> ## Documentation Index > Fetch the complete documentation index at: https://apidoc.cometapi.com/llms.txt > Use this file to discover all available pages before exploring further. # Help Center > CometAPI Help Center for rate multipliers, pricing updates, concurrency limits, maintenance windows, error handling, and privacy logging policies. # Welcome to CometAPI Access 500+ models using the standard OpenAI interface protocol, with pay-as-you-go billing, transparent details, no hidden costs, and immediate access to all models after recharge. *** # About rate multipliers * **Definition**: Rate multipliers (group multipliers, model multipliers, completion multipliers) are a calculation method in the system. Each model has its independent multiplier, which doesn't directly reflect multiples of official prices. * **Principle**: Theoretically, our multiplier settings are designed to maintain complete consistency with official model pricing. * **Learn More**: Visit [Multiplier Calculation Method](https://www.cometapi.com/console/log). *** # About price adjustments * **GPT Models**: Usually synchronized with official multipliers, unless otherwise stated. * **Other Vendor Models**: Multiplier prices will be adjusted according to market conditions. * Each price adjustment will be publicly announced. For details, follow [Price Adjustment Announcements](https://www.cometapi.com/console/panel). * You can subscribe to multiplier change notifications via email on the [Subscription Page](https://www.cometapi.com/console/profile). *** # About concurrency * **Line descriptions**: * The platform uses large-scale cluster load balancing, supporting high concurrency by default. * For high-concurrency needs or specific model training requirements, use the **training** line and contact customer service to activate relevant model permissions. * **Enterprise-dedicated lines**: Support high concurrency of 30 million TPM by default, with inclusive line support. * **Request Volume Monitoring**: Visit the [Request Log Page](https://www.cometapi.com/console/log) to observe RPM request volume changes. *** # About maintenance * **Multi-channel distribution**: * When a channel fails, the system automatically switches to other channels and retries multiple times. * If a channel crashes, the system will **automatically restart within 5 minutes**. * **Error handling**: * If models return error messages in high-concurrency scenarios, contact customer service for assistance. * **403 Error**: May be triggered by the WAF defense mechanism. Contact customer service to check if the URL is blocked. * **Scheduled Maintenance Time**: * **1-5 AM**: Scheduled tasks, database maintenance, memory release, etc. may cause temporary instability or interruptions. * **Recommendation**: Users with batch concurrent requests should implement reconnection mechanisms and save request data. # Privacy statement * **Recorded Information**: To ensure service quality and network security, we record users' **request IP addresses**, **request frequency**, and **service quota usage**. * **Privacy Commitment**: * Apart from necessary service log information, we do not collect any other personal request data. * We **do not store user request content**, ensuring maximum respect and protection of user privacy. *** # Recharge discounts * **Rules**: The more you recharge, the bigger the discount, with transparent pricing and no hidden fees. * We never use tactics like "ultra-low prices" or "multipliers that are n times the official website". * **Recharge Discounts**: * **Cumulative recharge of 3000+ yuan** or **stable daily consumption of over 100 dollars**, for enterprise customers, contact customer service for permanent recharge or consumption discounts. *** # About abnormal charges * **Handling steps**: 1. Check the **request IP** in the **request logs**. * If it's an unfamiliar IP, your Key may have been leaked. 2. **Solution**: * Disable or delete the leaked API key and create a new one. * **Protect your API key**: Do not share API keys or enter them on unknown websites. * **Open Source Program Considerations**: * If using personally built open-source AI programs, be sure to: * Set up site passwords. * Do not save API keys through environment variables; use form submissions instead. * Modify the **header** and **footer** characteristic information of open-source programs to prevent malicious scanning and unauthorized usage. *** # About recharge credits * **Delay Explanation**: Some network recharges may have a 1-3 minute delay. Please be patient. * **If not credited after 10 minutes**: 1. Contact customer service with payment screenshots and order numbers. 2. We will manually process your order. *** # Contact customer service * Support: [https://www.cometapi.com/support/](https://www.cometapi.com/support/) * Official Website: [https://www.cometapi.com](https://www.cometapi.com)