SimpleLegal

SimpleLegal is Onit's mid-market enterprise legal management (ELM) platform trusted by 550+ corporate legal departments. It provides matter management, eBilling, spend management, vendor management, legal requests, and legal operations analytics for in-house legal teams. The SimpleLegal API is organized around REST with predictable, resource-oriented URLs, enabling integration with ERP and finance systems to eliminate duplicate data entry and automate legal operations workflows.

SimpleLegal publishes 6 APIs on the APIs.io network, including Cost Codes API, Invoices API, Matters API, and 3 more. Tagged areas include E-Billing, Enterprise Legal Management, Legal Operations, Legal Spend Management, and Matter Management.

The SimpleLegal catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.

SimpleLegal’s developer surface includes authentication, documentation, engineering blog, GitHub presence, support, and 13 more developer resources.

🌐 Visit website 📡 Source on GitHub

38.5/100 thin ▬ flat Agent 26/100 agent aware Front door AI 4/6 moderate saas Full breakdown ↓
scored 2026-10-04 · rubric v0.23.0

AccessFreemiumSelf serve⚡ Free to try

1 published contract

E-Billing Enterprise Legal Management Legal Operations Legal Spend Management Matter Management Vendor Management

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

Matters

Kin Score

Kin Score How this is scored →
scored 2026-10-04 · rubric v0.23.0

Composite quality — 38.5/100 · thin

Contract Quality 10.1 / 19

Developer Ergonomics 3.9 / 15

Access Clarity 4.9 / 15

Operational Transparency 2.3 / 10

Contract Governance 2.5 / 9

Discoverability 5.0 / 8

Regulatory Posture 3.4 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 26/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 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 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

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) 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/simplelegal: 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 6

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

SimpleLegal Cost Codes API

The Cost Codes API from SimpleLegal — 1 operation(s) for cost codes.

SimpleLegal Invoices API

The Invoices API from SimpleLegal — 2 operation(s) for invoices.

SimpleLegal Matters API

The Matters API from SimpleLegal — 2 operation(s) for matters.

SimpleLegal Payments API

The Payments API from SimpleLegal — 1 operation(s) for payments.

SimpleLegal Users API

The Users API from SimpleLegal — 1 operation(s) for users.

SimpleLegal Vendors API

The Vendors API from SimpleLegal — 2 operation(s) for vendors.

Open Collections 8

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

API Collection

OPEN COLLECTION

SimpleLegal Cost Codes API

OPEN COLLECTION

SimpleLegal Cost Codes Invoices API

OPEN COLLECTION

SimpleLegal Cost Codes Matters API

OPEN COLLECTION

SimpleLegal Cost Codes Payments API

OPEN COLLECTION

SimpleLegal Cost Codes Users API

OPEN COLLECTION

SimpleLegal Cost Codes Vendors API

OPEN COLLECTION

SimpleLegal API

OPEN COLLECTION

Scroll for all 8

Pricing Plans 1

Published pricing tiers and plan structures.

Simplelegal Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Simplelegal Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Simplelegal Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Simplelegal Context

39 classes · 4 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

SimpleLegal API Rules

5 rules · 4 warnings 1 info

SPECTRAL

SimpleLegal API Rules

8 rules · 5 warnings 3 info

SPECTRAL

JSON Schema 3

Standalone JSON Schema definitions for this provider's data models.

SimpleLegal Invoice

13 properties

JSON SCHEMA

SimpleLegal Matter

15 properties

JSON SCHEMA

SimpleLegal Vendor

10 properties

JSON SCHEMA

JSON Structure 2

JSON Structure definitions describing this provider's data shapes.

Simplelegal Invoice Structure

0 properties

JSON STRUCTURE

Simplelegal Matter Structure

0 properties

JSON STRUCTURE

Examples 3

Example request and response payloads for these APIs.

