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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-9ebc9f">import</span><span class="ct-7126dc"> { </span><span class="ct-d4b3a6">Contract</span><span class="ct-7126dc"> } </span><span class="ct-9ebc9f">from</span><span class="ct-7126dc"> </span><span class="ct-3e231d">'web3-eth-contract'</span><span class="ct-7126dc">;</span></span><span class="line"><span class="ct-9ebc9f">import</span><span class="ct-7126dc"> { </span><span class="ct-d4b3a6">web3</span><span class="ct-7126dc"> } </span><span class="ct-9ebc9f">from</span><span class="ct-7126dc"> </span><span class="ct-3e231d">'.'</span><span class="ct-7126dc">;</span></span><span class="line"></span><span class="line"><span class="ct-64850b">const</span><span class="ct-5af2f2"> </span><span class="ct-02b8f8">getContract</span><span class="ct-5af2f2"> </span><span class="ct-f401f9">=</span><span class="ct-5af2f2"> (</span><span class="ct-f733c6">abi</span><span class="ct-f401f9">:</span><span class="ct-5af2f2"> </span><span class="ct-7c5b10">object</span><span class="ct-5af2f2">, </span><span class="ct-f733c6">address</span><span class="ct-f401f9">?:</span><span class="ct-5af2f2"> </span><span class="ct-7c5b10">string</span><span class="ct-5af2f2">)</span><span class="ct-f401f9">:</span><span class="ct-5af2f2"> </span><span class="ct-64850b">=></span><span class="ct-5af2f2"> {</span></span><span class="line"><span class="ct-5af2f2"> </span><span class="ct-64850b">const</span><span class="ct-5af2f2"> </span><span class="ct-a1fec8">abiFromJson</span><span class="ct-5af2f2"> </span><span class="ct-f401f9">=</span><span class="ct-5af2f2"> </span><span class="ct-e69ce8">JSON</span><span class="ct-5af2f2">.</span><span class="ct-a1fec8">parse</span><span class="ct-5af2f2">(</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-9ebc9f">return</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">new</span><span class="ct-7126dc"> </span><span class="ct-d4b3a6">web3</span><span class="ct-7126dc">.</span><span class="ct-d4b3a6">eth</span><span class="ct-7126dc">.</span><span class="ct-c0df31">Contract</span><span class="ct-7126dc">(</span><span class="ct-d4b3a6">abiFromJson</span><span class="ct-7126dc">, </span><span class="ct-d4b3a6">address</span><span class="ct-7126dc">);</span></span><span class="line"><span class="ct-7126dc">};</span></span><span class="line"></span><span class="line"><span class="ct-9ebc9f">export</span><span class="ct-0aeb5a"> </span><span class="ct-9ebc9f">default</span><span class="ct-0aeb5a"> </span><span class="ct-d4b3a6">getContract</span><span class="ct-7126dc">;</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-d0b814">// see example below</span></span><span class="line"><span class="ct-9ebc9f">import</span><span class="ct-7126dc"> { </span><span class="ct-d4b3a6">getContract</span><span class="ct-7126dc"> } </span><span class="ct-9ebc9f">from</span><span class="ct-7126dc"> </span><span class="ct-3e231d">'.'</span><span class="ct-7126dc">;</span></span><span class="line"></span><span class="line"><span class="ct-d0b814">// ABI of contract</span></span><span class="line"><span class="ct-3a2e37">const</span><span class="ct-7126dc"> </span><span class="ct-a3a0b2">CONTRACT_ABI</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> { </span><span class="ct-d0b814">/* ... */</span><span class="ct-7126dc"> };</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d0b814">// address for contract</span></span><span class="line"><span class="ct-3a2e37">const</span><span class="ct-7126dc"> </span><span class="ct-a3a0b2">CONTRACT_ADDRESS</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> </span><span class="ct-3e231d">'0xdea164f67df4dbfe675d5271c9d404e0260f33bb'</span><span class="ct-7126dc">;</span></span><span class="line"></span><span class="line"><span class="ct-9ebc9f">export</span><span class="ct-7126dc"> </span><span class="ct-3a2e37">const</span><span class="ct-7126dc"> </span><span class="ct-c0df31">executeContractMethod</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> </span><span class="ct-3a2e37">async</span><span class="ct-7126dc"> ({}) </span><span class="ct-3a2e37">=></span><span class="ct-7126dc"> {</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d0b814">// getting contract</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-3a2e37">const</span><span class="ct-7126dc"> </span><span class="ct-a3a0b2">contract</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> </span><span class="ct-c0df31">getContract</span><span class="ct-7126dc">(</span><span class="ct-a3a0b2">CONTRACT_ABI</span><span class="ct-7126dc">, </span><span class="ct-a3a0b2">CONTRACT_ADDRESS</span><span class="ct-7126dc">);</span></span><span class="line"><span class="ct-7126dc"> </span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d0b814">// Calling write method</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-9ebc9f">try</span><span class="ct-7126dc"> {</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d0b814">// authorizing with Metamask</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-9ebc9f">await</span><span class="ct-7126dc"> </span><span class="ct-d4b3a6">web3</span><span class="ct-7126dc">.