The issue is now resolved. All API authentication should be back to normal status.
Posted Sep 01, 2021 - 18:24 UTC
Identified
If you are continuing to have key validation issues (1020 or 403 errors), as a temporary workaround, please ensure that all requests to our API include a user agent string. Our engineers are continuing to work on the underlying cause for this error.
Posted Sep 01, 2021 - 17:54 UTC
Investigating
There are currently key authentication issues that may result in 403 and 1020 errors when accessing the API. The engineering team is investigating and we will be posting updates here, as soon as we have them.
Posted Sep 01, 2021 - 16:31 UTC
This incident affected: CoinMarketCap API (CoinMarketCap API - pro-api.coinmarketcap.com).