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 →

Exemplar 2 Complete, well-documented, and agent-ready

Salesforce Pub/Sub APIThe Salesforce Pub/Sub API is a gRPC-based API for publishing and subscribing to platform events, change da...83.3 Nakama APIThe Nakama API is the core REST and WebSocket API for Heroic Labs' open-source game backend server. It prov...70.4

Strong 27 Solid coverage with minor gaps

Vendasta AI Employees APIAPI for the AI Employees (AI assistants) that Vendasta runs on a partner platform — receptionist, reputatio...63.3 Vendasta AI Knowledge APIThe knowledge (embeddings) API that grounds Vendasta AI Employees: upsert a knowledge source into an accoun...63.3 Vendasta Composer APIThe Composer service on the Vendasta gRPC gateway, used for composing content within the platform.63.3 Vendasta Conversation APIConversations AI service API for the unified inbox that centralises SMS, web chat, voice and other channels...63.3 Vendasta CRM API (gRPC gateway)The CRM surface exposed through the gRPC reverse-proxy gateway: CRMService, CRMAssociationService, CRMCompa...63.3 Vendasta Forms APIForms service API for creating and managing the forms a business publishes and the submissions they collect.63.3 Vendasta Listing Products APIListing Products services through the gRPC gateway: ListingProductsService, ListingSourceService, ListingPr...63.3 Vendasta Meetings APIMeetings (CalendarHero) API for creating meetings, adding contacts, messaging and searching. Scope-gated wi...63.3 Vendasta Multi-Location Analytics APIAnalytics service for multi-location brands and franchises, rolling product performance up across the locat...63.3 Vendasta Reputation API (gRPC gateway)The fuller Reputation surface through the gRPC gateway: ListingService, ReviewService and NetPromoterScoreS...63.3 Vendasta Sales Orders APISales Orders service and its auxiliary field schema, exposed through the gRPC gateway — the order surface b...63.3 Vendasta Social Drafts APISocial Drafts service for creating, listing and managing draft social content before it is scheduled or pub...63.3 Vendasta Social Posts APISocial Posts services: SocialPosts, SocialPostsV2, the WordPress plugin service and the blog posts service ...63.3 Vendasta Vanalytics APIThe VAnalytics service on the gRPC gateway, exposing Vendasta platform analytics data.63.3 Vendasta Website Pro Admin Center APIWebsite Pro admin center services — search and WordPress administration across the sites a partner manages.63.3 Vendasta Website Pro Monitor APIWebsite Pro monitoring service for uptime and health signals on managed WordPress sites.63.3 Vendasta Website Pro Site Info APIWebsite Pro site information and cache services for managed WordPress sites.63.3 Vendasta Website Pro Support Tools APIWebsite Pro SiteManager support tooling used to diagnose and operate managed WordPress sites.63.3 Vendasta Website Pro WP Manager APIWebsite Pro site options and PageSpeed services for managed WordPress sites.63.3 Vendasta WordPress Hosting APISite detail service for Vendasta managed WordPress hosting (Website Pro), which runs client WordPress sites...63.3 Temporal Server Frontend APIThe Temporal Server Frontend API provides gRPC services for interacting with the Temporal Server, including...59.5 Decart Oasis Action-to-Video (gRPC)A gRPC session protocol for Oasis 3 Preview, Decart's promptable real-time world model. A client initialize...57.6 Kaiko StreamReal-time crypto market data delivered over gRPC server-streaming. Feeds include tick-level trades, top-of-...57.5 Rigetti QCS Controller Service (gRPC)gRPC Controller service that executes encrypted Controller Jobs on a Rigetti QPU endpoint and returns measu...57.2 Rigetti QCS Translation Service (gRPC)gRPC Translation service that compiles native Quil programs into encrypted Controller Jobs for execution on...57.2 Aptos Transaction Stream APIgRPC streaming API that delivers historical and real-time transaction data from the Aptos blockchain. Used ...57.0 Telia ACE Audio Stream Forwarding APIBidirectional streaming gRPC service over HTTP/2 that forwards copies of the audio streams in Telia ACE con...55.2

