Milkman

Milkman is an open-source, JavaFx-based, plugin-driven request/response workbench and desktop alternative to Postman and Insomnia. It supports multiple protocols including HTTP/REST, GraphQL, gRPC (with server reflection and streaming), WebSocket, Socket.IO, JDBC/SQL, Cassandra CQL, and Model Context Protocol (MCP).

Milkman publishes 1 API on the APIs.io network. Tagged areas include API Client, Cassandra, Desktop Application, GraphQL, and gRPC.

Milkman’s developer surface includes documentation, release notes, and 5 more developer resources.

📡 Source on GitHub

16.8/100 emerging ▬ flat Agent 3/100 human only Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreemium

1 APIs

API Client Cassandra Desktop Application GraphQL gRPC HTTP Client JDBC MCP Open-Source Socket.IO WebSocket

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 16.8/100 · emerging

Contract Quality 0.0 / 25

Developer Ergonomics 4.3 / 20

Access Clarity 3.2 / 20

Operational Transparency 3.4 / 13

Contract Governance 0.0 / 12

Discoverability 5.9 / 10

Agent readiness — 3/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 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

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/milkman: 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 1

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

Milkman

Milkman is an extensible request/response workbench for various protocols like HTTP, gRPC, GraphQL, WebSocket, Socket.IO, JDBC/SQL, Cassandra, and MCP. The plugin-based desktop ...

GraphQL 1

GraphQL schemas published by this provider.

Milkman GraphQL API

GRAPHQL

Pricing Plans 1

Published pricing tiers and plan structures.

Milkman Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Milkman Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Milkman Finops

FINOPS

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Operate 2

Status, limits, changes, and where to get help

ReleaseNotes

ReleaseNotes

Issues

Issues

Commercial 1

Pricing, plans, and the legal terms of use

License

License

Company 2

The organization behind the API

LinkedIn

Website

Website

Source (apis.yml)

aid: milkman
name: Milkman
description: Milkman is an open-source, JavaFx-based, plugin-driven request/response workbench and desktop alternative to
  Postman and Insomnia. It supports multiple protocols including HTTP/REST, GraphQL, gRPC (with server reflection and streaming),
  WebSocket, Socket.IO, JDBC/SQL, Cassandra CQL, and Model Context Protocol (MCP).
type: Index
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/milkman.png
tags:
- API Client
- Cassandra
- Desktop Application
- GraphQL
- gRPC
- HTTP Client
- JDBC
- MCP
- Open-Source
- Socket.IO
- WebSocket
tags_raw:
- API Client
- Cassandra
- Desktop Application
- GraphQL
- gRPC
- HTTP Client
- JDBC
- MCP
- Open Source
- Socket.IO
- WebSocket
url: https://raw.githubusercontent.com/api-evangelist/milkman/refs/heads/main/apis.yml
created: '2026-03-27'
modified: '2026-04-28'
specificationVersion: '0.23'
apis:
- aid: milkman:milkman
  name: Milkman
  description: Milkman is an extensible request/response workbench for various protocols like HTTP, gRPC, GraphQL, WebSocket,
    Socket.IO, JDBC/SQL, Cassandra, and MCP. The plugin-based desktop application supports workspaces, environments, collections,
    OAuth, Postman/Insomnia import, Git-based team sync, a CLI for terminal usage, and a test runner for sequential request
    execution.
  humanURL: https://github.com/warmuuh/milkman
  tags:
  - API Client
  - Desktop Application
  - HTTP Client
  - Plugin Architecture
  properties:
  - type: Documentation
    url: https://github.com/warmuuh/milkman#readme
  - type: GettingStarted
    url: https://github.com/warmuuh/milkman#getting-started
  - type: Source Code
    url: https://github.com/warmuuh/milkman
  - type: ReleaseNotes
    url: https://github.com/warmuuh/milkman/releases
  - type: Issues
    url: https://github.com/warmuuh/milkman/issues
  - type: Plugins
    url: https://github.com/warmuuh/milkman/wiki
  - url: graphql/milkman-graphql.md
    type: GraphQL
common:
- type: LinkedIn
  url: https://www.linkedin.com/company/milkmantechnologies
- type: Website
  url: https://github.com/warmuuh/milkman
- type: Documentation
  url: https://github.com/warmuuh/milkman#readme
- type: GitHubOrganization
  url: https://github.com/warmuuh/milkman
- type: ReleaseNotes
  url: https://github.com/warmuuh/milkman/releases
- type: Issues
  url: https://github.com/warmuuh/milkman/issues
- type: License
  url: https://github.com/warmuuh/milkman/blob/master/LICENSE
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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