established · 1.7 capability schema

Validation

Score 24.8 / 100 78 providers 85 APIs Search apis.io →
Variants seen in the corpus: VALIDATIONValidation

Providers using this tag (78)

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

Exemplar 7 Complete, well-documented, and agent-ready
RudderStackCustomer Data PlatformCDPData PipelineOpen-Source13 APIs80.2VesselCRMChatDialerEmbedded Integrations20 APIs72.1DeBounceEmail ValidationEmail VerificationDeliverabilityDisposable Email Detection6 APIs71.8ZeroBounceEmail ValidationEmail DeliverabilityEmail VerificationMarketing6 APIs69.2Google AnalyticsAnalyticsDataGoogleMetrics13 APIs68.4Google Search ConsoleAnalyticsGoogleIndexingSearch6 APIs67.1Tvarka ATK APIAuthenticationDigital SignatureeIDASQES9 APIs66.6
Strong 11 Solid coverage with minor gaps
PropelAuthAuthenticationIdentityB2BMulti-Tenancy18 APIs65.9AffindaArtificial IntelligenceDocument ProcessingIntelligent Document ProcessingIDP16 APIs64.7UiPathAutomationRobotic Process AutomationRPAArtificial Intelligence32 APIs61.7ZeptoPaymentsAustraliaReal-Time PaymentsAccount-to-Account7 APIs59.7KnakCompanyEmail MarketingMarketing AutomationLanding Pages21 APIs58.7DocusignAgreementsContractsDigital Transaction ManagementDocuments134 APIs58.2KickboxEmail VerificationEmail ValidationDeliverabilityData Quality5 APIs57.9YubicoCompanyEnterpriseAuthenticationSecurity1 API57.6mParticleCustomer Data PlatformCDPAnalyticsIdentity Resolution6 APIs57.2ConvivaAnalyticsStreamingVideoObservability9 APIs56.3BluecoreCompanyRetailMarketingCustomer Data Platform8 APIs54.9
Developing 19 Usable, with meaningful gaps to close
APIMaticAPI TransformationCode GenerationDeveloper ExperienceDocumentation6 APIs51.6Oracle GoldenGateCDCData IntegrationData SynchronizationDatabase37 APIs50.9Google Maps PlatformEnvironmentGeocodingGeolocationMaps41 APIs49.8TruecallerCompanyConsumerCaller IDPhone Verification4 APIs48.0AGNTCYAI AgentsInteroperabilitySpecificationOpen-Source5 APIs47.6American Express Global Business TravelTravelUnited StatesCorporate TravelTravel Management17 APIs47.6Australia and New Zealand Banking Group (ANZ)FinancialBanksOpen BankingCDR16 APIs46.6SplunkAnalyticsData AnalysisLoggingMachine Data14 APIs46.5MastercardCredit CardsDigital IdentityFinancial-ServicesFraud Detection249 APIs46.2Smart DCCEnergyUnited KingdomUtilitiesElectricity1 API45.3GoogleAdvertisingCloudDevelopersGoogle125 APIs45.2VatstackVATTaxEU7 APIs43.1LightdashBusiness IntelligenceAnalyticsdbtSemantic Layer50 APIs42.5SwitstackCompanyFintech InsurtechPaymentsEMV2 APIs42.2Modern TreasuryFintechPaymentsACHWires44 APIs41.6_doneDeveloper ToolsUtility APIsAI Agentsagent-native27 APIs41.0cdisc7 APIs40.8RokuStreamingTelevisionMediaEntertainment27 APIs40.3ScalarAPI ClientAPI DocumentationAPI ReferencesCode Generation30 APIs40.3
