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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-1ef187">import</span><span class="ct-fc252f"> { </span><span class="ct-56249b">Contract</span><span class="ct-fc252f"> } </span><span class="ct-1ef187">from</span><span class="ct-fc252f"> </span><span class="ct-9c9782">'web3-eth-contract'</span><span class="ct-fc252f">;</span></span><span class="line"><span class="ct-1ef187">import</span><span class="ct-fc252f"> { </span><span class="ct-56249b">web3</span><span class="ct-fc252f"> } </span><span class="ct-1ef187">from</span><span class="ct-fc252f"> </span><span class="ct-9c9782">'.'</span><span class="ct-fc252f">;</span></span><span class="line"></span><span class="line"><span class="ct-2690b3">const</span><span class="ct-177e39"> </span><span class="ct-bbedd3">getContract</span><span class="ct-177e39"> </span><span class="ct-f3c518">=</span><span class="ct-177e39"> (</span><span class="ct-bed189">abi</span><span class="ct-f3c518">:</span><span class="ct-177e39"> </span><span class="ct-82c1f9">object</span><span class="ct-177e39">, </span><span class="ct-bed189">address</span><span class="ct-f3c518">?:</span><span class="ct-177e39"> </span><span class="ct-82c1f9">string</span><span class="ct-177e39">)</span><span class="ct-f3c518">:</span><span class="ct-177e39"> </span><span class="ct-2690b3">=></span><span class="ct-177e39"> {</span></span><span class="line"><span class="ct-177e39"> </span><span class="ct-2690b3">const</span><span class="ct-177e39"> </span><span class="ct-d007af">abiFromJson</span><span class="ct-177e39"> </span><span class="ct-f3c518">=</span><span class="ct-177e39"> </span><span class="ct-c58381">JSON</span><span class="ct-177e39">.</span><span class="ct-d007af">parse</span><span class="ct-177e39">(</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-1ef187">return</span><span class="ct-fc252f"> </span><span class="ct-1ef187">new</span><span class="ct-fc252f"> </span><span class="ct-56249b">web3</span><span class="ct-fc252f">.</span><span class="ct-56249b">eth</span><span class="ct-fc252f">.</span><span class="ct-61346a">Contract</span><span class="ct-fc252f">(</span><span class="ct-56249b">abiFromJson</span><span class="ct-fc252f">, </span><span class="ct-56249b">address</span><span class="ct-fc252f">);</span></span><span class="line"><span class="ct-fc252f">};</span></span><span class="line"></span><span class="line"><span class="ct-1ef187">export</span><span class="ct-2e08a5"> </span><span class="ct-1ef187">default</span><span class="ct-2e08a5"> </span><span class="ct-56249b">getContract</span><span class="ct-fc252f">;</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-295134">// see example below</span></span><span class="line"><span class="ct-1ef187">import</span><span class="ct-fc252f"> { </span><span class="ct-56249b">getContract</span><span class="ct-fc252f"> } </span><span class="ct-1ef187">from</span><span class="ct-fc252f"> </span><span class="ct-9c9782">'.'</span><span class="ct-fc252f">;</span></span><span class="line"></span><span class="line"><span class="ct-295134">// ABI of contract</span></span><span class="line"><span class="ct-890deb">const</span><span class="ct-fc252f"> </span><span class="ct-9207a0">CONTRACT_ABI</span><span class="ct-fc252f"> </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> { </span><span class="ct-295134">/* ... */</span><span class="ct-fc252f"> };</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-295134">// address for contract</span></span><span class="line"><span class="ct-890deb">const</span><span class="ct-fc252f"> </span><span class="ct-9207a0">CONTRACT_ADDRESS</span><span class="ct-fc252f"> </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> </span><span class="ct-9c9782">'0xdea164f67df4dbfe675d5271c9d404e0260f33bb'</span><span class="ct-fc252f">;</span></span><span class="line"></span><span class="line"><span class="ct-1ef187">export</span><span class="ct-fc252f"> </span><span class="ct-890deb">const</span><span class="ct-fc252f"> </span><span class="ct-61346a">executeContractMethod</span><span class="ct-fc252f"> </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> </span><span class="ct-890deb">async</span><span class="ct-fc252f"> ({}) </span><span class="ct-890deb">=></span><span class="ct-fc252f"> {</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-295134">// getting contract</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-890deb">const</span><span class="ct-fc252f"> </span><span class="ct-9207a0">contract</span><span class="ct-fc252f"> </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> </span><span class="ct-61346a">getContract</span><span class="ct-fc252f">(</span><span class="ct-9207a0">CONTRACT_ABI</span><span class="ct-fc252f">, </span><span class="ct-9207a0">CONTRACT_ADDRESS</span><span class="ct-fc252f">);</span></span><span class="line"><span class="ct-fc252f"> </span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-295134">// Calling write method</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-1ef187">try</span><span class="ct-fc252f"> {</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-295134">// authorizing with Metamask</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-1ef187">await</span><span class="ct-fc252f"> </span><span class="ct-56249b">web3</span><span class="ct-fc252f">.