MOSTLY AI website screenshot

MOSTLY AI

MOSTLY AI provides a synthetic data platform for high-fidelity, privacy-safe tabular data. It ships an open-source Python SDK (mostlyai, Apache 2.0) that runs in LOCAL mode for on-prem training or CLIENT mode against the hosted MOSTLY AI Platform, plus a REST API used by both the SDK and the web app. The SDK is powered by the TabularARGN model architecture and supports differential privacy.

MOSTLY AI publishes 10 APIs on the APIs.io network, including About API, Computes API, Connectors API, and 7 more. Tagged areas include Synthetic Data, Privacy, Tabular, Differential Privacy, and Python SDK.

MOSTLY AI’s developer surface includes authentication, documentation, GitHub presence, engineering blog, and 12 more developer resources.

🌐 Visit website 📡 Source on GitHub
37.5/100 thin ▬ flat Agent 22/100 agent aware open core · Apache-2.0 Full breakdown ↓
scored 2026-09-14 · rubric v0.22.0
AccessFreeSelf serve⚡ Free to try
1 APIs
Synthetic DataPrivacyTabularDifferential PrivacyPython SDKRESTApache 2.0

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-14 · rubric v0.22.0
Composite quality — 37.5/100 · thin
Contract Quality 10.1 / 20
Developer Ergonomics 5.0 / 16
Access Clarity 4.6 / 16
Operational Transparency 4.4 / 10
Contract Governance 0.0 / 10
Discoverability 5.5 / 8
Open Source Surface 5.0 / 10
Create-or-Update Ergonomics 0.0 / 10
Agent readiness — 22/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
Documented Reversibility 6 / 6
MCP Server 0 / 12
Machine-Readable Auth 10 / 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
Open Source Surface applies to this provider. This product is open source and we read its repository directly, so Open Source Surface carries 10 points of the composite. It is scored from what the repository actually publishes — a security policy, a contribution guide, a release history, a code of conduct — read live from the provider rather than inferred from our own catalog pointers. This facet adds; nothing was taken away to make room for it. An open-source project is not excused from the commercial facets, because exemption would strip it of the points it does earn. If we have the wrong repository, or this product is not open source, say so on your provider repo and we will drop the facet rather than have you publish against 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 80 points between them, because the conditional facet above carries the other 20. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 80% 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/mostly-ai: 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 →

APIs 12

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

MOSTLY AI REST API

REST API for the hosted MOSTLY AI Platform. Lets you manage connectors, generators, synthetic datasets, and runs. API keys are issued from the user profile menu in the web appli...

MOSTLY AI Synthetic Data SDK

Open-source Python SDK (mostlyai, Apache 2.0) for training generators and producing synthetic data. Runs in LOCAL mode on user compute or CLIENT mode against the MOSTLY AI Platf...

MOSTLY AI About API

The About API from MOSTLY AI — 1 operation(s) for about.

MOSTLY AI Computes API

The Computes API from MOSTLY AI — 2 operation(s) for computes.

MOSTLY AI Connectors API

The Connectors API from MOSTLY AI — 7 operation(s) for connectors.

MOSTLY AI Datasets API

The Datasets API from MOSTLY AI — 2 operation(s) for datasets.

MOSTLY AI Generators API

The Generators API from MOSTLY AI — 10 operation(s) for generators.

MOSTLY AI Models API

The Models API from MOSTLY AI — 1 operation(s) for models.

MOSTLY AI Organizations API

The Organizations API from MOSTLY AI — 3 operation(s) for organizations.

MOSTLY AI Synthetic Datasets API

The Synthetic Datasets API from MOSTLY AI — 5 operation(s) for synthetic datasets.

MOSTLY AI Synthetic Probes API

The Synthetic Probes API from MOSTLY AI — 1 operation(s) for synthetic probes.

MOSTLY AI Users API

The Users API from MOSTLY AI — 4 operation(s) for users.

Scroll for all 12

Open Collections 12

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

API Collection

OPEN COLLECTION

MOSTLY AI Platform REST About API

OPEN COLLECTION

MOSTLY AI Platform REST About Computes API

OPEN COLLECTION

MOSTLY AI Platform REST About Connectors API

OPEN COLLECTION

MOSTLY AI Platform REST About Datasets API

OPEN COLLECTION

MOSTLY AI Platform REST About Generators API

OPEN COLLECTION

MOSTLY AI Platform REST About Models API

OPEN COLLECTION

MOSTLY AI Platform REST About Organizations API

OPEN COLLECTION

MOSTLY AI Platform REST About Synthetic Datasets API

OPEN COLLECTION

MOSTLY AI Platform REST About Synthetic Probes API

OPEN COLLECTION

MOSTLY AI Platform REST About Users API

OPEN COLLECTION

MOSTLY AI Platform REST API

OPEN COLLECTION

Scroll for all 12

Pricing Plans 1

Published pricing tiers and plan structures.

