Specification
Variants seen in the corpus:
Specificationspecification
Providers using this tag (22)
Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.
Strong 1 Solid coverage with minor gaps
Developing 3 Usable, with meaningful gaps to close
Thin 6 Limited public surface area
Emerging 9 Early or largely undocumented
Minimal 3 Almost no public developer surface
APIs with this tag (66)
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 1 Complete, well-documented, and agent-ready
Strong 1 Solid coverage with minor gaps
Developing 13 Usable, with meaningful gaps to close
CDEvents SpecificationCDEvents is a common specification for Continuous Delivery events that enables interoperability across CI/C...VTEX Specification APIThe Specification API from VTEX — 2 operation(s) for specification.Buildpack APIThe Buildpack API is the contract between a buildpack and the lifecycle. It defines the detect and build ex...Distribution APIThe Distribution API specifies how buildpacks and builders are packaged as OCI artifacts, signed, and distr...Platform APIThe Platform API is the contract between the CNB lifecycle and a platform such as pack, kpack, or a CI runn...AsyncAPI Server APIThe AsyncAPI Server API is the only callable HTTP API the AsyncAPI Initiative operates. It exposes the offi...AsyncAPI SpecificationThe AsyncAPI Specification is an open standard for describing asynchronous and event-driven APIs. It provid...API BlueprintAPI Blueprint is a high-level API design language created by Apiary for designing and documenting web APIs....Buildpack SpecificationThe Buildpack API (currently 0.12) defines the contract between an individual buildpack and the lifecycle. ...Image Extension SpecificationImage extensions emit Dockerfile snippets applied by the `extender` lifecycle binary to the build and/or ru...Platform SpecificationThe Platform API (currently 0.15) defines how platforms (pack, kpack, Tekton Pipelines, GitLab Auto DevOps,...CloudEvents SpecificationThe CloudEvents specification defines a set of metadata attributes that must be present in every event, inc...CloudEvents SQL (CESQL)CloudEvents SQL (CESQL) is a v1.0 specification that defines a standardized query language for filtering an...
Thin 24 Limited public surface area
OCI Spec for Rustoci-spec-rs is a Rust implementation of the OCI Runtime, Image, and Distribution Specifications, providing ...Kalshi AsyncAPI SpecificationMachine-readable AsyncAPI description of the Kalshi WebSocket streaming API. Suitable for generating async ...Acelab Material Hub Platform APIThe private production API behind the Acelab Material Hub web application and Revit add-in. It is not a pub...Notary Project Signing SpecificationThe Notary Project specification defines the signature envelope format, trust store and trust policy for co...THORChain Specification APIThe Specification API from THORChain — 2 operation(s) for specification.LAPIS SpecificationThe LAPIS specification defines a token-minimal, LLM-native format for describing HTTP APIs. A LAPIS docume...APIs.json SpecificationThe APIs.json specification defines a machine-readable JSON or YAML format for describing API operations. U...docomo Mail IMAP InterfaceThe docomo Mail IMAP interface is the one machine-interface specification NTT DOCOMO publishes openly, with...Apache Arrow Format SpecificationThe Apache Arrow columnar format specification defines the binary layout for in-memory columnar data, inclu...in-toto Attestation FrameworkThe in-toto Attestation Framework provides a specification for generating verifiable claims about any aspec...in-toto Attestation SpecificationThe in-toto specification defines the metadata format for recording software supply chain steps. It include...openEHR Admin APIAdministrative operations over EHRs. Published but marked DEVELOPMENT by openEHR. openEHR SPECIFICATION, no...openEHR Definition APIManage the definition layer — ADL 1.4 and ADL 2 templates, operational templates and stored queries. openEH...openEHR Demographic APIParty, role and demographic data handling. Published but marked DEVELOPMENT by openEHR. openEHR SPECIFICATI...openEHR EHR APIThe core openEHR record API — create and manage EHRs, compositions, directories, contributions and versione...openEHR Query APIExecute stored and ad-hoc Archetype Query Language (AQL) queries against an openEHR system. openEHR SPECIFI...openEHR System APISystem-level service endpoints for an openEHR server. openEHR SPECIFICATION, not a callable service — 1 ope...TUF Repository SpecificationThe TUF specification defines the structure of update repositories including the root, targets, snapshot, a...Smithy IDLThe Smithy Interface Definition Language (IDL) is a specification for defining API models using shapes and ...AsyncAPILinux Foundation-hosted specification for event-driven APIs. Describes servers, channels, operations, messa...CloudEventsCNCF-graduated specification (graduated January 25, 2024) for describing event data in a common way. Define...NIST SP 800-207 Zero Trust ArchitectureThe foundational specification of the Zero Trust security model. Defines the seven tenets, the PDP/PEP/PA l...MCP SpecificationThe authoritative protocol definition for the Model Context Protocol, maintained at modelcontextprotocol.io...CNI SpecificationThe CNI specification defines the interface between container runtimes and network plugins. It specifies ho...
