How to pay for an LLM API with USDT

TRC-20 or ERC-20: which network should I use?

Use the one your USDT already sits on, if you can. Moving it from one network to another costs a conversion or a bridge.

If you are buying USDT for the purpose, Tron is usually cheaper to send small amounts on; Ethereum fees vary more with traffic. The payment page names the network it expects, and the transfer must use exactly that one. USDC is accepted on Ethereum only; the other coins we take are BTC, USDT, USDC, ETH, SOL, LTC.

Which three mistakes cost money?

• The wrong network. USDT sent on BNB Chain or Solana to our Tron address does not arrive where we can see it. Funds sent on the wrong network or in the wrong coin may be lost for good.
• An amount that changed on the way. Some exchanges take their withdrawal fee out of the amount you type. Check the “amount received” line and make it match the payment page; we match payments by their exact amount.
• A transfer inside an exchange. Sending to another user of the same exchange is not an on-chain transfer, so it never reaches our address. Use a withdrawal to the address shown.

How long until I can call the API?

As long as the network takes to confirm, plus our check. The payment page states how many confirmations each network needs and shows where your transfer stands. Once the balance is credited and the pack is bought, the key works straight away.

If a transfer seems stuck, write to [email protected] with the transaction ID. A person answers support emails within 12 hours, seven days a week, and helps you point your SDK or agent at the API.

What happens to USDT I do not spend?

It stays as credit. Credit has no expiry date: what you do not spend this month is still there next year. Credit on your balance does not expire and pays for tokens on any model, whenever you call the API. When a pack costs less than the minimum top-up, the part you paid only to reach that minimum comes back on request within 30 days of payment, in USDT or USDC, provided it is still unspent. The rest of a balance is not paid out unless the law requires it.

The refund policy has the full rule: A credit pack bought in the last 72 hours goes back to your balance if less than 20% of it was spent. If the API does not work for you and support cannot fix it within 24 hours, the unspent credit goes back to your balance. Top-ups stay on the balance and are not paid out unless the law requires it; whatever you added only to reach the minimum top-up comes back on request within 30 days, in USDT or USDC, as long as it is unspent.