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Hasura
Blazing fast, instant realtime GraphQL APIs on your DB with fine grained access control, also trigger webhooks on database events.
My most recent job used Hasura on top of all of our microservices to turn them all into graphql endpoints. We then had an api gateway with Hasura as well that imported the schemas from all of the microservices - effectively combining all of the backend schemas into a single one that was used by the frontend. If any business logic was required between services then we just used REST endpoints for that.
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InfluxDB
Purpose built for real-time analytics at any scale. InfluxDB Platform is powered by columnar analytics, optimized for cost-efficient storage, and built with open data standards.
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graphql-mesh
🕸️ GraphQL Federation Framework for any API services such as REST, OpenAPI, Swagger, SOAP, gRPC and more...
You might be able to integrate existing API's with https://www.graphql-mesh.com/ but keep in mind this will add latency and you won't get all the full benefits of implementing native graphql services.