# gRPC

**Canonical:** https://apis.io/providers/grpc/  
**Website:** https://grpc.io/  
**APIs profiled:** 7

gRPC is a high-performance, open-source universal RPC framework that uses HTTP/2 for transport, Protocol Buffers as the interface description language, and provides features such as authentication, bidirectional streaming and flow control, blocking or nonblocking bindings, and cancellation and timeouts. Originally developed at Google, it is now a CNCF project.

## Kin Score — 37.6 / 100 (thin)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 37.6).

| Facet | Score |
|---|---|
| Discoverability | 64.8 |
| Contract Quality | 61.3 |
| Governance | 9.8 |
| Contract Governance | 9.8 |
| Operational Transparency | 36.8 |
| Developer Ergonomics | 33.3 |
| Commercial Clarity | 15.8 |
| Access Clarity | 15.8 |

## Agent readiness — 23.5 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | yes |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Freemium — onboarding: unknown, pricing: freemium, trial: no (confidence: medium).

## APIs (7)

- **gRPC Core Framework** — The gRPC core framework defines the RPC protocol, service definition format using Protocol Buffers, and the fundamental call lifecycle including unary, server-streaming, client-...
- **Protocol Buffers Service Definition Schema** — JSON Schema for Protocol Buffers service definition format (.proto files). Describes the structure of gRPC service declarations, RPC methods, message types, enums, oneofs, maps,...
- **gRPC Health Checking Service** — The gRPC Health Checking Protocol defines a standard service that gRPC servers implement to expose health status information to clients and load balancers. Servers implement the...
- **gRPC Server Reflection** — The gRPC Server Reflection Protocol allows gRPC servers to declare the protobuf-defined APIs they export over a standardized RPC service, including all types referenced by reque...
- **gRPC Channelz API** — Channelz service for runtime introspection of gRPC channels, subchannels, servers, and sockets.
- **gRPC Health Checking API** — gRPC Health Checking Protocol endpoints for monitoring service availability and readiness.
- **gRPC Reflection API** — Server Reflection service for runtime discovery of available gRPC services and their definitions.

## Security (1)

- **Grpc Domain Security** — TLSv1.3 · HSTS · DMARC

## Plans (1)

- **Grpc Plans Pricing**

## Tags

CNCF, HTTP/2, Microservices, Protocol Buffers, RPC

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/grpc/). Scores are computed from the provider's own public artifacts under a published rubric.