Developing 31 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...52.7 Salesforce Pub/Sub APIgRPC-based API for publishing and subscribing to platform events, change data capture events, and custom ch...51.6 0G DA (Data Availability) gRPCgRPC surface for the 0G data-availability layer. The Disperser service accepts blobs asynchronously (Disper...51.2 Salesforce Pub/Sub APIgRPC-based API for publishing and subscribing to platform events, change data capture events, and real-time...51.1 Spectro Cloud grpc APIThe grpc API from Spectro Cloud — 1 operation(s) for grpc.51.1 Goldmane Flows APIGoldmane is the Calico flow aggregation and network-observability service introduced in Calico Open Source ...50.8 Picarro Edge — SAM FOUP gRPC APIThe first-party gRPC/ProtoBuf interface Picarro publishes for external access to Picarro SAM (semiconductor...50.4 Picarro Platform Server APIThe gRPC interface to the host computer underneath a Picarro SAM deployment. `platformserver` exposes NetCo...50.4 bitdrift Public APIThe bitdrift Capture public API — schema-first protobuf service definitions exposed over gRPC, Connect, and...49.8 Triton One Yellowstone gRPC (Dragon's Mouth)Dragon's Mouth — Triton's high-performance Solana streaming gRPC service. Subscribe to slots, blocks, trans...49.4 Arango Managed Platform (AMP) APIThe control-plane API of the Arango Managed Platform (formerly ArangoGraph Insights Platform / Oasis) — the...48.9 KurrentDB gRPC APIThe primary protocol for KurrentDB. The published protocol buffer definitions cover the v2 streams service ...48.9 Bazel Remote Execution APIBazel speaks the open Remote Execution API (REAPI), a gRPC protocol for content-addressable storage and dis...48.2 Agent Directory (DIR)Distributed announce and discovery of multi-agent systems. gRPC-first, with services for storage (content-a...47.6 Bear Base APIThe on-robot gRPC service for direct local control of a Bear robot, used where the cloud is not in the path...47.2 Starlink Local Device APISpaceX's officially supported local gRPC API on Starlink hardware, defined in protobuf and published verbat...46.3 Jito Block Engine Validator gRPCgRPC interface between Jito-Solana validators / relayers and the Block Engine — BlockEngineValidator with S...46.1 Jito Relayer gRPCRelayer gRPC service that sits in front of a Jito-Solana validator, exposing GetTpuConfigs and SubscribePac...46.1 Jito Searcher gRPC ServicegRPC SearcherService exposing SubscribeBundleResults, SendBundle, GetNextScheduledLeader, GetConnectedLeade...46.1 Jito Streaming SurfacesReal-time streaming surfaces from Jito infrastructure — the wss tip_stream for continuous bundle-tip percen...46.1 HappyCo API (Happy API)HappyCo's gRPC API for property inspections, reports, templates, accounts, users, partner account provision...45.2 LinQ Wallet Public APIgRPC / Protocol Buffers API for integrating a game with LinQ Wallet services. Covers geo restriction checks...44.3 Sui gRPC APIThe Sui full-node gRPC API (Protobuf, sui.rpc.v2) exposing LedgerService, StateService, TransactionExecutio...44.1 AimDK Protocol (Link-U OS Robot Interface)The AimDK protocol is AgiBot's first-party Protocol Buffers definition of its robots' interfaces, published...44.0 Contour ExtensionService APIKubernetes Custom Resource Definition for binding gRPC-based extension services to the Contour API. Extensi...43.1 Pocket Network Shannon Chain APICosmos SDK-based REST and gRPC API for interacting with the Pocket Network Shannon protocol chain. Provides...43.1 ClickHouse gRPC InterfacegRPC interface defined by clickhouse_grpc.proto for efficient binary communication.41.0 OpenTelemetry Protocol (OTLP) gRPC APIThe OTLP gRPC API defines Protocol Buffers service definitions for exporting traces, metrics, and logs over...40.3 Cerbos PDP gRPC APIThe Cerbos PDP gRPC API exposes the cerbos.svc.v1.CerbosService and related management services on port 359...40.0 Akash Chain Node (gRPC / REST / RPC)Direct access to the Akash Cosmos-SDK chain over gRPC, REST (LCD), and Tendermint RPC. Used to query state,...39.9 Rentberry Geocoder (gRPC)Open-source gRPC geocoding and timezone-lookup service Rentberry built and runs for its own property search...39.3