</span><span class="ct-56249b">currentProvider</span><span class="ct-fc252f">.</span><span class="ct-61346a">request</span><span class="ct-fc252f">({ method: </span><span class="ct-9c9782">'eth_requestAccounts'</span><span class="ct-fc252f"> });</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-295134">// getting wallet address</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-890deb">const</span><span class="ct-fc252f"> </span><span class="ct-9207a0">addressUser</span><span class="ct-fc252f"> </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> </span><span class="ct-56249b">web3</span><span class="ct-fc252f">.</span><span class="ct-56249b">currentProvider</span><span class="ct-fc252f">.</span><span class="ct-56249b">selectedAddress</span><span class="ct-fc252f">;</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-295134">// calling "store" store method for contract</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-295134">// payload should include `from` address, that matches</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-295134">// current user's wallet</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-1ef187">await</span><span class="ct-fc252f"> </span><span class="ct-56249b">contract</span><span class="ct-fc252f">.</span><span class="ct-56249b">methods</span><span class="ct-fc252f">.</span><span class="ct-61346a">store</span><span class="ct-fc252f">(</span><span class="ct-2bb2d2">0</span><span class="ct-fc252f">, </span><span class="ct-9c9782">'Parameter'</span><span class="ct-fc252f">).</span><span class="ct-61346a">send</span><span class="ct-fc252f">({</span></span><span class="line"><span class="ct-fc252f"> from: </span><span class="ct-56249b">addressUser</span><span class="ct-fc252f">,</span></span><span class="line"><span class="ct-fc252f"> });</span></span><span class="line"><span class="ct-fc252f"> } </span><span class="ct-1ef187">catch</span><span class="ct-fc252f"> (</span><span class="ct-56249b">e</span><span class="ct-fc252f">) {</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-1ef187">throw</span><span class="ct-fc252f"> </span><span class="ct-1ef187">new</span><span class="ct-fc252f"> </span><span class="ct-c2ef3a">Error</span><span class="ct-fc252f">(</span><span class="ct-56249b">e</span><span class="ct-fc252f">);</span></span><span class="line"><span class="ct-fc252f"> }</span></span><span class="line"><span class="ct-fc252f"> </span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-295134">// calling read method</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-1ef187">try</span><span class="ct-fc252f"> {</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-295134">// this method can return data</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-890deb">const</span><span class="ct-fc252f"> </span><span class="ct-9207a0">result</span><span class="ct-fc252f"> </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> </span><span class="ct-1ef187">await</span><span class="ct-fc252f"> </span><span class="ct-56249b">contract</span><span class="ct-fc252f">.</span><span class="ct-56249b">methods</span><span class="ct-fc252f">.</span><span class="ct-61346a">retrieve</span><span class="ct-fc252f">().</span><span class="ct-61346a">call</span><span class="ct-fc252f">();</span></span><span class="line"><span class="ct-fc252f"> } </span><span class="ct-1ef187">catch</span><span class="ct-fc252f"> (</span><span class="ct-56249b">e</span><span class="ct-fc252f">) {</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-1ef187">throw</span><span class="ct-fc252f"> </span><span class="ct-1ef187">new</span><span class="ct-fc252f"> </span><span class="ct-c2ef3a">Error</span><span class="ct-fc252f">(</span><span class="ct-56249b">e</span><span class="ct-fc252f">);</span></span><span class="line"><span class="ct-fc252f"> }</span></span><span class="line"><span class="ct-fc252f">}</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-295134">// see example below</span></span><span class="line"><span class="ct-1ef187">import</span><span class="ct-fc252f"> { </span><span class="ct-56249b">getContract</span><span class="ct-fc252f"> } </span><span class="ct-1ef187">from</span><span class="ct-fc252f"> </span><span class="ct-9c9782">'.'