Variants seen in the corpus:
EmailemailВалидация Email
Providers using this tag (261)
Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.
Exemplar 40 Complete, well-documented, and agent-ready
BrevoCustomer.ioSalesforce Marketing CloudSalesforceAmazon PinpointMailchimpBrazeAmazon SESOneSignalSendGridKlaviyoNylasMoEngageSendPulseOptimizelyMapp Marketing CloudIterableBloomreachSMTP2GOAWeberMailboxlayerTwiliobeehiivLoopsVesselKnockOrttoButtondownHunterAdobe SuitePostmarkInfobipPlunkOutreachMoosendMailmodoAcousticMatomoNovuMicrosoft Outlook
Strong 44 Solid coverage with minor gaps
KeapSAP EmarsysCordialServiceNowBlueshiftMailerSendClickFunnelsApollo.ioDotdigitalExtoleThingSpeakBazaarvoiceCloudflareKPNDyspatchNutshellClearbit (HubSpot Breeze Intelligence)EmailOctopusLithiumRevenueBaseSalesloftMixRankWunderkindExclaimerMicrosoft GraphKickboxRB2BInsiderSalesflareKaleyraEnchargeMicrosoft AzureMicrosoft ExchangeRoute MobileGladlySoracomMarketoEvercontactStreet.co.ukZavuBluecoreGrafanaAgentMailAtlassian
Developing 61 Usable, with meaningful gaps to close
Uncodie (now Makinari)OptusNationBuilderAmazon WorkMailOracleVaultREAct-OnlistmonkAmazon SNSMixmaxNextivaStytchSuprSendNimbleZoomDescopeResendVerisoulFynoCustomerOSDealHubUnlock ProtocolHatchAhaSendMovable InkEmailRepHelp ScoutLendKeyuCheckerFrontAppMicrosoftGoogle WorkspaceGraviteeAptlyMicrosoft OfficeLoopsStackOneConversicaMastercardTwilio SegmentGoogle GmailGOV.UK NotifyBirdClimateAIKalturaAcquiaGreensparkSparkPostMissiveMagicBellFusionAuthSEONReturn PathOcean SecurityVal TownApache JamesAppgainFrontZoho MailSEDNATucows
Thin 52 Limited public surface area
MailjetStaffbaseZohoREALTOR.caXoxodayResourclySpree CommerceJeengClickSendMailtrapPurplebricksMailerooNotificationAPIQlikGlobal RelayTerminalFormspreeSourceHutMailPacePushmicrosoft-azure-communication-servicesWhippyORCIDcPanelMicrosoft 365Microsoft Office ApplicationsSonatype NexusMailgunMicrosoft Office SuiteSEONCloud CustodianMicrosoft Products APIsEngagespotSubstackCourierMicrosoft Office ProductsOpenproviderTerminusGoogle Workspace APIsMicrosoft SuiteGandiEmailEngineMicrosoft Office PackOffice 365KnockMacroArgo CDClickSend SMSNTT DocomoAgencyZoomVirtualminMicrosoft Applications APIs
Emerging 32 Early or largely undocumented
Opensense (formerly SenderGen)SuperhumanAirshipResulticksZimbraShortwavePushwooshLane APIDAS TechnologySupafaxBloomberg MessageSendinblueLavenderLiqPayLevityAmazon Web ServicesBuildiumAegisAIMicrosoft ApplicationsSpikeBuildforeverYampaNameSiloCloudflare.commxHeroSMTP410 LabsInboxNumeroAvecBoomerangINBOTIQA
Minimal 32 Almost no public developer surface
APIs with this tag (167)
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 25 Complete, well-documented, and agent-ready
Content Builder APIREST API for creating and manipulating marketing content in Content Builder, a single cross-channel reposit...Email Send Definition APIAPI for creating and managing email send definitions, which define the configuration for sending emails to ...Salesforce Marketing Cloud SOAP APIThe Salesforce Marketing Cloud SOAP API is a full-featured SOAP web service interface for Marketing Cloud t...Mailchimp Email APIThe Email API from Mailchimp — 3 operation(s) for email.Nylas APIThe Nylas v3 REST API provides programmatic access to email, calendar, contacts, meeting notetaking, schedu...MoEngage Campaigns APICreate, update, search, test, and publish Push and Email campaigns. The V5 draft lifecycle builds a campaig...MoEngage Content and Templates APICreate, update, and search