Thin 59 Limited public surface area

etcd gRPC APIThe etcd v3 API is a gRPC-based interface providing key-value operations (put, get, delete, range), watch s...39.1 QORTEX DTC APIThe QORTEX DTC API is the integration surface of Quanergy's detect-track-classify perception server. A gRPC...38.9 Seldon Inference APIThe Seldon Inference API provides REST and gRPC endpoints for serving machine learning model predictions at...38.6 QUODD Snap gRPC APIgRPC delivery of pricing snapshots (Snap) and ticker information (Ticker Info) for high-performance, low-ov...38.1 Envoy xDS APIsThe xDS (x Discovery Service) APIs provide dynamic configuration for Envoy proxies via a management server,...37.3 Spacetime Federation API (East-West Interface)The Federation API, or East-West Interface, allows peer networks to request and to supply network resources...37.2 Spacetime Northbound Interface (NBI)The Northbound Interface allows humans or applications to define and orchestrate a Spacetime network. It ca...37.2 Spacetime Southbound Interface (SBI / CDPI)The Southbound Interface, also called the Control to Data-plane Interface (CDPI), is the collection of gRPC...37.2 Spacetime Status APIThe Status API is a small operational gRPC service exposed by every Spacetime instance. GetVersion returns ...37.2 SPIRE Server APIThe SPIRE Server exposes a gRPC API used by administrators and the SPIRE Agent to manage registration entri...36.8 SPIRE Workload APIThe SPIRE Agent exposes the SPIFFE Workload API as a Unix domain socket, allowing workloads running on the ...36.8 Linkerd Proxy Control Plane APIThe Linkerd Proxy Control Plane gRPC API defines the protobuf service contracts used by the data-plane prox...36.3 CRI-O CRI gRPC APICRI-O implements the Kubernetes Container Runtime Interface (CRI) gRPC API that the kubelet uses to manage ...36.1 Hubble Relay APIThe Hubble Relay API is a gRPC service that aggregates and relays network flow data from multiple Hubble ag...36.1 FernFern transforms a single API source of truth (OpenAPI, AsyncAPI, Protobuf, OpenRPC, or the Fern Definition ...36.0 Akka gRPCAkka gRPC provides support for building streaming gRPC servers and clients on top of Akka Streams, with cod...35.7 OpenXBuild Real-Time Bidstream APIAn inverted API — OpenX is the caller. A partner implements an enrichment service that OpenX hosts as a con...35.5 Falco gRPC APIThe Falco gRPC API provided a streaming interface for consuming Falco alert outputs and querying version in...34.8 Code Protobuf APIThe Code payments gRPC/Protobuf API — account, currency, messaging, and transaction (intent/swap) services ...34.1 ImandraX APIThe ImandraX cloud-native automated reasoning engine, exposed as a protobuf-defined gRPC API. Services incl...33.9 Envoy Proxy External Authorization APIThe Envoy External Authorization API provides a gRPC or HTTP interface for delegating authorization decisio...33.7 Envoy Proxy External Processing APIThe Envoy External Processing API is a gRPC-based service that enables an external server to inspect and mo...33.7 Envoy Proxy gRPC Access Log Service APIThe Envoy gRPC Access Log Service (ALS) API provides a streaming gRPC interface for receiving access log en...33.7 Envoy Proxy Health Discovery Service APIThe Envoy Health Discovery Service (HDS) is a gRPC-based API that enables a management server to instruct E...33.7 Envoy Proxy Metrics Service APIThe Envoy Metrics Service API is a gRPC-based interface for streaming Envoy's statistics and metrics to a r...33.7 Envoy Proxy Rate Limit Service APIThe Envoy Rate Limit Service (RLS) is a gRPC-based API that allows Envoy to delegate rate limiting decision...33.7 Envoy Proxy Tap Service APIThe Envoy Tap Service API provides a mechanism for intercepting and recording HTTP and TCP traffic passing ...33.7 Towns ProtocolTowns Protocol is an open, decentralized messaging protocol built on Base. Builders integrate via first-par...33.1 Triton GRPC APIHigh-performance gRPC API for model inference with support for streaming and binary tensor data.33.1 TUM Campus App Backend