Simplelegal Create Matter Example

3 fields

EXAMPLE

Simplelegal Create Vendor Example

3 fields

EXAMPLE

Simplelegal List Invoices Example

3 fields

EXAMPLE

Security Posture 3

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

Simplelegal Authentication

http · 1 scheme

SECURITY

Simplelegal Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Simplelegal Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access 1

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

Simplelegal Agentic Access

17 operations · 8 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

CounselGO Vendor Portal

CounselGO Vendor Portal

Login

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

WellKnown

WellKnown

Build 1

SDKs, sample code, and the tooling you integrate with

GitHub

GitHub

Access & Security 5

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

Authentication

SecurityTxt

Security

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 1

Pricing, plans, and the legal terms of use

Legal Requests

Legal Requests

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Parent Company

Parent Company

Source (apis.yml)

aid: simplelegal
name: SimpleLegal
description: SimpleLegal is Onit's mid-market enterprise legal management (ELM) platform trusted by 550+ corporate legal departments.
  It provides matter management, eBilling, spend management, vendor management, legal requests, and legal operations analytics
  for in-house legal teams. The SimpleLegal API is organized around REST with predictable, resource-oriented URLs, enabling
  integration with ERP and finance systems to eliminate duplicate data entry and automate legal operations workflows.
type: Index
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: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  - url: https://www.simplelegal.com/
    status: 301
    note: declared website redirects to https://www.onit.com/products/elm/simplelegal/ — a different registrable domain (simplelegal.com
      -> onit.com), possible rename or acquisition (probed 2026-09-03, roadmap#169)
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/simplelegal.png
x-docs-platform: postman
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-04
tags:
- E-Billing
- Enterprise Legal Management
- Legal Operations
- Legal Spend Management
- Matter Management
- Vendor Management
tags_raw:
- eBilling
- Enterprise Legal Management
- Legal Operations
- Legal Spend Management
- Matter Management
- Vendor Management
position: Consuming
access: 3rd-Party
url: https://raw.githubusercontent.com/api-evangelist/simplelegal/refs/heads/main/apis.yml
created: '2025-03-01'
modified: '2026-08-08'
specificationVersion: '0.23'
apis:
- aid: simplelegal:simplelegal-cost-codes-api
  name: SimpleLegal Cost Codes API
  description: The Cost Codes API from SimpleLegal — 1 operation(s) for cost codes.
  humanURL: https://developer.simplelegal.com/
  baseURL: https://app.simplelegal.com/api
  tags:
  - Cost Codes
  properties:
  - type: OpenAPI
    url: openapi/simplelegal-cost-codes-api-openapi.yml
  - type: Documentation
    url: https://developer.simplelegal.com/
  - type: Website
    url: https://www.simplelegal.com/
  - type: Pricing
    url: https://www.simplelegal.com/pricing
  - type: Integrations
    url: https://www.simplelegal.com/integrations
  - type: Rules
    url: https://raw.githubusercontent.com/api-evangelist/simplelegal/refs/heads/main/rules/simplelegal-rules.yml
  - type: Vocabulary
    url: https://raw.githubusercontent.com/api-evangelist/simplelegal/refs/heads/main/vocabulary/simplelegal-vocabulary.yml
- aid: simplelegal:simplelegal-invoices-api
  name: SimpleLegal Invoices API
  description: The Invoices API from SimpleLegal — 2 operation(s) for invoices.
  humanURL: https://developer.simplelegal.com/
  baseURL: https://app.simplelegal.com/api
  tags:
  - Invoices
  properties:
  - type: OpenAPI
    url: openapi/simplelegal-invoices-api-openapi.yml
  - type: Documentation
    url: https://developer.simplelegal.com/
  - type: Website
    url: https://www.simplelegal.com/
  - type: Pricing
    url: https://www.simplelegal.com/pricing
  - type: Integrations
    url: https://www.simplelegal.com/integrations
  - type: Rules
    url: https://raw.githubusercontent.com/api-evangelist/simplelegal/refs/heads/main/rules/simplelegal-rules.yml
  - type: Vocabulary
    url: https://raw.githubusercontent.com/api-evangelist/simplelegal/refs/heads/main/vocabulary/simplelegal-vocabulary.yml
- aid: simplelegal:simplelegal-matters-api
  name: SimpleLegal Matters API
  description: The Matters API from SimpleLegal — 2 operation(s) for matters.
  humanURL: https://developer.simplelegal.com/
  baseURL: https://app.simplelegal.com/api
  tags:
