Sarus website screenshot

Sarus

Sarus Technologies is a Paris-based privacy-engineering company (Y Combinator W22, founded 2020 by the team behind AlephD) that builds a privacy layer sitting between sensitive data and the analysts, data scientists and LLMs that need it. The Sarus platform deploys inside the customer's own infrastructure — Docker or Kubernetes, on-premises or on AWS, Azure and GCP — and applies differential privacy, DP-trained synthetic data and on-the-fly SQL and Python query rewriting so practitioners can run analytics, machine learning and LLM fine-tuning on data they never see. Developers reach the platform through the first-party 'sarus' Python client for the Sarus Gateway, a BI connector, and Qrlew, Sarus's open-source Rust SQL-rewriting engine. Because the product is customer-deployed, Sarus publishes no hosted, multi-tenant API base URL and no OpenAPI; its public machine-readable surface is the Sarus Data Spec protobuf schema and the Qrlew server's published request examples.

Sarus publishes 2 APIs on the APIs.io network. Tagged areas include Company, Ai Data, Privacy, Differential Privacy, and Synthetic Data.

Sarus’ developer surface includes documentation, engineering blog, support, code examples, authentication, changelog, and 13 more developer resources.

🌐 Visit website 📡 Source on GitHub
26.8/100 thin ▬ flat Agent 19/100 agent aware Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0
2 APIs
CompanyAi DataPrivacyDifferential PrivacySynthetic DataAnalyticsMachine-LearningData GovernanceSQLOpen-Source

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0
Composite quality — 26.8/100 · thin
Contract Quality 8.3 / 25
Developer Ergonomics 7.1 / 20
Access Clarity 2.1 / 20
Operational Transparency 2.4 / 13
Contract Governance 0.0 / 12
Discoverability 6.9 / 10
Agent readiness — 19/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 10
Documented Reversibility 0 / 6
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 7 / 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/sarus: 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 2

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

Sarus Gateway API

The Sarus Gateway is the server component of the Sarus privacy layer. It is deployed inside the customer's own environment (Docker or Kubernetes, on-premises or in AWS/Azure/GCP...

Qrlew Server API

Qrlew is Sarus's open-source (Apache 2.0) SQL manipulation and differential-privacy engine, written in Rust and published under github.com/Qrlew. The Qrlew server wraps it in a ...

Resources

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Conformance
Conformance
 Lifecycle
Lifecycle
 Conventions
Conventions

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 Packages
Packages
 SDKs
SDKs
 Examples
Examples

Access & Security 1

Authentication, authorization, and security posture

Authentication
Authentication

Operate 3

Status, limits, changes, and where to get help

Support
Support
 ChangeLog
ChangeLog
 RateLimits
RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

License
License
 PrivacyPolicy
PrivacyPolicy
 Plans
Plans

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Other 1

Properties that don't map to a standard resource type

Protobuf
Protobuf

Source (apis.yml)