Emerging 27 Early or largely undocumented
Jakarta Bean Validation Specification 3.1The Jakarta Bean Validation 3.1 specification defines the constraint model, annotation processor, Validator...BICS specification APIThe specification API from BICS — 1 operation(s) for specification.Overture SchemaCanonical open schema specification for all Overture themes, maintained in the OvertureMaps/schema GitHub r...AsyncAPI InitiativeAsyncAPI is an open specification standard for event-driven and message-based APIs. AsyncAPI documents defi...JSON SchemaJSON Schema provides a vocabulary for annotating and validating JSON documents. Used extensively as the pay...OpenAPI InitiativeThe OpenAPI Specification (OAS) is the de-facto standard for describing RESTful APIs. OpenAPI documents ser...Pact Contract TestingPact is a consumer-driven contract testing tool where consumers write test specifications (pacts) that defi...SpectralSpectral is an open-source JSON/YAML linter and specification validator. It evaluates OpenAPI, AsyncAPI, an...Atom 1.0Atom 1.0, defined by IETF RFC 4287, is an XML-based syndication format developed as a more rigorously speci...JSON Feed 1.1JSON Feed 1.1 is a JSON-based syndication format created by Brent Simmons and Manton Reece as a developer-f...RSS 2.0RSS 2.0 is the dominant XML-based syndication format, stewarded by the RSS Advisory Board. A feed consists ...JSON:APIJSON:API is a specification for how a client should request that resources be fetched or modified, and how ...OpenAPI SpecificationThe OpenAPI Specification (OAS) defines a standard, language-agnostic interface to RESTful APIs which allow...Apache Parquet Format SpecificationThe core specification for the Parquet columnar storage format.FOCUS (FinOps Open Cost and Usage Specification)FOCUS defines a common normalized data schema for cloud and technology billing data. The specification is d...Cap'n Proto Encoding (Wire Format)The Cap'n Proto encoding specification defines the binary wire format. The in-memory layout is the wire for...Cap'n Proto RPC ProtocolCap'n Proto's RPC protocol is a capability-based RPC layer that supports promise pipelining, object referen...Cap'n Proto Schema LanguageThe Cap'n Proto schema language is used to define message types in .capnp files that are then compiled into...WebAssembly Component Model SpecificationThe Component Model specification repository under the W3C WebAssembly Community Group. Contains design doc...Jakarta JSON BindingJakarta JSON Binding (formerly JSON-B) is a binding framework for converting Java objects to and from JSON ...Jakarta JSON ProcessingJakarta JSON Processing (formerly JSON-P) provides an API to parse, generate, transform, and query JSON doc...Jakarta RESTful Web ServicesJakarta RESTful Web Services (formerly JAX-RS) is the API specification for developing web services that fo...Jakarta ServletJakarta Servlet is a server-side Java API for handling HTTP requests and generating dynamic responses. It p...Jakarta ValidationJakarta Validation (formerly Bean Validation) provides an object-level constraint declaration and validatio...Jakarta WebSocketJakarta WebSocket defines a standard API for creating server and client endpoints that communicate using th...Margo SpecificationMargo defines an open standard specification for interoperability of edge applications, devices, and orches...Jakarta XML Web Services (JAX-WS)The Jakarta EE specification for XML web services, formerly JSR 224 JAX-WS. Defines annotations such as @We...
Companies reaching this through an API (29)
These companies publish an API, specification or operation carrying “Specification” but do not classify their business under it. Listed unranked and kept out of the count above, because one tagged operation is not a statement about what a company does.
Apache Arrow
Apache Parquet
Apiary
Bean Validation
BICS
Buildpacks Io
Cloud Native Buildpacks
Container Network Interface (CNI)
Continuous Delivery Foundation
Events
In-Toto
Jakarta EE
JAX-WS
Jentic
Kalshi
Margo
Model Context Protocol (MCP)
Notary Project
NTT Docomo
Overture Maps Foundation
Redocly
REST
Smithy
Test Specifications
The Update Framework (TUF)
THORChain
VTEX
Youki
Zero-Trust Security Model
Score breakdown
Frequency
52.5
log-scaled weighted occurrences
Breadth
0.6
spread across providers
Quality lift
29.9
mean composite of providers using it
Cohesion
8.8
strength of nearest seed neighbor
Related tags
Standards 14 co-occurrences
Linux Foundation 7 co-occurrences
CNCF 6 co-occurrences
Cloud-Native 9 co-occurrences
Validation 5 co-occurrences
Schema 5 co-occurrences
Python 10 co-occurrences
Interoperability 7 co-occurrences
Where this tag comes from
Provider tag22
Api tag69
Openapi tag3
Openapi op tag4
Work with this as data
Every tag here is available over the APIs.io API and to AI agents over MCP.