reusable content across channels — email templates (V1 and V2), push templates, ...MoEngage Inform APIUnified transactional messaging infrastructure for building and managing transactional alerts across SMS, E...MoEngage Subscriptions APIManage email resubscription in bulk, update opt-in management preferences, and read, create, and update per...SendPulse Bulk Email APIMailing lists, email campaigns, templates, subscribers, senders, blacklist, balance and email-service webho...Optimizely Campaign REST APIEmail and omnichannel campaign management, formerly Episerver Campaign and optivo broadmail — mailings, sma...Mapp Engage APIThe Mapp Engage REST API (REST 2.0, incremental version v19) exchanges data between external systems and Ma...Iterable Email APISend transactional emails and manage email-specific delivery settings.Bloomreach Engagement APIREST API for the Bloomreach Engagement marketing automation and CDP platform, enabling customer tracking, s...SMTP2GO Email APIREST API for sending transactional emails and SMS, managing sender domains, SMTP users, API keys, templates...Loops MCP ServerRemote Model Context Protocol server for Loops, reachable at https://mcp.loops.so over Streamable HTTP with...Loops WebhooksOutbound event surface. Seventeen signed event types covering contact lifecycle, mailing-list membership, a...Vessel Marketing Automation Unified APIThe Vessel Marketing Automation Unified API normalizes marketing automation objects across Mailchimp, Activ...Buttondown Newsletter PlatformThe Buttondown hosted newsletter platform provides a markdown-based composition experience, subscriber mana...Adobe Campaign APIManage marketing campaigns, deliveries, workflows, subscriptions, and profiles through REST APIs for cross-...Postmark Email APIThe Email API from Postmark — 4 operation(s) for email.Infobip Email APIInfobip Email is a cloud-based, all-in-one communication solution suited for both transactional and marketi...Plunk APIPlunk's own published OpenAPI 3.1.0, served at https://docs.useplunk.com/openapi.json and declaring https:/...Mailmodo Dynamic Form APITrigger a campaign whose AMP email carries a form generated at runtime from the request payloadMatomo ScheduledReports APIThe Matomo ScheduledReports API exposes 6 operations of the Matomo Reporting API (module `ScheduledReports`...
Strong 40 Solid coverage with minor gaps
Keap Email APIKeap Email API — 10 operations across 8 paths on the Keap REST v2 contract, read from Keap's own published ...SAP Emarsys Conditional Text Rules APIIn this batch you may find endpoints related to conditional text rules. Published by SAP Emarsys as a Swagg...SAP Emarsys Email Campaign Lifecycle APIIn this batch you may find endpoints related to email campaign lifecycle. Published by SAP Emarsys as a Swa...SAP Emarsys Email Campaigns APIIn this batch you may find endpoints related to email campaigns. Published by SAP Emarsys as a Swagger 2.0 ...SAP Emarsys Email Templates APIIn this batch you may find endpoints related to email templates. Published by SAP Emarsys as a Swagger 2.0 ...SAP Emarsys Sections APIIn this batch you may find endpoints related to sections. Published by SAP Emarsys as a Swagger 2.0 documen...SAP Emarsys Tracked Links APIIn this batch you may find endpoints related to tracked links. Published by SAP Emarsys as a Swagger 2.0 do...ServiceNow Email APIThe ServiceNow Email API provides REST endpoints for sending email messages from the Now Platform. It allow...MailerSend APIMailerSend API v1 provides RESTful endpoints for sending emails (single, bulk, scheduled), templates, domai...MailerSend Email APIThe Email API from MailerSend — 1 operation(s) for email.ClickFunnels APIThe ClickFunnels 2.0 REST API — 418 operations across 230 paths and 102 resource tags, covering the whole p...Apollo.io Emailer Messages APIOne-off email drafting, sending, send status and content retrieval. 