Mostly Ai Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Mostly Ai Rate Limits

2 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Mostly Ai Finops

FINOPS

Security Posture 2

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

Mostly Ai Authentication

apiKey · 1 scheme

SECURITY

Mostly Ai Domain Security

TLSv1.3

SECURITY

Agentic Access 1

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

Mostly Ai Agentic Access

48 operations · 23 acting

48 operations · 23 acting

AGENTIC

Resources

Documentation 3

Reference material describing how the API behaves

ContributionGuide
ContributionGuide
 Documentation
Documentation
 APIDocs
APIDocs

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHub
GitHub

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 3

Status, limits, changes, and where to get help

IssueTracker
IssueTracker
 Releases
Releases
 RateLimits
RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

License
License
 Plans
Plans
 FinOps
FinOps

Company 3

The organization behind the API

Website
Website
 LinkedIn
LinkedIn
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: mostly-ai
url: https://raw.githubusercontent.com/api-evangelist/mostly-ai/refs/heads/main/apis.yml
name: MOSTLY AI
kind: company
description: MOSTLY AI provides a synthetic data platform for high-fidelity, privacy-safe tabular data. It ships an open-source
  Python SDK (mostlyai, Apache 2.0) that runs in LOCAL mode for on-prem training or CLIENT mode against the hosted MOSTLY
  AI Platform, plus a REST API used by both the SDK and the web app. The SDK is powered by the TabularARGN model architecture
  and supports differential privacy.
deliveryModel:
  model: open-core
  license: Apache-2.0
  open_source: true
  commercial: true
  callable_host: false
  label: Open core · an OSS project plus a commercial hosted product
  confidence: high
  source:
  - license
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: free
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Free · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/mostly-ai.png
tags:
- Synthetic Data
- Privacy
- Tabular
- Differential Privacy
- Python SDK
- REST
- Apache 2.0
created: '2026-05-23'
modified: '2026-05-23'
specificationVersion: '0.23'
apis:
- aid: mostly-ai:rest-api
  name: MOSTLY AI REST API
  description: REST API for the hosted MOSTLY AI Platform. Lets you manage connectors, generators, synthetic datasets, and
    runs. API keys are issued from the user profile menu in the web application.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://api-docs.mostly.ai/
  baseURL: https://app.mostly.ai
  tags:
  - REST
  - Synthetic Data
  - Generators
  - Connectors
  properties:
  - type: Documentation
    url: https://api-docs.mostly.ai/
  - type: ProductDocs
    url: https://mostly.ai/docs
- aid: mostly-ai:python-sdk
  name: MOSTLY AI Synthetic Data SDK
  description: Open-source Python SDK (mostlyai, Apache 2.0) for training generators and producing synthetic data. Runs in
    LOCAL mode on user compute or CLIENT mode against the MOSTLY AI Platform. Powered by the TabularARGN model.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://mostly-ai.github.io/mostlyai/
  baseURL: https://github.com/mostly-ai/mostlyai
  tags:
  - SDK
  - Python
  - Open-Source
  - Apache 2.0
  tags_raw:
  - SDK
  - Python
  - Open Source
  - Apache 2.0
  properties:
  - type: Documentation
    url: https://docs.mostly.ai/python-sdk
  - type: APIReference
    url: https://mostly-ai.github.io/mostlyai/api_client/
  - type: SourceCode
    url: https://github.com/mostly-ai/mostlyai
  - type: PyPI
    url: https://pypi.org/project/mostlyai/
- aid: mostly-ai:mostly-ai-about-api
  name: MOSTLY AI About API
  description: The About API from MOSTLY AI — 1 operation(s) for about.
  humanURL: https://api-docs.mostly.ai/
  baseURL: https://app.mostly.ai
  tags:
  - About
  properties:
  - type: OpenAPI
    url: openapi/mostly-ai-about-api-openapi.yml
- aid: mostly-ai:mostly-ai-computes-api
  name: MOSTLY AI Computes API
  description: The Computes API from MOSTLY AI — 2 operation(s) for computes.