</span><span class="ct-fc252f">;</span></span><span class="line"></span><span class="line"><span class="ct-295134">// ABI контракта</span></span><span class="line"><span class="ct-890deb">const</span><span class="ct-fc252f"> </span><span class="ct-9207a0">CONTRACT_ABI</span><span class="ct-fc252f"> </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> { </span><span class="ct-295134">/* ... */</span><span class="ct-fc252f"> };</span></span><span class="line"><span class="ct-295134">// contract address</span></span><span class="line"><span class="ct-890deb">const</span><span class="ct-fc252f"> </span><span class="ct-9207a0">CONTRACT_ADDRESS</span><span class="ct-fc252f"> </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> </span><span class="ct-9c9782">'0xdea164f67df4dbfe675d5271c9d404e0260f33bb'</span><span class="ct-fc252f">;</span></span><span class="line"><span class="ct-295134">// getting contract</span></span><span class="line"><span class="ct-890deb">const</span><span class="ct-fc252f"> </span><span class="ct-9207a0">contract</span><span class="ct-fc252f"> </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> </span><span class="ct-61346a">getContract</span><span class="ct-fc252f">(</span><span class="ct-9207a0">CONTRACT_ABI</span><span class="ct-fc252f">, </span><span class="ct-9207a0">CONTRACT_ADDRESS</span><span class="ct-fc252f">);</span></span><span class="line"><span class="ct-295134">// account's private key</span></span><span class="line"><span class="ct-890deb">const</span><span class="ct-fc252f"> </span><span class="ct-9207a0">privateKey</span><span class="ct-fc252f"> </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> </span><span class="ct-9c9782">'...'</span><span class="ct-fc252f">;</span></span><span class="line"></span><span class="line"><span class="ct-295134">// write-methods requires private key</span></span><span class="line"><span class="ct-2690b3">const</span><span class="ct-177e39"> </span><span class="ct-bbedd3">executeContractMethod</span><span class="ct-177e39"> </span><span class="ct-f3c518">=</span><span class="ct-177e39"> </span><span class="ct-2690b3">async</span><span class="ct-177e39"> (</span><span class="ct-bed189">val</span><span class="ct-f3c518">:</span><span class="ct-177e39"> </span><span class="ct-82c1f9">number</span><span class="ct-177e39">) </span><span class="ct-2690b3">=></span><span class="ct-177e39"> {</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-890deb">const</span><span class="ct-fc252f"> </span><span class="ct-9207a0">transaction</span><span class="ct-fc252f"> </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> </span><span class="ct-56249b">contract</span><span class="ct-fc252f">.</span><span class="ct-56249b">methods</span><span class="ct-fc252f">.</span><span class="ct-61346a">store</span><span class="ct-fc252f">(</span><span class="ct-56249b">val</span><span class="ct-fc252f">);</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-890deb">const</span><span class="ct-fc252f"> </span><span class="ct-9207a0">account</span><span class="ct-fc252f"> </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> </span><span class="ct-56249b">web3</span><span class="ct-fc252f">.</span><span class="ct-56249b">eth</span><span class="ct-fc252f">.</span><span class="ct-56249b">accounts</span><span class="ct-fc252f">.</span><span class="ct-61346a">privateKeyToAccount</span><span class="ct-fc252f">(</span><span class="ct-56249b">privateKey</span><span class="ct-fc252f">);</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-890deb">const</span><span class="ct-fc252f"> </span><span class="ct-9207a0">options</span><span class="ct-fc252f"> </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> {</span></span><span class="line"><span class="ct-fc252f"> to: </span><span class="ct-9207a0">CONTRACT_ADDRESS</span><span class="ct-fc252f">,</span></span><span class="line"><span class="ct-fc252f"> data: </span><span class="ct-56249b">transaction</span><span class="ct-fc252f">.</span><span class="ct-61346a">encodeABI</span><span class="ct-fc252f">(),</span></span><span class="line"><span class="ct-fc252f"> gas: </span><span class="ct-1ef187">await</span><span class="ct-fc252f"> </span><span class="ct-56249b">transaction</span><span class="ct-fc252f">.</span><span class="ct-61346a">estimateGas</span><span class="ct-fc252f">({ from: </span><span class="ct-56249b">account</span><span class="ct-fc252f">.</span><span class="ct-56249b">address</span><span class="ct-fc252f"> }),</span></span><span class="line"><span class="ct-fc252f"> gasPrice: </span><span class="ct-1ef187">await</span><span class="ct-fc252f"> </span><span class="ct-56249b">web3</span><span class="ct-fc252f">.</span><span class="ct-56249b">eth</span><span class="ct-fc252f">.