4 operation(s) from the published Apoll...Dotdigital v2 APIThe legacy v2 REST framework, still the only home for many capabilities — email and SMS campaigns, programs...Extole Email APIThe Email API from Extole — 7 operation(s) for email.ThingSpeak Alerts APISend email alerts from a channel via the alerts API or React, and retrieve alert history. Useful for enviro...Bazaarvoice Notifications Subscriptions APIThe Notifications Subscriptions API manages shopper email subscription state for Bazaarvoice notification e...Cloudflare Email Routing APIThe Cloudflare Email Routing API enables developers to create and manage custom email addresses and routing...KPN Email-to-SMS APIConverts inbound email into SMS messages delivered over the KPN network. Documented on the KPN Developer po...Registered Email API (via KPN)This API offers three functionalities: - User management - Emailing User management can be used to add, get...Nutshell Emails APIIndividual email messages recorded against Nutshell records. 1 operation(s) across 1 path(s).Clearbit Risk APIScores an email address for fraud and abuse risk. Endpoint /v1/calculate?email=. Verified live 2026-08-13 (...Lithium Email APIThe Email API from Lithium — 1 operation(s) for email.RevenueBase Email APIThe Email API from RevenueBase — 2 operation(s) for email.MixRank Email APIThe Email API from MixRank — 4 operation(s) for email.Wunderkind Email APIEmail sending operationsRB2B Enrichment APICredit-metered Enrichment endpoints that take a known identifier — hashed email (MD5), plaintext email, or ...Insider One Analytics APIEmail campaign lists, campaign statistics and overall analytics (v1 and v2 side by side), plus OnSite campa...Insider One Contact APIPer-channel subscription state and first-party segment upload. v1 unsubscribes from the channel database; v...Insider One Mail APITransactional email sending (9,000 requests/second) with dynamic fields, attachments and customer-supplied ...Kaleyra Email APISend single and batch transactional email (Email API v2) with domain management, templates, webhooks, and d...Encharge Email Templates APIThe Email Templates API from Encharge — 9 operation(s) for creating and versioning email templates.Encharge Transactional Email APIREST API for sending transactional emails through Encharge. Accepts JSON at POST /v1/emails/send with exact...Microsoft Azure Communication Services APIAzure Communication Services provides multichannel communication APIs that enable developers to add voice, ...SendClean Email APISendClean is Route Mobile's transactional and bulk email product, exposed as a JSON-over-HTTP-POST REST API...Soracom Email API[Email addresses](/en/docs/email/)Marketo Email APIThe Email API from Marketo — 31 operation(s) for email.Spectre APIThe public API for the Spectre products, documented on the Street.co.uk developer portal and integrated int...Bluecore Transactional API (legacy)The original Bluecore Transactional API on https://api.bluecore.com/email/ - send a transactional or real-t...Grafana Email APIThe Email API from Grafana — 3 operation(s) for email.Atlassian Email APIThe Email API from Atlassian — 2 operation(s) for email.
