Semasio

Semasio is a Hamburg, Germany advertising-technology company whose semantic targeting platform builds audience, contextual and brand-fit segments for brands, agencies and DSPs across roughly 30 languages and 50 countries. Founded in 2010, it was acquired in 2022 by Casters Holdings, Inc. operating under the Fyllo brand; the combined business traded as Fyllo|Semasio, rebranded to Semasio in April 2024, and was acquired by Samba TV on 31 October 2024. Products include Audience Targeting, Audience Extension, Contextual Targeting, ContextualPLUS, Brand Fit, Interactive Screens, HypertailPMP and the Semasio Factory data onboarding and modeling service. Semasio operates a login-only platform (uip.semasio.net) behind an authentik single sign-on host and publishes no public developer program, API reference, SDK or machine-readable specification.

Semasio is profiled on the APIs.io network. Tagged areas include Company, Advertising, Marketing, AdTech, and Audience Targeting.

Semasio’s developer surface includes engineering blog, support, and 12 more developer resources.

🌐 Visit website 📡 Source on GitHub

10.6/100 minimal ▬ flat Agent 3/100 human only saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

0 APIs

Company Advertising Marketing AdTech Audience Targeting Contextual Advertising Data Segments Programmatic

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 10.6/100 · minimal

Contract Quality 0.0 / 25

Developer Ergonomics 1.4 / 20

Access Clarity 4.2 / 20

Operational Transparency 0.0 / 13

Contract Governance 0.0 / 12

Discoverability 5.0 / 10

Agent readiness — 3/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/fyllo: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Pricing Plans 1

Published pricing tiers and plan structures.

Fyllo Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Fyllo Rate Limits

0 limits

RATE LIMITS

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Fyllo Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

Conformance

Conformance

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

Support

Support

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 5

The organization behind the API

Website

Blog

Newsroom

About

LinkedIn

Other 1

Properties that don't map to a standard resource type

SecondaryMarketListing

SecondaryMarketListing

Source (apis.yml)

aid: fyllo
name: Semasio
description: Semasio is a Hamburg, Germany advertising-technology company whose semantic targeting platform builds audience,
  contextual and brand-fit segments for brands, agencies and DSPs across roughly 30 languages and 50 countries. Founded in
  2010, it was acquired in 2022 by Casters Holdings, Inc. operating under the Fyllo brand; the combined business traded as
  Fyllo|Semasio, rebranded to Semasio in April 2024, and was acquired by Samba TV on 31 October 2024. Products include Audience
  Targeting, Audience Extension, Contextual Targeting, ContextualPLUS, Brand Fit, Interactive Screens, HypertailPMP and the
  Semasio Factory data onboarding and modeling service. Semasio operates a login-only platform (uip.semasio.net) behind an
  authentik single sign-on host and publishes no public developer program, API reference, SDK or machine-readable specification.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - rate-limits
  - security
  generated: '2026-09-02'
  method: derived
image: https://cdn.prod.website-files.com/65f445b220ec08022f24d171/661d908d87157eb6fe65f1bd_opengraph-global.png
url: https://raw.githubusercontent.com/api-evangelist/fyllo/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
x-tier: stub
x-tier-reason: harvest
specificationVersion: '0.23'
created: '2026-08-16'
modified: '2026-08-16'
tags:
- Company
- Advertising
- Marketing
- AdTech
- Audience Targeting
- Contextual Advertising
- Data
- Segments
- Programmatic
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/fyllo-domain-security.yml
- type: Conformance
  url: conformance/fyllo-conformance.yml
- type: LLMsTxt
  url: llms/fyllo-llms.txt
- type: Plans
  url: plans/fyllo-plans-pricing.yml
- type: RateLimits
  url: rate-limits/fyllo-rate-limits.yml
- type: Website
  url: https://www.semasio.com/
- type: Blog
  url: https://www.semasio.com/resources/blog
- type: Support
  url: https://www.semasio.com/contact/general
- type: TermsOfService
  url: https://www.semasio.com/legal/terms-and-conditions
- type: PrivacyPolicy
  url: https://www.semasio.com/legal/semasio-privacy-policy
- type: Newsroom
  url: https://www.semasio.com/company/newsroom
- type: About
  url: https://www.semasio.com/company/about
- type: LinkedIn
  url: https://www.linkedin.com/company/semasio/
- type: SecondaryMarketListing
  url: https://forgeglobal.com/fyllo_stock/
x-enrichment:
  date: '2026-08-16'
  status: minimal
  artifacts_added: 6
  pass: local-v1
x-coverage:
  state: none
  reason: no-developer-program
  detail: Semasio's entire 324-page sitemap is marketing, legal, case-study and podcast content with no developer, API or
    documentation path, and the only non-marketing hosts it operates — the uip.semasio.net platform UI, which serves a disallow-all
    robots.txt, and an authentik single sign-on at auth.semasio.net — return 404 for every OpenAPI, GraphQL, MCP and agent-card
    path probed.
  evidence:
  - url: https://www.semasio.com/sitemap.xml
    status: 200
  - url: https://uip.semasio.net/openapi.json
    status: 404
  - url: https://uip.semasio.net/graphql
    status: 404
  - url: https://www.semasio.com/.well-known/agent-card.json
    status: 404
  - url: https://www.semasio.com/llms.txt
    status: 404
  checked: '2026-08-16'

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