  humanURL: https://api-docs.mostly.ai/
  baseURL: https://app.mostly.ai
  tags:
  - Computes
  properties:
  - type: OpenAPI
    url: openapi/mostly-ai-computes-api-openapi.yml
- aid: mostly-ai:mostly-ai-connectors-api
  name: MOSTLY AI Connectors API
  description: The Connectors API from MOSTLY AI — 7 operation(s) for connectors.
  humanURL: https://api-docs.mostly.ai/
  baseURL: https://app.mostly.ai
  tags:
  - Connectors
  properties:
  - type: OpenAPI
    url: openapi/mostly-ai-connectors-api-openapi.yml
- aid: mostly-ai:mostly-ai-datasets-api
  name: MOSTLY AI Datasets API
  description: The Datasets API from MOSTLY AI — 2 operation(s) for datasets.
  humanURL: https://api-docs.mostly.ai/
  baseURL: https://app.mostly.ai
  tags:
  - Datasets
  properties:
  - type: OpenAPI
    url: openapi/mostly-ai-datasets-api-openapi.yml
- aid: mostly-ai:mostly-ai-generators-api
  name: MOSTLY AI Generators API
  description: The Generators API from MOSTLY AI — 10 operation(s) for generators.
  humanURL: https://api-docs.mostly.ai/
  baseURL: https://app.mostly.ai
  tags:
  - Generators
  properties:
  - type: OpenAPI
    url: openapi/mostly-ai-generators-api-openapi.yml
- aid: mostly-ai:mostly-ai-models-api
  name: MOSTLY AI Models API
  description: The Models API from MOSTLY AI — 1 operation(s) for models.
  humanURL: https://api-docs.mostly.ai/
  baseURL: https://app.mostly.ai
  tags:
  - Models
  properties:
  - type: OpenAPI
    url: openapi/mostly-ai-models-api-openapi.yml
- aid: mostly-ai:mostly-ai-organizations-api
  name: MOSTLY AI Organizations API
  description: The Organizations API from MOSTLY AI — 3 operation(s) for organizations.
  humanURL: https://api-docs.mostly.ai/
  baseURL: https://app.mostly.ai
  tags:
  - Organization
  tags_raw:
  - Organizations
  properties:
  - type: OpenAPI
    url: openapi/mostly-ai-organizations-api-openapi.yml
- aid: mostly-ai:mostly-ai-synthetic-datasets-api
  name: MOSTLY AI Synthetic Datasets API
  description: The Synthetic Datasets API from MOSTLY AI — 5 operation(s) for synthetic datasets.
  humanURL: https://api-docs.mostly.ai/
  baseURL: https://app.mostly.ai
  tags:
  - Synthetic Datasets
  properties:
  - type: OpenAPI
    url: openapi/mostly-ai-synthetic-datasets-api-openapi.yml
- aid: mostly-ai:mostly-ai-synthetic-probes-api
  name: MOSTLY AI Synthetic Probes API
  description: The Synthetic Probes API from MOSTLY AI — 1 operation(s) for synthetic probes.
  humanURL: https://api-docs.mostly.ai/
  baseURL: https://app.mostly.ai
  tags:
  - Synthetic Probes
  properties:
  - type: OpenAPI
    url: openapi/mostly-ai-synthetic-probes-api-openapi.yml
- aid: mostly-ai:mostly-ai-users-api
  name: MOSTLY AI Users API
  description: The Users API from MOSTLY AI — 4 operation(s) for users.
  humanURL: https://api-docs.mostly.ai/
  baseURL: https://app.mostly.ai
  tags:
  - User
  tags_raw:
  - Users
  properties:
  - type: OpenAPI
    url: openapi/mostly-ai-users-api-openapi.yml
common:
- type: IssueTracker
  url: https://github.com/mostly-ai/mostlyai/issues
- type: Releases
  url: https://github.com/mostly-ai/mostlyai/releases
- type: ContributionGuide
  url: https://github.com/mostly-ai/mostlyai/blob/main/CONTRIBUTING.md
- type: License
  name: Apache-2.0
  url: https://github.com/mostly-ai/mostlyai/blob/main/LICENSE
- type: AgenticAccess
  url: agentic-access/mostly-ai-agentic-access.yml
- type: DomainSecurity
  url: security/mostly-ai-domain-security.yml
- type: Authentication
  url: authentication/mostly-ai-authentication.yml
- type: Website
  url: https://mostly.ai/
- type: Documentation
  url: https://mostly.ai/docs
- type: APIDocs
  url: https://api-docs.mostly.ai/
- type: GitHub
  url: https://github.com/mostly-ai
- type: LinkedIn
  url: https://www.linkedin.com/company/mostly-ai
- type: Plans
  url: plans/mostly-ai-plans-pricing.yml
- type: RateLimits
  url: rate-limits/mostly-ai-rate-limits.yml
- type: FinOps
  url: finops/mostly-ai-finops.yml
- url: https://mostly.ai/blog
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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