LeanLaw

LeanLaw is legal billing and revenue-operations software for small and mid-sized law firms, built natively on QuickBooks Online. It runs the full law-firm revenue lifecycle — time and expense tracking, matter management, trust/IOLTA accounting, flat-fee and contingency billing, invoicing, e-payments, LEDES output and compensation reporting — and keeps a real-time two-way sync with QuickBooks Online so invoices, payments, trust deposits and expenses post automatically. LeanLaw publishes a public REST API (v2) at api.leanlaw.io covering clients, matters, time entries, expenses, fixed fees, invoices, practice areas, custom fields, users and LEDES billing codes, with an OpenAPI 3.0.4 specification, a Zudoku-powered developer portal at platform.leanlaw.io, and a remote MCP server for AI assistants that is currently in private beta.

LeanLaw publishes 10 APIs on the APIs.io network, including Client API, Codes API, Expense API, and 7 more. Tagged areas include Legal, Legal Billing, Law Firms, Time Tracking, and Billing.

LeanLaw’s developer surface includes documentation, API reference, getting-started guide, support, engineering blog, pricing, signup flow, and 21 more developer resources.

🌐 Visit website 📡 Source on GitHub

57.0/100 strong ▬ flat Agent 42/100 agent ready Front door AI 3/6 light saas Full breakdown ↓
scored 2026-09-20 · rubric v0.22.0

AccessPaidSelf serve

1 APIs

LegalLegal BillingLaw Firms Time Tracking Billing Invoicing Accounting Trust Accounting Practice Management QuickBooks Payments Legal Tech Software-as-a-Service

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Legal Management

BC-150

Matter

POST /v2/matters

Kin Score

Kin Score How this is scored →
scored 2026-09-20 · rubric v0.22.0

Composite quality — 57.0/100 · strong

Contract Quality 9.8 / 19

Developer Ergonomics 8.8 / 15

Access Clarity 11.4 / 15

Operational Transparency 3.3 / 10

Contract Governance 1.6 / 9

Discoverability 5.7 / 8

Regulatory Posture 8.2 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 42/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

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 7 / 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 5 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Payments 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/leanlaw: 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 11

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

LeanLaw MCP Server

LeanLaw operates a remote Model Context Protocol server at https://api.leanlaw.io/mcp that lets an AI assistant work with a firm's clients, matters, time entries, expenses, fixe...

LeanLaw Client API

The Client API from LeanLaw — 3 operation(s) for client.

LeanLaw Codes API

The Codes API from LeanLaw — 1 operation(s) for codes.

LeanLaw Expense API

The Expense API from LeanLaw — 2 operation(s) for expense.

LeanLaw Fixed Fee API

The FixedFee API from LeanLaw — 2 operation(s) for fixedfee.

LeanLaw Invoice API

The Invoice API from LeanLaw — 1 operation(s) for invoice.

LeanLaw Matter API

The Matter API from LeanLaw — 2 operation(s) for matter.

LeanLaw Practice Area API

The PracticeArea API from LeanLaw — 2 operation(s) for practicearea.

LeanLaw User API

The User API from LeanLaw — 2 operation(s) for user.

LeanLaw Custom Field API

The Custom Field API from LeanLaw — 1 operation(s) for custom field.

LeanLaw Time entry API

The Time entry API from LeanLaw — 2 operation(s) for time entry.

Scroll for all 11

Pricing Plans 1

Published pricing tiers and plan structures.

Leanlaw Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Leanlaw Rate Limits

0 limits

RATE LIMITS

Security Posture 2

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

Leanlaw Authentication

http/oauth2 · 2 schemes

SECURITY

Leanlaw Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Leanlaw Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

LLMsTxt

LLMsTxt

AgentSkill

AgentSkill

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Lifecycle

Lifecycle

Conformance

Conformance

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

Access & Security 3

Authentication, authorization, and security posture

Authentication

Authentication

OAuthScopes

OAuthScopes

DomainSecurity

DomainSecurity

Operate 4

Status, limits, changes, and where to get help

Support

StatusPage

ChangeLog

RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

Pricing

TermsOfService

PrivacyPolicy

Plans

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Overlay

Overlay

Source (apis.yml)