APIREST and gRPC backend behind the official TUM Campus App. 19 operations across campus news and alerts, stud...33.0 QuickNode Core RPC APIMulti-chain JSON-RPC, REST, and gRPC endpoints across 77+ blockchains (Ethereum, Solana, Polygon, Arbitrum,...32.4 Bitquery Solana CoreCast (gRPC)gRPC streaming API for Solana that delivers decoded block, transaction, and instruction data with sub-secon...32.1 SPIFFE Workload APIThe SPIFFE Workload API is a gRPC streaming interface through which workloads request and receive SPIFFE Ve...32.0 Cassandra gRPC API (Stargate)High-performance gRPC API for Cassandra through Stargate, designed for low-latency service-to-service commu...31.8 Pixie APIPixie's gRPC API for programmatically running PxL scripts against live Kubernetes clusters and managing Pix...31.8 Helius LaserStreamLow-latency gRPC streaming of Solana account, slot, transaction, and block updates (Geyser-compatible).31.7 Thru gRPC APIHigh-performance proto3 gRPC API (with gRPC-Web for browsers) for the Thru blockchain. QueryService exposes...31.4 Vert.x gRPCA Vert.x-native gRPC implementation providing a reactive, non-blocking gRPC client and server built on top ...31.4 Vitess VTCtld APIVTCtld is the Vitess topology management daemon that exposes a gRPC and HTTP API for administrative operati...31.3 Vitess VTGate APIVTGate is the stateless proxy that routes queries to the appropriate VTTablet instances. It exposes a MySQL...31.3 Containerd gRPC APICore gRPC API for managing the full container lifecycle including containers, images, content, snapshots, n...30.9 Milvus gRPC APIgRPC is the canonical, high-throughput interface to Milvus. The official SDKs are gRPC-based; the REST API ...30.9 HYPERLABS Radium gRPC API (TDR11100)Public gRPC control and acquisition interface for the HYPERLABS TDR11100 Time Domain Reflectometer. The pro...30.8 Tailcall GraphQL RuntimeHigh-performance GraphQL runtime for composing multiple upstream REST, gRPC, and GraphQL APIs into a unifie...30.8 Cresta Platform APICresta's production API host. https://api.cresta.com resolves and answers anonymously with a gRPC-JSON tran...30.5 Harmonic Searcher API (gRPC)gRPC bundle-submission interface for searchers. Authenticate with a Solana keypair (challenge-response to B...30.0 Harmonic Validator API (gRPC)gRPC services the Harmonic validator clients (Salsa/Samba) use to bind to a block builder: subscribe to pac...30.0 XMTP Network gRPC APICore gRPC-based API for the XMTP decentralized messaging network. Provides operations for sending and retri...29.7 BandChain gRPC APIThe BandChain gRPC API provides high-performance protocol buffer access to BandChain nodes for querying ora...29.6 Mango OPI Storage Bridge gRPC APIMangoBoost ships an Open Programmable Infrastructure (OPI) gRPC bridge that translates standard OPI storage...29.6 Provenance Blockchain APIPublic Cosmos SDK REST (LCD / gRPC-gateway), gRPC, and Tendermint RPC interface to the Provenance Blockchai...29.6 PyBand Python SDKPyBand is a Python SDK that offers a comprehensive set of features for interacting with BandChain via gRPC....29.6 Jaeger Collector APIThe Jaeger Collector API receives trace spans from instrumented applications and SDKs. Since Jaeger v1.11 t...28.8 Jaeger Remote Sampling APIThe Jaeger Remote Sampling API provides HTTP and gRPC endpoints that SDKs use to retrieve sampling strategi...28.8 Jaeger Remote Storage APIThe Jaeger Remote Storage API is a gRPC-based interface that allows extending Jaeger with custom storage ba...28.8 HARIX Robot Skill API (gRPC)The gRPC surface a HARIX skill application uses to drive a CloudMinds cloud robot and to consume HARIX clou...26.8 FirehoseOpen-source flat-file extraction layer that powers Substreams. Provides chain-specific gRPC streams of bloc...26.7 The Graph SubstreamsgRPC streaming protocol for parallelized blockchain dataflows backed by Firehose. Substreams power high-thr...26.7 StellarStation APIPublic gRPC API for the StellarStation ground-station-as-a-service platform. Lets satellite operators list ...26.6