</span><span class="ct-61346a">getGasPrice</span><span class="ct-fc252f">(),</span></span><span class="line"><span class="ct-fc252f"> };</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-890deb">const</span><span class="ct-fc252f"> </span><span class="ct-9207a0">signed</span><span class="ct-fc252f"> </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> </span><span class="ct-1ef187">await</span><span class="ct-fc252f"> </span><span class="ct-56249b">web3</span><span class="ct-fc252f">.</span><span class="ct-56249b">eth</span><span class="ct-fc252f">.</span><span class="ct-56249b">accounts</span><span class="ct-fc252f">.</span><span class="ct-61346a">signTransaction</span><span class="ct-fc252f">(</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-56249b">options</span><span class="ct-fc252f">,</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-56249b">privateKey</span><span class="ct-fc252f">,</span></span><span class="line"><span class="ct-fc252f"> );</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-1ef187">await</span><span class="ct-fc252f"> </span><span class="ct-56249b">web3</span><span class="ct-fc252f">.</span><span class="ct-56249b">eth</span><span class="ct-fc252f">.</span><span class="ct-61346a">sendSignedTransaction</span><span class="ct-fc252f">(</span><span class="ct-56249b">signed</span><span class="ct-fc252f">.</span><span class="ct-56249b">rawTransaction</span><span class="ct-1ef187">!</span><span class="ct-fc252f">);</span></span><span class="line"><span class="ct-fc252f">};</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-fc252f"> </span><span class="ct-890deb">const</span><span class="ct-fc252f"> </span><span class="ct-9207a0">requests</span><span class="ct-fc252f"> </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> [</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-56249b">contract</span><span class="ct-fc252f">.</span><span class="ct-56249b">method</span><span class="ct-fc252f">.</span><span class="ct-61346a">balanceOf</span><span class="ct-fc252f">().</span><span class="ct-56249b">call</span><span class="ct-fc252f">,</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-56249b">contract</span><span class="ct-fc252f">.</span><span class="ct-56249b">method</span><span class="ct-fc252f">.</span><span class="ct-61346a">getStaked</span><span class="ct-fc252f">().</span><span class="ct-56249b">call</span></span><span class="line"><span class="ct-fc252f"> ]</span></span><span class="line"></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-890deb">const</span><span class="ct-fc252f"> </span><span class="ct-9207a0">result</span><span class="ct-fc252f"> </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> </span><span class="ct-1ef187">await</span><span class="ct-fc252f"> </span><span class="ct-61346a">makeBatchRequest</span><span class="ct-fc252f">(</span><span class="ct-56249b">request</span><span class="ct-fc252f">);</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-890deb">const</span><span class="ct-fc252f"> </span><span class="ct-9207a0">web3</span><span class="ct-fc252f"> </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> </span><span class="ct-1ef187">new</span><span class="ct-fc252f"> </span><span class="ct-61346a">Web3</span><span class="ct-fc252f">(</span><span class="ct-56249b">Web3</span><span class="ct-fc252f">.</span><span class="ct-56249b">givenProvider</span><span class="ct-fc252f"> </span><span class="ct-1ef187">||</span><span class="ct-fc252f"> </span><span class="ct-9207a0">PROVIDER_URL</span><span class="ct-fc252f">);</span></span><span class="line"></span><span class="line"><span class="ct-2690b3">const</span><span class="ct-177e39"> </span><span class="ct-bbedd3">makeBatchRequest</span><span class="ct-177e39"> </span><span class="ct-f3c518">=</span><span class="ct-177e39"> (</span><span class="ct-bed189">calls</span><span class="ct-f3c518">:</span><span class="ct-177e39"> </span><span class="ct-82c1f9">any</span><span class="ct-177e39">[]) </span><span class="ct-2690b3">=></span><span class="ct-177e39"> {</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-1ef187">try</span><span class="ct-fc252f"> {</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-890deb">const</span><span class="ct-fc252f"> </span><span class="ct-9207a0">web3</span><span class="ct-fc252f"> </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> </span><span class="ct-61346a">getWeb3NoAccount</span><span class="ct-fc252f">();</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-890deb">const</span><span class="ct-fc252f"> </span><span class="ct-9207a0">batch</span><span class="ct-fc252f"> </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> </span><span class="ct-1ef187">new</span><span class="ct-fc252f"> </span><span class="ct-56249b">web3</span><span class="ct-fc252f">.