established · 1.4

Schema

Score 26.0 / 100 90 providers 92 APIs Search apis.io →
Variants seen in the corpus: Schemaschema

Providers using this tag (90)

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Exemplar 5 Complete, well-documented, and agent-ready
SalesforceFortune 500Artificial IntelligenceAnalyticsCloud294 APIs83.3HubSpotAnalyticsCommerceContentCRM93 APIs82.4RudderStackCustomer Data PlatformCDPData PipelineOpen-Source13 APIs80.2OptimizelyA/B TestingContent ManagementCustomer DataE-Commerce50 APIs75.1API EvangelistAPI EvangelistDeveloper PortalAPI ResearchAPI Governance17 APIs69.8
Strong 14 Solid coverage with minor gaps
SAP EmarsysMarketing AutomationCustomer EngagementEmail MarketingOmnichannel25 APIs66.4CelonisCompanyAutomationProcess MiningProcess Intelligence17 APIs66.2LyticsCustomer Data PlatformCDPPersonalizationSegmentation2 APIs65.6FactsetFinancialFinancial DataInvestment AnalyticsMarket Data460 APIs64.8ServiceNowAutomationCloud ServicesDigital WorkflowsEnterprise Platform63 APIs64.8YoastSEOWordPressContent Optimization9 APIs64.7LucidVisual CollaborationDiagrammingWhiteboardingProductivity5 APIs61.8AutodeskFortune 10003D ModelingArchitectureBIM69 APIs60.2AbloAgent Infrastructuremulti-agent-coordinationconcurrency-controlState Management8 APIs59.0Microsoft Azure API ManagementA2AAI GatewayAPI CenterAPI Gateway71 APIs58.0TykAPI GatewayAPI ManagementGraphQLOpen-Source39 APIs57.7EnchargeEmail MarketingMarketing AutomationTransactional EmailSoftware-as-a-Service16 APIs57.3Microsoft AzureAPI ManagementCloudCloud ComputingEnterprise1667 APIs57.3SnowflakeData LakesData SharingData WarehousingDatabase47 APIs54.6
Developing 27 Usable, with meaningful gaps to close
HasuraData AccessGraphQL13 APIs53.9MonetateCompanyPersonalizationExperience OptimizationA/B Testing5 APIs52.7NetBox LabsCompanyNetworkingDCIMIPAM13 APIs51.9SuprSendNotificationMulti-ChannelEmailSMS21 APIs51.3NimbleCRMSalesContact ManagementRelationship Management13 APIs51.2Salesforce Sales CloudCloudCRMCustomer ManagementEnterprise52 APIs51.1Aito TechnologiesCompanyPredictive DatabaseMachine-LearningArtificial Intelligence3 APIs50.9Looker StudioAnalyticsBusiness IntelligenceDashboardsData Visualization11 APIs50.5SkeduloCompanyEnterpriseSchedulingField Service Management67 APIs49.9FixieCompanyVoice AIConversational AIReal-Time14 APIs49.8FairmarkitCompanyProcurementSourcingSupply Chain18 APIs49.7WeaviateVector DatabaseArtificial IntelligenceMachine-LearningSemantic Search22 APIs49.1OpsMillCompanyInfrastructure SaasNetwork AutomationSource of Truth16 APIs48.6AuthzedAuthorizationAccess ControlPermissionsZanzibar6 APIs47.9AGNTCYAI AgentsInteroperabilitySpecificationOpen-Source5 APIs47.6NexCompanyAI AgentsKnowledge GraphContext16 APIs47.1AptlyCompanyCloud SaasProperty ManagementReal-Estate15 APIs47.0SparetechCompanyManufacturingSpare PartsMRO6 APIs46.8WeblateLocalizationTranslationInternationalizationOpen-Source21 APIs44.8KalturaVideoLive StreamingTranscodingMedia Management222 APIs44.2APIToolkit (Monoscope)AI ObservabilityAPI AnalyticsAPI CatalogAPI Management7 APIs42.9Apache APISIXApacheAPI GatewayCloud-NativeKubernetes18 APIs42.2Ruby Programming Language and Popular API GemsProgramming LanguageRubyHTTPREST23 APIs40.6AT ProtocolAt-ProtocolatprotoBlueskyFederation12 APIs40.0DoclingDocumentsParsingPDFOCR18 APIs39.8Apache SolrEnterprise SearchFull-Text SearchLuceneSearch10 APIs39.5Cybersecurity and Infrastructure Security AgencyAdvisoriesAISBinding Operational DirectiveCSAF4 APIs39.4
