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ethers.js/docs/v5/api/providers/api-providers/index.html
Richard Moore 209f3a88e6
Updated docs and added redirects.
2020-06-12 03:38:55 -04:00

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<div class="breadcrumbs"><a href="/v5/">Documentation</a>&nbsp;&nbsp;&raquo;&nbsp;&nbsp;<a href="/v5/api/">API</a>&nbsp;&nbsp;&raquo;&nbsp;&nbsp;<a href="/v5/api/providers/">Providers</a>&nbsp;&nbsp;&raquo;&nbsp;&nbsp;<span class="current">API Providers</span></div>
<a name="api-providers"></a><a name="api-providers"></a><h1 class="show-anchors"><div>API Providers<div class="anchors"><a class="self" href="/v5/api/providers/api-providers/#api-providers"></a></div></div></h1><p>There are many services which offer a web API for accessing the Ethereum Blockchain. These Providers allow connecting to them, which simplifies development, since you do not need to run your own instance or cluster of Ethereum nodes.</p>
<p>However, this reliance on third-party services can reduce resiliance, security and increase the amount of required trust. To mitigate these issues, it is recommended you use a <a href="/v5/api/providers/#providers-getDefaultProvider">Default Provider</a>.</p>
<a name="EtherscanProvider"></a><a name="api-providers--EtherscanProvider"></a><h2 class="show-anchors"><div>EtherscanProvider<span class="inherits"> inherits <a href="/v5/api/providers/provider/">Provider</a></span><div class="anchors"><a class="self" href="/v5/api/providers/api-providers/#EtherscanProvider"></a><a class="source" href="https://github.com/ethers-io/ethers.js/blob/ethers-v5-beta/packages/providers/src.ts/etherscan-provider.ts#L76">source</a></div></div></h2><p>The <b>EtherscanProvider</b> is backed by a combination of the various <a href="https://etherscan.io/apis">Etherscan APIs</a>.</p>
<div class="property show-anchors"><div class="signature"><span class="modifier">new </span><span class="path">ethers</span><span class="symbol">.</span><span class="path">providers</span><span class="symbol">.</span><span class="method">EtherscanProvider</span><span class="symbol">(</span> <span class="symbol">[</span> <span class="param">network</span> = "<span class="param">homestead</span>" <span class="symbol">,</span> <span class="symbol">[</span> <span class="param">apiKey</span> <span class="symbol">]</span> <span class="symbol">]</span> <span class="symbol">)</span><div class="anchors"></div></div><div class="body"><p>Create a new <b>EtherscanProvider</b> connected to <i>network</i> with the optional <i>apiKey</i>.</p>
<p>The <i>network</i> may be specified as <b>string</b> for a common network name, a <b>number</b> for a common chain ID or a [Network Object]provider-(network).</p>
<p>If no <i>apiKey</i> is provided, a shared API key will be used, which may result in reduced performance and throttled requests. It is highly recommended for production, you register with <a href="https://etherscan.io">Etherscan</a> for your own API key.</p>
</div></div><div class="definition container-box note"><div class="term">Note: Default API keys</div><div class="body"><p>If no <i>apiKey</i> is provided, a shared API key will be used, which may result in reduced performance and throttled requests.</p>
<p>It is highly recommended for production, you register with <a href="https://etherscan.io">Etherscan</a> for your own API key.</p>
</div></div><div class="definition"><div class="term"><b>Supported Networks</b></div><div class="body"><p><ul><li>Homestead (Mainnet) </li><li>Ropsten (proof-of-work testnet) </li><li>Rinkeby (proof-of-authority testnet) </li><li>G&ouml;rli (clique testnet) </li><li>Kovan (proof-of-authority testnet) </li></ul></p>
</div></div><div class="code-title"><div>Etherscan Examples</div></div><div class="code">// &lt;hide&gt;
const EtherscanProvider = ethers.providers.EtherscanProvider;
const apiKey = "...";
// &lt;/hide&gt;
// Connect to mainnet (homestead)
provider = new EtherscanProvider();
// Connect to rinkeby testnet (these are equivalent)
provider = new EtherscanProvider("rinkeby");
provider = new EtherscanProvider(4);
const network = ethers.providers.getNetwork("rinkeby");
// &lt;hide&gt;
delete network._defaultProvider;
network
// &lt;/hide&gt;
//!
provider = new EtherscanProvider(network);
// Connect to mainnet (homestead) with an API key
provider = new EtherscanProvider(null, apiKey);
provider = new EtherscanProvider("homestead", apiKey);</div><div class="property show-anchors"><div class="signature"><span class="path">provider</span><span class="symbol">.</span><span class="method">getHistory</span><span class="symbol">(</span> <span class="param">address</span> <span class="symbol">)</span> <span class="arrow">&rArr;</span> <span class="returns">Array&lt; History &gt;</span><div class="anchors"><a class="source" href="https://github.com/ethers-io/ethers.js/blob/ethers-v5-beta/packages/providers/src.ts/etherscan-provider.ts#L306">source</a></div></div><div class="body"><p>@TODO... Explain</p>
</div></div><a name="InfuraProvider"></a><a name="api-providers--InfuraProvider"></a><h2 class="show-anchors"><div>InfuraProvider<span class="inherits"> inherits <a href="/v5/api/providers/other/#UrlJsonRpcProvider">UrlJsonRpcProvider</a></span><div class="anchors"><a class="self" href="/v5/api/providers/api-providers/#InfuraProvider"></a><a class="source" href="https://github.com/ethers-io/ethers.js/blob/ethers-v5-beta/packages/providers/src.ts/infura-provider.ts#L17">source</a></div></div></h2><p>The <b>InfuraProvider</b> is backed by the popular <a href="https://infura.io">INFURA</a> Ethereum service.</p>
<div class="property show-anchors"><div class="signature"><span class="modifier">new </span><span class="path">ethers</span><span class="symbol">.</span><span class="path">providers</span><span class="symbol">.</span><span class="method">InfuraProvider</span><span class="symbol">(</span> <span class="symbol">[</span> <span class="param">network</span> = "<span class="param">homestead</span>" <span class="symbol">,</span> <span class="symbol">[</span> <span class="param">apiKey</span> <span class="symbol">]</span> <span class="symbol">]</span> <span class="symbol">)</span><div class="anchors"></div></div><div class="body"><p>Create a new <b>InfuraProvider</b> connected to <i>network</i> with the optional <i>apiKey</i>.</p>
<p>The <i>network</i> may be specified as <b>string</b> for a common network name, a <b>number</b> for a common chain ID or a [Network Object]provider-(network).</p>
<p>The <i>apiKey</i> can be a <b>string</b> Project ID or an <b>object</b> with the properties <code class="inline">projectId</code> and <code class="inline">projectSecret</code> to specify a <a href="https://infura.io/docs/gettingStarted/authentication">Project Secret</a> which can be used on non-public sources (like on a server) to further secure your API access and quotas.</p>
</div></div><div class="definition container-box note"><div class="term">Note: Default API keys</div><div class="body"><p>If no <i>apiKey</i> is provided, a shared API key will be used, which may result in reduced performance and throttled requests.</p>
<p>It is highly recommended for production, you register with <a href="https://infura.io">INFURA</a> for your own API key.</p>
</div></div><div class="definition"><div class="term"><b>Supported Networks</b></div><div class="body"><p><ul><li>Homestead (Mainnet) </li><li>Ropsten (proof-of-work testnet) </li><li>Rinkeby (proof-of-authority testnet) </li><li>G&ouml;rli (clique testnet) </li><li>Kovan (proof-of-authority testnet) </li></ul></p>
</div></div><div class="code-title"><div>INFURA Examples</div></div><div class="code">// &lt;hide&gt;
const InfuraProvider = ethers.providers.InfuraProvider;
const projectId = "...";
const projectSecret = "...";
// &lt;/hide&gt;
// Connect to mainnet (homestead)
provider = new InfuraProvider();
// Connect to the ropsten testnet
// (see EtherscanProvider above for other network examples)
provider = new InfuraProvider("ropsten");
// Connect to mainnet with a Project ID (these are equivalent)
provider = new InfuraProvider(null, projectId);
provider = new InfuraProvider("homestead", projectId);
// Connect to mainnet with a Project ID and Project Secret
provider = new InfuraProvider("homestead", {
projectId: projectId,
projectSecret: projectSecret