</span><span class="ct-61346a">BatchRequest</span><span class="ct-fc252f">();</span></span><span class="line"></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-890deb">const</span><span class="ct-fc252f"> </span><span class="ct-9207a0">promises</span><span class="ct-fc252f"> </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> </span><span class="ct-56249b">calls</span><span class="ct-fc252f">.</span><span class="ct-61346a">map</span><span class="ct-890deb">=></span><span class="ct-fc252f"> {</span></span><span class="line"><span class="ct-177e39"> </span><span class="ct-f3c518">return</span><span class="ct-177e39"> </span><span class="ct-f3c518">new</span><span class="ct-177e39"> </span><span class="ct-82c1f9">Promise</span><span class="ct-177e39">((</span><span class="ct-bed189">resolve</span><span class="ct-177e39">, </span><span class="ct-bed189">reject</span><span class="ct-177e39">) </span><span class="ct-2690b3">=></span><span class="ct-177e39"> {</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-56249b">batch</span><span class="ct-fc252f">.</span><span class="ct-61346a">add</span><span class="ct-fc252f">(</span></span><span class="line"></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-1ef187">if</span><span class="ct-fc252f"> (</span><span class="ct-56249b">err</span><span class="ct-fc252f">) {</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-61346a">reject</span><span class="ct-fc252f">(</span><span class="ct-56249b">err</span><span class="ct-fc252f">);</span></span><span class="line"><span class="ct-fc252f"> } </span><span class="ct-1ef187">else</span><span class="ct-fc252f"> {</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-61346a">resolve</span><span class="ct-fc252f">(</span><span class="ct-56249b">result</span><span class="ct-fc252f">);</span></span><span class="line"><span class="ct-fc252f"> }</span></span><span class="line"><span class="ct-fc252f"> })</span></span><span class="line"><span class="ct-fc252f"> );</span></span><span class="line"><span class="ct-fc252f"> });</span></span><span class="line"><span class="ct-fc252f"> });</span></span><span class="line"></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-56249b">batch</span><span class="ct-fc252f">.</span><span class="ct-61346a">execute</span><span class="ct-fc252f">();</span></span><span class="line"></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-1ef187">return</span><span class="ct-fc252f"> </span><span class="ct-c2ef3a">Promise</span><span class="ct-fc252f">.</span><span class="ct-61346a">all</span><span class="ct-fc252f">(</span><span class="ct-56249b">promises</span><span class="ct-fc252f">);</span></span><span class="line"><span class="ct-fc252f"> } </span><span class="ct-1ef187">catch</span><span class="ct-fc252f"> {</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-1ef187">return</span><span class="ct-fc252f"> </span><span class="ct-391539">null</span><span class="ct-fc252f">;</span></span><span class="line"><span class="ct-fc252f"> }</span></span><span class="line"><span class="ct-fc252f">};</span></span><span class="line"></span><span class="line"><span class="ct-1ef187">export</span><span class="ct-2e08a5"> </span><span class="ct-1ef187">default</span><span class="ct-2e08a5"> </span><span class="ct-56249b">makeBatchRequest</span><span class="ct-fc252f">;</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-fc252f"> </span><span class="ct-1ef187">import</span><span class="ct-fc252f"> </span><span class="ct-56249b">Web3</span><span class="ct-fc252f"> </span><span class="ct-1ef187">from</span><span class="ct-fc252f"> </span><span class="ct-9c9782">'web3'</span><span class="ct-fc252f">;</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-890deb">const</span><span class="ct-fc252f"> </span><span class="ct-9207a0">web3</span><span class="ct-fc252f"> </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> </span><span class="ct-1ef187">new</span><span class="ct-fc252f"> </span><span class="ct-61346a">Web3</span><span class="ct-fc252f">(</span><span class="ct-9c9782">'YOUR_RPC_ENDPOINT_HERE'</span><span class="ct-fc252f">);</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-890deb">const</span><span class="ct-fc252f"> </span><span class="ct-9207a0">ABI</span><span class="ct-fc252f"> </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> </span><span class="ct-9c9782">'YOUR ABI HERE'</span><span class="ct-fc252f">;</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-890deb">const</span><span class="ct-fc252f"> </span><span class="ct-9207a0">CONTRACT_ADDRESS</span><span class="ct-fc252f"> </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> </span><span class="ct-9c9782">'YOUR CONTRACT ADDRESS HERE'</span><span class="ct-fc252f">;</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-890deb">const</span><span class="ct-fc252f"> </span><span class="ct-9207a0">myContract</span><span class="ct-fc252f"> </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> </span><span class="ct-1ef187">new</span><span class="ct-fc252f"> </span><span class="ct-56249b">Web3</span><span class="ct-fc252f">.