Question 1

What is CheckAPI?

Accepted Answer

CheckAPI is a privacy-first web application that validates API keys for LLM providers including OpenAI, Anthropic, Google Gemini, Groq, Perplexity, HuggingFace, Replicate, Together AI, Cohere, and Mistral. All validation happens client-side in your browser, ensuring your API keys are never sent to any server.

Question 2

Which LLM providers does CheckAPI support?

Accepted Answer

CheckAPI supports 12+ LLM providers: OpenAI (GPT-4, GPT-3.5), Anthropic (Claude), Google Gemini, Groq, Perplexity, HuggingFace, Replicate, Together AI, Cohere, Mistral, AWS Bedrock (detection only), and Azure OpenAI (detection only).

Question 3

Is CheckAPI safe to use with my API keys?

Accepted Answer

Yes. CheckAPI is completely safe because all API key validation happens client-side in your browser. Your keys are never sent to any proxy server, never logged, and never stored. The application makes direct API calls from your browser to the provider endpoints.

Question 4

How do I use the CheckAPI API endpoint?

Accepted Answer

You can validate API keys programmatically by sending a POST request to https://checkapis.pages.dev/api/check with a JSON body containing your keys array. Example: curl -X POST https://checkapis.pages.dev/api/check -H "Content-Type: application/json" -d '{"keys": ["sk-proj-..."]}'. The API has a rate limit of 20 requests per minute per IP.

Question 5

Does CheckAPI have a CLI tool?

Accepted Answer

Yes. CheckAPI provides a command-line interface for automation and scripting. Install with npm, then run: node dist/cli/cli/index.js sk-proj-... or pipe keys from a file. The CLI supports batch validation and JSON output format.

Question 6

What information does CheckAPI return when validating an API key?

Accepted Answer

CheckAPI returns comprehensive validation results including: provider name, validity status, available models list, API response latency in milliseconds, rate limit information, and detailed error messages if validation fails.