apis.yml Raw ↑ 
aid: sarus
name: Sarus
description: Sarus Technologies is a Paris-based privacy-engineering company (Y Combinator W22, founded 2020 by the team behind
  AlephD) that builds a privacy layer sitting between sensitive data and the analysts, data scientists and LLMs that need
  it. The Sarus platform deploys inside the customer's own infrastructure — Docker or Kubernetes, on-premises or on AWS, Azure
  and GCP — and applies differential privacy, DP-trained synthetic data and on-the-fly SQL and Python query rewriting so practitioners
  can run analytics, machine learning and LLM fine-tuning on data they never see. Developers reach the platform through the
  first-party 'sarus' Python client for the Sarus Gateway, a BI connector, and Qrlew, Sarus's open-source Rust SQL-rewriting
  engine. Because the product is customer-deployed, Sarus publishes no hosted, multi-tenant API base URL and no OpenAPI; its
  public machine-readable surface is the Sarus Data Spec protobuf schema and the Qrlew server's published request examples.
url: https://raw.githubusercontent.com/api-evangelist/sarus/refs/heads/main/apis.yml
x-type: company
x-source: serena-portfolio
deliveryModel:
  model: unknown
  open_source: unknown
  commercial: true
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - pricing
  - repository-unlicensed
  generated: '2026-08-28'
  method: derived
specificationVersion: '0.23'
created: '2026-08-17'
modified: '2026-08-17'
image: https://cdn.prod.website-files.com/61bc58893bfe8290fd9fa12a/61bc58893bfe827a089fa131_logotype-dark.svg
tags:
- Company
- Ai Data
- Privacy
- Differential Privacy
- Synthetic Data
- Analytics
- Machine-Learning
- Data Governance
- SQL
- Open-Source
tags_raw:
- Company
- Ai Data
- Privacy
- Differential Privacy
- Synthetic Data
- Analytics
- Machine Learning
- Data Governance
- SQL
- Open Source
apis:
- aid: sarus:sarus-gateway
  name: Sarus Gateway API
  description: The Sarus Gateway is the server component of the Sarus privacy layer. It is deployed inside the customer's
    own environment (Docker or Kubernetes, on-premises or in AWS/Azure/GCP) and is reached by the first-party 'sarus' Python
    client, a BI connector, and SQL. Because every deployment is customer-hosted there is no shared production base URL; the
    host is a deployment variable. The reference at docs.sarus.tech is no longer publicly readable (GitLab Pages access control
    returns 401), so no OpenAPI or public endpoint reference could be captured.
  humanURL: https://docs.sarus.tech/
  baseURL: https://{sarus-gateway-host}/
  tags:
  - Privacy
  - Differential Privacy
  - Analytics
  - Machine-Learning
  tags_raw:
  - Privacy
  - Differential Privacy
  - Analytics
  - Machine Learning
  properties:
  - type: Documentation
    url: https://docs.sarus.tech/
  - type: SDKs
    url: packages/sarus-packages.yml
  - type: Protobuf
    url: grpc/sarus-schema.proto
- aid: sarus:qrlew-server
  name: Qrlew Server API
  description: Qrlew is Sarus's open-source (Apache 2.0) SQL manipulation and differential-privacy engine, written in Rust
    and published under github.com/Qrlew. The Qrlew server wraps it in a small RESTful API — POST /dot, /rewrite_as_privacy_unit_preserving,
    /rewrite_with_differential_privacy, /verify and GET /public_key — distributed as the container image ghcr.io/qrlew/server:main
    and run by the operator. The demo host the README names (qrlew.sarus.app) no longer resolves to a live service, so this
    is a self-hosted surface only.
  humanURL: https://github.com/Qrlew/server
  baseURL: https://{qrlew-server-host}/
  tags:
  - SQL
  - Differential Privacy
  - Open-Source
  tags_raw:
  - SQL
  - Differential Privacy
  - Open Source
  properties:
  - type: SourceCode
    url: https://github.com/Qrlew/server
  - type: Documentation
    url: https://qrlew.github.io/
  - type: Examples
    url: examples/qrlew-server-example.http
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: License
  name: Apache-2.0
  url: https://github.com/Qrlew/server/blob/main/LICENSE
- type: Website
  url: https://www.sarus.tech/
- type: Documentation
  url: https://docs.sarus.tech/
- type: GitHubOrganization
  url: https://github.com/sarus-tech
- type: Blog
  url: https://www.sarus.tech/blog
- type: Support
  url: https://www.sarus.tech/contact
- type: PrivacyPolicy
  url: https://www.sarus.tech/privacy-policy
- type: Packages
  url: packages/sarus-packages.yml
- type: SDKs
  url: packages/sarus-packages.yml
- type: Protobuf
  url: grpc/sarus-schema.proto
- type: Examples
  url: examples/qrlew-server-example.http
- type: LLMsTxt
  url: llms/sarus-llms.txt
- type: Conformance
  url: conformance/sarus-conformance.yml
- type: Lifecycle
  url: lifecycle/sarus-lifecycle.yml
- type: Authentication
  url: authentication/sarus-authentication.yml
- type: Conventions
  url: conventions/sarus-conventions.yml
- type: ChangeLog
  url: changelog/sarus-changelog.yml
- type: Plans
  url: plans/sarus-plans-pricing.yml
- type: RateLimits
  url: rate-limits/sarus-rate-limits.yml

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this
  • find_providersBrowse and filter every provider in the catalog.
  • get_provider_artifactsEvery artifact this provider publishes, grouped by type.
  • get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
  • get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
  • get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
  • get_provider_ratingPRO — composite, band, trend and facet scores.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This provider 
curl "https://apis.io/api/v1/providers/sarus"
All providers 
curl "https://apis.io/api/v1/providers?limit=25"
Every operation they expose 
curl "https://apis.io/api/v1/providers/sarus/operations?limit=25"
How their score was established 
curl "https://apis.io/api/v1/providers/sarus/evidence"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.