Thin 16 Limited public surface area
Juniper NetworksArtificial IntelligenceAutomationCloudEnterprise48 APIs37.1HelmChartsCloud-NativeContainer OrchestrationDevOps10 APIs36.4CloudmersiveBarcodesConversionsDocumentsImage Recognition2 APIs35.8DeepchecksArtificial IntelligenceLLMEvaluationTesting7 APIs35.8Department of Veterans Affairs (VA)Federal-GovernmentHealthcareVeterans30 APIs35.6StoplightAPI DesignAPI DocumentationAPI GovernanceAsyncAPI6 APIs35.3Voltage ParkGPUCloudAI InfrastructureH1007 APIs35.1Application ResearchApplication DependenciesCloud-NativeIntegrationResearch36 APIs34.5WorkWaveField ServiceRoute OptimizationLast Mile DeliveryFleet11 APIs33.7TelefonoCarrier LookupData EnrichmentFraud PreventionNumber Intelligence4 APIs32.8UMLUMLModelingDiagramsSoftware Architecture3 APIs31.8Vert.xEvent-DrivenFrameworksJavaJVM7 APIs31.4Schema.orgSchema.orgStructured DataLinked DataJSON-LD4 APIs31.0meddra4 APIs30.9DHLFreightLogisticsShippingE-Commerce51 APIs29.5TainaCompanyTax ComplianceRegTechFATCA1 API29.3
Emerging 23 Early or largely undocumented
NumLookupAPINumber VerificationPhone ValidationPhone Number LookupCarrier Lookup2 APIs25.1Agent ReadinessAgent ReadinessAI AgentsAPI DiscoveryAPI Governance15 APIs25.0TypeSpecAPI DesignCode GenerationOpenAPIProtocol Buffers6 APIs23.3IRSIRSTaxFederal-GovernmentTIN Matching5 APIs23.0MoodleE-LearningEdTechLMSMoodle12 APIs22.1SmithyCode GenerationIDLSDKAPI Design2 APIs21.2Citation File FormatAcademicCitationMetadataOpen Standard6 APIs19.4AngularDeferrable ViewsFrameworkFrontendJavaScript9 APIs17.2BeaconcureCompanyClinical TrialsClinical DataLife Sciences1 API17.2Angular 14FrameworkFrontendJavaScriptOpen-Source8 APIs17.1Angular 15FrameworkFrontendJavaScriptOpen-Source6 APIs17.1Angular 17Deferrable ViewsFrameworkFrontendJavaScript7 APIs17.1Angular 18FrameworkFrontendJavaScriptMaterial 37 APIs17.1Angular 20FrameworkFrontendIncremental HydrationJavaScript7 APIs17.1HapiAuthenticationFrameworksJavaScriptNode.js1 API17.0Shell ScriptingAutomationBashCLIDevOps5 APIs16.2ConnexionAPI DesignASGIDesign-FirstFlask2 APIs15.8API SpecificationsAPI SpecificationSpecification LanguagesAPI DesignContracts13 APIs15.4Bean ValidationBean ValidationData QualityJava3 APIs15.4Jakarta EEEnterpriseJakarta EEJavaStandards6 APIs15.0Regular ExpressionsPattern MatchingProgrammingString ManipulationText Processing14.9Hibernate ORMDatabaseJavaJPAObject-Relational Mapping4 APIs13.9JSR-303AnnotationsBean ValidationJavaJSR-3031 API12.5
Minimal 2 Almost no public developer surface
Sware (fka BTR)CompanyHealthcareLife Sciences10.4GesundCompanyHealthcareArtificial IntelligenceClinical AI9.9

