Textcortex

TextCortex is a Berlin-based AI writing and content-generation platform (ZenoChat assistant, knowledge bases, and a suite of writing tools) that also ships a public, OpenAI-compatible REST API. The API, served from https://api.textcortex.com/v1 with Bearer API-key authentication, exposes model discovery, chat completions, and an OpenAI Responses-compatible generation endpoint, plus an API-credit balance check. Streaming is supported over server-sent events and infrastructure is EU-hosted and GDPR-compliant. TextCortex is backed by Speedinvest and maintains first-party Python and JavaScript client libraries.

Textcortex publishes 4 APIs on the APIs.io network, including Balance API, Chat Completions API, Models API, and 1 more. Tagged areas include Company, Artificial Intelligence, Text Generation, LLM, and Chat Completions.

Textcortex’s developer surface includes authentication, support, pricing, signup flow, and 20 more developer resources.

🌐 Visit website 📡 Source on GitHub

34.0/100 thin ▬ flat Agent 37/100 agent ready Front door AI 6/6 dominant saas Full breakdown ↓
scored 2026-09-25 · rubric v0.23.0

1 APIs

Company Artificial Intelligence Text Generation LLM Chat Completions OpenAI-Compatible Content Generation Developer Tools

Kin Score

Kin Score How this is scored →
scored 2026-09-25 · rubric v0.23.0

Composite quality — 34.0/100 · thin

Contract Quality 9.6 / 19

Developer Ergonomics 6.0 / 15

Access Clarity 3.2 / 15

Operational Transparency 1.0 / 10

Contract Governance 0.4 / 9

Discoverability 5.5 / 8

Regulatory Posture 2.9 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 37/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 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 6 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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/textcortex: 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 →

Standards implemented 1

Interfaces this provider implements that became standards by being copied rather than ratified. Each is profiled by the API Commons, and the evidence column says how the claim was established — not that it was made.

The OpenAI Interface reaches extended

declared — publishes a spec that declares them

2 core of 338 operations graded · api-commons/models

APIs 4

Individual APIs this provider publishes, each with its own machine-readable definition.

Textcortex Balance API

Read API credit balance for the current API key.

Textcortex Chat Completions API

Generate chat completions with TextCortex models.

Textcortex Models API

Discover OpenAI-compatible TextCortex models.

Textcortex Responses API

Generate responses with TextCortex models.

Open Collections 5

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

TextCortex Balance API

OPEN COLLECTION

TextCortex Balance Chat Completions API

OPEN COLLECTION

TextCortex Balance Models API

OPEN COLLECTION

TextCortex Balance Responses API

OPEN COLLECTION

Security Posture 2

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

Textcortex Authentication

http · 1 scheme

SECURITY

Textcortex Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Textcortex Agentic Access

