Return Path
Return Path is an email-deliverability and inbox-intelligence brand that pioneered sender reputation, inbox-placement monitoring, and email fraud protection for marketers and email senders. Founded in 1999 and backed by Sapphire Ventures and Union Square Ventures, Return Path was acquired by Validity in 2019 and now ships as the Validity Everest email-success platform; returnpath.com 301-redirects to validity.com. The platform draws on signals from billions of global mailboxes to measure inbox placement, sender reputation, and deliverability across major mailbox providers. The Return Path product line's surviving API surface is the Everest API at api.everest.validity.com — 170 published operations across inbox placement, sender reputation and Sender Score, blocklist and spam-trap monitoring, DMARC infrastructure reporting, engagement analytics, list validation and certification. Validity publishes no OpenAPI, but it does publish a complete public Postman collection at developer.everest.validity.com, which is the machine-readable contract this profile is built from.
Real signal across most facets with visible, nameable gaps — the contract exists but is thin, or the portal is good while governance and commercial terms are absent.
API Evangelist profiles Return Path the way a machine reads it — 18 machine-readable artifacts across 11 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 — Return Path scores 42.6/100 (developing), with a separate agent-readiness read of 34/100 (agent ready). 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 Return Path
Each block below is one kind of artifact we hold for Return Path. 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 11
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.
Return Path Account Services API
The Account Services API from Return Path — 13 operation(s) for account services.
Return Path Apps & Integrations API
The Apps & Integrations API from Return Path — 12 operation(s) for apps & integrations.
Return Path Certification API
The Certification API from Return Path — 2 operation(s) for certification.
Return Path Competitive Intel API
The Competitive Intel API from Return Path — 7 operation(s) for competitive intel.
Return Path Engagement API
The Engagement API from Return Path — 35 operation(s) for engagement.
Return Path Inbox Placement API
The Inbox Placement API from Return Path — 17 operation(s) for inbox placement.
Return Path Infrastructure (DMARC) API
The Infrastructure (DMARC) API from Return Path — 10 operation(s) for infrastructure (dmarc).
Return Path Legacy API (1.0) API
The Legacy API (1.0) API from Return Path — 6 operation(s) for legacy api (1.0).
Return Path List Validation API
The List Validation API from Return Path — 6 operation(s) for list validation.
Return Path Reputation API
The Reputation API from Return Path — 18 operation(s) for reputation.
Return Path View Time Optimization API
The View Time Optimization API from Return Path — 4 operation(s) for view time optimization.
Scroll within the panel for all 11 ·
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.
Return Path Rate Limits
RATE LIMITSEvent 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.
Return Path Webhooks
ASYNCAPISecurity 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.
Return Path Trust Center
SOC 2 Type 2, ISO/IEC 27001, ISO/IEC 27701, GDPR, CCPA, EU-US Data Privacy Framework, Microsoft SSPA, Standard Contractual Clauses
SECURITYResources
Every other property we hold for Return Path — 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 2
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 2
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 6
Pagination, idempotency, versioning, errors, and events
Build 2
SDKs, sample code, and the tooling you integrate with
Access & Security 9
Authentication, authorization, and security posture
Scroll within the panel for all 9 ·
Operate 4
Status, limits, changes, and where to get help
Commercial 3
Pricing, plans, and the legal terms of use
Company 2
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/return-path · machine-readable index on apis.io
This is an independent, third-party profile of Return Path, 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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