If you want to start experimenting with OpenAI APIs, here’s a quick guide to get you set up. This covers account creation, generating an API key, and adding a small prepaid balance, perfect if you just want to test things out.
If you're building apps, automations, or AI agents, this is the fastest way to get your OpenAI API access ready.
1. Create your OpenAI account
Go to https://auth.openai.com/ and click Sign up.
You can create an account using your email address, or sign in with Google or Microsoft. After entering your details, you’ll need to verify your email and complete a few basic prompts.
2. Generate an API key
Once your account is ready, go to https://platform.openai.com/ and sign in.
Open the Settings menu and navigate to API Keys. Click Create new secret key , then copy the key immediately. You won’t be able to see it again after you close the dialog.
Treat this key like a password. Anyone with access to it can use your credits.
3. Add credits to your account
To use the API, you need a prepaid balance.
Go to the billing section at:
https://platform.openai.com/settings/organization/billing/overview
Click Add credit , enter your payment details, and choose an amount. The minimum top‑up is typically $5.
After confirming, your balance will be available for API usage. You may see a temporary authorization charge on your card, which is normal and usually reversed automatically.
How long does $5 last?
For simple testing, short prompts and occasional requests , a $5 credit can last for months. It depends entirely on how often you use the API and which models you call.
If you’re just learning, building small demos, or experimenting locally, $5 is usually more than enough to get started.
Monitor your usage
You can monitor your API usage and track how quickly your credits are being spent here:
https://platform.openai.com/settings/organization/usage
This is especially helpful if you’re testing with limited credits or want to keep your usage under control.
Basic security tips
Do not share your API key publicly or commit it to source control.
Use environment variables or a secure secrets manager instead of hardcoding the key in your code.
If you think your key has been exposed, delete it and generate a new one immediately.
Final thoughts
That’s all you need to start using OpenAI’s APIs. The entire process takes only a few minutes, and a small prepaid balance is enough for most beginner experiments.
Once you’re set up, you can begin building apps, automations, or integrations powered by AI.
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