</span><span class="ct-d4b3a6">currentProvider</span><span class="ct-7126dc">.</span><span class="ct-c0df31">request</span><span class="ct-7126dc">({ method: </span><span class="ct-3e231d">'eth_requestAccounts'</span><span class="ct-7126dc"> });</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d0b814">// getting wallet address</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-3a2e37">const</span><span class="ct-7126dc"> </span><span class="ct-a3a0b2">addressUser</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> </span><span class="ct-d4b3a6">web3</span><span class="ct-7126dc">.</span><span class="ct-d4b3a6">currentProvider</span><span class="ct-7126dc">.</span><span class="ct-d4b3a6">selectedAddress</span><span class="ct-7126dc">;</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d0b814">// calling "store" store method for contract</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d0b814">// payload should include `from` address, that matches</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d0b814">// current user's wallet</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-9ebc9f">await</span><span class="ct-7126dc"> </span><span class="ct-d4b3a6">contract</span><span class="ct-7126dc">.</span><span class="ct-d4b3a6">methods</span><span class="ct-7126dc">.</span><span class="ct-c0df31">store</span><span class="ct-7126dc">(</span><span class="ct-84d600">0</span><span class="ct-7126dc">, </span><span class="ct-3e231d">'Parameter'</span><span class="ct-7126dc">).</span><span class="ct-c0df31">send</span><span class="ct-7126dc">({</span></span><span class="line"><span class="ct-7126dc"> from: </span><span class="ct-d4b3a6">addressUser</span><span class="ct-7126dc">,</span></span><span class="line"><span class="ct-7126dc"> });</span></span><span class="line"><span class="ct-7126dc"> } </span><span class="ct-9ebc9f">catch</span><span class="ct-7126dc"> (</span><span class="ct-d4b3a6">e</span><span class="ct-7126dc">) {</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-9ebc9f">throw</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">new</span><span class="ct-7126dc"> </span><span class="ct-386b80">Error</span><span class="ct-7126dc">(</span><span class="ct-d4b3a6">e</span><span class="ct-7126dc">);</span></span><span class="line"><span class="ct-7126dc"> }</span></span><span class="line"><span class="ct-7126dc"> </span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d0b814">// calling read method</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-9ebc9f">try</span><span class="ct-7126dc"> {</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d0b814">// this method can return data</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-3a2e37">const</span><span class="ct-7126dc"> </span><span class="ct-a3a0b2">result</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">await</span><span class="ct-7126dc"> </span><span class="ct-d4b3a6">contract</span><span class="ct-7126dc">.</span><span class="ct-d4b3a6">methods</span><span class="ct-7126dc">.</span><span class="ct-c0df31">retrieve</span><span class="ct-7126dc">().</span><span class="ct-c0df31">call</span><span class="ct-7126dc">();</span></span><span class="line"><span class="ct-7126dc"> } </span><span class="ct-9ebc9f">catch</span><span class="ct-7126dc"> (</span><span class="ct-d4b3a6">e</span><span class="ct-7126dc">) {</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-9ebc9f">throw</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">new</span><span class="ct-7126dc"> </span><span class="ct-386b80">Error</span><span class="ct-7126dc">(</span><span class="ct-d4b3a6">e</span><span class="ct-7126dc">);</span></span><span class="line"><span class="ct-7126dc"> }</span></span><span class="line"><span class="ct-7126dc">}</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-d0b814">// see example below</span></span><span class="line"><span class="ct-9ebc9f">import</span><span class="ct-7126dc"> { </span><span class="ct-d4b3a6">getContract</span><span class="ct-7126dc"> } </span><span class="ct-9ebc9f">from</span><span class="ct-7126dc"> </span><span class="ct-3e231d">'.'