aid: leanlaw
name: LeanLaw
description: LeanLaw is legal billing and revenue-operations software for small and mid-sized law firms, built natively on
  QuickBooks Online. It runs the full law-firm revenue lifecycle — time and expense tracking, matter management, trust/IOLTA
  accounting, flat-fee and contingency billing, invoicing, e-payments, LEDES output and compensation reporting — and keeps
  a real-time two-way sync with QuickBooks Online so invoices, payments, trust deposits and expenses post automatically. LeanLaw
  publishes a public REST API (v2) at api.leanlaw.io covering clients, matters, time entries, expenses, fixed fees, invoices,
  practice areas, custom fields, users and LEDES billing codes, with an OpenAPI 3.0.4 specification, a Zudoku-powered developer
  portal at platform.leanlaw.io, and a remote MCP server for AI assistants that is currently in private beta.
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: paid
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Paid · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  - scopes
  - rate-limits
  - security
  generated: '2026-09-02'
  method: derived
image: https://www.leanlaw.co/images/og-default.png
url: https://raw.githubusercontent.com/api-evangelist/leanlaw/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
specificationVersion: '0.20'
created: '2026-08-25'
modified: '2026-08-25'
tags:
- Legal
- Legal Billing
- Law Firms
- Time Tracking
- Billing
- Invoicing
- Accounting
- Trust Accounting
- Practice Management
- QuickBooks
- Payments
- Legal Tech
- Software-as-a-Service
tags_raw:
- Legal
- Legal Billing
- Law Firms
- Time Tracking
- Billing
- Invoicing
- Accounting
- Trust Accounting
- Practice Management
- QuickBooks
- Payments
- LegalTech
- SaaS
apis:
- aid: leanlaw:leanlaw-mcp
  name: LeanLaw MCP Server
  description: LeanLaw operates a remote Model Context Protocol server at https://api.leanlaw.io/mcp that lets an AI assistant
    work with a firm's clients, matters, time entries, expenses, fixed fees and invoices. It exposes the same operations as
    the REST API plus higher-level composite actions, is authorized per user via OAuth 2.1 against https://auth.myleanlaw.co/
    with granular read/write scopes, and is in private beta enabled per firm on request.
  humanURL: https://platform.leanlaw.io/agents
  baseURL: https://api.leanlaw.io/mcp
  tags:
  - MCP
  - AI Agents
  - Legal Billing
  properties:
  - type: X-MCPServerCandidate
    url: mcp/leanlaw-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: ToolCrosswalk
    url: mcp/leanlaw-tool-crosswalk.yml
  - type: OAuthScopes
    url: scopes/leanlaw-scopes.yml
  - type: Documentation
    url: https://platform.leanlaw.io/agents
- aid: leanlaw:leanlaw-client-api
  name: LeanLaw Client API
  description: The Client API from LeanLaw — 3 operation(s) for client.
  humanURL: https://platform.leanlaw.io/start
  baseURL: https://api.leanlaw.io
  tags:
  - Clients
  tags_raw:
  - Client
  properties:
  - type: OpenAPI
    url: openapi/leanlaw-client-api-openapi.yml
  - type: Documentation
    url: https://platform.leanlaw.io/start
  - type: APIReference
    url: https://platform.leanlaw.io/api
  - type: GettingStarted
    url: https://platform.leanlaw.io/start
  - type: Authentication
    url: authentication/leanlaw-authentication.yml
  - type: ErrorCatalog
    url: errors/leanlaw-problem-types.yml
  - type: DataModel
    url: data-model/leanlaw-data-model.yml
  - type: Conventions
    url: conventions/leanlaw-conventions.yml
  - type: RateLimits
    url: rate-limits/leanlaw-rate-limits.yml
- aid: leanlaw:leanlaw-codes-api
  name: LeanLaw Codes API
  description: The Codes API from LeanLaw — 1 operation(s) for codes.
  humanURL: https://platform.leanlaw.io/start
  baseURL: https://api.leanlaw.io
  tags:
  - Codes
  properties:
  - type: OpenAPI
    url: openapi/leanlaw-codes-api-openapi.yml
  - type: Documentation
    url: https://platform.leanlaw.io/start
  - type: APIReference
    url: https://platform.leanlaw.io/api
  - type: GettingStarted
    url: https://platform.leanlaw.io/start
  - type: Authentication
    url: authentication/leanlaw-authentication.yml
  - type: ErrorCatalog
    url: errors/leanlaw-problem-types.yml
  - type: DataModel
    url: data-model/leanlaw-data-model.yml
  - type: Conventions
    url: conventions/leanlaw-conventions.yml
  - type: RateLimits