});</div><a name="AlchemyProvider"></a><a name="api-providers--AlchemyProvider"></a><h2 class="show-anchors"><div>AlchemyProvider<span class="inherits"> inherits <a href="/v5/api/providers/other/#UrlJsonRpcProvider">UrlJsonRpcProvider</a></span><div class="anchors"><a class="self" href="/v5/api/providers/api-providers/#AlchemyProvider"></a><a class="source" href="https://github.com/ethers-io/ethers.js/blob/ethers-v5-beta/packages/providers/src.ts/alchemy-provider.ts#L18">source</a></div></div></h2><p>The <b>AlchemyProvider</b> is backed by <a href="https://alchemyapi.io">Alchemy</a>.</p>
<div class="property show-anchors"><div class="signature"><span class="modifier">new </span><span class="path">ethers</span><span class="symbol">.</span><span class="path">providers</span><span class="symbol">.</span><span class="method">AlchemyProvider</span><span class="symbol">(</span> <span class="symbol">[</span> <span class="param">network</span> = "<span class="param">homestead</span>" <span class="symbol">,</span> <span class="symbol">[</span> <span class="param">apiKey</span> <span class="symbol">]</span> <span class="symbol">]</span> <span class="symbol">)</span><div class="anchors"></div></div><div class="body"><p>Create a new <b>AlchemyProvider</b> connected to <i>network</i> with the optional <i>apiKey</i>.</p>
<p>The <i>network</i> may be specified as <b>string</b> for a common network name, a <b>number</b> for a common chain ID or a <a href="/v5/api/providers/types/#providers-Network">Network Object</a>.</p>
</div></div><div class="definition container-box note"><div class="term">Note: Default API keys</div><div class="body"><p>If no <i>apiKey</i> is provided, a shared API key will be used, which may result in reduced performance and throttled requests.</p>
<p>It is highly recommended for production, you register with <a href="https://alchemyapi.io">Alchemy</a> for your own API key.</p>
</div></div><div class="definition"><div class="term"><b>Supported Networks</b></div><div class="body"><p><ul><li>Homestead (Mainnet) </li><li>Ropsten (proof-of-work testnet) </li><li>Rinkeby (proof-of-authority testnet) </li><li>G&ouml;rli (clique testnet) </li><li>Kovan (proof-of-authority testnet) </li></ul></p>
</div></div><div class="code-title"><div>Alchemy Examples</div></div><div class="code">// &lt;hide&gt;
const AlchemyProvider = ethers.providers.AlchemyProvider;
const apiKey = "...";
// &lt;/hide&gt;
// Connect to mainnet (homestead)
provider = new AlchemyProvider();
// Connect to the ropsten testnet
// (see EtherscanProvider above for other network examples)
provider = new AlchemyProvider("ropsten");
// Connect to mainnet with an API key (these are equivalent)
provider = new AlchemyProvider(null, apiKey);
provider = new AlchemyProvider("homestead", apiKey);</div><a name="CloudflareProvider"></a><a name="api-providers--CloudflareProvider"></a><h2 class="show-anchors"><div>CloudflareProvider<span class="inherits"> inherits <a href="/v5/api/providers/other/#UrlJsonRpcProvider">UrlJsonRpcProvider</a></span><div class="anchors"><a class="self" href="/v5/api/providers/api-providers/#CloudflareProvider"></a><a class="source" href="https://github.com/ethers-io/ethers.js/blob/ethers-v5-beta/packages/providers/src.ts/cloudflare-provider.ts#L10">source</a></div></div></h2><p>The CloudflareProvider is backed by the <a href="https://developers.cloudflare.com/distributed-web/ethereum-gateway/">Cloudflare Ethereum Gateway</a>.</p>
<div class="property show-anchors"><div class="signature"><span class="modifier">new </span><span class="path">ethers</span><span class="symbol">.</span><span class="path">providers</span><span class="symbol">.</span><span class="method">CloudflareProvider</span><span class="symbol">(</span> <span class="symbol">)</span><div class="anchors"></div></div><div class="body"><p>Create a new <b>CloudflareProvider</b> connected to mainnet (i.e. "homestead").</p>
</div></div><div class="definition"><div class="term"><b>Supported Networks</b></div><div class="body"><p><ul><li>Homestead (Mainnet) </li></ul></p>
</div></div><div class="code-title"><div>Cloudflare Examples</div></div><div class="code">// &lt;hide&gt;
const CloudflareProvider = ethers.providers.CloudflareProvider;
// &lt;/hide&gt;
// Connect to mainnet (homestead)
provider = new CloudflareProvider();</div>
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