</span><span class="ct-7126dc">;</span></span><span class="line"></span><span class="line"><span class="ct-d0b814">// ABI контракта</span></span><span class="line"><span class="ct-3a2e37">const</span><span class="ct-7126dc"> </span><span class="ct-a3a0b2">CONTRACT_ABI</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> { </span><span class="ct-d0b814">/* ... */</span><span class="ct-7126dc"> };</span></span><span class="line"><span class="ct-d0b814">// contract address</span></span><span class="line"><span class="ct-3a2e37">const</span><span class="ct-7126dc"> </span><span class="ct-a3a0b2">CONTRACT_ADDRESS</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> </span><span class="ct-3e231d">'0xdea164f67df4dbfe675d5271c9d404e0260f33bb'</span><span class="ct-7126dc">;</span></span><span class="line"><span class="ct-d0b814">// getting contract</span></span><span class="line"><span class="ct-3a2e37">const</span><span class="ct-7126dc"> </span><span class="ct-a3a0b2">contract</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> </span><span class="ct-c0df31">getContract</span><span class="ct-7126dc">(</span><span class="ct-a3a0b2">CONTRACT_ABI</span><span class="ct-7126dc">, </span><span class="ct-a3a0b2">CONTRACT_ADDRESS</span><span class="ct-7126dc">);</span></span><span class="line"><span class="ct-d0b814">// account's private key</span></span><span class="line"><span class="ct-3a2e37">const</span><span class="ct-7126dc"> </span><span class="ct-a3a0b2">privateKey</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> </span><span class="ct-3e231d">'...'</span><span class="ct-7126dc">;</span></span><span class="line"></span><span class="line"><span class="ct-d0b814">// write-methods requires private key</span></span><span class="line"><span class="ct-64850b">const</span><span class="ct-5af2f2"> </span><span class="ct-02b8f8">executeContractMethod</span><span class="ct-5af2f2"> </span><span class="ct-f401f9">=</span><span class="ct-5af2f2"> </span><span class="ct-64850b">async</span><span class="ct-5af2f2"> (</span><span class="ct-f733c6">val</span><span class="ct-f401f9">:</span><span class="ct-5af2f2"> </span><span class="ct-7c5b10">number</span><span class="ct-5af2f2">) </span><span class="ct-64850b">=></span><span class="ct-5af2f2"> {</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-3a2e37">const</span><span class="ct-7126dc"> </span><span class="ct-a3a0b2">transaction</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> </span><span class="ct-d4b3a6">contract</span><span class="ct-7126dc">.</span><span class="ct-d4b3a6">methods</span><span class="ct-7126dc">.</span><span class="ct-c0df31">store</span><span class="ct-7126dc">(</span><span class="ct-d4b3a6">val</span><span class="ct-7126dc">);</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-3a2e37">const</span><span class="ct-7126dc"> </span><span class="ct-a3a0b2">account</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> </span><span class="ct-d4b3a6">web3</span><span class="ct-7126dc">.</span><span class="ct-d4b3a6">eth</span><span class="ct-7126dc">.</span><span class="ct-d4b3a6">accounts</span><span class="ct-7126dc">.</span><span class="ct-c0df31">privateKeyToAccount</span><span class="ct-7126dc">(</span><span class="ct-d4b3a6">privateKey</span><span class="ct-7126dc">);</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-3a2e37">const</span><span class="ct-7126dc"> </span><span class="ct-a3a0b2">options</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> {</span></span><span class="line"><span class="ct-7126dc"> to: </span><span class="ct-a3a0b2">CONTRACT_ADDRESS</span><span class="ct-7126dc">,</span></span><span class="line"><span class="ct-7126dc"> data: </span><span class="ct-d4b3a6">transaction</span><span class="ct-7126dc">.</span><span class="ct-c0df31">encodeABI</span><span class="ct-7126dc">(),</span></span><span class="line"><span class="ct-7126dc"> gas: </span><span class="ct-9ebc9f">await</span><span class="ct-7126dc"> </span><span class="ct-d4b3a6">transaction</span><span class="ct-7126dc">.</span><span class="ct-c0df31">estimateGas</span><span class="ct-7126dc">({ from: </span><span class="ct-d4b3a6">account</span><span class="ct-7126dc">.</span><span class="ct-d4b3a6">address</span><span class="ct-7126dc"> }),</span></span><span class="line"><span class="ct-7126dc"> gasPrice: </span><span class="ct-9ebc9f">await</span><span class="ct-7126dc"> </span><span class="ct-d4b3a6">web3</span><span class="ct-7126dc">.</span><span class="ct-d4b3a6">eth</span><span class="ct-7126dc">.