Developing 36 Usable, with meaningful gaps to close
Makinari Agents APIPer-agent HTTP endpoints — 48 documented operations under /api/agents/* covering chat (including a WebSocke...Optus SMS Suite REST Email APICompanion REST API to the SMS gateway for scheduling and sending plain-text transactional email over a sepa...OCI Email Delivery APIREST APIs for sending high-volume and application-generated emails through Oracle Cloud Infrastructure, wit...VaultRE APIThe core VaultRE REST API - the open API a third-party developer integrates an agency website or applicatio...VaultRE Integrator APIA distinct set of endpoints that operate at the integrator level rather than at an individual agency-accoun...Nextiva Workitem Service APIRetrieve and control workitems — the unit of work in the Nextiva Contact Center — and the calls attached to...Stytch Email APIThe Email API from Stytch — 3 operation(s) for email.Nimble Messages APIMessage drafts — list and create draft messages. 2 operation(s).Zoom Mail APIThe Zoom Mail API enables developers to programmatically access and manage mailbox data including draft man...Descope Email APIThe Email API from Descope — 10 operation(s) for email.Resend Email APIThe Email API from Resend — 3 operation(s) for email.Verisoul Email APIThe Email API from Verisoul — 1 operation(s) for email.CustomerOS Flow API34-operation REST API for outbound sequencing — flows, sequences, steps (email, LinkedIn or manual), sender...DealHub Subskribe APIThe subscription management, usage-based billing and revenue recognition API DealHub acquired with Subskrib...Unlock Protocol Email APIThe Email API from Unlock Protocol — 3 operation(s) for email.AhaSend Email APIAPIs for sending emailsLendKey email APIThe email API from LendKey — 2 operation(s) for email.uChecker Валидация Email APIПроверка email-адресов, управление задачами валидации, получение и скачивание результатовMicrosoft Email APISend email messagesGmail APISend and read email, manage drafts and labels, and handle mailbox settings.Gmail Postmaster Tools APIGather statistics on bulk emails sent to Gmail users including spam reports and delivery errors.Gravitee email APIThe email API from Gravitee — 4 operation(s) for email.Aptly Email APIThe Email API from Aptly — 2 operation(s) for email.Outlook Mail APIAPI for accessing and managing email, calendar, contacts, and tasks in Outlook.StackOne Unified Marketing APIStackOne Unified Marketing API standardizes campaign management across platforms, streamlining messages (SM...Mastercard Email APIThe Email API from Mastercard — 2 operation(s) for email.Segment Pixel Tracking APIThe Segment Pixel Tracking API provides a way to collect analytics data using image pixel requests, which i...ClimateAI Email APIemail sending operationsKaltura email APIThe email API from Kaltura — 1 operation(s) for email.Acquia Email APIThe Email API from Acquia — 1 operation(s) for email.Greenspark Email APIThe Email API from Greenspark — 14 operation(s) for email.FusionAuth Email APIThe Email API from FusionAuth — 5 operation(s) for email.SEON Email APIThe Email API from SEON — 1 operation(s) for email.Apache James JMAP APIThe JMAP (JSON Meta Application Protocol) implementation in James provides a modern, efficient email protoc...Appgain Notify APIThe messaging send service. A single POST /{projectId}/send endpoint whose channel is selected by the top-l...OpenSRS Email API (OMA)The OpenSRS Mail API is the provisioning interface for the OpenSRS hosted email system — create, modify and...
Thin 37 Limited public surface area
Zoho MailThe Zoho Mail REST API allows developers to fetch email conversations and integrate Zoho Mail into applicat...REALTOR.ca DDF Lead APIThe DDF® Lead API accepts an email lead for a REALTOR® from a downstream site. Because member email address...Xoxoday Reward Links APIAPI for creating and sending personalized reward links via email, SMS, or chat. Supports campaign managemen...Resourcly email APIThe email API from Resourcly — 1 operation(s) for email.Spree Klaviyo IntegrationOfficial Klaviyo marketing-platform integration for Spree - syncs customers, orders, and product events to ...Jeeng Email Monetization — Advertisers APIAdvertiser-side campaign management and reporting for the Jeeng / OpenWeb Email Monetization platform. Upda...Jeeng Email Monetization — Publishers APIPublisher-side inventory reporting for the Jeeng / OpenWeb Email Monetization platform. Retrieve container ...ClickSend Email APISend and view