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Iago SilvaIago Silva 

Standard REST API for custom metadata (__mdt) records

Is there a way to update a custom metadata record using standard REST API?
VinayVinay (Salesforce Developers) 
Hi Iago,

Custom Metadata Type records cannot be created or updated through REST and SOAP APIs.  CMT records are metadata and must be manipulated using the Metadata API.

https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_class_Metadata_Operations.htm#apex_class_Metadata_Operations
https://andyinthecloud.com/2017/08/29/introducing-custom-metadata-services/

Please mark as Best Answer if above information was helpful.

Thanks,