Start here
Register with your email address, then sign in to the LinknLink AI platform.
Open the LinknLink AI platform and click the Sign up tab. Type in your email address and click Send code. A code arrives in your inbox. Fill in that code, choose a password, then type the same password again to confirm it. The nickname box can be left empty.
Select Sign in and enter your registered email address and password. After signing in, you will see Subscription and Pay as you go in the left menu. Do not configure both: you will choose one after recharging your balance.
Optional
Skip this section if you do not have a cash voucher or discount code.
A cash voucher adds money to your account balance. You can use that balance for pay-as-you-go requests or to buy a subscription plan. Go to Pay as you go → Account wallet and select Redeem cash voucher.
A discount code makes everything on your account cheaper. Go to Pay as you go, then API Key, type the code into the Bind or change discount code box, and click Bind discount code.
Required for both options
Both pay-as-you-go usage and subscription purchases require account balance. Complete this step before choosing a billing option.
Go to Pay as you go → Account wallet. Under Recharge (PayPal), select one of the amounts shown or enter your own amount, then select Pay.
Recharge payments are processed through PayPal and your balance is held in US dollars. Make sure the balance covers either your expected usage or the full price of your selected plan.
Choose one path
Select one option below. The page will show only the API Key and test steps for that option—you do not need to complete both.
Select a billing option above to continue.
Create a regular API Key and test it. Charges will come from the balance you recharged in Step 3.
Go to Pay as you go → API Key and select Create regular APIKEY. Enter a name for the key, then create it.
Select Copy in the Actions column to copy the complete key. Store it securely and never share it publicly. Anyone with this key can use your account balance.
A fixed-quota API Key also uses your account balance, but lets you set a spending limit. Use one when you want to give somebody controlled access.
Paste the regular API Key you just copied. The command below will update automatically, so you do not need to replace the example text yourself.
The key stays in this browser tab and is not saved or uploaded. It will appear in the command below, so do not share screenshots containing the command.
Paste the complete API Key beginning with sk-.
Use the following values in any OpenAI-compatible app, or run the generated command in Terminal on macOS or Linux or in PowerShell on Windows.
https://api.linknlink.ai/modelhub/v1gpt-5.6-solsk-...curl https://api.linknlink.ai/modelhub/v1/chat/completions \
-H "Authorization: Bearer sk-replace-with-your-LinkAI-key" \
-H "Content-Type: application/json" \
-d '{
"model": "gpt-5.6-sol",
"messages": [{"role": "user", "content": "reply only ok"}]
}'A short model response means the key is ready to use.
Buy a plan with your account balance, then get and test the API Key assigned to that plan.
Go to Subscription, choose a plan, and confirm the purchase. The full plan price is deducted from the account balance you recharged in Step 3. The plan becomes available as soon as the purchase succeeds.
If your balance is lower than the plan price, return to Account wallet and recharge the difference before trying again.
Go to Subscription → Plan details. Under How to call this plan, copy the API Key and Base URL. This API Key belongs to the plan and is different from a regular pay-as-you-go API Key.
Current plan lists the models included in your plan, your remaining allowance, and the next reset time. Use one of those model names when making a request.
Paste the plan API Key you just copied. The command below will update automatically.
The key stays in this browser tab and is not saved or uploaded. It will appear in the command below, so do not share screenshots containing the command.
Paste the complete API Key beginning with sk-.
Run the generated command to confirm that the plan key can list the available models:
curl https://api.linknlink.ai/modelhub/v1/models \
-H "Authorization: Bearer sk-replace-with-your-LinkAI-key"If the request returns a model list, the plan API Key and Base URL are working.
After purchase, requests made with the plan API Key consume the plan allowance. They do not deduct normal pay-as-you-go usage charges from your account balance.
After your test succeeds
Use the API Key and Base URL from your selected billing path. Choose the guide that matches how you will use them.
If you want to use your key in a coding tool on your own computer, the personal guide walks you through it on Mac, Windows and Linux. It also shows you how to go back to the original settings whenever you want.
For a team, one person sets up a shared gateway on a Linux computer and gives every colleague their own key. Your own key stays on that computer and never goes anywhere else, and any colleague's key can be switched off on its own.