transactional email.Purplebricks Communications APIOutbound and inbound communication service covering the contact-us surface, customer emails and TPS (Teleph...Qlik Email Configuration APIManages email transport configuration for sending notifications and reports from Qlik Cloud.Global Relay Email APIEndpoints for archiving email messagesTerminal Email APIThe Email API from Terminal — 1 operation(s) for email.lists.sr.ht GraphQL APIGraphQL API for managing mailing lists and email-based code review workflows on SourceHut, powered by git s...microsoft-azure-communication-services Email APIThe Email API from microsoft-azure-communication-services — 1 operation(s) for email.ORCID Email APIThe Email API from ORCID — 1 operation(s) for email.cPanel Email APIEmail account management (Email module)cPanel UAPIThe cPanel User API (UAPI) is the modern HTTP API for performing cPanel-level operations such as managing e...Outlook Mail APIAPI for accessing and managing email in Outlook.Sonatype Nexus Email APIThe Email API from Sonatype Nexus — 2 operation(s) for email.Outlook API (Office.js)JavaScript API for building add-ins and automating Microsoft Outlook.SEON Email APIThe SEON Email API is a standalone email enrichment tool that helps identify the approximate minimum age of...SEON Email APIThe Email API from SEON — 1 operation(s) for email.Cloud Custodian C7n-Mailerc7n-mailer is a Cloud Custodian notification tool that subscribes to an SQS queue populated by policy actio...Office 365 APIsAPIs for Office 365 applications including Outlook, Calendar, Contacts, and Files.Engagespot Notifications APIThe Engagespot REST API enables sending multi-channel notifications to users, listing and deleting notifica...Openprovider Email APIThe Email API from Openprovider — 2 operation(s) for email.Outlook JavaScript APIAPI for building Outlook add-ins for email, calendar, and contacts.Employee Automation APIA dedicated service that streamlines management of users and employee signature data inside an Email Experi...Verify APIEmail verification API — single-address real-time validation and asynchronous CSV batch verification, sold ...Outlook Mail APIAccess to Outlook mail, calendar, contacts, and tasks via Microsoft Graph.Gandi Email APIThe Gandi Email API allows you to manage email accounts and mailboxes.Outlook Mail APIAPI for accessing and managing email messages, calendars, and contacts.Outlook Mail APIAccess email, manage folders, send mail, and manage mail settings via Microsoft Graph.Argo CD Notifications APIThe Argo CD Notifications subsystem delivers app lifecycle events (sync, health, deploy) to webhooks, Slack...docomo Mail IMAP InterfaceThe docomo Mail IMAP interface is the one machine-interface specification NTT DOCOMO publishes openly, with...AgencyZoom Email APIThe Email API from AgencyZoom — 2 operation(s) for email.Outlook Mail APIAPI for accessing and managing email messages through Microsoft Outlook.
Emerging 14 Early or largely undocumented
Airship Email & SMS APISend email and SMS messages alongside push.Pushwoosh Messaging APISend push notifications, email, SMS and in-app messages to user audiences.Lane API Email APIThe Email API from Lane API — 7 operation(s) for email.DAS Web APIThe DAS Web API (DASWebAPI) is DAS Technology's REST API for the CDXP platform, served from api.digitalairs...Bloomberg Email GatewayGateway service enabling Bloomberg IB messages to be sent and received via email for communication with cou...SendinblueA service that provides solutions relating to marketing and/or transactional email and/or SMSLiqPay Invoice APIAPI for generating and sending payment invoices to customers by email or phone number. Invoices include ite...Amazon Web Services Email APIThe Email API from Amazon Web Services — 96 operation(s) for email.Buildium Communications APIManages emails, notes, and other communications stored against properties, leases, tenants, owners, and ven...Office 365 APIAPIs for Office 365 services including Outlook, OneDrive, and SharePoint.Outlook Mail APIAccess and manage email, calendar, and contacts in Outlook.mxHERO Mail2Cloud Advanced (AI Email Knowledge)AI email knowledge-recovery service. Captured company email is optimized and stored in an isolated per-tena...Mailgun Email APIMailgun provides a programmable email API for sending, receiving, tracking, and validating email at scale. ...Nylas Email APINylas exposes a unified REST API for email, calendar, contacts, and scheduling across Google, Microsoft, iC...