    url: rate-limits/leanlaw-rate-limits.yml
- aid: leanlaw:leanlaw-expense-api
  name: LeanLaw Expense API
  description: The Expense API from LeanLaw — 2 operation(s) for expense.
  humanURL: https://platform.leanlaw.io/start
  baseURL: https://api.leanlaw.io
  tags:
  - Expenses
  tags_raw:
  - Expense
  properties:
  - type: OpenAPI
    url: openapi/leanlaw-expense-api-openapi.yml
  - type: Documentation
    url: https://platform.leanlaw.io/start
  - type: APIReference
    url: https://platform.leanlaw.io/api
  - type: GettingStarted
    url: https://platform.leanlaw.io/start
  - type: Authentication
    url: authentication/leanlaw-authentication.yml
  - type: ErrorCatalog
    url: errors/leanlaw-problem-types.yml
  - type: DataModel
    url: data-model/leanlaw-data-model.yml
  - type: Conventions
    url: conventions/leanlaw-conventions.yml
  - type: RateLimits
    url: rate-limits/leanlaw-rate-limits.yml
- aid: leanlaw:leanlaw-fixedfee-api
  name: LeanLaw Fixed Fee API
  description: The FixedFee API from LeanLaw — 2 operation(s) for fixedfee.
  humanURL: https://platform.leanlaw.io/start
  baseURL: https://api.leanlaw.io
  tags:
  - FixedFee
  properties:
  - type: OpenAPI
    url: openapi/leanlaw-fixedfee-api-openapi.yml
  - type: Documentation
    url: https://platform.leanlaw.io/start
  - type: APIReference
    url: https://platform.leanlaw.io/api
  - type: GettingStarted
    url: https://platform.leanlaw.io/start
  - type: Authentication
    url: authentication/leanlaw-authentication.yml
  - type: ErrorCatalog
    url: errors/leanlaw-problem-types.yml
  - type: DataModel
    url: data-model/leanlaw-data-model.yml
  - type: Conventions
    url: conventions/leanlaw-conventions.yml
  - type: RateLimits
    url: rate-limits/leanlaw-rate-limits.yml
- aid: leanlaw:leanlaw-invoice-api
  name: LeanLaw Invoice API
  description: The Invoice API from LeanLaw — 1 operation(s) for invoice.
  humanURL: https://platform.leanlaw.io/start
  baseURL: https://api.leanlaw.io
  tags:
  - Invoices
  tags_raw:
  - Invoice
  properties:
  - type: OpenAPI
    url: openapi/leanlaw-invoice-api-openapi.yml
  - type: Documentation
    url: https://platform.leanlaw.io/start
  - type: APIReference
    url: https://platform.leanlaw.io/api
  - type: GettingStarted
    url: https://platform.leanlaw.io/start
  - type: Authentication
    url: authentication/leanlaw-authentication.yml
  - type: ErrorCatalog
    url: errors/leanlaw-problem-types.yml
  - type: DataModel
    url: data-model/leanlaw-data-model.yml
  - type: Conventions
    url: conventions/leanlaw-conventions.yml
  - type: RateLimits
    url: rate-limits/leanlaw-rate-limits.yml
- aid: leanlaw:leanlaw-matter-api
  name: LeanLaw Matter API
  description: The Matter API from LeanLaw — 2 operation(s) for matter.
  humanURL: https://platform.leanlaw.io/start
  baseURL: https://api.leanlaw.io
  tags:
  - Matter
  properties:
  - type: OpenAPI
    url: openapi/leanlaw-matter-api-openapi.yml
  - type: Documentation
    url: https://platform.leanlaw.io/start
  - type: APIReference
    url: https://platform.leanlaw.io/api
  - type: GettingStarted
    url: https://platform.leanlaw.io/start
  - type: Authentication
    url: authentication/leanlaw-authentication.yml
  - type: ErrorCatalog
    url: errors/leanlaw-problem-types.yml
  - type: DataModel
    url: data-model/leanlaw-data-model.yml
  - type: Conventions
    url: conventions/leanlaw-conventions.yml
  - type: RateLimits
    url: rate-limits/leanlaw-rate-limits.yml
- aid: leanlaw:leanlaw-practicearea-api
  name: LeanLaw Practice Area API
  description: The PracticeArea API from LeanLaw — 2 operation(s) for practicearea.
  humanURL: https://platform.leanlaw.io/start
  baseURL: https://api.leanlaw.io
  tags:
  - PracticeArea
  properties:
  - type: OpenAPI
    url: openapi/leanlaw-practicearea-api-openapi.yml
  - type: Documentation
    url: https://platform.leanlaw.io/start
  - type: APIReference
    url: https://platform.leanlaw.io/api
  - type: GettingStarted
    url: https://platform.leanlaw.io/start
  - type: Authentication
    url: authentication/leanlaw-authentication.yml
  - type: ErrorCatalog
    url: errors/leanlaw-problem-types.yml
  - type: DataModel
    url: data-model/leanlaw-data-model.yml
  - type: Conventions
    url: conventions/leanlaw-conventions.yml
  - type: RateLimits
    url: rate-limits/leanlaw-rate-limits.yml
- aid: leanlaw:leanlaw-user-api
