Warranty and refunds at the Cho Tai Khoan API gateway
This page puts the whole exchange, refund and warranty policy of the gateway into writing — so you can check it any time instead of asking an admin again. The principle throughout: if the fault is on our side, we carry it; your real usage is yours, and every charge can be verified.
Refunds and key replacement
A fault on our side within the first 7 days of purchase (a key that does not work, a prolonged gateway outage, a wrong quota charge): you choose a new key or a 100% refund of that package price.
If you have used more than 20% of the quota of a package, it is no longer refundable — because most of the value of the package has been consumed. You still get normal technical support.
Refunds are made through the same channel you paid with (bank transfer/MoMo/USDT), after the shop verifies the fault on the system — usually processed within a working day.
Quota charges and cases where you never lose money unfairly
Failed calls are never charged quota — only successful calls count, at the real token usage (the formula is on the API pricing page).
An unused redeem code is kept for up to 30 days from its issue date; after that the code is locked. Please redeem your code soon after buying.
Package validity counts from the moment you redeem the code, not from payment — you can buy ahead and keep it, as long as you redeem within 30 days.
Key expired or out of quota midway: buy any other package, the quota stacks onto your old key, and there is no need to configure anything again.
Cases the warranty does not cover
You expose your own key (posting it publicly, committing it to a public code repository…) and someone else uses up the quota.
Wrong configuration on the side of your tool (wrong address, wrong model name) — the shop still helps you fix it, but tokens from calls that succeeded are not refunded.
A model is changed or discontinued by its provider: the shop will announce it and guide you to an equivalent model on the same key.
How to ask for support
Message us on Telegram @chotaikhoandotcom with the last 4 characters of your key and a description of the error (a screenshot if you have one). The shop cross-checks on the system log — every charge is recorded, so verification is very fast. See also the FAQ.
This policy applies to the API gateway. Products on the main store chotaikhoan.com have their own warranty policy written on each product page.
Try the smallest package to verify it yourself
The Starter package at $0.72 (≈ 19.000đ) — the policy on this page applies in full to even the smallest package, so you can verify how the shop operates before buying bigger.