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

# Glossary

> Terms that show up across the dashboard and docs.

<AccordionGroup>
  <Accordion title="Available balance">
    The part of your wallet you can spend on a new rental. Excludes
    `reserved` (held against running rentals). Shown in the top-right pill.
  </Accordion>

  <Accordion title="Auto-topup">
    Automatic Stripe charge to refill your wallet when it dips below a
    threshold. Requires a saved card. See
    [Topping up](/guides/topping-up#auto-topup).
  </Accordion>

  <Accordion title="Family">
    A GPU model line (e.g. `h100-80gb`). Distinct from a **listing**, which
    is one seller's specific machine within that family.
  </Accordion>

  <Accordion title="Family ID">
    The canonical string identifier for a family in the API:
    `rtx-4090`, `rtx-5090`, `a100-80gb`, `h100-80gb`, `b200`, `b300`.
  </Accordion>

  <Accordion title="Ledger">
    Append-only history of every wallet movement.
  </Accordion>

  <Accordion title="Listing">
    One seller's specific machine on the marketplace — a GPU model, VRAM,
    region, and hourly price. The catalog returns many listings per family; the
    marketplace surfaces the cheapest matching one.
  </Accordion>

  <Accordion title="Pod">
    Slang for an **instance**. We use them interchangeably across the docs.
  </Accordion>

  <Accordion title="Prepaid wallet">
    Our billing model — you deposit credit, instances burn it per second.
    No invoices, no monthly bills.
  </Accordion>

  <Accordion title="Reserved balance">
    The portion of your wallet held against currently-running rentals.
    Each rental reserves 1 hour at its rate. As the rental runs, the
    reserve drains.
  </Accordion>

  <Accordion title="Rental">
    A single instance lifecycle from launch to settlement. Identified by a
    `rent_…` ULID. Synonyms: instance, pod.
  </Accordion>

  <Accordion title="Session cookie / sid">
    The `sid` HttpOnly cookie set on sign-in. Carries no user data
    server-side — it's a random 256-bit token that maps to a session row.
  </Accordion>

  <Accordion title="Template">
    The starting image for a pod: `ubuntu-24-04`, `pytorch`, `vllm`, etc.
    See [Instances](/concepts/instances).
  </Accordion>

  <Accordion title="ULID">
    The 26-character ID format used everywhere
    (`01HZ3J9X8K2P5T7R4W1Q6Y8M0E`). Sortable by creation time,
    URL-safe, no hyphens. Prefixed with type (`usr_`, `rent_`, etc.) for
    legibility.
  </Accordion>

  <Accordion title="Marketplace">
    The two sides of GPU Outlet: the **buyer catalog** of machines you can rent,
    and the **Sell** side where you list your own GPU box. See
    [Sell your GPUs](/guides/selling).
  </Accordion>

  <Accordion title="On-demand">
    The service tier billed at the headline price and never reclaimed — the
    machine is yours until you stop it.
  </Accordion>

  <Accordion title="Seller Rating">
    A 0–100 score on each supplier listing that blends uptime, cleanly finished
    sessions, buyer ratings, support responsiveness, honest specs, and time on
    the platform.
  </Accordion>

  <Accordion title="Service tier">
    How you rent a machine: **On-demand** or **Spot** — a trade-off between price
    and how long you're guaranteed to keep the GPU. See
    [Instances → Service tiers](/concepts/instances#service-tiers).
  </Accordion>

  <Accordion title="Spot">
    A cheaper service tier that may be reclaimed if a full-price on-demand buyer
    needs the GPU. You're only charged for the time you actually ran.
  </Accordion>

  <Accordion title="Spot">
    The cheapest service tier, and the first to be reclaimed when a full-price
    buyer needs the GPU. Save your work often.
  </Accordion>

  <Accordion title="Verified">
    A badge on a supplier listing shown once the machine has passed automated
    hardware checks (model, memory, and a quick benchmark).
  </Accordion>

  <Accordion title="VRAM">
    GPU memory, in GB. The number you care about for whether your model
    fits.
  </Accordion>

  <Accordion title="Wallet">
    The per-user credit balance. There's exactly one per account. Three
    numbers: available, reserved, total.
  </Accordion>

  <Accordion title="Webhook">
    Outbound HTTP call from Stripe to our server confirming an event
    (`checkout.session.completed`, `setup_intent.succeeded`, etc.). We
    require these to trust that Stripe really collected the money.
  </Accordion>
</AccordionGroup>