# Yieldify (Epsilon Accelerate)

> Yieldify is a website personalization and conversion-rate-optimization platform for ecommerce
> brands, founded in London in 2013 and acquired by Publicis Groupe in January 2023, where it is
> now sold as Epsilon Accelerate. It is delivered as a managed SaaS service through a single
> JavaScript tag placed on the customer's site; campaigns are built and configured in the
> Yieldify Conversion Platform (YCP). **Yieldify publishes no public API** — no REST/OpenAPI
> surface, no GraphQL endpoint, no MCP server, no webhooks, no SDKs, and no developer portal.
> Integration is client-side only.

This file was GENERATED by API Evangelist from the public Yieldify/Epsilon surface and the
artifacts in this repository. Yieldify does not publish an llms.txt of its own (probed
2026-08-13: 404 on yieldify.com, www.yieldify.com and support.yieldify.com; convert.yieldify.com
answers 200 with an SPA shell for every path, which is not a document).

## What exists instead of an API

- Client-side JavaScript tag, placed before `</head>`, installed directly or via Google Tag
  Manager, Tealium, Shopify `theme.liquid`/`checkout.liquid`, or Recharge checkout.
- A documented library of on-site experience components (overlays, notifications, banners, sticky
  and embedded experiences, toasters, carousels, countdown timers, forms, CTAs).
- A typed dynamic-expression language for personalizing copy: `var<number>("basket.value")`,
  `++` concatenation, `if / else if / else`.
- Client-side analytics events emitted into the customer's own Google Analytics / GA4 property:
  `yieldify_impression`, `yieldify_click`, `yieldify_close`, `yieldify_form_submit`.
- Outbound ESP/analytics connectors configured in the platform (Mailchimp, Campaign Monitor,
  Google Analytics, GA4, Klaviyo).

## Docs

- [Epsilon Accelerate Help Center for Yieldify](https://support.yieldify.com/en/): the complete
  public documentation, 137 articles across 13 collections
- [Implementation](https://support.yieldify.com/en/collections/2887588-implementation): tag
  installation, tag managers, CSP requirements
- [Campaign Formats and Components](https://support.yieldify.com/en/collections/2887594-campaign-formats-and-components)
- [Integrations](https://support.yieldify.com/en/collections/2896275-integrations)
- [Targeting & Triggering](https://support.yieldify.com/en/collections/2887598-targeting-triggering)
- [Performance](https://support.yieldify.com/en/collections/2887601-performance)
- [Policies](https://support.yieldify.com/en/collections/2887602-policies)

## Product

- [Epsilon Accelerate](https://www.epsilon.com/us/products-and-services/accelerate)
- [Yieldify Conversion Platform (login)](https://convert.yieldify.com/)
- [Yieldify blog](https://www.yieldify.com/blog/) — legacy; last post sitemap update 2023-06-30

## Policies

- [Yieldify Platform Policy](https://support.yieldify.com/en/articles/5245139-yieldify-platform-policy)
- [Data Collection Policy](https://support.yieldify.com/en/articles/5144108-data-collection-policy) (version dated 27/05/2026)
- [Data Subject Rights](https://support.yieldify.com/en/articles/9557077-data-subject-rights) — access and erasure self-served in YCP, 24-hour fulfilment
- [Cookie Policy](https://support.yieldify.com/en/articles/5245157-cookie-policy)

## API Evangelist artifacts in this repository

- `components/yieldify-components.yml` — the client-side component surface, loader, CSP hosts,
  expression language and analytics events
- `conformance/yieldify-conformance.yml` — data-protection posture and standards assessment
- `lifecycle/yieldify-lifecycle.yml` — product lifecycle after the Epsilon acquisition and the
  decay of the public web surface
- `plans/yieldify-plans-pricing.yml` — no published pricing (contact sales)
- `packages/yieldify-packages.yml` — no first-party packages in any registry
- `well-known/yieldify-well-known.yml` — 46 probed paths, zero provider-served documents
- `security/yieldify-domain-security.yml` — TLS/DNS posture

## Not present (probed 2026-08-13, all negative)

- OpenAPI / Swagger: no document on any host
- GraphQL: no endpoint
- MCP server: none published, none derivable (no API to derive from)
- A2A agent card: none (`/.well-known/agent-card.json` and `/.well-known/agent.json` return either
  404 or an HTML SPA shell)
- Webhooks / AsyncAPI: no event subscription surface
- SDKs / CLI / sandbox / changelog / status page: none published; the status page at
  status.yieldify.com is deactivated