Get Your API Key

Prompterjack supports multiple AI providers. Pick one and follow the guide below.

Quick Start

Groq and Gemini both offer free API keys — great for trying Prompterjack without any cost. For the best quality output, Claude (Anthropic) is recommended but requires purchasing API credits from Anthropic.

FREEGroq

Groq provides very fast inference with a generous free tier. Uses Llama 3.3 70B.

  1. Go to console.groq.com/keys
  2. Sign up or log in (Google/GitHub auth available)
  3. Click "Create API Key"
  4. Name it (e.g. "Prompterjack") and copy the key

Your key will look like: gsk_...

FREEGemini (Google)

Google's Gemini offers a free tier through AI Studio. Uses Gemini 1.5 Flash.

  1. Go to aistudio.google.com/apikey
  2. Sign in with your Google account
  3. Click "Create API Key"
  4. Select a Google Cloud project (or create one) and copy the key

Your key will look like: AIza...

PAIDClaude (Anthropic)— Recommended for best quality

Claude produces the highest quality prompts. Requires purchasing API credits from Anthropic.

  1. Go to console.anthropic.com
  2. Create an account and add a payment method under Billing
  3. Navigate to Settings → API Keys
  4. Click "Create Key", name it, and copy it

Your key will look like: sk-ant-api03-...

Security & Privacy

  • • Saved only in local storage in this browser — it never leaves your device until you generate.
  • • Sent once per generation, in the JSON body of a same-origin POST to /api/generate — never as a header, never cross-origin.
  • • The Worker forwards it to your chosen provider through the Cloudflare AI Gateway, for that one request only.
  • • Inside the Worker, it travels in the JSON body of the request the Gateway call itself makes — never a header on that request either.
  • • It is not written to any store we control — no database, no KV namespace, no log line — and is replaced with a redacted placeholder before any error is logged.
  • • No BYOK model is currently selectable in the model picker, so a saved key here is not used automatically — it only takes effect if a BYOK model (Claude or Gemini, billed to your own account) is re-enabled.
  • • A saved key stays in this browser until you clear it yourself — signing out does not remove it. While it is stored, it unlocks premium-feature UI locally (Agent Architect and other BYOK-offset features), whether or not you ever generate with a BYOK model.

Troubleshooting

"Failed to fetch" error?

This usually means the API is temporarily unavailable. Try again in a moment.

Key not working?

Make sure you copied the full key and that you're using the correct provider tab under Profile → API Keys. Groq keys start with gsk_, Gemini keys start with AIza, Claude keys start with sk-ant.

Quota exceeded?

Free tiers have rate limits. If you hit a quota error, wait a minute and try again, or switch to a different provider.