Protocol Buffers
Providers using this tag (25)
Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.
Developing 5 Usable, with meaningful gaps to close
Thin 6 Limited public surface area
Emerging 13 Early or largely undocumented
Minimal 1 Almost no public developer surface
APIs with this tag (21)
Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →
Developing 4 Usable, with meaningful gaps to close
Agent Directory (DIR)Distributed announce and discovery of multi-agent systems. gRPC-first, with services for storage (content-a...AimDK Protocol (Link-U OS Robot Interface)The AimDK protocol is AgiBot's first-party Protocol Buffers definition of its robots' interfaces, published...ClickHouse gRPC InterfacegRPC interface defined by clickhouse_grpc.proto for efficient binary communication.Cerbos PDP gRPC APIThe Cerbos PDP gRPC API exposes the cerbos.svc.v1.CerbosService and related management services on port 359...
Thin 6 Limited public surface area
gRPC Core FrameworkThe gRPC core framework defines the RPC protocol, service definition format using Protocol Buffers, and the...Protocol Buffers Service Definition SchemaJSON Schema for Protocol Buffers service definition format (.proto files). Describes the structure of gRPC ...Prometheus Remote WriteRemote Write is Prometheus' push protocol for shipping scraped samples to long-term storage and analysis ba...gRPC Reflection APIgRPC server reflection provides information about publicly-accessible gRPC services on a server, enabling d...Vert.x gRPCA Vert.x-native gRPC implementation providing a reactive, non-blocking gRPC client and server built on top ...BandChain gRPC APIThe BandChain gRPC API provides high-performance protocol buffer access to BandChain nodes for querying ora...
Emerging 11 Early or largely undocumented
Riak Protocol Buffers Client APIHigher-performance binary client API for Riak KV using Protocol Buffers messages encoded over a long-lived ...Buf CLIThe Buf CLI is a local Protobuf development toolchain providing linting, breaking change detection, code ge...Buf Schema Registry (BSR)The Buf Schema Registry (BSR) is a centralized repository for managing, distributing, and documenting Proto...BufstreamBufstream is a Kafka-compatible streaming platform built on Protocol Buffers. It provides schema enforcemen...KratosKratos is a Go framework for building cloud-native microservices, originally created at Bilibili. It provid...TypeSpec Protobuf EmitterEmits Protocol Buffer `.proto` files from TypeSpec service definitions, enabling gRPC service generation fr...Apache SkyWalking gRPC Data Collect ProtocolThe SkyWalking data collection protocol defines gRPC service definitions for telemetry data ingestion from ...KitexKitex is a high-performance, extensible RPC framework for building microservices in Go, developed by ByteDa...Protocol BuffersProtocol Buffers (Protobuf) is Google's language-neutral, platform-neutral, extensible mechanism for serial...Twirp RPC FrameworkTwirp is a simple RPC framework with protobuf service definitions. Define your service in a .proto file and...gRPC and Protocol BuffersgRPC is a high-performance RPC framework using HTTP/2 and Protocol Buffers (Protobuf) as its IDL and wire f...
Score breakdown
Frequency
42.3
log-scaled weighted occurrences
Breadth
0.7
spread across providers
Quality lift
32.8
mean composite of providers using it
Cohesion
11.8
strength of nearest seed neighbor
Related tags
gRPC 16 co-occurrences
RPC 6 co-occurrences
Code Generation 6 co-occurrences
HTTP 6 co-occurrences
Microservices 5 co-occurrences
Observability 7 co-occurrences
Streaming 7 co-occurrences
Open-Source 12 co-occurrences
Where this tag comes from
Provider tag16
Api tag21
Cohort brief
Auto-generatedThe 25 providers in the APIs.io catalog tagged Protocol Buffers, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.
Providers
25
all scored
Mean Kin Score
27.3
+6.6 vs catalog 20.7
Mean Agent Readiness
11.2
+1.5 vs catalog 9.7
Spread
8.2–47.6
median 23.5 · σ 11
How the 25 split by band
Exemplar 0Strong 0Developing 5Thin 6Emerging 13Minimal 1
Facet averages, against the whole catalog
| Facet | This cohort | Catalog | Difference | Scored |
|---|---|---|---|---|
| Developer Ergonomics | 32 | 17.9 | +14.1 | 25 |
| Operational Transparency | 21.3 | 11.3 | +10 | 25 |
| Contract Quality | 24.2 | 17.5 | +6.7 | 25 |
| Discoverability | 66 | 60.4 | +5.6 | 25 |
| Contract Governance | 10.4 | 6.4 | +4 | 25 |
| Access Clarity | 21.4 | 22.3 | -0.9 | 25 |
A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.
What this cohort publishes
| Artifact | This cohort | Catalog | Difference |
|---|---|---|---|
| MCP server (any) | 24% | 16% | +8 |
| MCP server (first-party) | 8% | 7% | +1 |
| Agent Skills | 0% | 0% | 0 |
| OAuth scopes | 4% | 9% | -5 |
| Security | 92% | 88% | +4 |
| Arazzo workflows | 0% | 2% | -2 |
| Governance rules | 44% | 13% | +31 |
mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.
Top by Kin Score
- 1 AGNTCY 47.6
- 2 AgiBot 44
- 3 EngFlow 43.3
- 4 ClickHouse 41
- 5 Cerbos 40
- 6 Aalyria 37.2
- 7 gRPC 37.2
- 8 Prometheus 37.1
- 9 Scalable Services 32.7
- 10 Vert.x 31.4
Top by Agent Readiness
- 1 AgiBot 43.2
- 2 AGNTCY 34.2
- 3 Cerbos 23.4
- 4 Scalable Services 21
- 5 ClickHouse 20.9
- 6 gRPC 19.8
- 7 Prometheus 19.8
- 8 Aalyria 19.2
- 9 Riak KV 17.3
- 10 EngFlow 16.4
All 25 members of this roster resolve to a scored provider in
the catalog.Generated from the catalog build of
25 August 2026, across 26891
providers, using the same computation served by the
APIs.io cohort API. Briefs are published for rosters of
5 or more scored providers; below that a distribution is not meaningful.
Work with this as data
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find_tagsBrowse and filter every tag in the catalog.get_cohortThis tag as a scored cohort — every provider carrying it, with scores.cohort_statsPRO — the distribution across this tag: mean, median, band split, adoption rates.cohort_rankingsPRO — the leaderboard, on composite AND agent-readiness axes.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.
Call it yourself
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curl "https://apis.io/api/v1/tags/protocol-buffers"
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As a scored cohort
curl "https://apis.io/api/v1/cohorts/tag/protocol-buffers"
The distribution (Pro)
curl "https://apis.io/api/v1/cohorts/tag/protocol-buffers/stats" \
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