Cosuno
Cosuno is an AI‑based tendering platform for the construction industry in Germany, Austria and Switzerland. It connects clients and subcontractors, offering over 4,000 private/commercial tenders per month from 600+ clients, helping contractors win jobs with AI‑assisted bid creation and delivering average cost savings of 5‑7%.
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 Cosuno the way a machine reads it — 28 machine-readable artifacts across 1 API, 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 — Cosuno scores 35.9/100 (thin), with a separate agent-readiness read of 32/100 (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. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-10-17 · rubric v0.24.0
Put this on your own site. The badge is drawn live from Cosuno's current Kin Score — paste it once and it updates itself every time the score is recomputed. It follows your visitor's light or dark setting, and it links back here so anyone who sees it can read the full breakdown.
<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/cosuno/"
title="Cosuno on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/cosuno.svg"
alt="Cosuno Kin Score — API readiness rating by API Evangelist" width="150" height="150" loading="lazy">
</a>[](https://providers.apievangelist.com/providers/cosuno/)<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/cosuno/"
title="Cosuno on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/cosuno/card.svg"
alt="Cosuno Kin Score — API readiness rating by API Evangelist" width="340" height="120" loading="lazy">
</a>More shapes, themes and sizes → · Score as JSON · How badges work
How we profile Cosuno
Each block below is one kind of artifact we hold for Cosuno. 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 17
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.
Cosuno Awarded Bids API
The Awarded Bids API from Cosuno — 1 operation(s) for awarded bids.
Cosuno Bid Package Custom Fields API
The Bid Package Custom Fields API from Cosuno — 2 operation(s) for bid package custom fields.
Cosuno Bid Packages API
The Bid Packages API from Cosuno — 14 operation(s) for bid packages.
Cosuno Bid Requests API
The Bid Requests API from Cosuno — 10 operation(s) for bid requests.
Cosuno Bids API
The Bids API from Cosuno — 9 operation(s) for bids.
Cosuno Company API
The Company API from Cosuno — 7 operation(s) for company.
Cosuno Current User API
The Current User API from Cosuno — 1 operation(s) for current user.
Cosuno Offices API
The Offices API from Cosuno — 2 operation(s) for offices.
Cosuno Project Costs API
The Project Costs API from Cosuno — 2 operation(s) for project costs.
Cosuno Project Custom Fields API
The Project Custom Fields API from Cosuno — 2 operation(s) for project custom fields.
Cosuno Projects API
The Projects API from Cosuno — 13 operation(s) for projects.
Cosuno Subcontractor Custom Fields API
The Subcontractor Custom Fields API from Cosuno — 2 operation(s) for subcontractor custom fields.
Cosuno Subcontractor Reviews API
The Subcontractor Reviews API from Cosuno — 2 operation(s) for subcontractor reviews.
Cosuno Subcontractors API
The Subcontractors API from Cosuno — 4 operation(s) for subcontractors.
Cosuno Users API
The Users API from Cosuno — 3 operation(s) for users.
Cosuno Webhooks API
The Webhooks API from Cosuno — 2 operation(s) for webhooks.
Cosuno Work Categories API
The Work Categories API from Cosuno — 1 operation(s) for work categories.
Scroll within the panel for all 17 ·
Semantic Vocabularies 1
JSON-LD contexts give the data shared meaning across APIs. We profile them because semantics are what let a machine reconcile 'customer' here with 'customer' somewhere else.
JSON-LD contexts and semantic vocabularies used across these APIs.
Cosuno Context
JSON-LDSpectral Rules 1
Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.
Cosuno API Rules
SPECTRALJSON Schema 6
Standalone JSON Schema definitions describe the data models behind the API. We profile them so the shapes are validatable on their own — useful long after a single request is forgotten.
Standalone JSON Schema definitions for this provider's data models.
BidPackageResponse
JSON SCHEMACreateSubcontractorInput
JSON SCHEMAProjectResponse
JSON SCHEMASubcontractorResponse
JSON SCHEMAUpdateSubcontractorInput
JSON SCHEMAUpsertSubcontractorInput
JSON SCHEMASecurity 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.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for Cosuno — 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.
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 4
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 6
Pagination, idempotency, versioning, errors, and events
Access & Security 3
Authentication, authorization, and security posture
Commercial 1
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
Other 2
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/cosuno · machine-readable index on apis.io
This is an independent, third-party profile of Cosuno, 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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