Apperio
Apperio is a legal spend management and matter management platform for in-house legal teams and the law firms they work with. It connects directly to law-firm time-and-billing systems to give continuous, real-time visibility into billed and unbilled ("work in progress") legal spend, benchmarking to negotiate rates, and AI-assisted e-billing review against Outside Counsel Guidelines. The Apperio REST API exposes the same secure data that powers the platform's analytics — legal-spend analytics, matter (engagement) and invoice discovery, matter tagging, and e-billing invoice approval workflows — across its two-sided business/law-firm model. