Midpage

Midpage is an AI-powered legal research and drafting platform built on its own US legal database of millions of court opinions, statutes, and regulations spanning federal and state jurisdictions. Its developer products expose this corpus through a REST case-law API (semantic, keyword, and hybrid search; opinion retrieval; citator treatments), a Model Context Protocol (MCP) server for AI agents, and direct SQL read-replica access.

Midpage publishes 4 API contracts indexed on the APIs.io network, including Opinions API, Search API, User API, and 1 more. Tagged areas include Legal, Case Law, Legal Research, Search, and Artificial Intelligence.

The Midpage catalog on APIs.io includes 1 Spectral governance ruleset.

Midpage’s developer surface includes pricing, engineering blog, authentication, documentation, and 7 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

30.4/100 thin ▬ flat Agent 23/100 agent aware Front door AI 5/6 prominent Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessPaid

1 published contract

Legal Case Law Legal Research Search Artificial Intelligence

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 30.4/100 · thin

Contract Quality 10.1 / 19

Developer Ergonomics 3.6 / 15

Access Clarity 3.8 / 15

Operational Transparency 0.7 / 10

Contract Governance 1.2 / 9

Discoverability 5.0 / 8

Regulatory Posture 0.8 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 23/100 · 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 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

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

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/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented) Ask about this →

8 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Developer Ergonomics scores 23.8 — up to +15.2 composite points Ask about this →
Access Clarity scores 25.5 — up to +14.9 composite points Ask about this →
Operational Transparency scores 7.1 — up to +12.1 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

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 the provider profile at artifacts.apis.io/midpage/apis.yml: open an issue on github.com/api-evangelist/midpage to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

APIs 4

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

Midpage MCP Server

Remote Model Context Protocol server (OAuth-authenticated) that gives AI assistants like Claude, ChatGPT, and Perplexity source-grounded legal research tools - search, findInOpi...

Midpage Opinions API

The Opinions API from Midpage — 1 operation(s) for opinions.

Midpage Search API

The Search API from Midpage — 1 operation(s) for search.

Midpage User API

The User API from Midpage — 1 operation(s) for user.

Open Collections 4

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

Midpage Legal Database Opinions API

OPEN COLLECTION

Midpage Legal Database Opinions Search API

OPEN COLLECTION

Midpage Legal Database Opinions User API

OPEN COLLECTION

Midpage Legal Database API

OPEN COLLECTION

Midpage API pricing

Prices published by Midpage, read 2026-10-07 from www.midpage.ai/pricing.

Plan	Price
Professional	$100/month (billed monthly) Includes: Full coverage, manual research tools, agentic research tools, AI citator, connections, plugins, agen
Law Student	$25/month Includes: Full coverage, manual research tools, agentic research tools, AI citator, connections, plugins, AI r

Plan details, limits and sources →

Rate limits

Search Page Size: 100 results
Bulk Opinion Reads: 100 items
Keyword / Hybrid Total Results: 10000 results

Compiled by API Evangelist, not yet checked against Midpage's documentation. All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Midpage Plans Pricing

2 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Midpage Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Midpage Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Midpage API Rules

52 rules · 50 error-severity 1 warn-severity 1 info-severity

SPECTRAL

Security Posture 2

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

Midpage Authentication

http · 1 scheme

SECURITY

Midpage Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

Midpage Agentic Access

3 operations

3 operations · 0 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

Blog

Blog

LinkedIn

Website

Website

Source (apis.yml)

