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

# Add cosigner

> Add a new cosigner. The cosigner will be pending pairing until the API key is manually paired
Endpoint Permission: Admin and Non-Signing Admin.



## API Specification

The full API specification for this endpoint is available in the [documentation index](https://developers.fireblocks.com/llms.txt).