Thin 26 Limited public surface area
ConxaiCompanyConstructionAECArtificial Intelligence17 APIs39.0The GuildAPI CompositionAPI GatewayAPI ObservabilityBreaking Change Detection10 APIs37.8gRPCCNCFHTTP/2MicroservicesProtocol Buffers7 APIs37.2Utrecht UniversityEducationHigher EducationUniversityNetherlands21 APIs37.0WAODAOAI AgentsArtChainHuman and AINFT Metadata4 APIs36.8TigerGraphGraph DatabaseAnalyticsGSQLREST++5 APIs36.5HelmChartsCloud-NativeContainer OrchestrationDevOps10 APIs36.4EmitwiseCarbon AccountingGreenhouse GasScope 3Supply Chain Emissions5 APIs35.8SmartMindCompanyArtificial IntelligenceMachine-LearningDatabase8 APIs35.7TriplitDatabaseReal-TimeSyncLocal-First9 APIs35.7SteamGamingValveDistributionSteamworks25 APIs35.5AuthentikAuthenticationAuthorizationIdentity ProviderLDAP10 APIs35.3SilverStripeCMSContent ManagementGraphQLREST API2 APIs35.2CogniteIndustrial IoTManufacturingIndustrial DataDigital Twin90 APIs33.2tidb23 APIs32.7Taxi - Describe How Your APIs and Data RelateAPI DescriptionData IntegrationOpen-SourceQuery Language8 APIs32.3FiberyWork ManagementProject ManagementCollaborationNo-Code2 APIs31.9Sinclair, Inc.BroadcastingTelevisionLocal NewsSports Media1 API31.6Amazon AppSyncAmazon AppSyncGraphQLAPI ManagementServerless9 APIs31.3Schema.orgSchema.orgStructured DataLinked DataJSON-LD4 APIs31.0fauna9 APIs30.4FragmentLedgerDouble-EntryAccountingFintech6 APIs29.9APIs.io Engineering PlatformAPIs.ioEngineeringPlatform470 APIs29.1NetBoxData-CenterDCIMInfrastructure as CodeIPAM14 APIs29.1Arkose LabsCompanyEnterpriseSecurityBot Management3 APIs29.0PortInternal Developer PortalService CatalogSelf-Service ActionsPlatform Engineering16 APIs26.4
Emerging 17 Early or largely undocumented
Commerce OneCompanyB2BE-CommerceProcurement1 API26.0ReactomeBiological PathwaysBioinformaticsLife SciencesPathway Analysis23 APIs25.6Agent ReadinessAgent ReadinessAI AgentsAPI DiscoveryAPI Governance15 APIs25.0Apache SolrSearchEnterprise SearchFull-Text SearchOpen-Source8 APIs24.1Gleeful AIArtificial IntelligenceAgentsx402Micropayments17 APIs23.9Model Context Protocol (MCP)MCPAI AgentsToolsResources17 APIs22.8Zipline AiCompany4 APIs21.3AllotexCompanyMedical DevicesOphthalmologyBiologics6 APIs20.7FVAP.govGovernmentVoting6 APIs19.7Citation File FormatAcademicCitationMetadataOpen Standard6 APIs19.4Overture Maps FoundationMapsGeospatialOpen DataGeoParquet11 APIs18.1Apache AvroApacheBig DataBinary FormatData Serialization1 API17.4Amazon Web ServicesAmazonCloudNetworkIndex1804 APIs16.7Cap'n ProtoBinary FormatCapability-Based SecurityCode GenerationIPC5 APIs15.8API SpecificationsAPI SpecificationSpecification LanguagesAPI DesignContracts13 APIs15.4Customer DatabaseAccountConsentContactsCRM15.2Apache ParquetApacheBig DataColumnar StorageData Format6 APIs12.1
Minimal 1 Almost no public developer surface
DFDLApache DaffodilBinary DataData DescriptionData Formats7.2

APIs with this tag (92)

