Google AI Studio offers a free tier — no billing required to start. The free tier has rate limits that may occasionally slow responses under heavy use, but is sufficient for typical Velocity AI coaching and training plan generation.
Go to aistudio.google.com and sign in with your Google account. No separate signup is needed.
Click + Create API key. A dialog will appear asking you to choose a Google Cloud project. Select Create API key in new project — this is the easiest option and requires no additional setup.
After creation, your key appears in the API keys table. Click the copy icon to copy it. Your Gemini key begins with AIza.
Open Velocity AI, go to Profile → AI Provider. Select Gemini, paste your key, then tap Save.
gemini-2.5-flash automatically — no model selection needed.