# Return Path

**Canonical:** https://apis.io/providers/return-path/  
**Website:** https://www.returnpath.com/  
**APIs profiled:** 1

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.

## Kin Score — 52.2 / 100 (developing)

Scored 2026-08-17 under rubric 0.11.0. Trend: rising (+39.3 from 12.9).

| Facet | Score |
|---|---|
| Discoverability | 75.9 |
| Contract Quality | 66.1 |
| Governance | 20.8 |
| Operational Transparency | 39.5 |
| Developer Ergonomics | 52.2 |
| Commercial Clarity | 50.0 |

## Agent readiness — 51.8 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | no |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | verified |
| OpenAPI Examples | verified |
| Rate Limit Signal | documented |
| Event Surface Described | yes |
| Agent Skills | yes |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Enterprise, contact sales — onboarding: approval, pricing: enterprise, trial: no (confidence: medium).

## APIs (1)

- **Everest API** — The Everest API by Validity — the Return Path platform's surviving programmable surface. Two live major versions behind one host: /api/2.0 is current and covers inbox placement ...

## Security (4)

- **Return Path Authentication** — apiKey · 1 scheme
- **Return Path Domain Security** — TLSv1.3 · HSTS · DMARC
- **Return Path Vulnerability Disclosure** — Hackerone · contact published
- **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

## Plans (1)

- **Return Path Plans Pricing**

## Tags

Company, Martech, Email, Email Deliverability, Email Marketing, Sender Reputation, Inbox Placement, Deliverability, DMARC, Email Authentication, Email Validation, Analytics

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/return-path/). Scores are computed from the provider's own public artifacts under a published rubric.