Minimal 15 Almost no public developer surface
Postfix SMTPPostfix implements SMTP (RFC 5321) for sending and receiving electronic mail, with submission (port 587), S...PostStackEU-hosted email API for transactional and marketing email, with contacts, broadcasts, and analyticsImprovMXAPI for free email forwarding serviceCloudmersive ValidateValidate email addresses, phone numbers, VAT numbers and domain namesDisifyValidate and detect disposable and temporary email addressesDropMailGraphQL API for creating and managing ephemeral e-mail inboxesEmail ValidationValidate email addresses for deliverability and spamEmailJSSend emails directly from client-side JavaScript without a backend serverEVAValidate email addressesGuerrilla MailDisposable temporary Email addressesmail.gw10 Minute Mailmail.tmTemporary Email ServiceMailboxValidatorValidate email address to improve deliverabilityMailCheck.aiPrevent users to sign up with temporary email addressesVerifierVerifies that a given email is real
Score breakdown
Frequency
70.8
log-scaled weighted occurrences
Breadth
7.2
spread across providers
Quality lift
51.1
mean composite of providers using it
Cohesion
19.0
strength of nearest seed neighbor
Related tags
SMS 64 co-occurrences
Transactional Email 31 co-occurrences
Messaging 72 co-occurrences
Marketing Automation 37 co-occurrences
Contacts 52 co-occurrences
Campaigns 41 co-occurrences
Templates 38 co-occurrences
Message 35 co-occurrences
Where this tag comes from
Provider tag169
Api tag162
Openapi tag41
Openapi op tag136
Cohort brief
Auto-generatedThe 261 providers in the APIs.io catalog tagged Email, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.
Providers
261
all scored
Mean Kin Score
42.2
+21.5 vs catalog 20.7
Mean Agent Readiness
25.4
+15.7 vs catalog 9.7
Spread
4.1–87.3
median 43.9 · σ 21.9
How the 261 split by band
Exemplar 40Strong 44Developing 61Thin 52Emerging 32Minimal 32
Facet averages, against the whole catalog
| Facet | This cohort | Catalog | Difference | Scored |
|---|---|---|---|---|
| Contract Quality | 44 | 17.5 | +26.5 | 261 |
| Access Clarity | 46 | 22.3 | +23.7 | 261 |
| Developer Ergonomics | 40.9 | 17.9 | +23 | 261 |
| Operational Transparency | 32.1 | 11.3 | +20.8 | 261 |
| Discoverability | 71 | 60.4 | +10.6 | 261 |
| Contract Governance | 15.4 | 6.4 | +9 | 261 |
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
| Artifact | This cohort | Catalog | Difference |
|---|---|---|---|
| MCP server (any) | 42% | 16% | +26 |
| MCP server (first-party) | 26% | 7% | +19 |
| Agent Skills | 0% | 0% | 0 |
| OAuth scopes | 28% | 9% | +19 |
| Security | 96% | 88% | +8 |
| Arazzo workflows | 10% | 2% | +8 |
| Governance rules | 28% | 13% | +15 |
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 Brevo 87.3
- 2 Customer.io 87.3
- 3 Salesforce Marketing Cloud 83.5
- 4 Salesforce 83.3
- 5 Amazon Pinpoint 83.1
- 6 Mailchimp 81.5
- 7 Braze 81.2
- 8 Amazon SES 79.7
- 9 OneSignal 78.3
- 10 SendGrid 77
Top by Agent Readiness
- 1 Cordial 62.9
- 2 Adobe Suite 61.5
- 3 MoEngage 59.4
- 4 OneSignal 59.2
- 5 Knock 58.6
- 6 Bloomreach 58.5
- 7 Loops 57.8
- 8 Extole 57.2
- 9 Mapp Marketing Cloud 56.3
- 10 Salesforce Marketing Cloud 56.2
All 261 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
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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.
Call it yourself
curl for this page
This tag
curl "https://apis.io/api/v1/tags/email"
All tags
curl "https://apis.io/api/v1/tags?limit=25"
As a scored cohort
curl "https://apis.io/api/v1/cohorts/tag/email"
The distribution (Pro)
curl "https://apis.io/api/v1/cohorts/tag/email/stats" \
-H "X-API-Key: $APIS_IO_KEY"Discovery needs no key. Ratings and market analysis are Pro.