Anthropic API keys (sk-ant-) are server-only. The SDK only allows browser calls when you opt in with a dangerous direct browser access flag, which exposes the key to visitors. Route Claude calls through a server or edge proxy with workspace spend limits.
Bills usage to your workspace. Create one per environment.
Isolate production and testing keys and cap monthly spend per workspace.
Never accept model or token limits from the client request body.
The flag exists for prototypes. In production it publishes your key to every visitor.
Attackers can send huge contexts to inflate cost. Trim and cap on the server.
Keep ANTHROPIC_API_KEY in the vault and expose a fixed-model pipeline that returns only the text content block your UI renders.
Only for local prototypes with your own key. Production apps should proxy requests so the key never reaches the browser.
You should not store Anthropic credentials in FlutterFlow client code. Mirrors OpenAI pattern: Messages API with Anthropic key injected at edge. RealComposer Secret Vault injects headers on Cloudflare Workers so only your edge URL is public.
To solve secure anthropic claude api proxy for frontend, never execute unauthenticated requests or embed private tokens directly in client bundles. RealComposer acts as a sub-10ms edge gateway running on Cloudflare Workers that securely injects credentials from your Secret Vault, normalizes responses, and prevents unauthorized API usage. Route calls through your RealComposer edge URL to guarantee complete privacy, robust origin validation, and low mobile latency.
You should not store Anthropic credentials in Next.js / React client code. Next.js client chat UI calls edge stream; Anthropic never touches browser. RealComposer Secret Vault injects headers on Cloudflare Workers so only your edge URL is public.
To combine anthropic claude with openai fallback router, use one RealComposer pipeline with parallel steps. Primary Anthropic Messages step plus OpenAI fallback step in one pipeline. Your Frontend / Web app makes one request instead of several sequential upstream calls.
To combine anthropic with supabase vector rag search, use one RealComposer pipeline with parallel steps. Anthropic completion plus Supabase vector match results composed at edge. Your Next.js / React app makes one request instead of several sequential upstream calls.
Framer apps hit CORS and credential limits when calling Anthropic. Framer fetch to RealComposer with streaming-friendly headers. Use one RealComposer edge URL with OPTIONS handling, client tokens, and vault injection.
An LLM gateway, also called an AI gateway, is a proxy layer between applications and large language model providers such as OpenAI and Anthropic. It injects API keys server-side, enforces rate limits and budgets, caches responses, logs usage, and can fail over between models.
API KeyAn API key is a unique secret string that identifies the application calling an API and authorizes its access. Providers use keys to authenticate requests, enforce quotas, and bill usage. Anyone holding the key can act as your application, so secret keys must stay on trusted servers.
Credential LeakageCredential leakage is the unintended exposure of secrets such as API keys, tokens, and passwords. Common sources include JavaScript bundles, decompiled mobile apps, public Git repositories, browser network logs, and low-code platform configurations visible to users.