aid: sailthru
name: Sailthru
description: 'Sailthru is a cross-channel relationship-marketing and personalization
  platform built for media, publishing, retail and e-commerce brands, unifying email,
  SMS, mobile push, in-app and on-site messaging around a single customer profile
  with predictive segmentation and 1:1 content personalization. Founded in New York
  in 2008, it was acquired by CM Group (later Marigold) in 2018 and became part of
  Zeta Global in November 2025 when Zeta bought Marigold''s enterprise software business;
  the product is now documented as Sailthru by Zeta. Its public HTTPS API lives at
  api.sailthru.com and covers users, lists, content, templates, blasts (campaigns),
  transactional sends, triggers, purchases, events, includes, ad plans and stats,
  authenticated with an api_key plus an MD5 signature computed over the request parameters.
  It is complemented by the Zephyr template language, a JavaScript on-site personalization
  tag, mobile SDKs, and API postbacks (webhooks) for opt-out, hardbounce, verify and
  profile-update events.'
image: https://zetaglobal.com/wp-content/uploads/2025/12/ZetaMarigold-Landing-page-images-09-1.png
url: https://raw.githubusercontent.com/api-evangelist/sailthru/refs/heads/main/apis.yml
x-type: company
x-source: harvest:marketing-integration-graph
x-tier: profiled
x-tier-reason: enrichment
x-parent-company: 'Zeta Global Holdings Corp. (NYSE: ZETA)'
specificationVersion: '0.20'
created: '2026-08-12'
modified: '2026-08-12'
tags:
- Company
- Email Marketing
- Marketing Automation
- Personalization
- Customer Data Platform
- Transactional Email
- SMS
- Push Notifications
- Retail
- Media and Publishing
apis:
- aid: sailthru:sailthru-api
  name: Sailthru API
  description: 'The core Sailthru HTTPS API. All requests are GET, POST or DELETE
    calls to https://api.sailthru.com/<endpointName>, authenticated with api_key,
    an MD5 sig over the sorted parameter values, and a format parameter (json or xml).
    Endpoints cover user profiles, lists, content, templates, blasts (campaigns),
    transactional send, trigger, purchase, event, include, ad-plan, preview, settings,
    stats and bulk job operations.'
  humanURL: https://products.zetaglobal.com/sailthru/Content/developers/api-basics/introduction.html
  baseURL: https://api.sailthru.com
  tags:
  - Email Marketing
  - Transactional Email
  - Marketing Automation
  - Personalization
  properties:
  - type: Documentation
    url: https://products.zetaglobal.com/sailthru/Content/developers/overview.html
  - type: APIReference
    url: https://products.zetaglobal.com/sailthru/Content/developers/api-basics/introduction.html
  - type: GettingStarted
    url: https://products.zetaglobal.com/sailthru/Content/developers/api-basics/technical.html
  - type: Authentication
    url: authentication/sailthru-authentication.yml
  - type: RateLimits
    url: rate-limits/sailthru-rate-limits.yml
  - type: ErrorCatalog
    url: errors/sailthru-error-codes.yml
  - type: Conventions
    url: conventions/sailthru-conventions.yml
  - type: Webhooks
    url: asyncapi/sailthru-postbacks-webhooks.yml
- aid: sailthru:sailthru-js-api
  name: Sailthru JavaScript API (Personalization Engine)
  description: 'The client-side Sailthru JavaScript tag (spm.v1.min.js, served from
    ak.sail-horizon.com) used for on-site behavior tracking, content-library sync,
    userSignUp/userSignUpConfirm calls and on-site personalization. It is the browser
    counterpart to the server-side API and is loaded as a script rather than called
    over REST.'
  humanURL: https://products.zetaglobal.com/sailthru/Content/developers/api-client/javascript.html
  baseURL: https://ak.sail-horizon.com
  tags:
  - Personalization
  - JavaScript
  - Web
  properties:
  - type: Documentation
    url: https://products.zetaglobal.com/sailthru/Content/developers/api-client/javascript.html
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: TrustCenter
  url: security/sailthru-trust-center.yml
- type: DomainSecurity
  url: security/sailthru-domain-security.yml
- type: VulnerabilityDisclosure
  url: security/sailthru-vulnerability-disclosure.yml
- type: Security
  url: https://bugcrowd.com/engagements/cheetah-vdp
- type: Compliance
  url: https://trust.zetaglobal.com/?product=sailthru
- type: Website
  url: https://zetaglobal.com/sailthru/
- type: DeveloperPortal
  url: https://products.zetaglobal.com/sailthru/Content/developers/overview.html
- type: Documentation
  url: https://products.zetaglobal.com/sailthru/Content/LandingPage.htm
- type: APIReference
  url: https://products.zetaglobal.com/sailthru/Content/developers/api-basics/introduction.html
- type: GettingStarted
  url: https://products.zetaglobal.com/sailthru/Content/developers/api-basics/technical.html
- type: Support
  url: https://zetaglobal.com/about/contact-us/
- type: Blog
  url: https://zetaglobal.com/resource-center/
- type: GitHubOrganization
  url: https://github.com/sailthru
- type: SignUp
  url: https://my.sailthru.com/
- type: TermsOfService
  url: https://zetaglobal.com/former-marigold-now-zeta-services-agreement/
- type: PrivacyPolicy
  url: https://zetaglobal.com/privacy-policy
- type: ChangeLog
  url: https://products.zetaglobal.com/sailthru/Content/ReleaseNotes/releasenotes-2026.htm
- type: ChangeLog
  url: changelog/sailthru-changelog.yml
- type: Packages
  url: packages/sailthru-packages.yml
- type: SDKs
  url: packages/sailthru-packages.yml
- type: CLI
  url: cli/sailthru-cli.yml
- type: Components
  url: components/sailthru-components.yml
- type: Authentication
  url: authentication/sailthru-authentication.yml
- type: Conventions
  url: conventions/sailthru-conventions.yml
- type: ErrorCatalog
  url: errors/sailthru-error-codes.yml
- type: RateLimits
  url: rate-limits/sailthru-rate-limits.yml
- type: Plans
  url: plans/sailthru-plans-pricing.yml
- type: Lifecycle
  url: lifecycle/sailthru-lifecycle.yml
- type: Conformance
  url: conformance/sailthru-conformance.yml
- type: Webhooks
  url: asyncapi/sailthru-postbacks-webhooks.yml
- type: LLMsTxt
  url: llms/sailthru-llms.txt
x-enrichment:
  date: '2026-08-12'
  status: enriched
  artifacts_added: 17
  pass: local-v1
x-coverage:
  state: covered
  reason: null
  detail: >-
    Documentation is public, server-rendered and fully readable at
    products.zetaglobal.com/sailthru; seventeen artifacts were harvested from it
    and from live probes. The one genuine gap is machine-readable contract —
    Sailthru publishes no OpenAPI, AsyncAPI, GraphQL, MCP or /.well-known/
    surface anywhere.
  checked: '2026-08-12'
x-vouched-by:
- Lytics
- Persado
- Simon Data
- mParticle
x-vouch-count: 4