class="ct-bf1869">'address-2'</span><span class="ct-da9ff9">], </span><span class="ct-9bf2d7">//Only get events from specific addresses</span></span><span class="line"><span class="ct-da9ff9"> topics: [] </span><span class="ct-9bf2d7">//What topics to subscribe to</span></span><span class="line"><span class="ct-da9ff9"> };</span></span><span class="line"></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-e7cc18">let</span><span class="ct-da9ff9"> </span><span class="ct-a088a9">subscription</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> (</span><span class="ct-bf1869">'logs'</span><span class="ct-da9ff9">, </span><span class="ct-a088a9">options</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-cc76f5">if</span><span class="ct-da9ff9"> (</span><span class="ct-cc76f5">!</span><span class="ct-a088a9">err</span><span class="ct-da9ff9">)</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-a088a9">console</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">log</span><span class="ct-da9ff9">(</span><span class="ct-a088a9">event</span><span class="ct-da9ff9">)</span></span><span class="line"><span class="ct-da9ff9"> });</span></span><span class="line"></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-a088a9">subscription</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">on</span><span class="ct-da9ff9">(</span><span class="ct-bf1869">'data'</span><span class="ct-e7cc18">=></span><span class="ct-da9ff9"> </span><span class="ct-a088a9">console</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">log</span><span class="ct-da9ff9">(</span><span class="ct-a088a9">event</span><span class="ct-da9ff9">))</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-a088a9">subscription</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">on</span><span class="ct-da9ff9">(</span><span class="ct-bf1869">'changed'</span><span class="ct-e7cc18">=></span><span class="ct-da9ff9"> </span><span class="ct-a088a9">console</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">log</span><span class="ct-da9ff9">(</span><span class="ct-a088a9">changed</span><span class="ct-da9ff9">))</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-a088a9">subscription</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">on</span><span class="ct-da9ff9">(</span><span class="ct-bf1869">'error'</span><span class="ct-e7cc18">=></span><span class="ct-da9ff9"> { </span><span class="ct-cc76f5">throw</span><span class="ct-da9ff9"> </span><span class="ct-a088a9">err</span><span class="ct-da9ff9"> })</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-a088a9">subscription</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">on</span><span class="ct-da9ff9">(</span><span class="ct-bf1869">'connected'</span><span class="ct-e7cc18">=></span><span class="ct-da9ff9"> </span><span class="ct-a088a9">console</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">log</span><span class="ct-da9ff9">(</span><span class="ct-a088a9">nr</span><span class="ct-da9ff9">))</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-da9ff9"> </span><span class="ct-9bf2d7">//example options(optional)</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-e7cc18">let</span><span class="ct-da9ff9"> </span><span class="ct-a088a9">options</span><span class="ct-da9ff9"> </span><span class="ct-cc76f5">=</span><span class="ct-da9ff9"> {</span></span><span class="line"><span class="ct-da9ff9"> filter: {</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-9bf2d7">// only get events where transfer value was 1000 or 1337</span></span><span class="line"><span class="ct-da9ff9"> value: [</span><span class="ct-bf1869">'1000'</span><span class="ct-da9ff9">, </span><span class="ct-bf1869">'1337'</span><span class="ct-da9ff9">] </span></span><span class="line"><span class="ct-da9ff9"> },</span></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-9bf2d7">// number | "earliest" | "pending" | "latest"</span></span><span class="line"><span class="ct-da9ff9"> fromBlock: </span><span class="ct-1346af">0</span><span class="ct-da9ff9">, </span></span><span class="line"><span class="ct-da9ff9"> toBlock: </span><span class="ct-bf1869">'latest'</span></span><span class="line"><span class="ct-da9ff9"> };</span></span><span class="line"></span><span class="line"><span class="ct-da9ff9"> </span><span class="ct-a088a9">myContract</span><span class="ct-da9ff9">.</span><span class="ct-4e268b">getPastEvents</span><span class="ct-da9ff9">(</span><span class="ct-bf1869">'Transfer'</span><span class="ct-da9ff9">, </span><span class="ct-a088a9">options</span><span class="ct-da9ff9">)</span></span><span class="line"><span class="ct-da9ff9"> .</span><span class="ct-4e268b">then</span><span class="ct-da9ff9"> </span><span class="ct-4e268b">log</span><span class="ct-da9ff9">(</span><span class="ct-a088a9">results</span><span class="ct-da9ff9">))</span></span><span class="line"><span class="ct-da9ff9"> .</span><span class="ct-4e268b">catch</span><span class="ct-da9ff9"> </span></span></code></pre><!--]--></div><style>.ct-ad5ae3{color:#FFA657}.ct-915dc9{color:#A5D6FF}.ct-d67dd4{color:#79C0FF}.ct-b67ab5{color:#79C0FF}.ct-1346af{color:#79C0FF}.ct-764096{color:#79C0FF}.ct-e7cc18{color:#FF7B72}.ct-9bf2d7{color:#8B949E}.ct-165613{color:#FFA657}.ct-4e268b{color:#D2A8FF}.ct-aea52c{color:#79C0FF}.ct-7807d1{color:#79C0FF}.ct-bdb13a{color:#79C0FF}.ct-074561{color:#FFA657}.ct-cb615d{color:#FF7B72}.ct-0a0282{color:#D2A8FF}.ct-73590f{color:#C9D1D9}.ct-7073a8{color:#FF7B72}.ct-bf1869{color:#A5D6FF}.ct-a088a9{color:#C9D1D9}.ct-da9ff9{color:#C9D1D9}.ct-cc76f5{color:#FF7B72}.light .ct-cc76f5{color:#859900}.light .ct-da9ff9{color:#657B83}.light .ct-a088a9{color:#268BD2}.light .ct-bf1869{color:#2AA198}.light .ct-7073a8{color:#073642}.light .ct-73590f{color:#657B83}.light .ct-0a0282{color:#268BD2}.light .ct-cb615d{color:#859900}.light .ct-074561{color:#657B83}.light .ct-bdb13a{color:#859900}.light .ct-7807d1{color:#268BD2}.light .ct-aea52c{color:#657B83}.light .ct-4e268b{color:#268BD2}.light .ct-165613{color:#657B83}.light .ct-9bf2d7{color:#93A1A1}.light .ct-e7cc18{color:#073642}.light .ct-764096{color:#268BD2}.light .ct-1346af{color:#D33682}.light .ct-b67ab5{color:#859900}.light .ct-d67dd4{color:#B58900}.light .ct-915dc9{color:#2AA198}.light .ct-ad5ae3{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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