ChatTempMail

ChatTempMail New Open Source Tool: LLM API Key Checker - Batch Verify Multi-Platform API Keys

Published on 2026-01-30
5 min
ChatTempMail Team
Open Source
LLM
API Key
Developer Tools

A New Addition to ChatTempMail's Open Source Ecosystem

ChatTempMail is excited to introduce a brand new open source project: LLM API Key Checker. This is a batch API key verification tool designed specifically for AI developers, helping you quickly detect and manage API keys across multiple LLM platforms.

🎯 Why You Need This Tool

With the widespread adoption of large language models, developers often need to manage API keys from multiple platforms, facing challenges like:

  • ❌ Keys may have expired, only discovered when trying to use them
  • ❌ Need to log into each platform individually to check balance
  • ❌ Manual testing for batch verification is inefficient
  • ❌ Managing multiple platforms is cumbersome

LLM API Key Checker solves all these problems in one place, supporting batch verification, real-time balance checking, and automatic detection of invalid keys.

✨ Core Features

1. Multi-Platform Support

Supports 10+ major LLM platforms, including:

Platform Balance Query Description
OpenAI ❌ ChatGPT, GPT-4 Official API
Anthropic ❌ Claude Series
DeepSeek ✅ Supports balance query
Moonshot AI ✅ Kimi Chat
Zhipu AI, Qwen, Groq, Gemini ❌ Major domestic and international platforms
Custom Platform Configurable Any OpenAI-compatible endpoint

2. Batch Verification

  • Flexible Import: Supports spaces, newlines, commas, semicolons and other separators
  • Concurrency Control: 1-50 concurrent requests, adjustable as needed
  • Real-time Progress: Streaming response, displays results as they come
  • Clear Status: Waiting, Verifying, Valid, Invalid, Insufficient Balance

3. Balance Query

Automatically retrieves account balance for supported platforms, with low balance threshold alerts.

4. Multi-Language Support

Built-in support for 20+ languages including Chinese, English, Japanese, Korean, Spanish, French, German, and more, with automatic detection or manual switching.

🚀 Technical Highlights

Built with Next.js 16, React 19, TypeScript, and Tailwind CSS 4, featuring streaming responses for real-time progress display and high-concurrency verification. Check out the GitHub repository for detailed technical implementation.

💡 Use Cases

  • Developers: Batch verify key availability before project deployment
  • Team Management: Check status and balance before distributing keys
  • DevOps Monitoring: Regularly check production environment keys to avoid service interruption
  • Multi-Platform Integration: Verify key configurations across different platforms
  • Balance Management: Monitor account balance for timely top-ups

🔒 Privacy & Security

  • Zero Storage: All keys are only used during verification, not stored or logged
  • Open Source Transparency: Code is fully open source and auditable
  • Self-Hosted: Supports local deployment for complete data control
  • HTTPS Encryption: All data transmitted securely

🛠️ Quick Start

Online Use

Visit https://check.chat-tempmail.com directly, no installation required.

Local Deployment

git clone https://github.com/Selenium39/llm-api-key-checker-next.git
cd llm-api-key-checker-next
npm install
npm run dev

For detailed deployment instructions, see the GitHub README.

📖 How to Use

  1. Select Platform: Choose the LLM platform to verify from the dropdown
  2. Configure Parameters: Set concurrency, verification prompt, balance threshold, etc.
  3. Import Keys: Paste API keys (supports multiple separators)
  4. Start Verification: Click the button to see real-time verification results
  5. View Report: Check valid/invalid keys and balance information

🤝 Open Source & Contribution

If you find it helpful, please give the project a ⭐ Star!

🎯 Future Plans

  • More platform support (Doubao, Wenxin, Spark, etc.)
  • Verification history and trend analysis
  • Balance alert notifications
  • Browser extension and CLI tool

📚 Related Resources

Other ChatTempMail Open Source Tools

Visit check.chat-tempmail.com now to try the tool. If you find it helpful, please give the project a Star ⭐

ChatTempMail Team - Continuously providing practical open source tools for developers

    ChatTempMail New Open Source Tool: LLM API Key Checker - Batch Verify Multi-Platform API Keys - ChatTempMail