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, Custom Field 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
56.8/100 strong ▬ flat Agent 37/100 agent ready saas Full breakdown ↓
scored 2026-09-01 · rubric v0.17.2
1 APIs 1 MCP Servers
LegalLegal BillingLaw FirmsTime TrackingBillingInvoicingAccountingTrust AccountingPractice ManagementQuickBooksPaymentsLegal TechSoftware-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 Kin Score How this is scored →
scored 2026-09-01 · rubric v0.17.2
Composite quality — 56.8/100 · strong
Contract Quality 10.4 / 21
Developer Ergonomics 10.0 / 17
Access Clarity 13.0 / 17
Operational Transparency 3.8 / 11
Contract Governance 1.9 / 10
Discoverability 6.5 / 9
Regulatory Posture 8.2 / 15
Agent readiness — 37/100 · 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 Surface 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.
The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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/. 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. Want it done for you? Prioritized profiling — $2,500 →

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 Custom Field API

The CustomField API from LeanLaw — 1 operation(s) for customfield.

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 Time Entry API

The TimeEntry API from LeanLaw — 2 operation(s) for timeentry.

LeanLaw User API

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

Scroll for all 11

MCP Servers 1

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

LeanLaw MCP Server

LeanLaw operates a first-party remote MCP server that lets an AI assistant work with a law firm's clients, matters, time entries, expenses, fixed fees and invoices. Per the prov...

MCP SERVER

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
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
Support
 StatusPage
StatusPage
 ChangeLog
ChangeLog
 RateLimits
RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy
 Plans
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)

apis.yml Raw ↑ 
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
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: MCPServer
    url: mcp/leanlaw-mcp.yml
  - 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-customfield-api
  name: LeanLaw Custom Field API
  description: The CustomField API from LeanLaw — 1 operation(s) for customfield.
  humanURL: https://platform.leanlaw.io/start
  baseURL: https://api.leanlaw.io
  tags:
  - Custom Field
  tags_raw:
  - CustomField
  properties:
  - type: OpenAPI
    url: openapi/leanlaw-customfield-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:
  - 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:
  - 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-timeentry-api
  name: LeanLaw Time Entry API
  description: The TimeEntry API from LeanLaw — 2 operation(s) for timeentry.
  humanURL: https://platform.leanlaw.io/start
  baseURL: https://api.leanlaw.io
  tags:
  - Time entry
  tags_raw:
  - TimeEntry
  properties:
  - type: OpenAPI
    url: openapi/leanlaw-timeentry-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
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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