</span><span class="ct-c0df31">getGasPrice</span><span class="ct-7126dc">(),</span></span><span class="line"><span class="ct-7126dc"> };</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-3a2e37">const</span><span class="ct-7126dc"> </span><span class="ct-a3a0b2">signed</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">await</span><span class="ct-7126dc"> </span><span class="ct-d4b3a6">web3</span><span class="ct-7126dc">.</span><span class="ct-d4b3a6">eth</span><span class="ct-7126dc">.</span><span class="ct-d4b3a6">accounts</span><span class="ct-7126dc">.</span><span class="ct-c0df31">signTransaction</span><span class="ct-7126dc">(</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d4b3a6">options</span><span class="ct-7126dc">,</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d4b3a6">privateKey</span><span class="ct-7126dc">,</span></span><span class="line"><span class="ct-7126dc"> );</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-9ebc9f">await</span><span class="ct-7126dc"> </span><span class="ct-d4b3a6">web3</span><span class="ct-7126dc">.</span><span class="ct-d4b3a6">eth</span><span class="ct-7126dc">.</span><span class="ct-c0df31">sendSignedTransaction</span><span class="ct-7126dc">(</span><span class="ct-d4b3a6">signed</span><span class="ct-7126dc">.</span><span class="ct-d4b3a6">rawTransaction</span><span class="ct-9ebc9f">!</span><span class="ct-7126dc">);</span></span><span class="line"><span class="ct-7126dc">};</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-7126dc"> </span><span class="ct-3a2e37">const</span><span class="ct-7126dc"> </span><span class="ct-a3a0b2">requests</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> [</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d4b3a6">contract</span><span class="ct-7126dc">.</span><span class="ct-d4b3a6">method</span><span class="ct-7126dc">.</span><span class="ct-c0df31">balanceOf</span><span class="ct-7126dc">().</span><span class="ct-d4b3a6">call</span><span class="ct-7126dc">,</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d4b3a6">contract</span><span class="ct-7126dc">.</span><span class="ct-d4b3a6">method</span><span class="ct-7126dc">.</span><span class="ct-c0df31">getStaked</span><span class="ct-7126dc">().</span><span class="ct-d4b3a6">call</span></span><span class="line"><span class="ct-7126dc"> ]</span></span><span class="line"></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-3a2e37">const</span><span class="ct-7126dc"> </span><span class="ct-a3a0b2">result</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">await</span><span class="ct-7126dc"> </span><span class="ct-c0df31">makeBatchRequest</span><span class="ct-7126dc">(</span><span class="ct-d4b3a6">request</span><span class="ct-7126dc">);</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-3a2e37">const</span><span class="ct-7126dc"> </span><span class="ct-a3a0b2">web3</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">new</span><span class="ct-7126dc"> </span><span class="ct-c0df31">Web3</span><span class="ct-7126dc">(</span><span class="ct-d4b3a6">Web3</span><span class="ct-7126dc">.</span><span class="ct-d4b3a6">givenProvider</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">||</span><span class="ct-7126dc"> </span><span class="ct-a3a0b2">PROVIDER_URL</span><span class="ct-7126dc">);</span></span><span class="line"></span><span class="line"><span class="ct-64850b">const</span><span class="ct-5af2f2"> </span><span class="ct-02b8f8">makeBatchRequest</span><span class="ct-5af2f2"> </span><span class="ct-f401f9">=</span><span class="ct-5af2f2"> (</span><span class="ct-f733c6">calls</span><span class="ct-f401f9">:</span><span class="ct-5af2f2"> </span><span class="ct-7c5b10">any</span><span class="ct-5af2f2">[]) </span><span class="ct-64850b">=></span><span class="ct-5af2f2"> {</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-9ebc9f">try</span><span class="ct-7126dc"> {</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-3a2e37">const</span><span class="ct-7126dc"> </span><span class="ct-a3a0b2">web3</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> </span><span class="ct-c0df31">getWeb3NoAccount</span><span class="ct-7126dc">();</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-3a2e37">const</span><span class="ct-7126dc"> </span><span class="ct-a3a0b2">batch</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">new</span><span class="ct-7126dc"> </span><span class="ct-d4b3a6">web3</span><span class="ct-7126dc">.</span><span class="ct-c0df31">BatchRequest</span><span class="ct-7126dc">();</span></span><span class="line"></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-3a2e37">const</span><span class="ct-7126dc"> </span><span class="ct-a3a0b2">promises</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> </span><span class="ct-d4b3a6">calls</span><span class="ct-7126dc">.</span><span class="ct-c0df31">map</span><span class="ct-3a2e37">=></span><span class="ct-7126dc"> {</span></span><span class="line"><span class="ct-5af2f2"> </span><span class="ct-f401f9">return</span><span class="ct-5af2f2"> </span><span class="ct-f401f9">new</span><span class="ct-5af2f2"> </span><span class="ct-7c5b10">Promise</span><span class="ct-5af2f2">((</span><span class="ct-f733c6">resolve</span><span class="ct-5af2f2">, </span><span class="ct-f733c6">reject</span><span class="ct-5af2f2">) </span><span class="ct-64850b">=></span><span class="ct-5af2f2"> {</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d4b3a6">batch</span><span class="ct-7126dc">.</span><span class="ct-c0df31">add</span><span class="ct-7126dc">(</span></span><span class="line"></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-9ebc9f">if</span><span class="ct-7126dc"> (</span><span class="ct-d4b3a6">err</span><span class="ct-7126dc">) {</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-c0df31">reject</span><span class="ct-7126dc">(</span><span class="ct-d4b3a6">err</span><span class="ct-7126dc">);</span></span><span class="line"><span class="ct-7126dc"> } </span><span class="ct-9ebc9f">else</span><span class="ct-7126dc"> {</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-c0df31">resolve</span><span class="ct-7126dc">(</span><span class="ct-d4b3a6">result</span><span class="ct-7126dc">);</span></span><span class="line"><span class="ct-7126dc"> }</span></span><span class="line"><span class="ct-7126dc"> })</span></span><span class="line"><span class="ct-7126dc"> );</span></span><span class="line"><span class="ct-7126dc"> });</span></span><span class="line"><span class="ct-7126dc"> });</span></span><span class="line"></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d4b3a6">batch</span><span class="ct-7126dc">.</span><span class="ct-c0df31">execute</span><span class="ct-7126dc">();</span></span><span class="line"></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-9ebc9f">return</span><span class="ct-7126dc"> </span><span class="ct-386b80">Promise</span><span class="ct-7126dc">.</span><span class="ct-c0df31">all</span><span class="ct-7126dc">(</span><span class="ct-d4b3a6">promises</span><span class="ct-7126dc">);</span></span><span class="line"><span class="ct-7126dc"> } </span><span class="ct-9ebc9f">catch</span><span class="ct-7126dc"> {</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-9ebc9f">return</span><span class="ct-7126dc"> </span><span class="ct-5f36d3">null</span><span class="ct-7126dc">;</span></span><span class="line"><span class="ct-7126dc"> }</span></span><span class="line"><span class="ct-7126dc">};</span></span><span class="line"></span><span class="line"><span class="ct-9ebc9f">export</span><span class="ct-0aeb5a"> </span><span class="ct-9ebc9f">default</span><span class="ct-0aeb5a"> </span><span class="ct-d4b3a6">makeBatchRequest</span><span class="ct-7126dc">;</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-7126dc"> </span><span class="ct-9ebc9f">import</span><span class="ct-7126dc"> </span><span class="ct-d4b3a6">Web3</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">from</span><span class="ct-7126dc"> </span><span class="ct-3e231d">'web3'</span><span class="ct-7126dc">;</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-3a2e37">const</span><span class="ct-7126dc"> </span><span class="ct-a3a0b2">web3</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">new</span><span class="ct-7126dc"> </span><span class="ct-c0df31">Web3</span><span class="ct-7126dc">(</span><span class="ct-3e231d">'YOUR_RPC_ENDPOINT_HERE'</span><span class="ct-7126dc">);</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-3a2e37">const</span><span class="ct-7126dc"> </span><span class="ct-a3a0b2">ABI</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> </span><span class="ct-3e231d">'YOUR ABI HERE'</span><span class="ct-7126dc">;</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-3a2e37">const</span><span class="ct-7126dc"> </span><span class="ct-a3a0b2">CONTRACT_ADDRESS</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> </span><span class="ct-3e231d">'YOUR CONTRACT ADDRESS HERE'</span><span class="ct-7126dc">;</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-3a2e37">const</span><span class="ct-7126dc"> </span><span class="ct-a3a0b2">myContract</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">new</span><span class="ct-7126dc"> </span><span class="ct-d4b3a6">Web3</span><span class="ct-7126dc">.</span><span class="ct-c0df31">Contract</span><span class="ct-7126dc">(</span><span class="ct-a3a0b2">ABI</span><span class="ct-7126dc">, </span><span class="ct-a3a0b2">CONTRACT_ADDRESS</span><span class="ct-7126dc">);</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-d4b3a6">referralProgramContract</span><span class="ct-7126dc">.</span><span class="ct-d4b3a6">events</span></span><span class="line"><span class="ct-7126dc"> .</span><span class="ct-c0df31">RegisterUser</span><span class="ct-7126dc">()</span></span><span class="line"><span class="ct-5af2f2"> .</span><span class="ct-02b8f8">on</span><span class="ct-5af2f2">(</span><span class="ct-3ec8c6">'connected'</span><span class="ct-5af2f2">, (</span><span class="ct-f733c6">subscriptionId</span><span class="ct-f401f9">:</span><span class="ct-5af2f2"> </span><span class="ct-7c5b10">string</span><span class="ct-5af2f2">) </span><span class="ct-64850b">=></span><span class="ct-5af2f2"> {</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d4b3a6">console</span><span class="ct-7126dc">.</span><span class="ct-c0df31">log</span><span class="ct-7126dc">(</span><span class="ct-3e231d">`| UserRegistered | events | ${</span><span class="ct-d4b3a6">subscriptionId</span><span class="ct-3e231d">}`</span><span class="ct-7126dc">);</span></span><span class="line"><span class="ct-7126dc"> })</span></span><span class="line"><span class="ct-7126dc"> .</span><span class="ct-c0df31">on</span><span class="ct-7126dc">(</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-3e231d">'data'</span><span class="ct-7126dc">,</span></span><span class="line"><span class="ct-5af2f2"> </span><span class="ct-64850b">async</span><span class="ct-5af2f2"> (</span><span class="ct-f733c6">event</span><span class="ct-f401f9">:</span><span class="ct-5af2f2"> {</span></span><span class="line"><span class="ct-5af2f2"> </span><span class="ct-f733c6">removed</span><span class="ct-f401f9">:</span><span class="ct-5af2f2"> </span><span class="ct-7c5b10">boolean</span><span class="ct-5af2f2">;</span></span><span class="line"><span class="ct-5af2f2"> </span><span class="ct-f733c6">returnValues</span><span class="ct-f401f9">:</span><span class="ct-5af2f2"> </span><span class="ct-eb3fb7">RegisterUserResponseInterface</span><span class="ct-5af2f2">;</span></span><span class="line"><span class="ct-7126dc"> }) </span><span class="ct-3a2e37">=></span><span class="ct-7126dc"> {</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-9ebc9f">try</span><span class="ct-7126dc"> {</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-9ebc9f">if</span><span class="ct-7126dc"> (</span><span class="ct-d4b3a6">event</span><span class="ct-7126dc">.</span><span class="ct-d4b3a6">removed</span><span class="ct-7126dc">) {</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-9ebc9f">return</span><span class="ct-7126dc">;</span></span><span class="line"><span class="ct-7126dc"> }</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-3a2e37">const</span><span class="ct-7126dc"> { </span><span class="ct-a3a0b2">user</span><span class="ct-7126dc">, </span><span class="ct-a3a0b2">referrer</span><span class="ct-7126dc"> } </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> </span><span class="ct-d4b3a6">event</span><span class="ct-7126dc">.</span><span class="ct-d4b3a6">returnValues</span><span class="ct-7126dc">;</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d4b3a6">console</span><span class="ct-7126dc">.</span><span class="ct-c0df31">log</span><span class="ct-7126dc">(</span><span class="ct-d4b3a6">user</span><span class="ct-7126dc">, </span><span class="ct-d4b3a6">referrer</span><span class="ct-7126dc">);</span></span><span class="line"><span class="ct-7126dc"> } </span><span class="ct-9ebc9f">catch</span><span class="ct-7126dc"> (</span><span class="ct-d4b3a6">e</span><span class="ct-7126dc">) {</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d4b3a6">console</span><span class="ct-7126dc">.</span><span class="ct-c0df31">log</span><span class="ct-7126dc">(</span><span class="ct-3e231d">`| ONCE | ${</span><span class="ct-d4b3a6">e</span><span class="ct-3e231d">}`</span><span class="ct-7126dc">);</span></span><span class="line"><span class="ct-7126dc"> }</span></span><span class="line"><span class="ct-7126dc"> },</span></span><span class="line"><span class="ct-7126dc"> )</span></span><span class="line"><span class="ct-5af2f2"> .</span><span class="ct-02b8f8">on</span><span class="ct-5af2f2">(</span><span class="ct-3ec8c6">'error'</span><span class="ct-5af2f2">, (</span><span class="ct-f733c6">error</span><span class="ct-f401f9">:</span><span class="ct-5af2f2"> </span><span class="ct-eb3fb7">ErrnoException</span><span class="ct-5af2f2">) </span><span class="ct-64850b">=></span><span class="ct-5af2f2"> {</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d4b3a6">console</span><span class="ct-7126dc">.</span><span class="ct-c0df31">log</span><span class="ct-7126dc">(</span><span class="ct-d4b3a6">error</span><span class="ct-7126dc">);</span></span><span class="line"><span class="ct-7126dc"> });</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-7126dc"> </span><span class="ct-3a2e37">let</span><span class="ct-7126dc"> </span><span class="ct-d4b3a6">options</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> {</span></span><span class="line"><span class="ct-7126dc"> filter: {</span></span><span class="line"><span class="ct-7126dc"> value: [],</span></span><span class="line"><span class="ct-7126dc"> },</span></span><span class="line"><span class="ct-7126dc"> fromBlock: </span><span class="ct-84d600">0</span></span><span class="line"><span class="ct-7126dc"> };</span></span><span class="line"></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d4b3a6">myContract</span><span class="ct-7126dc">.</span><span class="ct-d4b3a6">events</span><span class="ct-7126dc">.</span><span class="ct-c0df31">Transfer</span><span class="ct-7126dc">(</span><span class="ct-d4b3a6">options</span><span class="ct-7126dc">)</span></span><span class="line"><span class="ct-7126dc"> .</span><span class="ct-c0df31">on</span><span class="ct-7126dc">(</span><span class="ct-3e231d">'data'</span><span class="ct-7126dc"> </span><span class="ct-c0df31">log</span><span class="ct-7126dc">(</span><span class="ct-d4b3a6">event</span><span class="ct-7126dc">))</span></span><span class="line"><span class="ct-7126dc"> .</span><span class="ct-c0df31">on</span><span class="ct-7126dc">(</span><span class="ct-3e231d">'changed'</span><span class="ct-7126dc"> </span><span class="ct-c0df31">log</span><span class="ct-7126dc">(</span><span class="ct-d4b3a6">changed</span><span class="ct-7126dc">))</span></span><span class="line"><span class="ct-7126dc"> .</span><span class="ct-c0df31">on</span><span class="ct-7126dc">(</span><span class="ct-3e231d">'error'</span><span class="ct-7126dc"> </span></span><span class="line"><span class="ct-7126dc"> .</span><span class="ct-c0df31">on</span><span class="ct-7126dc">(</span><span class="ct-3e231d">'connected'</span><span class="ct-7126dc"> </span><span class="ct-c0df31">log</span><span class="ct-7126dc">(</span><span class="ct-d4b3a6">str</span><span class="ct-7126dc">))</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-7126dc"> </span><span class="ct-3a2e37">let</span><span class="ct-7126dc"> </span><span class="ct-d4b3a6">options</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> {</span></span><span class="line"><span class="ct-7126dc"> fromBlock: </span><span class="ct-84d600">0</span><span class="ct-7126dc">,</span></span><span class="line"><span class="ct-7126dc"> address: [</span><span class="ct-3e231d">'address-1'</span><span class="ct-7126dc">, </span><span class="ct-3e231d">'address-2'</span><span class="ct-7126dc">], </span><span class="ct-d0b814">//Only get events from specific addresses</span></span><span class="line"><span class="ct-7126dc"> topics: [] </span><span class="ct-d0b814">//What topics to subscribe to</span></span><span class="line"><span class="ct-7126dc"> };</span></span><span class="line"></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-3a2e37">let</span><span class="ct-7126dc"> </span><span class="ct-d4b3a6">subscription</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> (</span><span class="ct-3e231d">'logs'</span><span class="ct-7126dc">, </span><span class="ct-d4b3a6">options</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-9ebc9f">if</span><span class="ct-7126dc"> (</span><span class="ct-9ebc9f">!</span><span class="ct-d4b3a6">err</span><span class="ct-7126dc">)</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d4b3a6">console</span><span class="ct-7126dc">.</span><span class="ct-c0df31">log</span><span class="ct-7126dc">(</span><span class="ct-d4b3a6">event</span><span class="ct-7126dc">)</span></span><span class="line"><span class="ct-7126dc"> });</span></span><span class="line"></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d4b3a6">subscription</span><span class="ct-7126dc">.</span><span class="ct-c0df31">on</span><span class="ct-7126dc">(</span><span class="ct-3e231d">'data'</span><span class="ct-3a2e37">=></span><span class="ct-7126dc"> </span><span class="ct-d4b3a6">console</span><span class="ct-7126dc">.</span><span class="ct-c0df31">log</span><span class="ct-7126dc">(</span><span class="ct-d4b3a6">event</span><span class="ct-7126dc">))</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d4b3a6">subscription</span><span class="ct-7126dc">.</span><span class="ct-c0df31">on</span><span class="ct-7126dc">(</span><span class="ct-3e231d">'changed'</span><span class="ct-3a2e37">=></span><span class="ct-7126dc"> </span><span class="ct-d4b3a6">console</span><span class="ct-7126dc">.</span><span class="ct-c0df31">log</span><span class="ct-7126dc">(</span><span class="ct-d4b3a6">changed</span><span class="ct-7126dc">))</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d4b3a6">subscription</span><span class="ct-7126dc">.</span><span class="ct-c0df31">on</span><span class="ct-7126dc">(</span><span class="ct-3e231d">'error'</span><span class="ct-3a2e37">=></span><span class="ct-7126dc"> { </span><span class="ct-9ebc9f">throw</span><span class="ct-7126dc"> </span><span class="ct-d4b3a6">err</span><span class="ct-7126dc"> })</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d4b3a6">subscription</span><span class="ct-7126dc">.</span><span class="ct-c0df31">on</span><span class="ct-7126dc">(</span><span class="ct-3e231d">'connected'</span><span class="ct-3a2e37">=></span><span class="ct-7126dc"> </span><span class="ct-d4b3a6">console</span><span class="ct-7126dc">.</span><span class="ct-c0df31">log</span><span class="ct-7126dc">(</span><span class="ct-d4b3a6">nr</span><span class="ct-7126dc">))</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-7126dc"> </span><span class="ct-d0b814">//example options(optional)</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-3a2e37">let</span><span class="ct-7126dc"> </span><span class="ct-d4b3a6">options</span><span class="ct-7126dc"> </span><span class="ct-9ebc9f">=</span><span class="ct-7126dc"> {</span></span><span class="line"><span class="ct-7126dc"> filter: {</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d0b814">// only get events where transfer value was 1000 or 1337</span></span><span class="line"><span class="ct-7126dc"> value: [</span><span class="ct-3e231d">'1000'</span><span class="ct-7126dc">, </span><span class="ct-3e231d">'1337'</span><span class="ct-7126dc">] </span></span><span class="line"><span class="ct-7126dc"> },</span></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d0b814">// number | "earliest" | "pending" | "latest"</span></span><span class="line"><span class="ct-7126dc"> fromBlock: </span><span class="ct-84d600">0</span><span class="ct-7126dc">, </span></span><span class="line"><span class="ct-7126dc"> toBlock: </span><span class="ct-3e231d">'latest'</span></span><span class="line"><span class="ct-7126dc"> };</span></span><span class="line"></span><span class="line"><span class="ct-7126dc"> </span><span class="ct-d4b3a6">myContract</span><span class="ct-7126dc">.</span><span class="ct-c0df31">getPastEvents</span><span class="ct-7126dc">(</span><span class="ct-3e231d">'Transfer'</span><span class="ct-7126dc">, </span><span class="ct-d4b3a6">options</span><span class="ct-7126dc">)</span></span><span class="line"><span class="ct-7126dc"> .</span><span class="ct-c0df31">then</span><span class="ct-7126dc"> </span><span class="ct-c0df31">log</span><span class="ct-7126dc">(</span><span class="ct-d4b3a6">results</span><span class="ct-7126dc">))</span></span><span class="line"><span class="ct-7126dc"> .</span><span class="ct-c0df31">catch</span><span class="ct-7126dc"> </span></span></code></pre><!--]--></div><style>.ct-eb3fb7{color:#FFA657}.ct-3ec8c6{color:#A5D6FF}.ct-5f36d3{color:#79C0FF}.ct-386b80{color:#79C0FF}.ct-84d600{color:#79C0FF}.ct-a3a0b2{color:#79C0FF}.ct-3a2e37{color:#FF7B72}.ct-d0b814{color:#8B949E}.ct-0aeb5a{color:#FFA657}.ct-c0df31{color:#D2A8FF}.ct-e69ce8{color:#79C0FF}.ct-a1fec8{color:#79C0FF}.ct-7c5b10{color:#79C0FF}.ct-f733c6{color:#FFA657}.ct-f401f9{color:#FF7B72}.ct-02b8f8{color:#D2A8FF}.ct-5af2f2{color:#C9D1D9}.ct-64850b{color:#FF7B72}.ct-3e231d{color:#A5D6FF}.ct-d4b3a6{color:#C9D1D9}.ct-7126dc{color:#C9D1D9}.ct-9ebc9f{color:#FF7B72}.light .ct-9ebc9f{color:#859900}.light .ct-7126dc{color:#657B83}.light .ct-d4b3a6{color:#268BD2}.light .ct-3e231d{color:#2AA198}.light .ct-64850b{color:#073642}.light .ct-5af2f2{color:#657B83}.light .ct-02b8f8{color:#268BD2}.light .ct-f401f9{color:#859900}.light .ct-f733c6{color:#657B83}.light .ct-7c5b10{color:#859900}.light .ct-a1fec8{color:#268BD2}.light .ct-e69ce8{color:#657B83}.light .ct-c0df31{color:#268BD2}.light .ct-0aeb5a{color:#657B83}.light .ct-d0b814{color:#93A1A1}.light .ct-3a2e37{color:#073642}.light .ct-a3a0b2{color:#268BD2}.light .ct-84d600{color:#D33682}.light .ct-386b80{color:#859900}.light .ct-5f36d3{color:#B58900}.light .ct-3ec8c6{color:#2AA198}.light .ct-eb3fb7{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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