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 5 Complete, well-documented, and agent-ready
Salesforce Schema APIThe Schema API from Salesforce — 4 operation(s) for schema.83.3HubSpot Custom Objects APICustom objects allow you to define and create CRM object types that represent data unique to your business....82.4RudderStack Data Catalog APIThe RudderStack Data Catalog API exposes the inventory of events and properties seen across all sources, su...80.2Optimizely Schema APIManage the ODP schema including domain objects and their fields.75.1API Evangelist SchemaThe naming and structure of the digital objects we pass back and forth via APIs within the business and per...69.8
Strong 13 Solid coverage with minor gaps
SAP Emarsys Fields APIIn this batch you may find endpoints related to fields. Published by SAP Emarsys as a Swagger 2.0 document ...66.4Celonis Schema APIThe Schema API from Celonis — 6 operation(s) for schema.66.2Lytics API v2Version 2 of the Lytics API — the current REST surface for the Lytics customer data platform. Covers accoun...65.6Factset Schema APIThe Schema API from Factset — 1 operation(s) for schema.64.8ServiceNow CMDB Meta APIThe ServiceNow CMDB Meta API provides REST endpoints for retrieving metadata about CMDB classes, including ...64.8Lucid Data APIThe Lucid Data API enables external applications to create, read, update, and delete structured data linked...61.8Autodesk Schema APIThe Schema API from Autodesk — 1 operation(s) for schema.60.2Ablo Schema APIThe schema API from Ablo — 1 operation(s) for schema.59.0Microsoft Azure API Management Schema APIThe Schema API from Microsoft Azure API Management — 2 operation(s) for schema.58.0Tyk Schema APIGet OAS schema.57.7Encharge Custom Objects Schema APIThe Custom Objects Schema API from Encharge — 10 operation(s) for defining object types, their fields, and ...57.3Microsoft Azure Resource JSON SchemaJSON Schema definitions for core Azure Resource Manager data models including the base Resource type, Resou...57.3Snowflake schema APIThe schema API from Snowflake — 4 operation(s) for schema.54.6
Developing 27 Usable, with meaningful gaps to close
Hasura Metadata APIHasura metadata management.53.9Monetate Data APICreate and manage data schemas and send customer, product and catalog data into Monetate in real time for u...52.7NetBox Labs schema APIThe schema API from NetBox Labs — 1 operation(s) for schema.51.9SuprSend Schema APIThe Schema API from SuprSend — 3 operation(s) for schema.51.3Nimble Contacts Fields APIUser-definable contact field schema — fields, choice option lists, field groups and tabs, plus primary-valu...51.2Salesforce GraphQL APIQuery Salesforce data using GraphQL, allowing clients to request exactly the fields they need in a single r...51.1Aito Technologies schema APIThe schema API from Aito Technologies — 5 operation(s) for schema.50.9Looker Studio Schema APIOperations for defining the data structure and field definitions returned by the connector.50.5Skedulo Schema APIThe Schema API from Skedulo — 1 operation(s) for schema.49.9Fixie schema APIThe schema API from Fixie — 1 operation(s) for schema.49.8Fairmarkit Schema APIThe Schema API from Fairmarkit — 2 operation(s) for schema.49.7Weaviate schema APIThe schema API from Weaviate — 12 operation(s) for schema.49.1OpsMill Schema APIThe Schema API from OpsMill — 6 operation(s) for schema.48.6Authzed Schema APIManage SpiceDB schema definitions, diff schemas, and reflect schema metadata47.9OASF Schema APIThe Open Agentic Schema Framework schema server API. Browse and retrieve the OASF schema, walk the skill / ...47.6Nex Schema APIThe Schema API from Nex — 4 operation(s) for schema.47.1Aptly Schema APIThe Schema API from Aptly — 1 operation(s) for schema.47.0Sparetech Schema APIThe Schema API from Sparetech — 2 operation(s) for schema.46.8Weblate schema APIThe schema API from Weblate — 1 operation(s) for schema.44.8Kaltura schema APIExpose the schema definitions for syndication MRSS, bulk upload XML and other schema types.44.2APIToolkit (Monoscope) Schema APIRetrieve telemetry field schema for a project.42.9Apache APISIX Schema APIValidate resource configurations against APISIX schemas.42.2RBS (Ruby Type Signatures)A language for describing the structure of Ruby programs. Lets developers declare classes, modules, method ...40.6AT Protocol Lexicon SchemasLexicon is the schema definition language for AT Protocol. Every record type, XRPC method, and event subscr...40.0Docling Core TypesCanonical `DoclingDocument` data model and serialization primitives — text, tables, pictures, layout, hiera...39.8Apache Solr Schema APIRead and modify the schema of a collection39.5Cybersecurity and Infrastructure Security Agency Schema APIJSON Schema for the KEV catalog39.4
Thin 28 Limited public surface area
