> ## Knowledge Base Index > Fetch the complete knowledge base index at: https://help.quizell.com/sitemap.xml > Use this file to discover available pages before exploring further. > Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash). # Understanding AI Sales Agent Credits & Billing ## Introduction The Quizell AI Sales Agent runs on **credits** — a prepaid balance you spend on live conversations with visitors. The **Billing** page is where you check your balance, top up, and set up auto-recharge so your agent never goes offline. This guide explains how credits are charged, where to manage them, and how to keep your agent running smoothly. ## How credits are charged A few simple rules govern how credits are spent: * **Credits are spent per AI agent conversation.** Each live conversation draws from your balance. * **Longer conversations cost more.** The more back-and-forth a conversation involves, the higher the cost. * **Your plan affects the rate.** The higher your plan, the lower the credit cost per conversation — so heavier usage is more economical on a higher plan. * **Preview testing is free.** Chatting with your agent in the dashboard preview doesn't consume any credits, so you can test as much as you like before going live. ## Where to find your billing * In your Quizell dashboard, open the left sidebar * Click **AI Agent → Billing** ![](https://storage.crisp.chat/users/helpdesk/website/-/9/c/4/e/9c4e823823ced00/image_1q10dje.png =1000x657) ## Step-by-step guide ### 1. Check your credit balance At the top of the Billing page, the **Credit balance** card shows your **remaining balance** in dollars. Below it, the **Credits Usage** chart shows how your spending has trended over time — useful for spotting busy periods or sudden spikes. ### 2. Buy credits To top up your balance: * Click **Buy Credits** on the Credit balance card * Choose an amount and complete the purchase Your new balance is available right away. ### 3. Set up auto-recharge Auto-recharge keeps your agent running by topping up your balance automatically, so conversations never stop because you ran out of credits. * On the Credit balance card, click **Manage** * In the **Auto-recharge settings** window, toggle **Auto-recharge** on * Set **When credit balance reaches** — the threshold that triggers a top-up (e.g., $5) * Set **Bring credit balance back up to** — the amount to top up to (e.g., $20) * Click **Save** When your balance drops below your chosen threshold, Quizell automatically tops it back up to the target amount. ![](https://storage.crisp.chat/users/helpdesk/website/-/9/c/4/e/9c4e823823ced00/image_1qai545.png =1000x657) ## That's it! You now know how credits work and how to keep your agent funded. 🎉 ## Best practices * **Turn on auto-recharge.** It's the simplest way to make sure your agent never stops mid-conversation because the balance hit zero. * **Keep conversations efficient.** Since longer conversations cost more, tight **Instructions** and a thorough **FAQ** that resolve questions quickly also keep your costs down. * **Upgrade if you're at volume.** A higher plan lowers your cost per conversation — worth comparing if your agent is busy. * **Test in preview first.** Preview testing is free, so refine your agent there before live conversations start drawing on your balance. * **Watch the usage chart.** Check Credits Usage periodically so spikes don't surprise you. ## Important notes * **Credits are separate from preview testing**, which is always free. Only live conversations with real visitors consume credits. * Cost per conversation depends on **conversation length** and **your plan** (higher plan = lower cost per conversation). * If your balance reaches zero and auto-recharge is off, your agent may stop responding to visitors — enable auto-recharge or top up to avoid interruptions. ## Troubleshooting **My agent stopped responding to visitors** * Check your **credit balance** under AI Agent → Billing. If it's depleted, click **Buy Credits** to top up, and consider enabling **auto-recharge**. **My credit usage is higher than expected** * Longer conversations cost more. Review the **Credits Usage** chart, and tighten your Instructions and FAQ so the agent resolves questions efficiently. **Auto-recharge isn't topping up my balance** * Open **Manage → Auto-recharge settings** and confirm the toggle is on and both threshold values are set and saved. ## What's next? * [How the Quizell AI Sales Agent Works](https://help.quizell.com/en/article/how-the-quizell-ai-sales-agent-works-ceoavy/) * [How to Create Your First AI Sales Agent](https://help.quizell.com/en/article/how-to-create-your-first-ai-sales-agent-zgltjg/) * [How to Train Your AI Sales Agent](https://help.quizell.com/en/article/how-to-train-your-ai-sales-agent-1m69624/) * [How to Customize Your AI Sales Agent Design](https://help.quizell.com/en/article/how-to-customize-your-ai-sales-agent-design-1wczgur/) * [How to Test Your AI Sales Agent (Preview Mode)](https://help.quizell.com/en/article/how-to-test-your-ai-sales-agent-preview-mode-1rvaspb/) * [How to Add the Quizell AI Sales Agent to Your Website](https://help.quizell.com/en/article/how-to-add-the-quizell-ai-sales-agent-to-your-website-1prk0w6/) Keep your agent funded and efficient, and it'll keep selling and supporting around the clock.