Feature

gRPC

High-performance binary RPC over HTTP/2.

15 providers 49 APIs 14 declared variants

The API exposes gRPC services with protobuf contracts and HTTP/2 transport. Chosen for low-latency, high-throughput, strongly typed service-to-service communication.

15 API providers on the APIs.io network offer grpc. The highest-rated are NVIDIA NIM, Celestia, Aptos, Google Quantum AI, Ballerina.

Providers

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Exemplar 1 Complete, well-documented, and agent-ready
NVIDIA NIMNVIDIA NIM (NVIDIA Inference Microservices) is a catalog of GPU-accelerated, containerized AI inference mic...3 APIs68.3
Strong 3 Solid coverage with minor gaps
CelestiaCelestia is the first production modular data availability blockchain. It separates consensus and data avai...10 APIs62.6AptosAptos is a Move-based Layer 1 blockchain platform that exposes a REST API for reading on-chain state and su...1 API58.8Google Quantum AIGoogle Quantum AI is Google's quantum-computing research and engineering arm, building superconducting quan...1 API57.3
Developing 8 Usable, with meaningful gaps to close
BallerinaBallerina is an open-source programming language for the cloud, created and maintained by WSO2, whose type ...1 API53.6GrafanaGrafana Labs builds the open and composable observability stack used by millions of engineers to visualize,...20 APIs52.3WeaviateWeaviate is an open-source, AI-native vector database that enables developers to build semantic search and ...1 API48.3Triton OneTriton One is a high-performance Solana RPC and blockchain infrastructure provider operating globally distr...3 APIs47.9NGINXNGINX is a high-performance open-source web server, reverse proxy, and API gateway widely used for load bal...1 API46.9Jito LabsJito Labs is the Solana MEV infrastructure company behind Jito-Solana, the MEV-enabled validator client tha...2 APIs46.0Apache DubboApache Dubbo is a high-performance, Java-based open-source RPC framework that provides service discovery, t...1 API44.0Apache TomcatApache Tomcat is an open-source implementation of the Java Servlet, JavaServer Pages (JSP), Java Expression...1 API40.6
Thin 1 Limited public surface area
CrestaCresta (legally Cresta Intelligence, Inc.) is a Palo Alto, California enterprise Customer Experience AI com...1 API30.1
Emerging 1 Early or largely undocumented
Varnish CacheVarnish Cache is a high-performance HTTP accelerator and reverse proxy designed for content-heavy dynamic w...3 APIs20.2
Minimal 1 Almost no public developer surface
Binary FormatBinary format refers to data encoding and serialization methods that use binary rather than text representa...8.2

What Providers Actually Declared

This feature is a canonical term. These are the free-text strings providers wrote in their own apis.yml that map onto it.

Grafana Synthetic Monitoring — global probe network for HTTP, DNS, TCP, ICMP, scripted browser, gRPCHTTP/2 SupportLive production API host at api.cresta.com — a gRPC-JSON transcoding gateway, confirmed by anonymous probeNVIDIA Riva speech NIMs (Parakeet ASR, Canary translation, Magpie TTS) with HTTP and gRPC adaptersProtocol Buffers (protobuf)Quantum Engine REST/gRPC API (quantum.googleapis.com, v1alpha1) for program, job, processor, reservation, and calibration managementREST, GraphQL, and gRPC APIsShredStream gRPC service for sub-slot Solana shred delivery to bots, dApps, and validatorsTriple Protocol (gRPC Compatible)Yellowstone Dragon's Mouth gRPC streaming for slots/blocks/transactions/accounts/blockmetacelestia-app exposes Cosmos SDK gRPC (:9090), REST (:1317), and CometBFT RPC (:26657) for consensus-level queriesgRPC APIgRPC ProxyinggRPC transaction streaming

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Every feature here is available over the APIs.io API and to AI agents over MCP. Features is not yet its own endpoint on the v1 API. Reach it through catalog search and the tag graph, or the MCP server.

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Tools for features

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  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
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