Emerging 33 Early or largely undocumented

Pachyderm gRPC APIPachyderm's platform API, exposed over gRPC/protobuf. Core services are PFS (data versioning — repos, commi...25.8 PyAnsysOpen-source Python ecosystem for Ansys products. The pyansys metapackage bundles 45+ libraries including Py...25.5 Bruno API ClientBruno is an open-source API client for exploring and testing REST, GraphQL, and gRPC APIs. Collections are ...25.3 Tekton Results APITekton Results provides a long-term store and a gRPC + REST API for completed PipelineRun/TaskRun records a...25.2 Kestrel Kubernetes OperatorThe Kestrel Kubernetes Operator is an open-source Go-based operator that connects Kubernetes clusters to th...24.9 Nuance Mix ASRaaS gRPC APIAutomatic Speech Recognition as a Service — convert speech to text in real time over a gRPC streaming API (...24.9 Nuance Mix DLGaaS gRPC APIDialog as a Service — execute conversational dialog flows authored in Mix.dialog over a gRPC Dialog service.24.9 Nuance Mix NLUaaS gRPC APINatural Language Understanding as a Service — interpret user input against NLU models built in Mix.nlu, ove...24.9 Nuance Mix NRaaS gRPC APIGrammar-based recognition as a Service — grammar-driven speech recognition over a gRPC runtime service.24.9 Nuance Mix TTSaaS gRPC APIText-to-Speech as a Service — turn text into synthesized speech (including neural voices) over a gRPC Synth...24.9 Cisco NX-OS gNMI/gRPC APIgRPC Network Management Interface for streaming telemetry and configuration management on Nexus switches.24.8 Apache Arrow Flight RPCArrow Flight is a high-performance RPC framework built on gRPC for transferring large datasets using the Ar...24.2 Anduril Lattice SDKThe Lattice SDK provides programmatic access to Anduril's Lattice platform so partners can publish entities...24.1 Apache Beam Job Service APIThe Beam Job Service API provides a gRPC-based interface for submitting, managing, and monitoring Apache Be...23.6 KratosKratos is a Go framework for building cloud-native microservices, originally created at Bilibili. It provid...23.5 TypeSpec Protobuf EmitterEmits Protocol Buffer `.proto` files from TypeSpec service definitions, enabling gRPC service generation fr...23.3 Apache SkyWalking gRPC Data Collect ProtocolThe SkyWalking data collection protocol defines gRPC service definitions for telemetry data ingestion from ...22.8 Lightwalletd gRPC APIA bandwidth-efficient gRPC service that provides a compact block streaming interface to the Zcash blockchai...22.7 Boston Dynamics Spot SDKThe Spot SDK is an open-source SDK for developing applications and payloads for the Spot quadruped robot. B...21.8 Bruno API ClientThe core open-source, git-native desktop API client (a lightweight Postman/Insomnia alternative). Compose a...21.2 EigenDA Churner APIgRPC service that handles operator registration via the Churn RPC. The Churner decides whether new operator...20.3 EigenDA Disperser APIgRPC API exposed by the EigenDA Disperser. Rollups submit raw blobs to DisperseBlob, then poll GetBlobStatu...20.3 EigenDA Relay APIgRPC service exposing GetBlob, GetChunks, and GetValidatorChunks against blobs stored by the relay layer. R...20.3 EigenDA Retriever APIgRPC service that fans out chunk requests to EigenDA operator nodes and reconstructs the original blob from...20.3 EigenDA Validator Node APIgRPC API served by EigenDA operator nodes. Validators receive chunk dispersals from the Disperser, sign agg...20.3 Google API Improvement Proposals (AIPs)Google's design review system, modeled on Python PEPs and Rust RFCs. AIPs are numbered, individually review...20.0 Protocol BuffersProtocol Buffers (Protobuf) is Google's language-neutral, platform-neutral, extensible mechanism for serial...20.0 Dash Platform DAPI (Decentralized API)Decentralized HTTP API exposing gRPC and JSON-RPC endpoints for both Dash Core layer 1 and Dash Platform la...19.1 Dex gRPC APIgRPC management API for Dex covering OAuth2 client lifecycle (Create, Get, Update, Delete, List), password ...17.4 gRPC StreaminggRPC supports four call patterns — unary, server streaming, client streaming, and bidirectional streaming —...17.0 gRPC and Protocol BuffersgRPC is a high-performance RPC framework using HTTP/2 and Protocol Buffers (Protobuf) as its IDL and wire f...15.4 YaakYaak is an open-source desktop API client for organizing and executing REST, GraphQL, WebSockets, Server Se...13.6 Grpcurlgrpcurl is an open source command-line tool for interacting with gRPC servers, like curl for gRPC with supp...12.5