aid: midpage
url: https://raw.githubusercontent.com/api-evangelist/midpage/refs/heads/main/apis.yml
name: Midpage
kind: company
description: Midpage is an AI-powered legal research and drafting platform built on its own US legal database of millions
  of court opinions, statutes, and regulations spanning federal and state jurisdictions. Its developer products expose this
  corpus through a REST case-law API (semantic, keyword, and hybrid search; opinion retrieval; citator treatments), a Model
  Context Protocol (MCP) server for AI agents, and direct SQL read-replica access.
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: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/midpage.png
x-docs-platform: scalar
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-04
tags:
- Legal
- Case Law
- Legal Research
- Search
- Artificial Intelligence
tags_raw:
- Legal
- Case Law
- Legal Research
- Search
- AI
created: '2026-06-21'
modified: '2026-10-06'
specificationVersion: '0.23'
apis:
- aid: midpage:mcp
  name: Midpage MCP Server
  tags:
  - MCP
  - Agents
  tags_raw:
  - MCP
  - Model Context Protocol
  - Agents
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://www.midpage.ai/integrations
  baseURL: https://app.midpage.ai/mcp/v3
  properties:
  - url: https://www.midpage.ai/integrations
    type: Documentation
  description: Remote Model Context Protocol server (OAuth-authenticated) that gives AI assistants like Claude, ChatGPT, and
    Perplexity source-grounded legal research tools - search, findInOpinion, analyzeOpinion, and preview docket tools (analyzeDocketReport,
    analyzeDocketFiling). Versioned tool contracts are served at /mcp/v1, /mcp/v2, and /mcp/v3.
- aid: midpage:midpage-opinions-api
  name: Midpage Opinions API
  description: The Opinions API from Midpage — 1 operation(s) for opinions.
  humanURL: https://midpage-docs.apidocumentation.com/
  baseURL: https://app.midpage.ai/api/v1
  tags:
  - Opinions
  properties:
  - type: OpenAPI
    url: openapi/midpage-opinions-api-openapi.yml
  - type: Documentation
    url: https://midpage-docs.apidocumentation.com/
- aid: midpage:midpage-search-api
  name: Midpage Search API
  description: The Search API from Midpage — 1 operation(s) for search.
  humanURL: https://midpage-docs.apidocumentation.com/
  baseURL: https://app.midpage.ai/api/v1
  tags:
  - Search
  properties:
  - type: OpenAPI
    url: openapi/midpage-search-api-openapi.yml
  - type: Documentation
    url: https://midpage-docs.apidocumentation.com/
- aid: midpage:midpage-user-api
  name: Midpage User API
  description: The User API from Midpage — 1 operation(s) for user.
  humanURL: https://midpage-docs.apidocumentation.com/
  baseURL: https://app.midpage.ai/api/v1
  tags:
  - User
  properties:
  - type: OpenAPI
    url: openapi/midpage-user-api-openapi.yml
  - type: Documentation
    url: https://midpage-docs.apidocumentation.com/
common:
- type: Pricing
  url: https://www.midpage.ai/pricing
- url: https://www.midpage.ai/blog
  type: Blog
- type: AgenticAccess
  url: agentic-access/midpage-agentic-access.yml
- type: DomainSecurity
  url: security/midpage-domain-security.yml
- type: Authentication
  url: authentication/midpage-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/midpage
- type: Website
  url: https://www.midpage.ai/
- type: Documentation
  url: https://midpage-docs.apidocumentation.com/
- type: Plans
  url: plans/midpage-plans-pricing.yml
- type: RateLimits
  url: rate-limits/midpage-rate-limits.yml
- type: FinOps
  url: finops/midpage-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Midpage API — frequently asked questions

Does Midpage have an API?

Yes. APIs.io lists 4 APIs from Midpage, including Midpage MCP Server, Midpage Opinions API and Midpage Search API, and 1 more.

Is there an OpenAPI specification for the Midpage API?

Yes. APIs.io indexes 3 OpenAPI specifications for Midpage, each linked for download from this page.

How do I authenticate with the Midpage API?

Midpage uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as Midpage Authentication.

How much does the Midpage API cost?

Midpage publishes its prices; its Professional plan is $100/month (billed monthly) as of 2026-10-07. APIs.io lists 2 pricing plans for Midpage, with each plan's price, limits and inclusions under Pricing on this page.

Is the Midpage API ready for AI agents?

Midpage has a Kin Score of 30.4 out of 100 (thin) and an Agent Readiness score of 22.9 (agent-aware), scored by API Evangelist on 2026-11-13.

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