> For the complete documentation index, see [llms.txt](https://docs.tensorx.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tensorx.ai/billing/billing.md). # Credit & Billing Everything you need to know about payments, credits, and billing on TensorX. *** ## How Billing Works TensorX uses a **prepaid credit system**. You add credits to your account and pay only for what you use based on token consumption. ``` Cost = (Input Tokens × Input Price) + (Output Tokens × Output Price) ``` {% hint style="info" %} **View Live Pricing**: [tensorx.ai/models](https://tensorx.ai/models) - Pricing displayed per 1M tokens. {% endhint %} *** ## Payment Methods We accept multiple payment options to make it easy for developers worldwide: | Method | Type | Supported | | --------------------- | ----------- | ------------------------ | | **Credit/Debit Card** | Traditional | ✅ Visa, Mastercard, Amex | *** ## Adding Credits To add credits to your account: 1. Log in to [app.tensorx.ai](https://app.tensorx.ai) 2. Navigate to your [dashboard](https://app.tensorx.ai/dashboard) 3. Click **Add Credits** 4. Choose your payment method and amount 5. Complete the payment Credits are added to your account instantly after successful payment. {% hint style="warning" %} **Rate limits:** Depositing credits does not change your rate limit tier. Tiers are based on your **total consumed spend** — the cumulative dollar value of tokens you have actually used — not your credit balance. See [Rate Limits](https://docs.tensorx.ai/api-reference/rate-limits) for tier details and how to request higher limits. {% endhint %} {% hint style="info" %} **VAT:** TensorX does not currently add VAT at checkout. No VAT is charged on top-ups today, including for EU billing addresses. VAT handling is in progress and this page will be updated when it changes. {% endhint %} *** ## Balance Management ### Minimum Balance Requirement {% hint style="warning" %} **Important:** When your balance falls below **$0.05**, your account and API keys will be automatically disabled to prevent negative balance. You must top up your account to re-enable access. {% endhint %} ### Low Balance Notifications You'll receive notifications when your balance is running low: * Email alerts sent automatically at a fixed low-balance threshold * Dashboard warnings when balance is low ### Re-enabling Your Account If your account has been disabled due to low balance: 1. Log in to [app.tensorx.ai](https://app.tensorx.ai) 2. Add credits to your account 3. Your API keys will be automatically re-enabled once your balance is above $0.05 *** ## Usage & Monitoring Track your credit usage and API activity in your [dashboard](https://app.tensorx.ai/dashboard): * 📊 **Usage History** - See all API requests and costs * 💰 **Credit Balance** - Check remaining credits * 📈 **Usage Trends** - Monitor your consumption over time * 🔑 **API Key Usage** - Track usage per API key *** ## Pricing Pricing is based on token usage. Each model has different rates for input and output tokens. {% hint style="success" %} **View Current Pricing**: [tensorx.ai/models](https://tensorx.ai/models) All pricing is displayed per 1M tokens. {% endhint %} ### How to Estimate Costs * **1 token ≈ 4 characters** of English text * **100 tokens ≈ 75 words** * A typical API request with a short prompt and response might use 500-2000 tokens ### Cost Optimization Tips 1. **Choose the right model** - Use smaller/faster models for simple tasks 2. **Set max\_tokens** - Limit output length when appropriate 3. **Use system prompts efficiently** - Keep them concise 4. **Cache responses** - Don't repeat identical queries 5. **Monitor usage** - Check your dashboard regularly *** ## Refund Policy {% hint style="info" %} **24-hour refund window.** If you need a refund, contact within 24 hours of your purchase. After 24 hours, all purchases are final and credits become non-refundable. {% endhint %} We recommend starting with a small amount to test the platform before making a larger purchase. *** ## FAQ ### Do credits expire? No, credits do not expire. Use them whenever you need. ### Can I get an invoice? Yes, every top-up generates an invoice you can download yourself: 1. Sign in to the [dashboard](https://app.tensorx.ai). 2. Open **Billing** from the sidebar. 3. In the **Recent Transactions** list, click the **Invoice** button next to the deposit you want. The invoice opens in a new tab with a **Download PDF** option. ### What happens when I run out of credits? When your balance falls below $0.05, your account and API keys will be disabled. API requests will return authentication errors. Add credits to re-enable your account. ### Is there a minimum purchase? Check [tensorx.ai](https://tensorx.ai) for current minimum purchase amounts. ### Can I set up auto top-up? Yes. Auto top-up is self-serve from your [dashboard](https://app.tensorx.ai/dashboard). You set two values: 1. A **trigger balance** — when your credit balance falls to this amount, a top-up is made automatically. 2. A **refill amount** — the amount of credit added each time the trigger is reached. No support request is needed to switch it on or off. *** ## Need Help? * 📧 **Email**: * 💬 **Contact Support**: [Contact page](/support/support.md) --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.tensorx.ai/billing/billing.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.