Loops
Loops is an email platform built for software companies, combining marketing campaigns, product and lifecycle automation, and transactional email on one contact model. Its REST API v1 exposes 64 operations across contacts, contact properties, mailing lists, audience segments, events and event patterns, campaigns, transactional emails, email messages authored in its own LMX markup, themes, components, uploads and workflow graphs, plus a 17-event signed webhook surface. Loops publishes its OpenAPI 3.1 document openly, ships first-party SDKs for JavaScript, Go, PHP, Ruby and Nuxt, a Go CLI, four versioned Agent Skills, and a hosted OAuth-protected MCP server at mcp.loops.so. Pricing is based on stored subscribed contacts rather than send volume, with a permanent free tier. The operating company is Astrodon Corporation.
Reference-quality API operations across every facet — a rich contract, published governance, transparent operations, and machine-readable commercial terms.
API Evangelist profiles Loops the way a machine reads it — 43 machine-readable artifacts across 1 API, 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 — Loops scores 69.1/100 (exemplar), with a separate agent-readiness read of 58/100 (agent native). 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
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How we profile Loops
Each block below is one kind of artifact we hold for Loops. 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 21
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.
Loops API key API
Validate a Loops API key and discover which team it belongs to. 1 operation(s) in the Loops REST API v1 (OpenAPI 1.21.6).
Loops Audience segments API
Read and create saved audience segments used to target campaigns and workflows. 3 operation(s) in the Loops REST API v1 (OpenAPI 1.21.6).
Loops Campaign groups API
Organize campaigns into groups. 4 operation(s) in the Loops REST API v1 (OpenAPI 1.21.6).
Loops Campaigns API
Create, target, schedule and update email campaigns. 4 operation(s) in the Loops REST API v1 (OpenAPI 1.21.6).
Loops Components API
Create, read and update reusable LMX email components. 4 operation(s) in the Loops REST API v1 (OpenAPI 1.21.6).
Loops Configuration API
Read team configuration, including dedicated sending IP addresses. 1 operation(s) in the Loops REST API v1 (OpenAPI 1.21.6).
Loops Contact properties API
Create and list the custom properties available on contacts. 2 operation(s) in the Loops REST API v1 (OpenAPI 1.21.6).
Loops Contacts API
Create, update, find and delete contacts, and manage suppression status. 6 operation(s) in the Loops REST API v1 (OpenAPI 1.21.6).
Loops Email messages API
Read, update, preview and Guardian-validate the LMX body of campaigns, workflow emails and transactional templates. 4 operation(s) in the Loops REST API v1 (OpenAPI 1.21.6).
Loops Event patterns API
Read the event patterns Loops has detected from incoming events, including their observed properties. 3 operation(s) in the Loops REST API v1 (OpenAPI 1.21.6).
Loops Events API
Send events that update contact activity and trigger published workflows. 1 operation(s) in the Loops REST API v1 (OpenAPI 1.21.6).
Loops Mailing lists API
List the mailing lists in your account. 1 operation(s) in the Loops REST API v1 (OpenAPI 1.21.6).
Loops Themes API
Create, read and update reusable email themes. 4 operation(s) in the Loops REST API v1 (OpenAPI 1.21.6).
Loops Transactional emails API
Create, edit, publish, list and send transactional email templates with data variables. 8 operation(s) in the Loops REST API v1 (OpenAPI 1.21.6).
Loops Transactional groups API
Organize transactional emails into groups. 4 operation(s) in the Loops REST API v1 (OpenAPI 1.21.6).
Loops Uploads API
Upload image assets for use in emails via a presigned-URL flow. 2 operation(s) in the Loops REST API v1 (OpenAPI 1.21.6).
Loops Workflow nodes API
Create, read, update, delete and reroute the nodes of a workflow graph. 7 operation(s) in the Loops REST API v1 (OpenAPI 1.21.6).
Loops Workflows API
List, create, inspect and update automation workflows and their mailing-list targeting. 5 operation(s) in the Loops REST API v1 (OpenAPI 1.21.6).
Loops MCP Server
Remote Model Context Protocol server for Loops, reachable at https://mcp.loops.so over Streamable HTTP with OAuth 2.0 (PKCE, scope "mcp"). Exposes four meta-tools — search, desc...
Loops Webhooks
Outbound event surface. Seventeen signed event types covering contact lifecycle, mailing-list membership, and email delivery, engagement and complaint signals, delivered by HTTP...
Loops Webhooks API
Events Loops sends to your configured webhook endpoint when certain events happen in your account. Configure an endpoint in Settings → Webhooks. Each account supports one webhoo...
Scroll within the panel for all 21 ·
Open Collections 12
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).
API Collection
OPEN COLLECTIONLoops OpenAPI Spec API key API
OPEN COLLECTIONLoops OpenAPI Spec API key Campaigns API
OPEN COLLECTIONLoops OpenAPI Spec API key Components API
OPEN COLLECTIONLoops OpenAPI Spec API key Contact properties API
OPEN COLLECTIONLoops OpenAPI Spec API key Contacts API
OPEN COLLECTIONLoops OpenAPI Spec API key Dedicated sending IPs API
OPEN COLLECTIONLoops OpenAPI Spec API key Email messages API
OPEN COLLECTIONLoops OpenAPI Spec API key Events API
OPEN COLLECTIONLoops OpenAPI Spec API key Mailing lists API
OPEN COLLECTIONLoops OpenAPI Spec API key Themes API
OPEN COLLECTIONLoops OpenAPI Spec API key Transactional emails API
OPEN COLLECTIONScroll within the panel for all 12 ·
MCP Servers 1
Model Context Protocol servers expose these APIs directly to AI agents. We profile them because agent-native access is the fastest-growing way this provider's capabilities actually get used.
Model Context Protocol servers that expose these APIs to AI agents.
Loops MCP Server
MCP SERVERPricing 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.
Loops Plans Pricing
PLANSRate 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.
Loops Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Loops Finops
FINOPSEvent Specifications 1
Not every API is request/response. AsyncAPI describes the event-driven and streaming side — the webhooks and channels — so the asynchronous half of the interface is documented the same way the synchronous half is.
AsyncAPI definitions for this provider's event-driven and streaming APIs.
Loops Webhooks
Event catalog for the Loops webhook surface, derived operation-for-operation from the `webhooks` block of the Loops OpenAPI 3.1 document (info.version 1.21.6, published at https...
ASYNCAPISecurity Posture 3
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.
Scopes 1
OAuth scopes are the vocabulary of least-privilege access. Profiling them shows exactly what an integration — or an agent acting on a user's behalf — is allowed to do.
OAuth scopes governing access to this provider's APIs.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for Loops — 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 5
Portal, sign-up, and the first successful call
Documentation 3
Reference material describing how the API behaves
Agent Surfaces 5
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 7
Pagination, idempotency, versioning, errors, and events
Scroll within the panel for all 7 ·
Build 6
SDKs, sample code, and the tooling you integrate with
Access & Security 5
Authentication, authorization, and security posture
Operate 4
Status, limits, changes, and where to get help
Commercial 6
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API
Other 2
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/loops · machine-readable index on apis.io
This is an independent, third-party profile of Loops, 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.
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