Before you can use the CMC API, you need to sign up for a (free) developer account, to receive an API key. You can sign up at pro.coinmarketcap.com and - after verifying your account - you can retrieve your API key. Source: over 2 years ago
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This is an informative page about CoinMarketCap API. You can review and discuss the product here. The primary details have not been verified within the last quarter, and they might be outdated. If you think we are missing something, please use the means on this page to comment or suggest changes. All reviews and comments are highly encouranged and appreciated as they help everyone in the community to make an informed choice. Please always be kind and objective when evaluating a product and sharing your opinion.