established · 0.6

Identifiers

Score 24.0 / 100 34 providers 34 APIs Search apis.io →
Variants seen in the corpus: Identifiersidentifiers

Providers using this tag (34)

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

Exemplar 3 Complete, well-documented, and agent-ready
SalesforceFortune 500Artificial IntelligenceAnalyticsCloud294 APIs83.3StripeCommerceFinancial-ServicesFintechPayments159 APIs83.2New RelicAnalysisAnalyticsAPMDevOps41 APIs68.8
Strong 10 Solid coverage with minor gaps
FactsetFinancialFinancial DataInvestment AnalyticsMarket Data460 APIs64.8Ordnance SurveyReal-EstateUnited KingdomLand RegistryGeospatial12 APIs62.6GitHubCodePipelinesPlatformSoftware Development350 APIs62.4FactivaArtificial IntelligenceBusiness IntelligenceContent AggregationEnterprise Data11 APIs61.9ZaiusCompanyCustomer Data PlatformCDPMarketing17 APIs61.7ShopifyCommerceE-CommercePaymentsRetail213 APIs60.4DatadogAnalyticsDashboardsMonitoringPlatform290 APIs57.1pVerifyHealthcareInsuranceEligibilityClaims13 APIs56.5GrafanaAlertingAnalyticsDashboardsLogs138 APIs54.8AtlassianCodeCollaborationPlatformProductivity359 APIs54.7
Developing 4 Usable, with meaningful gaps to close
Refinitiv EikonAnalyticsFinancial DataFinancial NewsMarket Data47 APIs50.6MusicBrainzMusicMetadataEncyclopediaOpen Data16 APIs44.3B3 (Brasil Bolsa Balcão)FinancialMarket DataStocksTrading10 APIs43.4CorbadoAuthenticationPasskeysWebAuthnPasswordless7 APIs40.0
Thin 9 Limited public surface area
National Center for Biotechnology Information (NCBI)BioinformaticsGenomicsLife SciencesPubMed14 APIs38.6PlacekeyLocationGeocodingAddress Matching2 APIs38.6STRINGBioinformaticsProteinsGenomicsLife Sciences7 APIs35.2Australian Digital Health AgencyHealthcareAustraliaNational Health SystemFHIR6 APIs33.9Terrain Discovery Environment APIBioinformaticsData ScienceLife SciencesFilesystem9 APIs33.6CrossrefCitationsDOIFunders8 APIs32.1RORResearchOrganizationRegistry1 API31.9OtreebaCannabisHempClothing15 APIs28.4U.S. Geological SurveyFederal GovernmentGeologicalEarth ScienceNatural Resources11 APIs28.0
Emerging 8 Early or largely undocumented
MedrioClinical TrialsElectronic Data CaptureEDCeClinical6 APIs25.6ReactomeBiological PathwaysBioinformaticsLife SciencesPathway Analysis23 APIs25.6GS1LogisticsSupply ChainBelgiumStandards2 APIs23.6UniProtProteinsBioinformaticsGenomicsLife Sciences7 APIs21.4Lane APIAsset LeasingCreditLoans177 APIs21.1SpruceIDDecentralized IdentityVerifiable CredentialsDIDsSign-In with Ethereum10 APIs18.4SonyTechnologyConsumer ElectronicsGamingEntertainment4 APIs15.3Public SectorPublic SectorGovernmentFederalStates21 APIs11.1

APIs with this tag (34)

