> ## Documentation Index
> Fetch the complete documentation index at: https://docs.synapsai.cloud/llms.txt
> Use this file to discover all available pages before exploring further.

# Billing

> Purchase credits, set up auto-pay, and review usage on SynapsAI Cloud

SynapsAI Cloud uses a credit system. Credits are equivalent to US dollars and pay for compute, storage, and inference. Credits are valid indefinitely but are not transferable, refundable, or exchangeable for cash.

For how compute and storage are priced, see [Core concepts](/core-concepts).

## Purchasing credits

1. Open [Billing](https://platform.synapsai.cloud/billing).
2. Click **Purchase Credits**.
3. Complete checkout on the Stripe payment page.

## Transaction history

The [Billing](https://platform.synapsai.cloud/billing) page shows all successful credit purchases.

## Auto-pay

Auto-pay adds credits automatically when your balance drops below a threshold, preventing interruptions to running deployments.

<Steps>
  <Step title="Configure thresholds">
    On the [Billing](https://platform.synapsai.cloud/billing) page, set:

    * **When balance is below** — triggers auto-pay
    * **Recharge with** — credits added per recharge
  </Step>

  <Step title="Set up a payment method">
    Click **Setup Auto-pay** and complete payment setup on Stripe.
  </Step>

  <Step title="Confirm">
    Auto-pay runs automatically when your balance falls below the threshold.
  </Step>
</Steps>

## Invoices

The [Billing](https://platform.synapsai.cloud/billing) page lists invoices for auto-pay transactions.

## Cost monitoring

Track per-model spend on each model's **Analytics** tab. Combine this with [optimizing costs](/guides/optimizing-costs) strategies — readiness level, quantization, and autoscaling — to control spend.

## Starter credits

New accounts receive starter credits to explore the platform. Check your balance on the Billing page before deploying large models.