Protobuf
Providers using this tag (29)
Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.
Strong 1 Solid coverage with minor gaps
Developing 8 Usable, with meaningful gaps to close
Thin 12 Limited public surface area
Emerging 8 Early or largely undocumented
APIs with this tag (23)
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 7 Usable, with meaningful gaps to close
Antimetal Agent APIs (Protobuf)Public protobuf/Connect definitions for the Antimetal system agent — the component that connects customer i...Picarro Edge — SAM FOUP gRPC APIThe first-party gRPC/ProtoBuf interface Picarro publishes for external access to Picarro SAM (semiconductor...Picarro Platform Server APIThe gRPC interface to the host computer underneath a Picarro SAM deployment. `platformserver` exposes NetCo...bitdrift Public APIThe bitdrift Capture public API — schema-first protobuf service definitions exposed over gRPC, Connect, and...KurrentDB gRPC APIThe primary protocol for KurrentDB. The published protocol buffer definitions cover the v2 streams service ...LinQ Wallet Public APIgRPC / Protocol Buffers API for integrating a game with LinQ Wallet services. Covers geo restriction checks...Sui gRPC APIThe Sui full-node gRPC API (Protobuf, sui.rpc.v2) exposing LedgerService, StateService, TransactionExecutio...
Thin 10 Limited public surface area
Confluent Schema Registry REST APIThe Schema Registry REST API stores and serves Avro, JSON Schema, and Protobuf schemas with versioning and ...Envoy API V3The Envoy API v3 is the current stable protobuf-based configuration and extension API for Envoy proxy. It d...Proemion CANlink mobile 10000 APIIntegrate the CANlink mobile 10000 telematics control unit with other platforms over an HTTPS/WebSocket pro...FernFern transforms a single API source of truth (OpenAPI, AsyncAPI, Protobuf, OpenRPC, or the Fern Definition ...Akka gRPCAkka gRPC provides support for building streaming gRPC servers and clients on top of Akka Streams, with cod...Code Protobuf APIThe Code payments gRPC/Protobuf API — account, currency, messaging, and transaction (intent/swap) services ...Redpanda Schema Registry APIThe Redpanda Schema Registry API is a Confluent-Schema-Registry-compatible REST API for managing Avro, JSON...LiveKit Signaling Protocol (WebSocket)Bi-directional WebSocket signaling protocol used by LiveKit clients to coordinate WebRTC sessions with the ...Bitquery Kafka StreamsProtobuf-encoded streams of decoded blockchain data delivered via managed Kafka topics. Designed for scale-...Apicurio RegistryApicurio Registry is a high-performance, runtime registry for schemas and API designs. It stores and manage...
Emerging 6 Early or largely undocumented
Sozu Command APIThe Sozu Command API provides programmatic control of the Sōzu HTTP reverse proxy at runtime. External tool...Helium Protobuf DefinitionsCanonical protocol buffer definitions for Helium message formats used across packet routing, oracles, and r...Protocol BuffersProtocol Buffers (Protobuf) is Google's language-neutral, platform-neutral, extensible mechanism for serial...Retrofit ConvertersPluggable serialization converters for Retrofit supporting Gson, Moshi, Jackson, Kotlinx Serialization, JAX...gRPC and Protocol BuffersgRPC is a high-performance RPC framework using HTTP/2 and Protocol Buffers (Protobuf) as its IDL and wire f...Apicurio RegistryRed Hat's open-source API/schema registry that stores and validates OpenAPI, AsyncAPI, JSON Schema, Avro, P...
Score breakdown
Frequency
40.1
log-scaled weighted occurrences
Breadth
0.8
spread across providers
Quality lift
42.2
mean composite of providers using it
Cohesion
11.5
strength of nearest seed neighbor
Related tags
Schema Registry 6 co-occurrences
Avro 5 co-occurrences
gRPC 16 co-occurrences
JSON-Schema 5 co-occurrences
AsyncAPI 5 co-occurrences
Streaming 5 co-occurrences
SDK 6 co-occurrences
Open-Source 9 co-occurrences
Where this tag comes from
Api tag24
Provider tag8
Cohort brief
Auto-generatedThe 29 providers in the APIs.io catalog tagged Protobuf, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.
Providers
29
all scored
Mean Kin Score
34.5
+13.8 vs catalog 20.7
Mean Agent Readiness
19.5
+9.8 vs catalog 9.7
Spread
14.4–54.5
median 35.7 · σ 11.9
How the 29 split by band
Exemplar 0Strong 1Developing 8Thin 12Emerging 8Minimal 0
Facet averages, against the whole catalog
| Facet | This cohort | Catalog | Difference | Scored |
|---|---|---|---|---|
| Developer Ergonomics | 37.1 | 17.9 | +19.2 | 29 |
| Contract Quality | 36.1 | 17.5 | +18.6 | 29 |
| Operational Transparency | 26.4 | 11.3 | +15.1 | 29 |
| Discoverability | 73.1 | 60.4 | +12.7 | 29 |
| Contract Governance | 14 | 6.4 | +7.6 | 29 |
| Access Clarity | 26.5 | 22.3 | +4.2 | 29 |
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) | 38% | 16% | +22 |
| MCP server (first-party) | 10% | 7% | +3 |
| Agent Skills | 0% | 0% | 0 |
| OAuth scopes | 17% | 9% | +8 |
| Security | 93% | 88% | +5 |
| Arazzo workflows | 0% | 2% | -2 |
| Governance rules | 41% | 13% | +28 |
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 Engine 54.5
- 2 Antimetal 52.7
- 3 Picarro 50.4
- 4 bitdrift 49.8
- 5 Kurrent 48.9
- 6 Rubicon Project 48.6
- 7 Bear Robotics 47.2
- 8 Linq.gg 44.3
- 9 Mysten Labs 44.1
- 10 Confluent | the Data Streaming Platform 38.2
Top by Agent Readiness
- 1 Antimetal 55.8
- 2 Kurrent 45.5
- 3 Mysten Labs 34.5
- 4 Picarro 32.9
- 5 Rubicon Project 29
- 6 Code 26.8
- 7 Confluent Schema Registry 26.6
- 8 Apicurio 25.5
- 9 Envoy 25.5
- 10 Bear Robotics 25.4
All 29 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.
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