gRPC

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.

gRPC publishes 5 APIs on the APIs.io network, including Health Checking Service, Server Reflection, Channelz API, and 2 more. Tagged areas include CNCF, HTTP/2, Microservices, Protocol Buffers, and RPC.

The gRPC catalog on APIs.io includes 1 Spectral governance ruleset.

gRPC’s developer surface includes documentation, getting-started guide, engineering blog, FAQ, changelog, and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub

50.7/100 developing ▬ flat Agent 25/100 agent aware Full breakdown ↓
scored 2026-07-28 · rubric v0.6

AccessFreemium

7 APIs

CNCFHTTP/2MicroservicesProtocol BuffersRPC

Kin Score

Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6

Composite quality — 50.7/100 · developing

Contract Quality 15.9 / 25

Developer Ergonomics 6.5 / 20

Commercial Clarity 7.9 / 20

Operational Transparency 6.8 / 13

Governance 7.0 / 12

Discoverability 6.5 / 10

Agent readiness — 25/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/grpc: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 7

Individual APIs this provider publishes, each with its own machine-readable definition.

Rate Limits 1

Documented rate limits and quota policies.

Grpc Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

Documentation 4

Reference material describing how the API behaves

Documentation

JSONSchema

JSONSchema

AsyncAPI

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

JSONLD

JSONLD

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

SDKs

SDKs

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 3

Status, limits, changes, and where to get help

Community

Community

FAQ

FAQ

ChangeLog

ChangeLog

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: grpc
name: gRPC
description: 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.
url: https://raw.githubusercontent.com/api-evangelist/grpc/refs/heads/main/apis.yml
type: Index
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/grpc.png
tags:
- CNCF
- HTTP/2
- Microservices
- Protocol Buffers
- RPC
created: '2025'
modified: '2026-04-28'
specificationVersion: '0.19'
apis:
- aid: grpc:grpc-core
  name: gRPC Core Framework
  description: The gRPC core framework defines the RPC protocol, service definition format using Protocol Buffers, and the
    fundamental call lifecycle including unary, server-streaming, client-streaming, and bidirectional streaming patterns over
    HTTP/2. It is the foundational specification implemented by all language-specific gRPC SDKs.
  humanURL: https://grpc.io/docs/what-is-grpc/introduction/
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  properties:
  - type: Documentation
    url: https://grpc.io/docs/what-is-grpc/introduction/
  - type: Reference
    url: https://grpc.io/docs/what-is-grpc/core-concepts/
  - type: Authentication
    url: https://grpc.io/docs/guides/auth/
  - type: GitHubRepository
    url: https://github.com/grpc/grpc
  - type: JSONSchema
    url: service-config-schema.json
  - type: JSONSchema
    url: json-schema.yml
  - type: JSONLD
    url: context.jsonld
  tags:
  - HTTP/2
  - Protocol Buffers
  - RPC
  - Streaming
- aid: grpc:protobuf-service-definition
  name: Protocol Buffers Service Definition Schema
  description: JSON Schema for Protocol Buffers service definition format (.proto files). Describes the structure of gRPC
    service declarations, RPC methods, message types, enums, oneofs, maps, and file-level options used to define gRPC APIs.
  humanURL: https://protobuf.dev/programming-guides/proto3/
  tags:
  - IDL
  - Protocol Buffers
  - Schema
  - Service Definition
  properties:
  - type: Documentation
    url: https://protobuf.dev/programming-guides/proto3/
  - type: JSONSchema
    url: json-schema/protobuf-service-definition.yml
- aid: grpc:grpc-health-checking
  name: gRPC Health Checking Service
  description: 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 Health service proto to report per-service readiness,
