Epsilon
Epsilon is a Publicis Groupe marketing and advertising technology company that operates identity-led, data-driven marketing across paid, owned and earned channels. Its public, machine-readable API surface sits almost entirely inside Epsilon Retail Media (the platform built on CitrusAd, which Publicis acquired in 2021 and folded into Epsilon), whose developer hub at developers.citrusad.com publishes an Integration API for syncing catalogs, products, customers and orders and for generating product, banner and Banner X ads; a Filter Mapping API; a Cross-Sell Category API; and a Brand Pages API served from regional *.rmn.dotomi.com hosts. Epsilon also runs Epsilon PeopleCloud (loyalty, CRM, digital media) and CORE Private Exchange for publishers, but neither publishes a public machine-readable contract. API access is provisioned by a Technical Account Manager rather than self-service signup.
Limited machine-readable signal and partial portal coverage — documentation a human can read, but little a machine or agent can consume without scraping.
API Evangelist profiles Epsilon the way a machine reads it — 11 machine-readable artifacts across 4 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 — Epsilon scores 40.5/100 (thin), with a separate agent-readiness read of 43/100 (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.
Kin Score
How this is scored →scored 2026-08-17 · rubric v0.11.0
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How we profile Epsilon
Each block below is one kind of artifact we hold for Epsilon. 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 4
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.
Epsilon Retail Media Integration API
The core Epsilon Retail Media (CitrusAd) REST API. Retailers use it to sync product catalogs, catalog products, customers and order data into the platform, and to request produc...
Epsilon Retail Media Brand Pages API
Serves brand-page content modules for retailer-hosted brand landing pages. A retailer routes /brands/{slug} on its own domain, calls POST /ads/v3/brand-pages on its assigned reg...
Epsilon Retail Media Filter Mapping API
Manages filter mappings that translate a retailer's own product filter vocabulary into the filters Epsilon Retail Media applies when selecting ads. Five operations — create, lis...
Epsilon Retail Media Cross-Sell Category API
Manages cross-sell category definitions used by the category cross-sell ad placement, where ads for one category are shown against products in a different, related category. Fou...
Open Collections 3
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).
CrossSellCategory API
OPEN COLLECTIONCitrus filter-mapping API
OPEN COLLECTIONEpsilon Retail Media Integration API
OPEN COLLECTIONPricing 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 six things the Kin Score reads for commercial clarity.
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.
Epsilon Rate Limits
RATE LIMITSSecurity Posture 2
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.
Resources
Every other property we hold for Epsilon — 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 3
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 3
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 5
Pagination, idempotency, versioning, errors, and events
Build 1
SDKs, sample code, and the tooling you integrate with
Access & Security 2
Authentication, authorization, and security posture
Operate 2
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 1
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/epsilon · machine-readable index on apis.io
This is an independent, third-party profile of Epsilon, 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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