A privacy-first tool to validate LLM API keys instantly — client-side, no server, no logging.

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Support Development

If this project helps your work, support ongoing maintenance and new features.

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Features

• Zero friction: Paste keys → click button → get results
• Multi-vendor support: OpenAI, Anthropic, Google Gemini, Groq, Perplexity, HuggingFace, Replicate, and more
• Privacy-first: All checks run client-side in your browser
• Detailed results: View models, latency, rate limits, and error messages
• Dark mode: Built-in theme toggle
• API Access: Use via curl or any HTTP client
• CLI Tool: Command-line interface for automation and scripting

Screenshots

Landing Page

Validation Results

History Panel

API Usage

CheckAPIs can be used programmatically via HTTP API:

# Check single key
curl -X POST https://checkapis.pages.dev/api/check \
  -H "Content-Type: application/json" \
  -d '{"keys": ["sk-proj-..."]}'

# Check multiple keys
curl -X POST https://checkapis.pages.dev/api/check \
  -H "Content-Type: application/json" \
  -d '{"keys": ["sk-proj-...", "sk-ant-api03-...", "AIzaSy..."]}'

Response:

{
  "success": true,
  "count": 1,
  "results": [
    {
      "key": "sk-proj-...",
      "provider": "openai",
      "valid": true,
      "models": ["gpt-4", "gpt-3.5-turbo"],
      "latency": 245,
      "rateLimit": "5000"
    }
  ]
}

Rate Limiting: 20 requests per minute per IP. See docs/API.md for full documentation.

CLI Usage

# Install and build
npm run build:cli

# Validate keys
node dist/cli/cli/index.js sk-proj-...
node dist/cli/cli/index.js -f keys.txt
cat keys.txt | node dist/cli/cli/index.js --json

See docs/CLI.md for full CLI documentation.

Supported Providers

• OpenAI
• Anthropic (Claude)
• Google Gemini
• Groq
• Perplexity
• HuggingFace
• Replicate
• Together AI
• Cohere
• Mistral
• AWS Bedrock (detection only)
• Azure OpenAI (detection only)

Development

npm install
npm run dev

Open http://localhost:3000

Build

npm run build

Static files will be generated in the out directory.

Deploy to Cloudflare Pages

Via Dashboard

1. Build the project: npm run build
2. Go to Cloudflare Pages
3. Create a new project
4. Upload the out directory

Via Wrangler CLI

npm install -g wrangler
wrangler pages deploy out --project-name=checkapi

Or use the deployment script:

./scripts/deploy.sh

Via GitHub Actions

Connect your GitHub repository to Cloudflare Pages. The build settings:

• Build command: npm run build
• Build output directory: out
• Root directory: /

See docs/DEPLOYMENT.md for detailed instructions.

Privacy & Security

• All API key validation happens in your browser
• Keys are never sent to any proxy server
• Keys are never logged or stored
• Displayed keys are always truncated (first 8 characters only)

SEO & LLM Visibility

CheckAPI is optimized for both traditional search engines and AI-powered search (ChatGPT, Claude, Perplexity):

• Structured Data: JSON-LD schema with FAQPage, WebApplication, and Organization markup
• LLM Optimization: llms.txt file for direct AI crawler access
• AI Crawler Permissions: Explicit allowances for GPTBot, Claude-Web, PerplexityBot
• Open Graph: Dynamic social sharing images
• Sitemap & Robots: Optimized for crawl efficiency

See docs/SEO.md for full documentation.

Tech Stack

• Next.js 16 (App Router)
• TypeScript
• Tailwind CSS
• Lucide React (icons)
• Static export for Cloudflare Pages

Project Structure

├── app/              # Next.js app router pages
├── cli/              # CLI tool
│   ├── index.ts      # CLI entry point
│   └── tsconfig.json # CLI TypeScript config
├── components/       # React components
├── docs/            # Documentation
│   ├── API.md       # API documentation
│   ├── CLI.md       # CLI documentation
│   ├── DEPLOYMENT.md
│   ├── RATE_LIMITING.md
│   └── roadmap.md
├── functions/       # Cloudflare Pages Functions
│   └── api/
│       └── check.js # API endpoint with rate limiting
├── lib/             # Utility functions
│   ├── cli.ts       # Node-compatible exports
│   └── index.ts     # Browser exports
├── public/          # Static assets
├── scripts/         # Deployment and utility scripts
├── tests/           # Test scripts
└── wrangler.toml    # Cloudflare configuration

License

MIT

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💼 Services Offered

• 🔒 Privacy-First Development - P2P applications, encrypted communication, zero-knowledge systems
• 🚀 Web Application Development - Full-stack development with Next.js, React, TypeScript
• 🔧 WebRTC Solutions - Real-time communication, video/audio streaming, data channels
• 🛡️ Security Tool Development - Burp extensions, penetration testing tools, automation frameworks
• 🤖 AI Integration - LLM-powered applications, intelligent automation, custom AI solutions

Get in Touch: teycirbensoltane.tn | Available for freelance projects and consulting

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Built with 💚 by Teycir Ben Soltane