Conxai schema APIThe schema API from Conxai — 1 operation(s) for schema.39.0Protocol Buffers Service Definition SchemaJSON Schema for Protocol Buffers service definition format (.proto files). Describes the structure of gRPC ...37.2Utrecht University schema APIThe schema API from Utrecht University — 1 operation(s) for schema.37.0WAODAO Schema APIRead WAODAO-specific field semantics and discovery links.36.8TigerGraph Schema APIThe Schema API from TigerGraph — 3 operation(s) for schema.36.5Helm Chart.yaml SchemaJSON Schema defining the structure and validation rules for Chart.yaml, the metadata file required in every...36.4Helm Repository Index SchemaJSON Schema for the index.yaml file served by Helm chart repositories. The index is the primary discovery m...36.4Helm Values YAML SchemaJSON Schema describing common conventional patterns for values.yaml files in Helm charts. Values.yaml provi...36.4Emitwise Schema APIActivity data schema definitions.35.8SmartMind schema APIThe schema API from SmartMind — 2 operation(s) for schema.35.7Triplit Schema APIDatabase schema management35.7ISteamUserStatsISteamUserStats provides global achievement percentages, schema for game stats and achievements, and per-us...35.5ISteamWebAPIUtilISteamWebAPIUtil provides helper endpoints — GetServerInfo (Steam server time/version) and GetSupportedAPIL...35.5Authentik Schema APISelf-describing OpenAPI schema.35.3SilverStripe GraphQL APISilverStripe's GraphQL API provides a content API layer for getting data in and out of the CMS. It supports...35.2Cognite Schema APISchema provides the expected schema for CDF resources.33.2tidb Schema APIEndpoints for retrieving database and table schema information from the TiDB information schema.32.7Fibery GraphQL APIGraphQL API for querying and mutating Fibery workspace data, with an interactive IDE for schema exploration...31.9Sinclair Corporate Content APIThe public, unauthenticated read surface of Sinclair's corporate site at sbgi.net. Sinclair runs no develop...31.6Amazon AppSync Schema APIManage GraphQL schema documents31.3Schema.org Markup ValidatorThe Schema.org Markup Validator tests and validates structured data markup against the Schema.org vocabular...31.0Schema.org WebAPI TypeThe Schema.org WebAPI type defines a Web API accessible over Web and Internet technologies. It provides sta...31.0fauna Schema APIFetch, update, validate, and manage a database's schema as FSL files. Supports staged schema changes with s...30.4Fragment Schema APIDefine and version the ledger Schema - the chart of accounts, account types (asset, liability, income, expe...29.9APIs.io Engineering Platform Schema APIThe **Schema** endpoints enable you to manage your API definitions. These endpoints also support multi-file...29.1NetBox schema APIThe schema API from NetBox — 1 operation(s) for schema.29.1Arkose Labs Schema APIMachine-readable request/response schemas29.0Port Blueprints APIEndpoints to create, read, update, and delete blueprints - the schemas that define an organization's data m...26.4
Emerging 19 Early or largely undocumented
xCBL — XML Common Business LibraryxCBL 4.0 is a royalty-free library of XML business documents and reusable components for business-to-busine...26.0Reactome schema APIReactome Data: Schema class queries25.6JSON SchemaThe vocabulary that lets an agent validate request and response bodies against typed contracts. Published J...25.0Apache Solr REST APIHTTP/REST API for Apache Solr providing endpoints for querying, indexing, schema management, collections ad...24.1Apache Solr Schema APIPer-collection schema operations24.1Gleeful AI Schema APIThe Schema API from Gleeful AI — 1 operation(s) for schema.23.9MCP SpecificationThe authoritative protocol definition for the Model Context Protocol, maintained at modelcontextprotocol.io...22.8Zipline Ai schema APIThe schema API from Zipline Ai — 5 operation(s) for schema.21.3Allotex Schema APIRegistered post types, taxonomies and statuses.20.7FVAP.gov Schema APIXML schema definition.19.7Citation File Format SchemaThe CFF schema defines the structure of a CITATION.cff file in YAML, including required cff-version, messag...19.4Overture SchemaCanonical open schema specification for all Overture themes, maintained in the OvertureMaps/schema GitHub r...18.1Apache Avro Schema FormatJSON Schema for validating Apache Avro schema definitions. Covers all Avro types including primitive types ...17.4Amazon Web Services Schema APIThe Schema API from Amazon Web Services — 1 operation(s) for schema.16.7Cap'n Proto Schema LanguageThe Cap'n Proto schema language is used to define message types in .capnp files that are then compiled into...15.8GraphQL SDLGraphQL is a query language and runtime for APIs, defined by the GraphQL Specification. The GraphQL Schema ...15.4JSON SchemaJSON Schema is a declarative language for annotating and validating JSON documents. It is the foundational ...15.4JSON StructureJSON Structure is an emerging open specification that extends and complements JSON Schema with a clearer, m...15.4Apache Parquet Format SpecificationThe core specification for the Parquet columnar storage format.12.1

