Use Cursor / Cline with a cheap API: just choose OpenAI Compatible

Both Cursor and Cline let you point them at a custom API provider. Point them at the Cho Tai Khoan gateway and you can use 26 models (Claude, GPT, Gemini, DeepSeek…) with a single key, paying a fixed package from $0.72 (≈ 19.000đ) instead of per-call billing.

Step 1 — Get a key first

1. Go to the API gateway home page, pick a package and pay (USDT, VietQR or MoMo) — the system issues a redeem code automatically.
2. Redeem the code right on the page and receive a key starting with sk-ctk-.

Step 2A — If you use Cline (inside VS Code / Antigravity)

1. No Cline yet: open VS Code (or Antigravity), press Ctrl + Shift + X to open Extensions, search for Cline and press Install.
2. Click the Cline icon in the left sidebar, click the gear button (Settings) and choose API Configuration.
3. In the provider field (API Provider), choose OpenAI Compatible.
4. Fill in 3 fields: Base URL https://api.chotaikhoan.com/v1 — API Key is your key — Model ID is the name of the model you want (copy it character-for-character from the Models & pricing section on the home page).
5. Press Done to save. There is a more detailed article: the step-by-step Cline guide.

Step 2B — If you use Cursor

1. Open Cursor, go to Settings (press Ctrl + comma) and choose Models.
2. In the OpenAI API Key section: paste your key into the API key field.
3. Turn on Override OpenAI Base URL and enter https://api.chotaikhoan.com/v1 in the Base URL field that appears.
4. In the model list above, press + Add model and enter the exact name of the model you want (for example claude-sonnet-5) — the name must be copied character-for-character from the Models & pricing section on the home page; one wrong character and Cursor reports the model is not found.
5. Make sure the model you just added is enabled (switch it On), then close Settings — Cursor saves automatically.

Step 3 — Check

Test in chat with: "Reply with exactly one word: running". If the app answers "running", you are running through the gateway. To use a different model, just change the model name in the settings — the key stays the same.

Common errors

• Model not found: the model name is typed wrong — copy the exact name from the Models & pricing page again.
• Invalid key error: a missing character or an extra space when copying — copy the key again, never type it by hand.
• Out of quota: redeem another code — the quota stacks onto your old key, validity follows the new package.
• System busy: a temporary error, and that request was not charged. Wait a few minutes and try again.