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 14 more developer resources.

🌐 Visit website 📡 Source on GitHub

45.7/100 developing ▬ flat Agent 22/100 agent aware self hosted · Apache-2.0 Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreemium

1 APIs

CNCF HTTP/2 Microservices Protocol Buffers RPC

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 45.7/100 · developing

Contract Quality 12.0 / 20

Developer Ergonomics 8.4 / 16

Access Clarity 2.5 / 16

Operational Transparency 3.8 / 10

Contract Governance 0.9 / 10

Discoverability 4.7 / 8

Open Source Surface 10.0 / 10

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 22/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 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

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Open Source Surface applies to this provider. This product is open source and we read its repository directly, so Open Source Surface carries 10 points of the composite. It is scored from what the repository actually publishes — a security policy, a contribution guide, a release history, a code of conduct — read live from the provider rather than inferred from our own catalog pointers. This facet adds; nothing was taken away to make room for it. An open-source project is not excused from the commercial facets, because exemption would strip it of the points it does earn. If we have the wrong repository, or this product is not open source, say so on your provider repo and we will drop the facet rather than have you publish against it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 80 points between them, because the conditional facet above carries the other 20. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 80% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. 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. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 7

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

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.

Scroll for all 7

Open Collections 4

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

gRPC-Web Proxy Channelz API

OPEN COLLECTION

gRPC-Web Proxy Health Checking API

OPEN COLLECTION

gRPC-Web Proxy Reflection API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Grpc Plans Pricing

3 plans

PLANS

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.

Grpc Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

gRPC API Rules

6 rules · 5 warnings 1 info

SPECTRAL

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Grpc Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

Documentation 5

Reference material describing how the API behaves

ContributionGuide

Documentation

JSONSchema

JSONSchema

AsyncAPI

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

JSONLD

JSONLD

Build 3

SDKs, sample code, and the tooling you integrate with

CodeOfConduct

CodeOfConduct

GitHubOrganization

GitHubOrganization

SDKs

SDKs

Access & Security 2

Authentication, authorization, and security posture

SecurityPolicy

SecurityPolicy

DomainSecurity

DomainSecurity

Operate 4

Status, limits, changes, and where to get help

IssueTracker

Community

FAQ

ChangeLog

Commercial 1

Pricing, plans, and the legal terms of use

License

License

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
deliveryModel:
  model: self-hosted
  license: Apache-2.0
  open_source: true
  commercial: false
  callable_host: false
  label: Self-hosted open source · you run it yourself
  confidence: high
  source:
  - license
  - openapi
  generated: '2026-08-28'
  method: derived
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: '0.23'
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: IssueTracker
  url: https://github.com/grpc/grpc/issues
- type: SecurityPolicy
  url: https://github.com/grpc/grpc/blob/master/SECURITY.md
- type: CodeOfConduct
  url: https://github.com/grpc/grpc/blob/master/CODE-OF-CONDUCT.md
- type: ContributionGuide
  url: https://github.com/grpc/grpc/blob/master/CONTRIBUTING.md
- type: License
  name: Apache-2.0
  url: https://github.com/grpc/grpc/blob/master/LICENSE
- 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

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