What is an API Key?
An API key is a unique string used to authenticate requests to an API (Application Programming Interface). It acts like a password that identifies who is making the request, controls what they can access, and enables the API provider to track usage and enforce rate limits. When you sign up for OpenAI, Anthropic, or any other API service, you receive an API key that you include with every request.
API keys are the primary mechanism for accessing LLM services. Every time an AI agent sends a prompt to Claude, GPT, or Kimi, the request includes an API key that authenticates the caller and determines billing. Managing these keys securely is critical -- a leaked API key can result in unauthorized usage, unexpected bills, and potential data exposure.
In the context of AI agent hosting, API key management is a core architectural concern. The platform must decide whether to use its own pooled keys (managed model access) or let users provide their own (BYOK), and must ensure keys are stored securely and never exposed to unauthorized parties.
How API Keys Work
- Authentication -- The key proves the identity of the requester to the API server
- Authorization -- The key determines which endpoints, models, and features the requester can access
- Usage tracking -- The provider tracks requests and token consumption per key for billing
- Rate limiting -- Providers enforce per-key limits on request frequency and volume
- Revocation -- Keys can be disabled instantly if compromised or no longer needed
Why API Key Security Matters
A leaked API key is a security incident. If someone obtains your OpenAI API key, they can make requests on your account, potentially running up thousands of dollars in charges. They may also be able to access your usage history, fine-tuned models, or other account resources. API keys should never be committed to code repositories, shared in plain text, or stored in client-side code.
How KiwiClaw Handles API Keys
KiwiClaw offers two approaches. Standard tier users get managed LLM access -- pooled API keys live only in the LLM proxy and are never exposed to tenant machines. Tenants authenticate using per-tenant JWTs, not raw API keys. BYOK tier users provide their own API keys through the secure dashboard settings, and their agents connect directly to providers -- bypassing the proxy entirely.
Related Terms
Frequently Asked Questions
What is an API key?
An API key is a unique string used to authenticate requests to an API service. It identifies the requester, controls access to specific features, enables usage tracking for billing, and can be revoked if compromised.
Why are API keys important for AI?
Every LLM API request requires an API key for authentication and billing. Managing these keys securely is critical -- leaked keys can result in unauthorized usage, unexpected charges, and potential data exposure.
How does KiwiClaw handle API keys?
Standard tier users get managed LLM access with pooled keys secured in the LLM proxy. BYOK users provide their own keys through the dashboard. In both cases, raw API keys are never exposed to tenant agent machines.