APIs with this tag (85)

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 18 Complete, well-documented, and agent-ready
RudderStack Tracking Plan APIThe RudderStack Tracking Plan API defines and enforces the canonical event schema (events, properties, trai...80.2Vessel ActiveCampaign Actions APIThe Vessel Actions API for ActiveCampaign — typed, validated wrappers over ActiveCampaign's native API serv...72.1Vessel Aircall Actions APIThe Vessel Actions API for Aircall — typed, validated wrappers over Aircall's native API served under /api/...72.1Vessel Apollo Actions APIThe Vessel Actions API for Apollo — typed, validated wrappers over Apollo's native API served under /api/ac...72.1Vessel Dialpad Actions APIThe Vessel Actions API for Dialpad — typed, validated wrappers over Dialpad's native API served under /api/...72.1Vessel Mailchimp Actions APIThe Vessel Actions API for Mailchimp — typed, validated wrappers over Mailchimp's native API served under /...72.1Vessel Microsoft Teams Actions APIThe Vessel Actions API for Microsoft Teams — typed, validated wrappers over Microsoft Teams's native API se...72.1Vessel monday.com Actions APIThe Vessel Actions API for monday.com — typed, validated wrappers over monday.com's native API served under...72.1Vessel Outreach Actions APIThe Vessel Actions API for Outreach — typed, validated wrappers over Outreach's native API served under /ap...72.1Vessel RingCentral Actions APIThe Vessel Actions API for RingCentral — typed, validated wrappers over RingCentral's native API served und...72.1Vessel Salesforce Actions APIThe Vessel Actions API for Salesforce — typed, validated wrappers over Salesforce's native API served under...72.1Vessel Salesloft Actions APIThe Vessel Actions API for Salesloft — typed, validated wrappers over Salesloft's native API served under /...72.1Vessel Slack Actions APIThe Vessel Actions API for Slack — typed, validated wrappers over Slack's native API served under /api/acti...72.1DeBounce Validation APIReal-time single email address validation. Returns a deliverability result (Safe to Send, Risky, Invalid, U...71.8ZeroBounce Validation APIThe ZeroBounce ChatGPT-plugin validation surface — 2 operations for single and batch email validation, serv...69.2Google Analytics Validation APIThe Validation API from Google Analytics — 1 operation(s) for validation.68.4Google Search Console URL Testing Tools APIProvides tools for running validation tests against single URLs, including mobile-friendly testing and rich...67.1Tvarka ATK API Validation APIStandalone advisory validation of signed artifacts.66.6
Strong 12 Solid coverage with minor gaps
PropelAuth Validation APIValidate end-user, personal, organization, and imported API keys65.9Affinda Annotations APIManually create, update, and delete annotations on uploaded documents. Annotations are the field-level extr...64.7Affinda Validation Results APITrack the status and findings of validation rules attached to parsed documents. Validation results record p...64.7UiPath Validation APIValidate and correct digitization, classification, and extraction results61.7Zepto Validate API (Confirmation of Payee)Confirmation of Payee (CoP) account validation — verify that a payee's account name matches the account det...59.7Knak Validation APIThe Custom Validator contract — 1 operation. This is a contract the CUSTOMER implements so Knak can run ass...58.7Docusign Connected Fields APIThe Docusign Connected Fields API enables developers to validate envelope field data programmatically. It a...58.2Kickbox Email Verification APIREST API for verifying the deliverability of email addresses in real time. Returns a result (deliverable, u...57.9Yubico Validation APIYubico OTP validation operations.57.6mParticle Data Planning APIREST API for managing data plans and data plan versions in a workspace, and for validating an event batch a...57.2Conviva Validation Timeline API v2Session validation timeline data for QA and sensor-integration testing, queried by viewer_id and/or session...56.3Bluecore Transactional API (legacy)The original Bluecore Transactional API on https://api.bluecore.com/email/ - send a transactional or real-t...54.9
Developing 19 Usable, with meaningful gaps to close
APIMatic Validation APIThe Validation API from APIMatic — 1 operation(s) for validation.51.6Oracle GoldenGate Validation APIValidate connections and configurations50.9Address Validation APIValidate and standardize addresses, returning deliverability verdicts, geocodes, and address component deta...49.8Truecaller Non-Truecaller User Verification APIServer-side validation for the drop-call / IM-OTP verification flow that covers users without the Truecalle...48.0Egencia Validation SPIA service provider interface, not a consumable API - Egencia calls the customer. At checkout, when a travel...47.6OASF Schema APIThe Open Agentic Schema Framework schema server API. Browse and retrieve the OASF schema, walk the skill / ...47.6Australia and New Zealand Banking Group (ANZ) Confirmation of Payee APIANZ's first-party Confirmation of Payee API matches a recipient's account name against their BSB and accoun...46.6Australia and New Zealand Banking Group (ANZ) PayID Check APIANZ's first-party PayID Check API to verify that a PayID is registered before initiating a payment or colle...46.6Splunk AppInspect APIThe Splunk AppInspect API validates Splunk apps and add-ons against Splunk best practices