# Get Altcoin Index

Retrieves the altcoin index calculated by comparing the percentage change of top altcoins to Bitcoin's percentage change over the last 90 days.
The index represents the count of altcoins outperforming Bitcoin.

Endpoint: GET /marketdata/altcoin_index
Version: 1.0.0
Security: ApiKeyAuth

## Response 200 fields (application/json):

  - `altcoinIndex` (integer)
    Example: 28


## Response 500 fields