    and clients can configure automatic health-check-based connection management.
  humanURL: https://grpc.io/docs/guides/health-checking/
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  properties:
  - type: Documentation
    url: https://grpc.io/docs/guides/health-checking/
  - type: Reference
    url: https://github.com/grpc/grpc-proto/blob/master/grpc/health/v1/health.proto
  - type: GitHubRepository
    url: https://github.com/grpc/grpc-proto
  - type: AsyncAPI
    url: asyncapi.yml
  tags:
  - Health Checking
  - Load Balancing
  - Observability
- aid: grpc:grpc-server-reflection
  name: gRPC Server Reflection
  description: 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 request and response messages. This enables command-line
    debugging tools and clients to dynamically discover and invoke gRPC services without pre-compiled stubs.
  humanURL: https://grpc.io/docs/guides/reflection/
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  properties:
  - type: Documentation
    url: https://grpc.io/docs/guides/reflection/
  - type: Reference
    url: https://github.com/grpc/grpc/blob/master/doc/server-reflection.md
  - type: AsyncAPI
    url: asyncapi.yml
  tags:
  - Debugging
  - Reflection
  - Service Discovery
- aid: grpc:grpc-channelz-api
  name: gRPC Channelz API
  description: Channelz service for runtime introspection of gRPC channels, subchannels, servers, and sockets.
  humanURL: https://grpc.io/docs/platforms/web/
  tags:
  - Channelz
  properties:
  - type: OpenAPI
    url: openapi/grpc-channelz-api-openapi.yml
  - type: Documentation
    url: https://grpc.io/docs/platforms/web/
  - type: Reference
    url: https://grpc.io/docs/platforms/web/basics/
  - type: JSONSchema
    url: json-schema.yml
- aid: grpc:grpc-health-checking-api
  name: gRPC Health Checking API
  description: gRPC Health Checking Protocol endpoints for monitoring service availability and readiness.
  humanURL: https://grpc.io/docs/platforms/web/
  tags:
  - Health Checking
  properties:
  - type: OpenAPI
    url: openapi/grpc-health-checking-api-openapi.yml
  - type: Documentation
    url: https://grpc.io/docs/platforms/web/
  - type: Reference
    url: https://grpc.io/docs/platforms/web/basics/
  - type: JSONSchema
    url: json-schema.yml
- aid: grpc:grpc-reflection-api
  name: gRPC Reflection API
  description: Server Reflection service for runtime discovery of available gRPC services and their definitions.
  humanURL: https://grpc.io/docs/platforms/web/
  tags:
  - Reflection
  properties:
  - type: OpenAPI
    url: openapi/grpc-reflection-api-openapi.yml
  - type: Documentation
    url: https://grpc.io/docs/platforms/web/
  - type: Reference
    url: https://grpc.io/docs/platforms/web/basics/
  - type: JSONSchema
    url: json-schema.yml
common:
- type: DomainSecurity
  url: security/grpc-domain-security.yml
- type: Website
  url: https://grpc.io/
- type: Documentation
  url: https://grpc.io/docs/
- type: GettingStarted
  url: https://grpc.io/docs/languages/
- type: GitHubOrganization
  url: https://github.com/grpc
- type: Blog
  url: https://grpc.io/blog/
- type: Community
  url: https://grpc.io/community/
- type: FAQ
  url: https://grpc.io/docs/what-is-grpc/faq/
- type: SDKs
  url: https://grpc.io/docs/languages/
- type: ChangeLog
  url: https://github.com/grpc/grpc/releases
- type: JSONSchema
  url: json-schema.yml
- type: JSONSchema
  url: service-config-schema.json
- type: AsyncAPI
  url: asyncapi.yml
- type: JSONLD
  url: context.jsonld
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

gRPC

Kin Score

APIs 7

gRPC Core Framework

Protocol Buffers Service Definition Schema

gRPC Health Checking Service

gRPC Server Reflection

gRPC Channelz API

gRPC Health Checking API

gRPC Reflection API

Pricing Plans 1

Grpc Plans Pricing

Rate Limits 1

Grpc Rate Limits

FinOps 1

Grpc Finops

Spectral Rules 1

gRPC API Rules

Security Posture 1

Grpc Domain Security

Resources