Question 1

What is Spark?

Accepted Answer

Spark is an OpenAI- and Anthropic-compatible API gateway. It exposes Google's Gemini models — and flagship Antigravity models like Claude and GPT-OSS — behind a single base URL, so any OpenAI or Claude SDK works unchanged.

Question 2

Is it really a drop-in replacement?

Accepted Answer

Yes. Point your existing OpenAI or Anthropic client at https://spark.payfara.com/v1 and use a Spark API key. Chat, streaming, vision, tools, image generation, embeddings and the Responses API are all supported.

Question 3

Which models can I use?

Accepted Answer

Gemini 3 Pro, Flash and Flash-Lite, Gemini image generation, plus Claude, GPT-OSS and more through the Antigravity backend. Your available models are auto-discovered from your connected account.

Question 4

Do I need a Google account?

Accepted Answer

Yes — Spark connects to your own Google/Gemini session. Install the one-click Chrome extension or paste your cookies in the dashboard, and Spark provisions an API key bound to your account.

Question 5

Is there a free plan?

Accepted Answer

Yes. The Free plan includes 300 requests per month at no cost, with no credit card required. Upgrade to Gemini for unlimited Gemini usage, or Antigravity to unlock Claude and GPT-OSS.

Question 6

How secure is it?

Accepted Answer

You sign in to the dashboard with Google. Your Gemini session is connected either via the one-click extension or by pasting your cookies, and Spark stores only what's needed to keep that session alive. Your raw API key is shown once, never stored in plain text, and you can rotate or revoke keys at any time.

Question 7

Does it work with n8n, LangChain and Claude Code?

Accepted Answer

Absolutely. Anything that speaks the OpenAI or Anthropic API works — n8n, LangChain, LlamaIndex, the Vercel AI SDK, Claude Code, Cline, Cursor and more.