Score breakdown

Frequency
61.2
log-scaled weighted occurrences
Breadth
2.5
spread across providers
Quality lift
50.4
mean composite of providers using it
Cohesion
0.0
strength of nearest seed neighbor

Related tags

Query 16 co-occurrences Relationships 6 co-occurrences Objects 7 co-occurrences Batch 9 co-occurrences Sync 6 co-occurrences Timelines 5 co-occurrences Views 6 co-occurrences Validation 7 co-occurrences

Where this tag comes from

Api tag90
Provider tag8
Openapi tag52
Openapi op tag172

Cohort brief

Auto-generated

The 90 providers in the APIs.io catalog tagged Schema, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers
90
all scored
Mean Kin Score
41.5
+20.8 vs catalog 20.7
Mean Agent Readiness
25.8
+16.1 vs catalog 9.7
Spread
7.2–83.3
median 39.5 · σ 16.7
How the 90 split by band
Exemplar 5Strong 14Developing 27Thin 26Emerging 17Minimal 1
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Contract Quality 50.5 17.5 +33 90
Developer Ergonomics 41.7 17.9 +23.8 90
Operational Transparency 29.3 11.3 +18 90
Contract Governance 19.9 6.4 +13.5 90
Access Clarity 35.1 22.3 +12.8 90
Discoverability 72.1 60.4 +11.7 90

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
ArtifactThis cohortCatalogDifference
MCP server (any) 42% 16% +26
MCP server (first-party) 23% 7% +16
Agent Skills 0% 0% 0
OAuth scopes 22% 9% +13
Security 97% 88% +9
Arazzo workflows 9% 2% +7
Governance rules 56% 13% +43

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. 1 Salesforce 83.3
  2. 2 HubSpot 82.4
  3. 3 RudderStack 80.2
  4. 4 Optimizely 75.1
  5. 5 API Evangelist 69.8
  6. 6 SAP Emarsys 66.4
  7. 7 Celonis 66.2
  8. 8 Lytics 65.6
  9. 9 Factset 64.8
  10. 10 ServiceNow 64.8
Top by Agent Readiness
  1. 1 HubSpot 54.4
  2. 2 Factset 52.8
  3. 3 Salesforce 52.2
  4. 4 Monetate 52
  5. 5 RudderStack 52
  6. 6 Celonis 51.8
  7. 7 Microsoft Azure 49.6
  8. 8 Lucid 48.3
  9. 9 API Evangelist 44.8
  10. 10 Autodesk 43.2
All 90 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

Every tag here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for tags

7 MCP tools reach this
  • 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.
All 92 tools

Call it yourself

curl for this page
This tag 
curl "https://apis.io/api/v1/tags/schema"
All tags 
curl "https://apis.io/api/v1/tags?limit=25"
As a scored cohort 
curl "https://apis.io/api/v1/cohorts/tag/schema"
The distribution (Pro) 
curl "https://apis.io/api/v1/cohorts/tag/schema/stats" \
  -H "X-API-Key: $APIS_IO_KEY"

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