and requirements ...46.5Mastercard Bill Payment ValidatorThis service is provided on behalf of the Mastercard Remote Payment and Presentment (RPPS) Bill Payment Pro...46.2DCC Boxed DUIS Signing Tool APIAn open-source HTTP API published by Smart DCC Limited for signing and validating DUIS (DCC User Interface ...45.3Google Address Validation APIThe Google Address Validation API standardizes, validates, and enriches postal addresses by checking them a...45.2Lightdash Validation APIThe Validation API from Lightdash — 2 operation(s) for validation.42.5Swittest APIREST API for the Swittest managed EMV test-automation service. Exposes test-suite and test discovery, test ...42.2Modern Treasury Validation APIThe Validation API from Modern Treasury — 1 operation(s) for validation.41.6BIMI CheckerChecks whether a website's email branding setup is correct so its logo shows up in inboxes. Checks one or m...41.0CDISC CORE (Checks and Rules Engine) APICDISC CORE (Checks and Rules Engine) is an open-source rules engine for validating clinical data against CD...40.8Roku Validation APITransaction and refund validation40.3Scalar CLIThe Scalar CLI is a command-line interface for managing OpenAPI files, generating documentation, running mo...40.3
Thin 15 Limited public surface area
JSNAPy APIPython-based snapshot and test framework for Junos devices.37.1Helm Chart.yaml SchemaJSON Schema defining the structure and validation rules for Chart.yaml, the metadata file required in every...36.4Deepchecks Open-Source TestingThe AGPL-3.0 licensed open-source Python package for continuous validation of tabular, computer-vision, and...35.8VA Address Validation APIVerify and standardize U.S. and international addresses for Veterans and their families.35.6Stoplight PrismPrism is an open-source HTTP mock and proxy server that turns any OpenAPI v2/v3 or Postman Collection file ...35.3Voltage Park Validation APIValidate cloud-init scripts before deployment.35.1Application Research Validation APIWorkload validation operations34.5WorkWave Validation APIValidate contact emails and phone numbers.33.7Telefono Validation APIPhone number validation endpoints32.8UML Validation APIValidate PlantUML source syntax31.8Vert.x OpenAPIVert.x OpenAPI provides OpenAPI 3.1 specification support for Vert.x, enabling contract-driven API developm...31.4Schema.org Markup ValidatorThe Schema.org Markup Validator tests and validates structured data markup against the Schema.org vocabular...31.0meddra Validation APICode validation for regulatory submissions30.9DHL Parcel DE PostnumberValidates postnumbers to ensure deliverability of shipments to Deutsche Post and DHL parcel lockers.29.5TAINA Tax Form APIGated REST API that lets financial institutions with their own KYC/onboarding process programmatically subm...29.3
Emerging 21 Early or largely undocumented
NumLookupAPI Validation APIPhone number validation and lookup.25.1JSON SchemaThe vocabulary that lets an agent validate request and response bodies against typed contracts. Published J...25.0TypeSpec JSON Schema EmitterEmits JSON Schema documents from TypeSpec model definitions, enabling data validation and type documentatio...23.3IRS TIN Matching APIAllows payers to submit Taxpayer Identification Number (TIN) and name combinations to be matched against IR...23.0Moodle Form APIDefines and processes user data submitted through web forms, including validation, rendering, and persistence.22.1Smithy CLIThe Smithy CLI is a command-line tool for building, validating, diffing, and transforming Smithy models. It...21.2cff-validator GitHub ActionThe cff-validator GitHub Action runs schema validation on a repository's CITATION.cff during continuous int...19.4Citation File Format SchemaThe CFF schema defines the structure of a CITATION.cff file in YAML, including required cff-version, messag...19.4Angular Forms APIAngular Forms API providing strictly typed reactive forms and template-driven forms with comprehensive vali...17.2Beaconcure Verify APIA REST API over Verify's near real-time quality-control data. Beaconcure documents it as resource-oriented,...17.2Angular 14 Forms APIAngular 14 forms APIs featuring strictly typed reactive forms. Supports both template-driven and reactive f...17.1Angular 15 Forms APIAngular 15 forms APIs with stable strictly typed reactive forms and improved form validation.17.1Angular 17 Forms APIAngular 17 forms APIs with typed reactive forms and signal-based form integration improvements.17.1Angular 18 Forms APIAngular 18 forms APIs with continued typed reactive forms support and improved signal integration.17.1Angular 20 Forms APIAngular 20 forms APIs with signal-based form integration and typed reactive forms.17.1Hapihapi is a rich, configuration-centric framework for building web applications and APIs in Node.js. It provi...17.0ShellCheck APIA static analysis tool for shell scripts that provides API access for linting and validation.16.2Connexion Python FrameworkConnexion is a contract-first Python web framework that loads an OpenAPI specification and routes requests ...15.8JSON SchemaJSON Schema is a declarative language for annotating and validating JSON documents. It is the foundational ...15.4Jakarta ValidationJakarta Validation (formerly Bean Validation) provides an object-level constraint declaration and validatio...15.0Hibernate Validator APIBean Validation reference implementation with additional constraints.13.9

