Exclaimer
Exclaimer is an email signature management platform used by IT, marketing, and sales teams to centrally create, deploy, and govern corporate email signatures across Microsoft 365, Microsoft Exchange, and Google Workspace. It manages signatures for more than 9 million email accounts, adding campaign banners, meeting-branding backgrounds, click-tracking analytics, directory synchronization with Azure AD and Google Directory, and role-based access control. Exclaimer publishes the Exclaimer Cloud API — a partner/distributor provisioning REST API documented at cloudapi.exclaimer.com with a machine- readable OpenAPI 3.0.1 definition covering subscriptions, MSP subscriptions, subscription users, resellers, end users, mailbox counts, subscription transfers and reference data. It operates a multi-region Exclaimer Cloud with a real-time status page and a strong security and compliance program (SOC 2 Type II, ISO 27001/27018, HIPAA, PCI DSS, CSA STAR, Cyber Essentials).
Solid contracts, transparent operations, and an easy start — typically complete on four or five facets with one clear soft spot.
API Evangelist profiles Exclaimer the way a machine reads it — 24 machine-readable artifacts across 10 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Exclaimer scores 61.1/100 (strong), with a separate agent-readiness read of 29/100 (agent aware). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-08 · rubric v0.20.0
Put this on your own site. The badge is drawn live from Exclaimer's current Kin Score — paste it once and it updates itself every time the score is recomputed. It follows your visitor's light or dark setting, and it links back here so anyone who sees it can read the full breakdown.
<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/exclaimer/"
title="Exclaimer on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/exclaimer.svg"
alt="Exclaimer Kin Score — API readiness rating by API Evangelist" width="150" height="150" loading="lazy">
</a>[](https://providers.apievangelist.com/providers/exclaimer/)<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/exclaimer/"
title="Exclaimer on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/exclaimer/card.svg"
alt="Exclaimer Kin Score — API readiness rating by API Evangelist" width="340" height="120" loading="lazy">
</a>More shapes, themes and sizes → · Score as JSON · How badges work
How we profile Exclaimer
Each block below is one kind of artifact we hold for Exclaimer. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 9
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Exclaimer End Users API
The End Users API from Exclaimer — 1 operation(s) for end users.
Exclaimer Mailboxes API
The Mailboxes API from Exclaimer — 1 operation(s) for mailboxes.
Exclaimer Miscellaneous API
The Miscellaneous API from Exclaimer — 2 operation(s) for miscellaneous.
Exclaimer MSP API
The MSP API from Exclaimer — 4 operation(s) for msp.
Exclaimer Reference Resources API
The Reference Resources API from Exclaimer — 3 operation(s) for reference resources.
Exclaimer Resellers API
The Resellers API from Exclaimer — 1 operation(s) for resellers.
Exclaimer Subscription Transfers API
The Subscription Transfers API from Exclaimer — 3 operation(s) for subscription transfers.
Exclaimer Subscription Users API
The Subscription Users API from Exclaimer — 4 operation(s) for subscription users.
Exclaimer Subscriptions API
The Subscriptions API from Exclaimer — 13 operation(s) for subscriptions.
Scroll within the panel for all 9 ·
Open Collections 9
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
Exclaimer Cloud API — End Users
OPEN COLLECTIONExclaimer Cloud API — Mailboxes
OPEN COLLECTIONExclaimer Cloud API — Miscellaneous
OPEN COLLECTIONExclaimer Cloud API — MSP
OPEN COLLECTIONExclaimer Cloud API — Reference Resources
OPEN COLLECTIONExclaimer Cloud API — Resellers
OPEN COLLECTIONExclaimer Cloud API — Subscription Transfers
OPEN COLLECTIONExclaimer Cloud API — Subscription Users
OPEN COLLECTIONExclaimer Cloud API — Subscriptions
OPEN COLLECTIONScroll within the panel for all 9 ·
Pricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the things the Kin Score reads for access clarity — renamed from commercial clarity in rubric 0.12, because a free statutory interface has access terms and no commercial ones.
Published pricing tiers and plan structures.
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Exclaimer Rate Limits
RATE LIMITSSecurity Posture 4
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Exclaimer Trust Center
SOC 2 Type II, ISO/IEC 27001, ISO/IEC 27018, PCI DSS, CSA (Cloud Security Alliance), Cyber Essentials, HIPAA, GDPR, CCPA
SECURITYResources
Every other property we hold for Exclaimer — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 3
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 3
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 1
Pagination, idempotency, versioning, errors, and events
Build 1
SDKs, sample code, and the tooling you integrate with
Access & Security 6
Authentication, authorization, and security posture
Operate 5
Status, limits, changes, and where to get help
Commercial 4
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
Other 1
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/exclaimer · machine-readable index on apis.io
This is an independent, third-party profile of Exclaimer, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
info@apievangelist.com
·
Read the full data-sourcing policy →
On a security or compliance team? Put security in the subject line and
you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.