</span><span class="ct-61346a">Contract</span><span class="ct-fc252f">(</span><span class="ct-9207a0">ABI</span><span class="ct-fc252f">, </span><span class="ct-9207a0">CONTRACT_ADDRESS</span><span class="ct-fc252f">);</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-56249b">referralProgramContract</span><span class="ct-fc252f">.</span><span class="ct-56249b">events</span></span><span class="line"><span class="ct-fc252f"> .</span><span class="ct-61346a">RegisterUser</span><span class="ct-fc252f">()</span></span><span class="line"><span class="ct-177e39"> .</span><span class="ct-bbedd3">on</span><span class="ct-177e39">(</span><span class="ct-5da781">'connected'</span><span class="ct-177e39">, (</span><span class="ct-bed189">subscriptionId</span><span class="ct-f3c518">:</span><span class="ct-177e39"> </span><span class="ct-82c1f9">string</span><span class="ct-177e39">) </span><span class="ct-2690b3">=></span><span class="ct-177e39"> {</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-56249b">console</span><span class="ct-fc252f">.</span><span class="ct-61346a">log</span><span class="ct-fc252f">(</span><span class="ct-9c9782">`| UserRegistered | events | ${</span><span class="ct-56249b">subscriptionId</span><span class="ct-9c9782">}`</span><span class="ct-fc252f">);</span></span><span class="line"><span class="ct-fc252f"> })</span></span><span class="line"><span class="ct-fc252f"> .</span><span class="ct-61346a">on</span><span class="ct-fc252f">(</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-9c9782">'data'</span><span class="ct-fc252f">,</span></span><span class="line"><span class="ct-177e39"> </span><span class="ct-2690b3">async</span><span class="ct-177e39"> (</span><span class="ct-bed189">event</span><span class="ct-f3c518">:</span><span class="ct-177e39"> {</span></span><span class="line"><span class="ct-177e39"> </span><span class="ct-bed189">removed</span><span class="ct-f3c518">:</span><span class="ct-177e39"> </span><span class="ct-82c1f9">boolean</span><span class="ct-177e39">;</span></span><span class="line"><span class="ct-177e39"> </span><span class="ct-bed189">returnValues</span><span class="ct-f3c518">:</span><span class="ct-177e39"> </span><span class="ct-41d808">RegisterUserResponseInterface</span><span class="ct-177e39">;</span></span><span class="line"><span class="ct-fc252f"> }) </span><span class="ct-890deb">=></span><span class="ct-fc252f"> {</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-1ef187">try</span><span class="ct-fc252f"> {</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-1ef187">if</span><span class="ct-fc252f"> (</span><span class="ct-56249b">event</span><span class="ct-fc252f">.</span><span class="ct-56249b">removed</span><span class="ct-fc252f">) {</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-1ef187">return</span><span class="ct-fc252f">;</span></span><span class="line"><span class="ct-fc252f"> }</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-890deb">const</span><span class="ct-fc252f"> { </span><span class="ct-9207a0">user</span><span class="ct-fc252f">, </span><span class="ct-9207a0">referrer</span><span class="ct-fc252f"> } </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> </span><span class="ct-56249b">event</span><span class="ct-fc252f">.</span><span class="ct-56249b">returnValues</span><span class="ct-fc252f">;</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-56249b">console</span><span class="ct-fc252f">.</span><span class="ct-61346a">log</span><span class="ct-fc252f">(</span><span class="ct-56249b">user</span><span class="ct-fc252f">, </span><span class="ct-56249b">referrer</span><span class="ct-fc252f">);</span></span><span class="line"><span class="ct-fc252f"> } </span><span class="ct-1ef187">catch</span><span class="ct-fc252f"> (</span><span class="ct-56249b">e</span><span class="ct-fc252f">) {</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-56249b">console</span><span class="ct-fc252f">.</span><span class="ct-61346a">log</span><span class="ct-fc252f">(</span><span class="ct-9c9782">`| ONCE | ${</span><span class="ct-56249b">e</span><span class="ct-9c9782">}`</span><span class="ct-fc252f">);</span></span><span class="line"><span class="ct-fc252f"> }</span></span><span class="line"><span class="ct-fc252f"> },</span></span><span class="line"><span class="ct-fc252f"> )</span></span><span class="line"><span class="ct-177e39"> .