5 operations · 2 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

SignUp

SignUp

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

WellKnown

WellKnown

X-MCPServerCandidate

X-MCPServerCandidate

LLMsTxt

LLMsTxt

AgentSkill

AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conformance

ErrorCatalog

Lifecycle

Conventions

DataModel

Build 4

SDKs, sample code, and the tooling you integrate with

Packages

Packages

SDKs

SDKs

GitHubOrganization

GitHubOrganization

Postman

Postman

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

StatusPage

StatusPage

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

Company 1

The organization behind the API

Website

Website

Other 1

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

aid: textcortex
name: Textcortex
description: TextCortex is a Berlin-based AI writing and content-generation platform (ZenoChat assistant, knowledge bases,
  and a suite of writing tools) that also ships a public, OpenAI-compatible REST API. The API, served from https://api.textcortex.com/v1
  with Bearer API-key authentication, exposes model discovery, chat completions, and an OpenAI Responses-compatible generation
  endpoint, plus an API-credit balance check. Streaming is supported over server-sent events and infrastructure is EU-hosted
  and GDPR-compliant. TextCortex is backed by Speedinvest and maintains first-party Python and JavaScript client libraries.
url: https://raw.githubusercontent.com/api-evangelist/textcortex/refs/heads/main/apis.yml
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://docs.textcortex.com/logo192.png
x-type: company
x-source: vc-portfolio
x-backed-by:
- speedinvest
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Artificial Intelligence
- Text Generation
- LLM
- Chat Completions
- OpenAI-Compatible
- Content Generation
- Developer Tools
tags_raw:
- Company
- Artificial Intelligence
- Text Generation
- Large Language Models
- Chat Completions
- OpenAI-Compatible
- Content Generation
- Developer Tools
apis:
- aid: textcortex:textcortex-balance-api
  name: Textcortex Balance API
  description: Read API credit balance for the current API key.
  humanURL: https://docs.textcortex.com/
  baseURL: https://api.textcortex.com/v1
  tags:
  - Balances
  tags_raw:
  - Balance
  properties:
  - type: OpenAPI
    url: openapi/textcortex-balance-api-openapi.yml
  - type: Documentation
    url: https://docs.textcortex.com/
  - type: APIReference
    url: https://docs.textcortex.com/
  - type: GettingStarted
    url: https://help.textcortex.com/hc/en-us/articles/25546707607185-TextCortex-API-Deploy-AI-on-your-platform
- aid: textcortex:textcortex-chat-completions-api
  name: Textcortex Chat Completions API
  description: Generate chat completions with TextCortex models.
  humanURL: https://docs.textcortex.com/
  baseURL: https://api.textcortex.com/v1
  tags:
  - Chat Completions
  properties:
  - type: OpenAPI
    url: openapi/textcortex-chat-completions-api-openapi.yml
  - type: Documentation
    url: https://docs.textcortex.com/
  - type: APIReference
    url: https://docs.textcortex.com/
  - type: GettingStarted
    url: https://help.textcortex.com/hc/en-us/articles/25546707607185-TextCortex-API-Deploy-AI-on-your-platform
- aid: textcortex:textcortex-models-api
  name: Textcortex Models API
  description: Discover OpenAI-compatible TextCortex models.
  humanURL: https://docs.textcortex.com/
  baseURL: https://api.textcortex.com/v1
  tags:
  - Models
  properties:
  - type: OpenAPI
    url: openapi/textcortex-models-api-openapi.yml
  - type: Documentation
    url: https://docs.textcortex.com/
  - type: APIReference
    url: https://docs.textcortex.com/
  - type: GettingStarted
    url: https://help.textcortex.com/hc/en-us/articles/25546707607185-TextCortex-API-Deploy-AI-on-your-platform
- aid: textcortex:textcortex-responses-api
  name: Textcortex Responses API
  description: Generate responses with TextCortex models.
  humanURL: https://docs.textcortex.com/
  baseURL: https://api.textcortex.com/v1
  tags:
  - Responses
  properties:
  - type: OpenAPI
    url: openapi/textcortex-responses-api-openapi.yml
  - type: Documentation
    url: https://docs.textcortex.com/
  - type: APIReference
    url: https://docs.textcortex.com/
  - type: GettingStarted
    url: https://help.textcortex.com/hc/en-us/articles/25546707607185-TextCortex-API-Deploy-AI-on-your-platform
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://www.textcortex.com/
- type: DomainSecurity
  url: security/textcortex-domain-security.yml
- type: AgenticAccess
  url: agentic-access/textcortex-agentic-access.yml
- type: Authentication
  url: authentication/textcortex-authentication.yml
- type: Packages
  url: packages/textcortex-packages.yml
- type: SDKs
  url: packages/textcortex-packages.yml
- type: WellKnown
  url: well-known/textcortex-well-known.yml
- type: X-MCPServerCandidate
  url: mcp/textcortex-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: LLMsTxt
  url: llms/textcortex-llms.txt
- type: Overlay
  url: overlays/textcortex-openapi-overlay.yaml
- type: Conformance
  url: conformance/textcortex-conformance.yml
- type: ErrorCatalog
  url: errors/textcortex-problem-types.yml
- type: Lifecycle
  url: lifecycle/textcortex-lifecycle.yml
- type: StatusPage
  url: https://status.textcortex.com/
- type: Conventions
  url: conventions/textcortex-conventions.yml
- type: DataModel
  url: data-model/textcortex-data-model.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DeveloperPortal
  url: https://docs.textcortex.com/
- type: Support
  url: https://help.textcortex.com/
- type: GitHubOrganization
  url: https://github.com/textcortex
- type: Pricing
  url: https://textcortex.com/pricing
- type: TermsOfService
  url: https://textcortex.com/terms-of-services
- type: SignUp
  url: https://app.textcortex.com/
- type: Postman
  url: https://www.postman.com/textcortex/textcortex-text-generation-api/overview
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 18
  pass: local-v1

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