  name: LeanLaw User API
  description: The User API from LeanLaw — 2 operation(s) for user.
  humanURL: https://platform.leanlaw.io/start
  baseURL: https://api.leanlaw.io
  tags:
  - User
  properties:
  - type: OpenAPI
    url: openapi/leanlaw-user-api-openapi.yml
  - type: Documentation
    url: https://platform.leanlaw.io/start
  - type: APIReference
    url: https://platform.leanlaw.io/api
  - type: GettingStarted
    url: https://platform.leanlaw.io/start
  - type: Authentication
    url: authentication/leanlaw-authentication.yml
  - type: ErrorCatalog
    url: errors/leanlaw-problem-types.yml
  - type: DataModel
    url: data-model/leanlaw-data-model.yml
  - type: Conventions
    url: conventions/leanlaw-conventions.yml
  - type: RateLimits
    url: rate-limits/leanlaw-rate-limits.yml
- aid: leanlaw:leanlaw-custom-field-api
  name: LeanLaw Custom Field API
  description: The Custom Field API from LeanLaw — 1 operation(s) for custom field.
  humanURL: https://platform.leanlaw.io/agents
  baseURL: https://api.leanlaw.io/mcp
  tags:
  - Custom Field
  properties:
  - type: OpenAPI
    url: openapi/leanlaw-custom-field-api-openapi.yml
  - type: Documentation
    url: https://platform.leanlaw.io/start
  - type: APIReference
    url: https://platform.leanlaw.io/api
  - type: GettingStarted
    url: https://platform.leanlaw.io/start
  - type: Authentication
    url: authentication/leanlaw-authentication.yml
  - type: ErrorCatalog
    url: errors/leanlaw-problem-types.yml
  - type: DataModel
    url: data-model/leanlaw-data-model.yml
  - type: Conventions
    url: conventions/leanlaw-conventions.yml
  - type: RateLimits
    url: rate-limits/leanlaw-rate-limits.yml
- aid: leanlaw:leanlaw-time-entry-api
  name: LeanLaw Time entry API
  description: The Time entry API from LeanLaw — 2 operation(s) for time entry.
  humanURL: https://platform.leanlaw.io/agents
  baseURL: https://api.leanlaw.io/mcp
  tags:
  - Time entry
  properties:
  - type: OpenAPI
    url: openapi/leanlaw-time-entry-api-openapi.yml
  - type: Documentation
    url: https://platform.leanlaw.io/start
  - type: APIReference
    url: https://platform.leanlaw.io/api
  - type: GettingStarted
    url: https://platform.leanlaw.io/start
  - type: Authentication
    url: authentication/leanlaw-authentication.yml
  - type: ErrorCatalog
    url: errors/leanlaw-problem-types.yml
  - type: DataModel
    url: data-model/leanlaw-data-model.yml
  - type: Conventions
    url: conventions/leanlaw-conventions.yml
  - type: RateLimits
    url: rate-limits/leanlaw-rate-limits.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: CapabilityMap
  url: capabilities/leanlaw-capability-edges.yml
  name: LeanLaw Business Capability Map
- type: Overlay
  url: overlays/leanlaw-api-overlay.yaml
- type: Website
  url: https://www.leanlaw.co/
- type: DeveloperPortal
  url: https://platform.leanlaw.io/start
- type: Documentation
  url: https://platform.leanlaw.io/start
- type: APIReference
  url: https://platform.leanlaw.io/api
- type: GettingStarted
  url: https://platform.leanlaw.io/start
- type: Support
  url: https://support.leanlaw.co/
- type: Blog
  url: https://www.leanlaw.co/blog/
- type: GitHubOrganization
  url: https://github.com/leanlaw
- type: Pricing
  url: https://www.leanlaw.co/pricing/
- type: SignUp
  url: https://www.leanlaw.co/leanlaw-trial/
- type: Login
  url: https://next.myleanlaw.co/
- type: TermsOfService
  url: https://www.leanlaw.co/terms/
- type: PrivacyPolicy
  url: https://www.leanlaw.co/privacy/
- type: StatusPage
  url: https://leanlaw.statuspage.io/
- type: ChangeLog
  url: https://platform.leanlaw.io/changelog
- type: Lifecycle
  url: lifecycle/leanlaw-lifecycle.yml
- type: Plans
  url: plans/leanlaw-plans-pricing.yml
- type: RateLimits
  url: rate-limits/leanlaw-rate-limits.yml
- type: Authentication
  url: authentication/leanlaw-authentication.yml
- type: OAuthScopes
  url: scopes/leanlaw-scopes.yml
- type: WellKnown
  url: well-known/leanlaw-well-known.yml
- type: Conformance
  url: conformance/leanlaw-conformance.yml
- type: DomainSecurity
  url: security/leanlaw-domain-security.yml
- type: Packages
  url: packages/leanlaw-packages.yml
- type: LLMsTxt
  url: llms/leanlaw-llms.txt
- type: AgentSkill
  url: skills/_index.yml
x-enrichment:
  date: '2026-08-25'
  status: enriched
  artifacts_added: 24
  pass: local-v1

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