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Listen to blocks
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Listen to balance change
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Read Storage
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Craft Extrinsic
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Transfer DOTs
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<p><a href="https://polkadot.js.org" target="_blank"><img src="https://img.shields.io/badge/polkadot-js-orange.svg?style=flat-square" alt="polkadotjs"></a> <img src="https://img.shields.io/badge/license-ISC-lightgrey.svg?style=flat-square" alt="isc"> <a href="https://github.com/Flet/semistandard" target="_blank"><img src="https://img.shields.io/badge/code%20style-semistandard-lightgrey.svg?style=flat-square" alt="style"></a> <a href="https://www.npmjs.com/package/@polkadot/api" target="_blank"><img src="https://img.shields.io/npm/v/@polkadot/api.svg?style=flat-square" alt="npm"></a> <a href="https://travis-ci.org/polkadot-js/api" target="_blank"><img src="https://img.shields.io/travis/polkadot-js/api.svg?style=flat-square" alt="travis"></a> <a href="https://codeclimate.com/github/polkadot-js/api/maintainability" target="_blank"><img src="https://img.shields.io/codeclimate/maintainability/polkadot-js/api.svg?style=flat-square" alt="maintainability"></a> <a href="https://coveralls.io/github/polkadot-js/api?branch=master" target="_blank"><img src="https://img.shields.io/coveralls/polkadot-js/api.svg?style=flat-square" alt="coverage"></a> <a href="https://david-dm.org/polkadot-js/api?path=package/rpc-core" target="_blank"><img src="https://david-dm.org/polkadot-js/api.svg?style=flat-square&path=package/rpc-core" alt="dependency"></a> <a href="https://david-dm.org/polkadot-js/api?path=package/rpc-core#info=devDependencies" target="_blank"><img src="https://david-dm.org/polkadot-js/api/dev-status.svg?style=flat-square&path=package/rpc-core" alt="devDependency"></a></p>
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<h1 id="polkadotapi">@polkadot/api</h1>
|
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<p>This library provides a clean wrapper around all the methods exposed by a Polkadot network client.</p>
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<h2 id="usage">Usage</h2>
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<p>Installation -</p>
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<pre><code>npm install --save @polkadot/rpc-core
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</code></pre><p>Initialisation -</p>
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<pre><code class="lang-js"><div class="sunlight-container sunlight-theme-gitbook"><div class="sunlight-code-container"><pre class="sunlight-highlight-javascript sunlight-highlighted"><span class="sunlight-javascript"><span class="sunlight-reservedWord">import</span> <span class="sunlight-ident">Api</span> <span class="sunlight-ident">from</span> <span class="sunlight-string">'@polkadot/rpc-core'</span><span class="sunlight-punctuation">;</span>
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<span class="sunlight-reservedWord">import</span> <span class="sunlight-ident">WsProvider</span> <span class="sunlight-ident">from</span> <span class="sunlight-string">'@polkadot/rpc-provider/ws'</span><span class="sunlight-punctuation">;</span>
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<span class="sunlight-reservedWord">const</span> <span class="sunlight-ident">provider</span> <span class="sunlight-operator">=</span> <span class="sunlight-keyword">new</span> <span class="sunlight-ident">WsProvider</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">'http://127.0.0.1:9944'</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
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<span class="sunlight-reservedWord">const</span> <span class="sunlight-ident">api</span> <span class="sunlight-operator">=</span> <span class="sunlight-keyword">new</span> <span class="sunlight-ident">Api</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">provider</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
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</span></pre></div></div></code></pre>
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<p>Making calls -</p>
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<pre><code class="lang-js"><div class="sunlight-container sunlight-theme-gitbook"><div class="sunlight-code-container"><pre class="sunlight-highlight-javascript sunlight-highlighted"><span class="sunlight-javascript"><span class="sunlight-ident">api</span><span class="sunlight-operator">.</span><span class="sunlight-ident">chain</span>
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  <span class="sunlight-operator">.</span><span class="sunlight-ident">getHeader</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">'0x1234567890'</span><span class="sunlight-punctuation">)</span>
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  <span class="sunlight-operator">.</span><span class="sunlight-ident">then</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">header</span><span class="sunlight-punctuation">)</span> <span class="sunlight-operator">=</span><span class="sunlight-operator">></span> <span class="sunlight-ident">console</span><span class="sunlight-operator">.</span><span class="sunlight-ident">log</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">header</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">)</span>
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  <span class="sunlight-operator">.</span><span class="sunlight-keyword">catch</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">error</span><span class="sunlight-punctuation">)</span> <span class="sunlight-operator">=</span><span class="sunlight-operator">></span> <span class="sunlight-ident">console</span><span class="sunlight-operator">.</span><span class="sunlight-ident">error</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">error</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
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</span></pre></div></div></code></pre>
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<p>Retrieving the best block (once-off) -</p>
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<pre><code class="lang-js"><div class="sunlight-container sunlight-theme-gitbook"><div class="sunlight-code-container"><pre class="sunlight-highlight-javascript sunlight-highlighted"><span class="sunlight-javascript"><span class="sunlight-ident">api</span><span class="sunlight-operator">.</span><span class="sunlight-ident">chain</span>
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  <span class="sunlight-operator">.</span><span class="sunlight-ident">getHead</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">)</span>
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  <span class="sunlight-operator">.</span><span class="sunlight-ident">then</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">headerHash</span><span class="sunlight-punctuation">)</span> <span class="sunlight-operator">=</span><span class="sunlight-operator">></span> <span class="sunlight-punctuation">{</span>
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    <span class="sunlight-keyword">return</span> <span class="sunlight-ident">api</span><span class="sunlight-operator">.</span><span class="sunlight-ident">chain</span><span class="sunlight-operator">.</span><span class="sunlight-ident">getHeader</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">headerHash</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
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  <span class="sunlight-punctuation">}</span><span class="sunlight-punctuation">)</span>
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  <span class="sunlight-operator">.</span><span class="sunlight-ident">then</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">header</span><span class="sunlight-punctuation">)</span> <span class="sunlight-operator">=</span><span class="sunlight-operator">></span> <span class="sunlight-punctuation">{</span>
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    <span class="sunlight-ident">console</span><span class="sunlight-operator">.</span><span class="sunlight-ident">log</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">`</span><span class="sunlight-ident">best</span> <span class="sunlight-punctuation">#</span><span class="sunlight-ident">$</span><span class="sunlight-punctuation">{</span><span class="sunlight-ident">header</span><span class="sunlight-operator">.</span><span class="sunlight-ident">number</span><span class="sunlight-operator">.</span><span class="sunlight-ident">toString</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">}</span><span class="sunlight-punctuation">`</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
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  <span class="sunlight-punctuation">}</span><span class="sunlight-punctuation">)</span>
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  <span class="sunlight-operator">.</span><span class="sunlight-keyword">catch</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">error</span><span class="sunlight-punctuation">)</span> <span class="sunlight-operator">=</span><span class="sunlight-operator">></span> <span class="sunlight-punctuation">{</span>
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    <span class="sunlight-ident">console</span><span class="sunlight-operator">.</span><span class="sunlight-ident">error</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">'error:'</span><span class="sunlight-punctuation">,</span> <span class="sunlight-ident">error</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
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  <span class="sunlight-punctuation">}</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
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</span></pre></div></div></code></pre>
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<p>Retrieving best header via subscription -</p>
|
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<pre><code class="lang-js"><div class="sunlight-container sunlight-theme-gitbook"><div class="sunlight-code-container"><pre class="sunlight-highlight-javascript sunlight-highlighted"><span class="sunlight-javascript"><span class="sunlight-ident">api</span><span class="sunlight-operator">.</span><span class="sunlight-ident">chain</span>
|
|
  <span class="sunlight-operator">.</span><span class="sunlight-ident">newHead</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">error</span><span class="sunlight-punctuation">,</span> <span class="sunlight-ident">header</span><span class="sunlight-punctuation">)</span> <span class="sunlight-operator">=</span><span class="sunlight-operator">></span> <span class="sunlight-punctuation">{</span>
|
|
    <span class="sunlight-keyword">if</span> <span class="sunlight-punctuation">(</span><span class="sunlight-ident">error</span><span class="sunlight-punctuation">)</span> <span class="sunlight-punctuation">{</span>
|
|
      <span class="sunlight-ident">console</span><span class="sunlight-operator">.</span><span class="sunlight-ident">error</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">'error:'</span><span class="sunlight-punctuation">,</span> <span class="sunlight-ident">error</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
|
|
    <span class="sunlight-punctuation">}</span>
|
|
|
|
    <span class="sunlight-ident">console</span><span class="sunlight-operator">.</span><span class="sunlight-ident">log</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">`</span><span class="sunlight-ident">best</span> <span class="sunlight-punctuation">#</span><span class="sunlight-ident">$</span><span class="sunlight-punctuation">{</span><span class="sunlight-ident">header</span><span class="sunlight-operator">.</span><span class="sunlight-ident">number</span><span class="sunlight-operator">.</span><span class="sunlight-ident">toString</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">}</span><span class="sunlight-punctuation">`</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
|
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  <span class="sunlight-punctuation">}</span><span class="sunlight-punctuation">)</span>
|
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  <span class="sunlight-operator">.</span><span class="sunlight-ident">then</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">subscriptionId</span><span class="sunlight-punctuation">)</span> <span class="sunlight-operator">=</span><span class="sunlight-operator">></span> <span class="sunlight-punctuation">{</span>
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    <span class="sunlight-comment">// id for the subscription, can unsubscribe via</span>
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    <span class="sunlight-comment">// api.chain.newHead.unsubscribe(subscriptionId)</span>
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  <span class="sunlight-punctuation">}</span><span class="sunlight-punctuation">)</span>
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  <span class="sunlight-operator">.</span><span class="sunlight-keyword">catch</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">error</span><span class="sunlight-punctuation">)</span> <span class="sunlight-operator">=</span><span class="sunlight-operator">></span> <span class="sunlight-punctuation">{</span>
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    <span class="sunlight-ident">console</span><span class="sunlight-operator">.</span><span class="sunlight-ident">error</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">'error subscribing:'</span><span class="sunlight-punctuation">,</span> <span class="sunlight-ident">error</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
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  <span class="sunlight-punctuation">}</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
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</span></pre></div></div></code></pre>
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