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 3 Complete, well-documented, and agent-ready
Salesforce Identifiers APIThe Identifiers API from Salesforce — 6 operation(s) for identifiers.83.3Stripe Identifiers APIThe Identifiers API from Stripe — 15 operation(s) for identifiers.83.2New Relic Identifiers APIThe Identifiers API from New Relic — 30 operation(s) for identifiers.68.8
Strong 10 Solid coverage with minor gaps
Factset Identifiers APIThe Identifiers API from Factset — 2 operation(s) for identifiers.64.8OS Linked Identifiers APIResolves the relationships between properties, streets, and OS MasterMap identifiers - UPRN to TOID to USRN...62.6GitHub Identifiers APIThe Identifiers API from GitHub — 1 operation(s) for identifiers.62.4Factiva Code APIEnables retrieval of codes necessary to search for companies, currencies, exchanges, locations, industries,...61.9Zaius Identifiers APIThe Identifiers API from Zaius — 3 operation(s) for identifiers.61.7Shopify Identifiers APIThe Identifiers API from Shopify — 75 operation(s) for identifiers.60.4Datadog Identifiers APIThe Identifiers API from Datadog — 3 operation(s) for identifiers.57.1pVerify MBI Lookup APILook up a Medicare Beneficiary Identifier for a patient from demographic data, for providers who need the M...56.5Grafana Identifiers APIThe Identifiers API from Grafana — 12 operation(s) for identifiers.54.8Atlassian Identifiers APIThe Identifiers API from Atlassian — 6 operation(s) for identifiers.54.7
Developing 6 Usable, with meaningful gaps to close
PermID Entity Search APIRESTful API for searching and discovering organizations, equity instruments, and equity quotes using PermID...50.6PermID Record Matching APIRESTful API for matching unstructured entity records to PermID identifiers. Enables concordance by mapping ...50.6Symbology APIDiscovery Symbology API for concordance, navigation, and discovery of financial content. Enables mapping fr...50.6MusicBrainz Identifiers APINon-MBID lookups by ISRC, ISWC, and DiscID.44.3B3 ISIN APIISIN issuance and management for financial instruments - B3 is the Brazilian numbering agency - covering IS...43.4Corbado Identifiers APIManage login identifiers (email, phone, username) attached to a user.40.0
Thin 7 Limited public surface area
PMC ID Converter APIThe PMC ID Converter API translates between PubMed Central identifiers (PMCID), PubMed identifiers (PMID), ...38.6STRING Identifiers APIMap protein names and synonyms to STRING identifiers35.2Healthcare Identifiers (HI) ServiceThe national Healthcare Identifiers Service, providing unique identifiers for individuals (IHI), healthcare...33.9Terrain Discovery Environment API Identifiers APIPermanent identifier (DOI) requests33.6ROR REST APIThe ROR REST API provides programmatic access to the Research Organization Registry, enabling users to retr...31.9Otreeba Identifiers APIThe Identifiers API from Otreeba — 1 operation(s) for identifiers.28.4Asset Identifier Service (AIS)The USGS Asset Identifier Service (AIS) allows USGS personnel to reserve, register, publish, and manage USG...28.0
Emerging 8 Early or largely undocumented
Medrio Subjects APICreate, list, and update clinical trial subjects within a study; manage Medrio and study subject identifier...25.6Reactome identifiers APIQueries for multiple identifiers25.6GS1 Digital Link Resolver (id.gs1.org)GS1 AISBL's own live, unauthenticated GS1-Conformant Resolver, implementing the GS1-Conformant Resolver Sta...23.6ID Mapping REST APIMaps identifiers between UniProt accessions and over 150 external database identifiers (e.g., RefSeq, Ensem...21.4Lane API Identifiers APIThe Identifiers API from Lane API — 3 operation(s) for identifiers.21.1SpruceID Identifiers APIDID resolution implementing the W3C DID Resolution HTTP binding.18.4Sonyflake Distributed ID GeneratorSonyflake is a Go library producing 63-bit unique IDs inspired by Twitter's Snowflake but tuned for longer ...15.3Open Civic DataOpen Civic Data is a community-maintained set of specifications and shared identifiers for civic informatio...11.1

Score breakdown

Frequency
52.9
log-scaled weighted occurrences
Breadth
0.9
spread across providers
Quality lift
52.6
mean composite of providers using it
Cohesion
0.0
strength of nearest seed neighbor

Related tags

All 6 co-occurrences Type 6 co-occurrences Sets 6 co-occurrences Custom 6 co-occurrences Generate 6 co-occurrences Single 5 co-occurrences Cancel 6 co-occurrences External 6 co-occurrences

Where this tag comes from

Api tag34
Provider tag5
Openapi tag17
Openapi op tag128

Cohort brief

Auto-generated

The 34 providers in the APIs.io catalog tagged Identifiers, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers
34
all scored
Mean Kin Score
43.3
+22.6 vs catalog 20.7
Mean Agent Readiness
27.7
+18.0 vs catalog 9.7
Spread
11.1–83.3
median 39.3 · σ 18.9
How the 34 split by band
Exemplar 3Strong 10Developing 4Thin 9Emerging 8Minimal 0
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Contract Quality 53.9 17.5 +36.4 34
Developer Ergonomics 39.7 17.9 +21.8 34
Operational Transparency 32.5 11.3 +21.2 34
Contract Governance 19.5 6.4 +13.1 34
Access Clarity 35 22.3 +12.7 34
Discoverability 68.9 60.4 +8.5 34

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) 12% 7% +5
Agent Skills 0% 0% 0
OAuth scopes 29% 9% +20
Security 97% 88% +9
Arazzo workflows 26% 2% +24
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 Stripe 83.2
  3. 3 New Relic 68.8
  4. 4 Factset 64.8
  5. 5 Ordnance Survey 62.6
  6. 6 GitHub 62.4
  7. 7 Factiva 61.9
  8. 8 Zaius 61.7
  9. 9 Shopify 60.4
  10. 10 Datadog 57.1
Top by Agent Readiness
  1. 1 Factset 52.8
  2. 2 Salesforce 52.2
  3. 3 Stripe 47.8
  4. 4 GitHub 45.5
  5. 5 Factiva 43.3
  6. 6 Atlassian 41.9
  7. 7 Shopify 40.6
  8. 8 Datadog 38.3
  9. 9 U.S. Geological Survey 35.4
  10. 10 Ordnance Survey 34
All 34 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/identifiers"
All tags 
curl "https://apis.io/api/v1/tags?limit=25"
As a scored cohort 
curl "https://apis.io/api/v1/cohorts/tag/identifiers"
The distribution (Pro) 
curl "https://apis.io/api/v1/cohorts/tag/identifiers/stats" \
  -H "X-API-Key: $APIS_IO_KEY"

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