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

# Simulate Margin

Simulate margin impact of pricing or cost changes before applying them.

**Auth:** `sk_` only

<Warning>
  All margin endpoints require a secret key (`sk_`). These endpoints expose cost data that should never be visible to your end users.
</Warning>

<ParamField body="plan_code" type="string" required>
  Plan code to simulate changes for
</ParamField>

<ParamField body="new_price_cents" type="number">
  New price in cents to simulate
</ParamField>

<ParamField body="cost_change_percent" type="number">
  Percentage change in cost to simulate
</ParamField>