Minimal 3 Almost no public developer surface

KreyaKreya is a GUI client for gRPC and REST APIs with innovative features for environments, authorizations, and...10.7 VOLTHAVOLTHA (Virtual Optical Line Termination Hardware Abstraction) is an open source platform that virtualizes ...10.0 Ezyezy is a graphical gRPC and gRPC-Web client for testing and debugging gRPC services with an intuitive deskt...8.6

Score breakdown

Frequency

64.1

log-scaled weighted occurrences

Breadth

4.0

spread across providers

Quality lift

43.2

mean composite of providers using it

Cohesion

6.7

strength of nearest seed neighbor

Where this tag comes from

Api tag157

Provider tag81

Cohort brief

Auto-generated

The 147 providers in the APIs.io catalog tagged gRPC, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers

147

all scored

Mean Kin Score

35.5

+14.8 vs catalog 20.7

Mean Agent Readiness

19.4

+9.7 vs catalog 9.7

Spread

8.6–83.3

median 33.8 · σ 13.5

How the 147 split by band

Exemplar 2Strong 12Developing 39Thin 55Emerging 35Minimal 4

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Developer Ergonomics	41.8	17.9	+23.9	147
Contract Quality	36.6	17.5	+19.1	147
Operational Transparency	26.5	11.3	+15.2	147
Discoverability	71.2	60.4	+10.8	147
Contract Governance	12.9	6.4	+6.5	147
Access Clarity	28.5	22.3	+6.2	147

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)	39%	16%	+23
MCP server (first-party)	11%	7%	+4
Agent Skills	0%	0%	0
OAuth scopes	12%	9%	+3
Security	96%	88%	+8
Arazzo workflows	4%	2%	+2
Governance rules	34%	13%	+21

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 Salesforce 83.3
2 Heroic Labs 70.4
3 Postman 64.5
4 Vendasta 63.3
5 Viam 61.6
6 Stack Moxie 60.8
7 Temporal 59.5
8 Decart 57.6
9 Kaiko 57.5
10 Rigetti Computing 57.2

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gRPC

Providers using this tag (147)

APIs with this tag (155)