How to get an API key

OpenAI

Steps

1. Sign in or create an account at platform.openai.com. OpenAI may ask you to verify a phone number.
2. Open API keys and choose Create new secret key. Give it a name, like “LockSet”, and pick a project.
3. Add a payment method or prepaid credit under Billing. You can also set a monthly budget for the project.
4. Copy the key (it starts with sk-) straight away, since it’s shown only once, and paste it in Settings › AI assistant.

What it costs

Pay as you go: each request is billed by the tokens it uses, and smaller models cost less. You can set a monthly limit in your OpenAI account.

Open OpenAI’s key page Billing Pricing

Anthropic (Claude)

Steps

1. Sign in or create an account in the Claude Console at platform.claude.com.
2. Open API keys and choose Create key. Name it, pick an expiration, and choose a workspace (the Default workspace is fine).
3. Add credit under Billing.
4. Copy the key (it starts with sk-ant-) straight away: it’s shown only once. Paste it in Settings › AI assistant.

Choose a workspace for the key. Anthropic refuses a key without one unless every request names a workspace, which LockSet doesn’t do. When a key expires, the assistant stops until you paste a new one.

What it costs

Each request is billed by the tokens it uses, from the credit on your account. Smaller models (Haiku, Sonnet) cost less than Opus.

Open Anthropic’s key page Billing Pricing

Google Gemini

Steps

1. Sign in with your Google account at aistudio.google.com and accept the terms. AI Studio creates a Google Cloud project for you. If you already use Google Cloud, import a project first (Dashboard › Projects › Import projects).
2. Open Get API key and choose Create API key. New keys work only with the Gemini API, which is all LockSet needs.
3. Have an older key marked Unrestricted? Choose Add restrictions › Restrict to Gemini API only: the Gemini API no longer accepts unrestricted keys.
4. Copy the key and paste it in Settings › AI assistant.

What it costs

Google offers a free tier with lower limits, and paid use once you turn billing on. Read Google’s terms on how free-tier requests may be used.

Open Google Gemini’s key page Pricing

Your own server

1. Run a model server with an OpenAI-style API, like Ollama or LM Studio, or use a gateway like OpenRouter.
2. Make it reachable over HTTPS, for example with a reverse proxy or Tailscale HTTPS. Phones block plain http://.
3. Choose OpenAI-compatible in Settings › AI assistant, enter its Endpoint URL, and a key if it needs one.

What it costs

Your own server costs nothing per request (it uses your hardware). A gateway bills you itself.

Add the key to LockSet

1. Open Settings › AI assistant and pick the provider.
2. Paste the key and tap Check connection. That lists the models your key can use; only the key is sent, no workout data.
3. Pick a model and tap Turn on the AI assistant.
4. Before the first request, LockSet shows exactly what it sends and to whom. Nothing goes out until you agree.

How much one answer uses

One answer from the assistant is one request of about 15,000 tokens. Most of it is the exercise list and instructions, which stay the same between requests, so a follow-up within a few minutes bills them at a fraction of the price. LockSet also stops at a daily number of messages, a guard against surprise costs (Settings › AI assistant › Daily limit).

Keep it safe

Treat the key like a password. LockSet keeps it in the device’s secure storage (Keychain or Keystore) and sends it only to the provider, in a request header. It’s never in backups or exports. If it ever leaks, delete it in your provider account and create a new one.

What the assistant sends

Your plan, the last 12 weeks of training, body weight, your message and a few preferences, and only after you agree. Never your name, photos, measurements, gym cards, heart rate or body fat. Details in the privacy policy.