> For the complete documentation index, see [llms.txt](https://docs.protocolink.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.protocolink.com/protocolink-sdk/common-sdk-interfaces/constants.md).

# Constants

Constants are values that remain fixed throughout the execution of a program, and they are usually declared at the beginning of the code. In this SDK, we have defined several constants that can be used in different parts of the code.

* A basis point is a unit of measure used in finance to describe the percentage change in a financial instrument. It is equal to 0.01%. We use a basis points base of `10,000`, which means that 1 basis point is equivalent to 0.01%. This constant can be used, for example, to calculate the interest rate or the fee percentage of a financial transaction.

```typescript
const BPS_BASE = 10000;
```