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<li><a class="docs-link" href="/docs/introduction/configuring-difficulty-factor/">Configuring Difficulty Factor</a></li>
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<li><a class="docs-link" href="/docs/terminology/access-token/">Access token</a></li>
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<li><a class="docs-link" href="/docs/terminology/cooldown-period/">Cooldown Period</a></li>
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<li><a class="docs-link" href="/docs/terminology/difficulty-factor/">Difficulty Factor</a></li>
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<li><a class="docs-link" href="/docs/terminology/sitekey/">Site key</a></li>
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<li><a class="docs-link active" href="/docs/terminology/visitor-threshold/">Visitor Threshold</a></li>
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<h1>Visitor Threshold</h1>
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<p class="lead"></p>
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<p>mCaptcha’s variable difficulty factor mechanism requires a website’s traffic
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statistics be split into levels, so that it can deploy the right
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difficulty factor for each level.</p>
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<p>Visitor threshold is used to traffic into levels and mCaptcha accepts a
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difficulty configuration for each of these levels. When current traffic
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exceeds a difficulty factor, mCaptcha will increase the difficulty
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factor to the next configured level.</p>
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<p>For instance, consider the configuration given below:</p>
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<ul>
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<li>Cool down period: 30 seconds</li>
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</ul>
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<table>
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<thead>
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<tr>
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<th>Level</th>
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<th>Difficulty Factor</th>
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<th>Visitor Threshold</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>1</td>
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<td>5,000</td>
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<td>2,000</td>
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</tr>
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<tr>
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<td>2</td>
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<td>50,000</td>
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<td>5,000</td>
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</tr>
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<tr>
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<td>3</td>
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<td>500,000</td>
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<td>10,000</td>
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</tr>
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<tr>
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<td>4</td>
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<td>5,000,000</td>
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<td>15,000</td>
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</tr>
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</tbody>
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</table>
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<p>If the website sees 2,000 requests in a 30 second window, level 1
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difficulty factor(5,000) will be deployed. If the traffic increases to
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5,000 requests in a 30 second window, then difficulty factor will be
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upgraded to level 2(50,000). Likewise 10,000 and 15,000 requests over 30
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seconds will result in difficulty factor being upgraded to 500,000 and
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5,000,000 respectively.</p>
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<p>Visitor threshold is how mCaptcha determines which difficulty factor
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level to deploy. mCaptcha uses leaky bucket algorithm to keep the
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visitor threshold constantly updated within the configured cool down
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period. So, at any given moment the, the current visitor level will be
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the amount of traffic that was served in the cool down period specified.</p>
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<p class="edit-page"><a href="https://github.com/mCaptcha/website/blob/master/content/docs/terminology/visitor-threshold.md"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-edit-2"><path d="M17 3a2.828 2.828 0 1 1 4 4L7.5 20.5 2 22l1.5-5.5L17 3z"></path></svg>Edit this page on GitHub</a></p>
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