Overview
To authenticate with CoinMarketCal, you need:- API Key — a CoinMarketCal API key.
Prerequisites
- A CoinMarketCal developer account. The Free plan includes API access and needs no credit card; sign up here.
Step 1: Copy your API key
- Sign in to the CoinMarketCal developer dashboard.
- In the left sidebar, open API keys. The Free plan comes with one key, created when you sign up. On a paid plan, you can click + New API key to create another.
- Click Copy (or Reveal) on the key row to get the full key, which starts with
cmc_live_.

Step 2: Enter your API key in the Connect UI
- Open the form where you need to authenticate with CoinMarketCal.
- Enter your API Key in the designated field.
- Click Connect.
