emerging · 0.6

Inbox

Score 22.3 / 100 29 providers 26 APIs Search apis.io →
Variants seen in the corpus: Inboxinbox

Providers using this tag (29)

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

Exemplar 1 Complete, well-documented, and agent-ready
NovuNotificationMessagingIn AppEmail1 API72.1
Strong 2 Solid coverage with minor gaps
lemlistEmail OutreachSales EngagementCold EmailSales Automation3 APIs65.0VendastaCompanySoftware-as-a-ServiceMarketplaceSMB31 APIs60.9
Developing 16 Usable, with meaningful gaps to close
GovlyCompanyGovernmentPublic SectorProcurement1 API52.8AgentMailCompanyArtificial IntelligenceEmailAI Agents1 API51.4KU LeuvenUniversityHigher EducationEducationBelgium3 APIs50.8OrderfulCompanyEDIElectronic Data InterchangeSupply Chain1 API50.7AgicapCompanyCash ManagementTreasuryPayments19 APIs50.6Université de MontréalUniversityHigher EducationEducationCanada1 API50.6DelineaPrivileged Access ManagementPAMSecrets ManagementIdentity Security1 API49.5PersistIQCompanySales EngagementSalesOutbound2 APIs48.9DialectCompanyInfrastructureWeb3Blockchain3 APIs48.6RiotCybersecuritysecurity-awarenesshuman-risk-managementphishing-simulation2 APIs47.7MagicBellNotificationpush notificationsin-app notificationsEmail1 API47.3Maastricht UniversityUniversityHigher EducationEducationNetherlands10 APIs47.1University of GroningenEducationHigher EducationUniversityNetherlands2 APIs46.8University of GöttingenUniversityHigher EducationEducationGermany3 APIs46.2SAP BI ToolsAnalyticsBusiness IntelligenceData VisualizationReporting4 APIs45.9TestmailEmail TestingDeveloper ToolsAPI TestingGraphQL1 API44.5
Thin 7 Limited public surface area
FrontCustomer-SupportEmailCustomer Operations2 APIs39.1UCLouvainUniversityHigher EducationEducationBelgium1 API38.5CourierNotificationEmailSMSPush1 API32.9Norwegian University of Science and TechnologyEducationHigher EducationUniversityResearch7 APIs31.1University of North Carolina at Chapel HillEducationHigher EducationUniversityPublic Research University10 APIs29.5Queen's University at KingstonUniversityHigher EducationEducationCanada3 APIs29.3University of ChileEducationHigher EducationUniversityResearch Data1 API28.0
Emerging 3 Early or largely undocumented
PrimitiveCompany1 API24.9UpdoxHealthcarePatient EngagementSecure MessagingElectronic Fax1 API24.6InboxEmailMessagingDeliverability2 APIs21.4

APIs with this tag (16)

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
Novu Inbox / In-App APIClient-side API and React Inbox component for rendering an embedded in-app notification center, marking not...72.1
Strong 1 Solid coverage with minor gaps
lemlist Inbox APIThe unified reply inbox - conversations, messages, drafts, labels and sending on email, LinkedIn and WhatsApp.65.0
Developing 10 Usable, with meaningful gaps to close
Govly Inbox APIRead and triage the authenticated user's matched inbox items.52.8KU Leuven Inbox APIThe Inbox API from KU Leuven — 1 operation(s) for inbox.50.8Orderful Inbox APIRetrieve transactions from inboxes.50.7Agicap Inbox APIThe Inbox API from Agicap — 1 operation(s) for inbox.50.6Delinea Inbox APIInboxController49.5PersistIQ Replies APIThe Replies API from PersistIQ — 1 operation(s) for replies.48.9Dialect Inbox APIThe Inbox API from Dialect — 17 operation(s) for inbox.48.6Riot Inbox APIThe Inbox API from Riot — 3 operation(s) for inbox.47.7SAP BI Tools Inbox APIManage BI Inbox items including viewing received reports and scheduled instances.45.9Testmail Inbox APIRetrieve test emails from programmable inboxes44.5
Thin 2 Limited public surface area
Courier Inbox Real-Time APIWebSocket service that delivers Inbox messages and message-state events (read, unread, opened, archived, cl...32.9University of Chile Inbox APIThe Inbox API from University of Chile — 1 operation(s) for inbox.28.0
Emerging 2 Early or largely undocumented
Primitive Inbox APICheck inbound email setup and processing readiness24.9Updox Document Management APICreate, retrieve, and route documents within the Updox inbox, with Document Management webhooks for documen...24.6

Score breakdown

Frequency
48.4
log-scaled weighted occurrences
Breadth
0.8
spread across providers
Quality lift
50.2
mean composite of providers using it
Cohesion
0.0
strength of nearest seed neighbor

Related tags

Pids 10 co-occurrences Mydata 10 co-occurrences Metadatablocks 10 co-occurrences Datatags 10 co-occurrences Builtin Users 10 co-occurrences replaceFilesInDataset 9 co-occurrences addGlobusFilesToDataset 9 co-occurrences addFilesToDataset 9 co-occurrences

Where this tag comes from

Provider tag4
Api tag26
Openapi tag20
Openapi op tag61

Cohort brief

Auto-generated

The 29 providers in the APIs.io catalog tagged Inbox, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers
29
all scored
Mean Kin Score
41.8
+21.1 vs catalog 20.7
Mean Agent Readiness
30.8
+21.1 vs catalog 9.7
Spread
13.4–68.3
median 43.3 · σ 13.7
How the 29 split by band
Exemplar 2Strong 3Developing 11Thin 10Emerging 3Minimal 0
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Contract Quality 53.5 17.5 +36 29
Operational Transparency 33.5 11.3 +22.2 29
Access Clarity 41.6 22.3 +19.3 29
Developer Ergonomics 29.7 17.9 +11.8 29
Discoverability 70.6 60.4 +10.2 29
Contract Governance 16.5 6.4 +10.1 29

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) 34% 16% +18
MCP server (first-party) 17% 7% +10
Agent Skills 0% 0% 0
OAuth scopes 21% 9% +12
Security 100% 88% +12
Arazzo workflows 10% 2% +8
Governance rules 55% 13% +42

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 lemlist 68.3
  2. 2 Novu 66.6
  3. 3 Vendasta 63.3
  4. 4 Govly 54.9
  5. 5 AgentMail 54.7
  6. 6 Orderful 53.8
  7. 7 Agicap 53.2
  8. 8 PersistIQ 51.9
  9. 9 KU Leuven 50.7
  10. 10 Riot 50.7
Top by Agent Readiness
  1. 1 Primitive 75.2
  2. 2 lemlist 63.9
  3. 3 AgentMail 45.7
  4. 4 Agicap 45.5
  5. 5 Riot 38.7
  6. 6 PersistIQ 35.8
  7. 7 Govly 35.7
  8. 8 Vendasta 34.3
  9. 9 Dialect 34.2
  10. 10 Novu 34.2
All 29 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.

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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.
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Call it yourself

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This tag 
curl "https://apis.io/api/v1/tags/inbox"
All tags 
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As a scored cohort 
curl "https://apis.io/api/v1/cohorts/tag/inbox"
The distribution (Pro) 
curl "https://apis.io/api/v1/cohorts/tag/inbox/stats" \
  -H "X-API-Key: $APIS_IO_KEY"

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