# Core

## Core overview

Core provides the foundational endpoints you need before sending remittances.
Use these to standardize error handling, quote rates, monitor balances, and manage secrets.

<CardGroup cols={2}>

<Card title="Error Codes">
Reference catalogue for consistent errors, troubleshooting, and support handoffs.
</Card>

<Card title="Exchange rate">
Retrieve corridor rates/quoting data used in Link flows and UX price guarantees.
</Card>

<Card title="Balance">
Check balances for reconciliation, payout readiness, and operational monitoring.
</Card>

<Card title="Secrets">
Manage sensitive client configuration with rotation and least-privilege access.
</Card>

</CardGroup>

:::tip
Treat Core as a dependency: keep it stable, versioned, and well-documented across environments.
:::