dottxt website screenshot

dottxt

dottxt (styled .txt) is the company behind Outlines, the open-source structured-generation library for LLMs with 65M+ downloads. Its hosted platform API (api.dottxt.ai) is an OpenAI-compatible Chat Completions endpoint that guarantees 100% schema-compliant model output by construction using constrained decoding: pass a JSON Schema via `response_format` and the model produces exactly that shape — no retries, no validation loops, no defensive parsing. Output can be streamed as token deltas (SSE) or field-by-field as RFC 6902 JSON Patch events. dottxt also ships self-hosted, drop-in replacements for vLLM, SGLang and TensorRT-LLM inference servers, and composable libraries (dotjson for JSON Schema, dotgrammar for context-free grammars, dotlambda for function calling). Backed by EQT Ventures and Seedcamp.

dottxt publishes 2 APIs on the APIs.io network: Chat API and Models API. Tagged areas include Company, Artificial Intelligence, LLM, Structured Outputs, and JSON Schema.

dottxt’s developer surface includes documentation, API reference, getting-started guide, signup flow, engineering blog, authentication, and 16 more developer resources.

46.6/100 developing ▬ flat Agent 65/100 agent native Full breakdown ↓
scored 2026-07-27 · rubric v0.5
AccessSelf serve
2 APIs 1 MCP Servers
CompanyArtificial IntelligenceLLMStructured OutputsJSON SchemaMachine LearningDeveloper ToolsConstrained Decoding

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 46.6/100 · developing
Contract Quality 15.9 / 25
Developer Ergonomics 13.9 / 20
Commercial Clarity 6.8 / 20
Operational Transparency 0.7 / 13
Governance 0.0 / 12
Discoverability 9.3 / 10
Agent readiness — 65/100 · agent native
Machine-Readable Contract 18 / 18
Agentic Access Contract 15 / 15
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 0 / 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
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/dottxt: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 2

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

dottxt Chat API

OpenAI-compatible chat completions with structured output.

dottxt Models API

Models available to your API key.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

dottxt-mcp.yml

MCP SERVER

Security Posture 2

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

Dottxt Authentication

http · 1 scheme

SECURITY

Dottxt Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Agentic Access 1

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

Dottxt Agentic Access

2 operations · 1 acting

2 operations · 1 acting

AGENTIC

Resources

Get Started 3

Portal, sign-up, and the first successful call

Documentation 2

Reference material describing how the API behaves

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Build 3

SDKs, sample code, and the tooling you integrate with

Access & Security 2

Authentication, authorization, and security posture

Commercial 2

Pricing, plans, and the legal terms of use

Company 1

The organization behind the API

Source (apis.yml)

apis.yml Raw ↑
aid: dottxt
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/dottxt.png
name: dottxt
description: 'dottxt (styled .txt) is the company behind Outlines, the open-source structured-generation library for LLMs
  with 65M+ downloads. Its hosted platform API (api.dottxt.ai) is an OpenAI-compatible Chat Completions endpoint that guarantees
  100% schema-compliant model output by construction using constrained decoding: pass a JSON Schema via `response_format`
  and the model produces exactly that shape — no retries, no validation loops, no defensive parsing. Output can be streamed
  as token deltas (SSE) or field-by-field as RFC 6902 JSON Patch events. dottxt also ships self-hosted, drop-in replacements
  for vLLM, SGLang and TensorRT-LLM inference servers, and composable libraries (dotjson for JSON Schema, dotgrammar for context-free
  grammars, dotlambda for function calling). Backed by EQT Ventures and Seedcamp.'
url: https://raw.githubusercontent.com/api-evangelist/dottxt/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- eqt-ventures
x-tier: enriched
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-18'
tags:
- Company
- Artificial Intelligence
- LLM
- Structured Outputs
- JSON Schema
- Machine Learning
- Developer Tools
- Constrained Decoding
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- aid: dottxt:dottxt-chat-api
  name: dottxt Chat API
  description: OpenAI-compatible chat completions with structured output.
  humanURL: https://docs.dottxt.ai/api/overview
  baseURL: https://api.dottxt.ai/v1
  tags:
  - Chat
  properties:
  - type: OpenAPI
    url: openapi/dottxt-chat-api-openapi.yml
  - type: Documentation
    url: https://docs.dottxt.ai
  - type: APIReference
    url: https://docs.dottxt.ai/api/overview
- aid: dottxt:dottxt-models-api
  name: dottxt Models API
  description: Models available to your API key.
  humanURL: https://docs.dottxt.ai/api/overview
  baseURL: https://api.dottxt.ai/v1
  tags:
  - Models
  properties:
  - type: OpenAPI
    url: openapi/dottxt-models-api-openapi.yml
  - type: Documentation
    url: https://docs.dottxt.ai
  - type: APIReference
    url: https://docs.dottxt.ai/api/overview
common:
- type: DeveloperPortal
  url: https://docs.dottxt.ai
- type: Documentation
  url: https://docs.dottxt.ai
- type: APIReference
  url: https://docs.dottxt.ai/api/overview
- type: GettingStarted
  url: https://docs.dottxt.ai/quickstart
- type: SignUp
  url: https://h1xbpbfsf0w.typeform.com/to/fwQNWmS8
- type: Blog
  url: https://blog.dottxt.ai/
- type: GitHubOrganization
  url: https://github.com/dottxt-ai
- type: TermsOfService
  url: https://dottxt.ai/terms-of-service
- type: PrivacyPolicy
  url: https://dottxt.ai/privacy-policy
- type: Authentication
  url: authentication/dottxt-authentication.yml
- type: Conventions
  url: conventions/dottxt-conventions.yml
- type: ErrorCatalog
  url: errors/dottxt-problem-types.yml
- type: Lifecycle
  url: lifecycle/dottxt-lifecycle.yml
- type: Conformance
  url: conformance/dottxt-conformance.yml
- type: Packages
  url: packages/dottxt-packages.yml
- type: SDKs
  url: packages/dottxt-packages.yml
- type: MCPServer
  url: mcp/dottxt-mcp.yml
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/dottxt-llms.txt
- type: DataModel
  url: data-model/dottxt-data-model.yml
- type: DomainSecurity
  url: security/dottxt-domain-security.yml
- type: AgenticAccess
  url: agentic-access/dottxt-agentic-access.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence