Quick Start

1. Register and sign in

Open Fast API, click Get Started or Sign In, and create an account with a username, password, email address, and email verification code.

After signing in, the site opens Overview. Continue through the sidebar.

2. Choose a model and check quota

1. Open the model catalog and filter by provider, capability, or pricing type.
2. Open the model details and confirm its name, supported protocol, and price.
3. Use Wallet to review balance, top up, purchase a subscription, redeem a code, or inspect billing history. Visible features depend on site configuration.

3. Create an API key

Open API Keys in the sidebar or go directly to the API Keys page:

1. Click Create API Key.
2. Enter a name and select an available group.
3. Optionally set expiration, quantity, and per-key quota. Leave Unlimited Quota enabled when no per-key limit is required.
4. Expand Advanced Settings to restrict models or IP/CIDR ranges.
5. Save, then use the copy button in the key table to obtain the full key. Click the masked value when you need to reveal it.

WARNING

An API key grants access to your account quota. Never publish it on a website, in a public repository, or in a chat message.

4. Verify in Playground

Open Playground, select the model, and send a simple message. This verifies your account, model, and platform routing before you configure an external client.

5. Send your first API request

Replace YOUR_API_KEY and MODEL_ID with your actual values:

curl https://www.fastapi.cool/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "MODEL_ID",
    "messages": [
      {"role": "user", "content": "Introduce yourself in one sentence."}
    ]
  }'

A JSON response means the connection is working. For Responses, Claude, or Gemini compatible models, use the matching example in API Usage.

6. Review the result

• Usage Logs: standard API requests, charges, latency, request IDs, and errors.
• Task Logs: image, video, and other asynchronous tasks.
• Overview: balance, keys, and recent usage.
• Dashboard: model call analytics and trends.

See New Console Workflow for the complete page map.