## Engines

**Business → Engines** (*Translation engines*).

An engine without **credentials** (an API key) runs as a *mock* — no paid calls happen by accident.

Engine fields:

- **Key** — a unique code (fixed after creation);
- **Level** — *Economy*, *Quality* or *Baltic*;
- **Mode** — *Real-time* or *Batch*;
- **Enabled**;
- **Available to plans** (none ticked = all);
- **Options (JSON)**.

**Test connection** checks the key. Deleting an engine moves its companies to the *mock*.

## Prices and usage

**Business → Prices and usage** (*Translation prices*).

- **Sale price = cost × (1 + markup)**.
- Markup: **company → plan → global**. An empty plan field = global; an empty company field = plan.
- **Price table (costs)** — changing a price adds a new row with a later **Valid from** date (history is kept).
- A usage table per company and month: **Costs**, **Sales**, **Margin**.

Companies only see their **sale price**, never the cost or margin.

> An engine without a price shows up in **To-do**.