</span><span class="ct-bbedd3">on</span><span class="ct-177e39">(</span><span class="ct-5da781">'error'</span><span class="ct-177e39">, (</span><span class="ct-bed189">error</span><span class="ct-f3c518">:</span><span class="ct-177e39"> </span><span class="ct-41d808">ErrnoException</span><span class="ct-177e39">) </span><span class="ct-2690b3">=></span><span class="ct-177e39"> {</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-56249b">console</span><span class="ct-fc252f">.</span><span class="ct-61346a">log</span><span class="ct-fc252f">(</span><span class="ct-56249b">error</span><span class="ct-fc252f">);</span></span><span class="line"><span class="ct-fc252f"> });</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-fc252f"> </span><span class="ct-890deb">let</span><span class="ct-fc252f"> </span><span class="ct-56249b">options</span><span class="ct-fc252f"> </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> {</span></span><span class="line"><span class="ct-fc252f"> filter: {</span></span><span class="line"><span class="ct-fc252f"> value: [],</span></span><span class="line"><span class="ct-fc252f"> },</span></span><span class="line"><span class="ct-fc252f"> fromBlock: </span><span class="ct-2bb2d2">0</span></span><span class="line"><span class="ct-fc252f"> };</span></span><span class="line"></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-56249b">myContract</span><span class="ct-fc252f">.</span><span class="ct-56249b">events</span><span class="ct-fc252f">.</span><span class="ct-61346a">Transfer</span><span class="ct-fc252f">(</span><span class="ct-56249b">options</span><span class="ct-fc252f">)</span></span><span class="line"><span class="ct-fc252f"> .</span><span class="ct-61346a">on</span><span class="ct-fc252f">(</span><span class="ct-9c9782">'data'</span><span class="ct-fc252f"> </span><span class="ct-61346a">log</span><span class="ct-fc252f">(</span><span class="ct-56249b">event</span><span class="ct-fc252f">))</span></span><span class="line"><span class="ct-fc252f"> .</span><span class="ct-61346a">on</span><span class="ct-fc252f">(</span><span class="ct-9c9782">'changed'</span><span class="ct-fc252f"> </span><span class="ct-61346a">log</span><span class="ct-fc252f">(</span><span class="ct-56249b">changed</span><span class="ct-fc252f">))</span></span><span class="line"><span class="ct-fc252f"> .</span><span class="ct-61346a">on</span><span class="ct-fc252f">(</span><span class="ct-9c9782">'error'</span><span class="ct-fc252f"> </span></span><span class="line"><span class="ct-fc252f"> .</span><span class="ct-61346a">on</span><span class="ct-fc252f">(</span><span class="ct-9c9782">'connected'</span><span class="ct-fc252f"> </span><span class="ct-61346a">log</span><span class="ct-fc252f">(</span><span class="ct-56249b">str</span><span class="ct-fc252f">))</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-fc252f"> </span><span class="ct-890deb">let</span><span class="ct-fc252f"> </span><span class="ct-56249b">options</span><span class="ct-fc252f"> </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> {</span></span><span class="line"><span class="ct-fc252f"> fromBlock: </span><span class="ct-2bb2d2">0</span><span class="ct-fc252f">,</span></span><span class="line"><span class="ct-fc252f"> address: [</span><span class="ct-9c9782">'address-1'</span><span class="ct-fc252f">, </span><span class="ct-9c9782">'address-2'</span><span class="ct-fc252f">], </span><span class="ct-295134">//Only get events from specific addresses</span></span><span class="line"><span class="ct-fc252f"> topics: [] </span><span class="ct-295134">//What topics to subscribe to</span></span><span class="line"><span class="ct-fc252f"> };</span></span><span class="line"></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-890deb">let</span><span class="ct-fc252f"> </span><span class="ct-56249b">subscription</span><span class="ct-fc252f"> </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> (</span><span class="ct-9c9782">'logs'</span><span class="ct-fc252f">, </span><span class="ct-56249b">options</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-1ef187">if</span><span class="ct-fc252f"> (</span><span class="ct-1ef187">!</span><span class="ct-56249b">err</span><span class="ct-fc252f">)</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-56249b">console</span><span class="ct-fc252f">.</span><span class="ct-61346a">log</span><span class="ct-fc252f">(</span><span class="ct-56249b">event</span><span class="ct-fc252f">)</span></span><span class="line"><span class="ct-fc252f"> });</span></span><span class="line"></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-56249b">subscription</span><span class="ct-fc252f">.</span><span class="ct-61346a">on</span><span class="ct-fc252f">(</span><span class="ct-9c9782">'data'</span><span class="ct-890deb">=></span><span class="ct-fc252f"> </span><span class="ct-56249b">console</span><span class="ct-fc252f">.