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Pricing and Balance

Currency

For Nexus users, all settlement and billing remains in rubles. The interface can display values as RUB, USD, EUR, or CNY:

  • balance top-ups;
  • actual-usage or fixed per-request charges;
  • balance adjustments.

USD/EUR/CNY are display-only conversions using the official CBR rate. The balance, prices, top-ups, expenses, and history remain in RUB; changing the display currency never changes the amount charged or the operation history.

Test Access

When Free API trial appears in the Telegram bot, subscribe to the news channel and press Check subscription. The bot issues the short-lived trial key automatically. Leaving the channel revokes it permanently. The trial does not require a support request. Billing is in rubles only.

Live Prices

These are final Nexus retail prices per 1 million tokens or per request, depending on the model billing mode. Choose RUB, USD, EUR, or CNY. CNY is shown only as a final user price, never as a price source or calculation. Check model availability for a specific key with GET /v1/models.

Loading current prices…

If loading fails, the table does not show values under an incorrect currency label.

How Balance Works

  • the balance is tracked at the Nexus profile level;
  • multiple API keys on the same profile spend the shared profile balance;
  • if there are not enough funds, a new request is rejected;
  • after a top-up, the profile can be used again;
  • if the balance drops below the low-balance threshold, the Telegram bot may send a top-up reminder with a top-up button.

The low-balance reminder is sent once for each downward threshold crossing. After a top-up or another operation that brings the balance back to the threshold or above, the reminder can be sent again on the next drop.

Check the current balance with:

curl -H "Authorization: Bearer $NEXUS_API_KEY" \
  https://api.nexus-hub.ru/v1/balance

What Happens During a Request

  1. Nexus checks the key, model, and balance.
  2. The request runs without a temporary balance reservation.
  3. Complete usage is charged at its actual cost. Fixed-price models are charged once for a successful protocol-compatible response.
  4. Concurrent requests already in progress may take the balance below zero. The next request is rejected until the balance is topped up.

If official usage is missing or contradictory, Nexus does not charge it later. There is no hidden or later backcharge.