Authentication - Cryptorank API v3

All v3 requests authenticate with a single header.

Header	Type	Description
`X-Api-Key`	string · required	Your 60-character hex API key. Generate it in the dashboard.

curl https://api.cryptorank.io/v3/currencies/map \
  -H "X-Api-Key: YOUR_API_KEY"

Key facts

Keys are shared with v2 — an existing v2 key works on v3.
Credits are per user (shared across all of your keys); rate limit (RPM) is per key.

Auth failures return 401 (API_KEY_MISSING / API_KEY_INVALID) or 403 NO_ACTIVE_SUBSCRIPTION. See Errors for the full list.