Score breakdown

Frequency
55.2
log-scaled weighted occurrences
Breadth
2.1
spread across providers
Quality lift
46.3
mean composite of providers using it
Cohesion
8.1
strength of nearest seed neighbor

Related tags

Decorators 7 co-occurrences Guards 6 co-occurrences Reactive Forms 6 co-occurrences Typed Forms 6 co-occurrences Single Page Application 6 co-occurrences Interceptors 6 co-occurrences Dependency Injection 6 co-occurrences HTTP 11 co-occurrences

Where this tag comes from

Api tag82
Provider tag9
Openapi tag22
Openapi op tag34

Cohort brief

Auto-generated

The 78 providers in the APIs.io catalog tagged Validation, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers
78
all scored
Mean Kin Score
38.2
+17.5 vs catalog 20.7
Mean Agent Readiness
22.2
+12.5 vs catalog 9.7
Spread
9.9–80.2
median 36.1 · σ 18
How the 78 split by band
Exemplar 7Strong 11Developing 19Thin 16Emerging 23Minimal 2
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Contract Quality 41.3 17.5 +23.8 78
Operational Transparency 30.4 11.3 +19.1 78
Developer Ergonomics 36.9 17.9 +19 78
Access Clarity 36.2 22.3 +13.9 78
Contract Governance 16.7 6.4 +10.3 78
Discoverability 69.3 60.4 +8.9 78

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) 32% 16% +16
MCP server (first-party) 10% 7% +3
Agent Skills 0% 0% 0
OAuth scopes 21% 9% +12
Security 99% 88% +11
Arazzo workflows 15% 2% +13
Governance rules 49% 13% +36

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 RudderStack 80.2
  2. 2 Vessel 72.1
  3. 3 DeBounce 71.8
  4. 4 ZeroBounce 69.2
  5. 5 Google Analytics 68.4
  6. 6 Google Search Console 67.1
  7. 7 Tvarka ATK API 66.6
  8. 8 PropelAuth 65.9
  9. 9 Affinda 64.7
  10. 10 UiPath 61.7
Top by Agent Readiness
  1. 1 DeBounce 69
  2. 2 Knak 58.8
  3. 3 Bluecore 54.1
  4. 4 Conviva 53.6
  5. 5 RudderStack 52
  6. 6 mParticle 50.5
  7. 7 Zepto 45.8
  8. 8 American Express Global Business Travel 42.6
  9. 9 Google Analytics 42.5
  10. 10 Google 39.2
All 78 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/validation"
All tags 
curl "https://apis.io/api/v1/tags?limit=25"
As a scored cohort 
curl "https://apis.io/api/v1/cohorts/tag/validation"
The distribution (Pro) 
curl "https://apis.io/api/v1/cohorts/tag/validation/stats" \
  -H "X-API-Key: $APIS_IO_KEY"

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