  - Matter
  tags_raw:
  - Matters
  properties:
  - type: OpenAPI
    url: openapi/simplelegal-matters-api-openapi.yml
  - type: Documentation
    url: https://developer.simplelegal.com/
  - type: Website
    url: https://www.simplelegal.com/
  - type: Pricing
    url: https://www.simplelegal.com/pricing
  - type: Integrations
    url: https://www.simplelegal.com/integrations
  - type: Rules
    url: https://raw.githubusercontent.com/api-evangelist/simplelegal/refs/heads/main/rules/simplelegal-rules.yml
  - type: Vocabulary
    url: https://raw.githubusercontent.com/api-evangelist/simplelegal/refs/heads/main/vocabulary/simplelegal-vocabulary.yml
- aid: simplelegal:simplelegal-payments-api
  name: SimpleLegal Payments API
  description: The Payments API from SimpleLegal — 1 operation(s) for payments.
  humanURL: https://developer.simplelegal.com/
  baseURL: https://app.simplelegal.com/api
  tags:
  - Payments
  properties:
  - type: OpenAPI
    url: openapi/simplelegal-payments-api-openapi.yml
  - type: Documentation
    url: https://developer.simplelegal.com/
  - type: Website
    url: https://www.simplelegal.com/
  - type: Pricing
    url: https://www.simplelegal.com/pricing
  - type: Integrations
    url: https://www.simplelegal.com/integrations
  - type: Rules
    url: https://raw.githubusercontent.com/api-evangelist/simplelegal/refs/heads/main/rules/simplelegal-rules.yml
  - type: Vocabulary
    url: https://raw.githubusercontent.com/api-evangelist/simplelegal/refs/heads/main/vocabulary/simplelegal-vocabulary.yml
- aid: simplelegal:simplelegal-users-api
  name: SimpleLegal Users API
  description: The Users API from SimpleLegal — 1 operation(s) for users.
  humanURL: https://developer.simplelegal.com/
  baseURL: https://app.simplelegal.com/api
  tags:
  - User
  tags_raw:
  - Users
  properties:
  - type: OpenAPI
    url: openapi/simplelegal-users-api-openapi.yml
  - type: Documentation
    url: https://developer.simplelegal.com/
  - type: Website
    url: https://www.simplelegal.com/
  - type: Pricing
    url: https://www.simplelegal.com/pricing
  - type: Integrations
    url: https://www.simplelegal.com/integrations
  - type: Rules
    url: https://raw.githubusercontent.com/api-evangelist/simplelegal/refs/heads/main/rules/simplelegal-rules.yml
  - type: Vocabulary
    url: https://raw.githubusercontent.com/api-evangelist/simplelegal/refs/heads/main/vocabulary/simplelegal-vocabulary.yml
- aid: simplelegal:simplelegal-vendors-api
  name: SimpleLegal Vendors API
  description: The Vendors API from SimpleLegal — 2 operation(s) for vendors.
  humanURL: https://developer.simplelegal.com/
  baseURL: https://app.simplelegal.com/api
  tags:
  - Vendors
  properties:
  - type: OpenAPI
    url: openapi/simplelegal-vendors-api-openapi.yml
  - type: Documentation
    url: https://developer.simplelegal.com/
  - type: Website
    url: https://www.simplelegal.com/
  - type: Pricing
    url: https://www.simplelegal.com/pricing
  - type: Integrations
    url: https://www.simplelegal.com/integrations
  - type: Rules
    url: https://raw.githubusercontent.com/api-evangelist/simplelegal/refs/heads/main/rules/simplelegal-rules.yml
  - type: Vocabulary
    url: https://raw.githubusercontent.com/api-evangelist/simplelegal/refs/heads/main/vocabulary/simplelegal-vocabulary.yml
common:
- type: CapabilityMap
  url: capabilities/simplelegal-capability-edges.yml
  name: SimpleLegal Business Capability Map
- type: AgenticAccess
  url: agentic-access/simplelegal-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/simplelegal-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/simplelegal-domain-security.yml
- type: Authentication
  url: authentication/simplelegal-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/simplelegal
- type: Website
  url: https://www.simplelegal.com/
- type: Documentation
  url: https://developer.simplelegal.com/
- type: Blog
  url: https://www.simplelegal.com/blog/
- type: Parent Company
  url: https://www.onit.com/products/elm/simplelegal/
- type: GitHub
  url: https://github.com/SimpleLegal
- type: Support
  url: https://support.simplelegal.com/
- type: CounselGO Vendor Portal
  url: https://www.simplelegal.com/counselgo
- type: Legal Requests
  url: https://info.simplelegal.com/legal-requests-datasheet
- type: Login
  url: https://app.simplelegal.com/
- type: SecurityTxt
  url: well-known/simplelegal-security.txt
- type: WellKnown
  url: well-known/simplelegal-well-known.yml
- type: Security
  url: security/simplelegal-vulnerability-disclosure.yml
integrations:
- name: Strategic Alliances
- name: Become a Partner
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-merged-from:
- simple-legal

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