</span><span class="ct-61346a">log</span><span class="ct-fc252f">(</span><span class="ct-56249b">event</span><span class="ct-fc252f">))</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-56249b">subscription</span><span class="ct-fc252f">.</span><span class="ct-61346a">on</span><span class="ct-fc252f">(</span><span class="ct-9c9782">'changed'</span><span class="ct-890deb">=></span><span class="ct-fc252f"> </span><span class="ct-56249b">console</span><span class="ct-fc252f">.</span><span class="ct-61346a">log</span><span class="ct-fc252f">(</span><span class="ct-56249b">changed</span><span class="ct-fc252f">))</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-56249b">subscription</span><span class="ct-fc252f">.</span><span class="ct-61346a">on</span><span class="ct-fc252f">(</span><span class="ct-9c9782">'error'</span><span class="ct-890deb">=></span><span class="ct-fc252f"> { </span><span class="ct-1ef187">throw</span><span class="ct-fc252f"> </span><span class="ct-56249b">err</span><span class="ct-fc252f"> })</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-56249b">subscription</span><span class="ct-fc252f">.</span><span class="ct-61346a">on</span><span class="ct-fc252f">(</span><span class="ct-9c9782">'connected'</span><span class="ct-890deb">=></span><span class="ct-fc252f"> </span><span class="ct-56249b">console</span><span class="ct-fc252f">.</span><span class="ct-61346a">log</span><span class="ct-fc252f">(</span><span class="ct-56249b">nr</span><span class="ct-fc252f">))</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-fc252f"> </span><span class="ct-295134">//example options(optional)</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-890deb">let</span><span class="ct-fc252f"> </span><span class="ct-56249b">options</span><span class="ct-fc252f"> </span><span class="ct-1ef187">=</span><span class="ct-fc252f"> {</span></span><span class="line"><span class="ct-fc252f"> filter: {</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-295134">// only get events where transfer value was 1000 or 1337</span></span><span class="line"><span class="ct-fc252f"> value: [</span><span class="ct-9c9782">'1000'</span><span class="ct-fc252f">, </span><span class="ct-9c9782">'1337'</span><span class="ct-fc252f">] </span></span><span class="line"><span class="ct-fc252f"> },</span></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-295134">// number | "earliest" | "pending" | "latest"</span></span><span class="line"><span class="ct-fc252f"> fromBlock: </span><span class="ct-2bb2d2">0</span><span class="ct-fc252f">, </span></span><span class="line"><span class="ct-fc252f"> toBlock: </span><span class="ct-9c9782">'latest'</span></span><span class="line"><span class="ct-fc252f"> };</span></span><span class="line"></span><span class="line"><span class="ct-fc252f"> </span><span class="ct-56249b">myContract</span><span class="ct-fc252f">.</span><span class="ct-61346a">getPastEvents</span><span class="ct-fc252f">(</span><span class="ct-9c9782">'Transfer'</span><span class="ct-fc252f">, </span><span class="ct-56249b">options</span><span class="ct-fc252f">)</span></span><span class="line"><span class="ct-fc252f"> .</span><span class="ct-61346a">then</span><span class="ct-fc252f"> </span><span class="ct-61346a">log</span><span class="ct-fc252f">(</span><span class="ct-56249b">results</span><span class="ct-fc252f">))</span></span><span class="line"><span class="ct-fc252f"> .</span><span class="ct-61346a">catch</span><span class="ct-fc252f"> </span></span></code></pre><!--]--></div><style>.ct-41d808{color:#FFA657}.ct-5da781{color:#A5D6FF}.ct-391539{color:#79C0FF}.ct-c2ef3a{color:#79C0FF}.ct-2bb2d2{color:#79C0FF}.ct-9207a0{color:#79C0FF}.ct-890deb{color:#FF7B72}.ct-295134{color:#8B949E}.ct-2e08a5{color:#FFA657}.ct-61346a{color:#D2A8FF}.ct-c58381{color:#79C0FF}.ct-d007af{color:#79C0FF}.ct-82c1f9{color:#79C0FF}.ct-bed189{color:#FFA657}.ct-f3c518{color:#FF7B72}.ct-bbedd3{color:#D2A8FF}.ct-177e39{color:#C9D1D9}.ct-2690b3{color:#FF7B72}.ct-9c9782{color:#A5D6FF}.ct-56249b{color:#C9D1D9}.ct-fc252f{color:#C9D1D9}.ct-1ef187{color:#FF7B72}.light .ct-1ef187{color:#859900}.light .ct-fc252f{color:#657B83}.light .ct-56249b{color:#268BD2}.light .ct-9c9782{color:#2AA198}.light .ct-2690b3{color:#073642}.light .ct-177e39{color:#657B83}.light .ct-bbedd3{color:#268BD2}.light .ct-f3c518{color:#859900}.light .ct-bed189{color:#657B83}.light .ct-82c1f9{color:#859900}.light .ct-d007af{color:#268BD2}.light .ct-c58381{color:#657B83}.light .ct-61346a{color:#268BD2}.light .ct-2e08a5{color:#657B83}.light .ct-295134{color:#93A1A1}.light .ct-890deb{color:#073642}.light .ct-9207a0{color:#268BD2}.light .ct-2bb2d2{color:#D33682}.light .ct-c2ef3a{color:#859900}.light .ct-391539{color:#B58900}.light .ct-5da781{color:#2AA198}.light .ct-41d808{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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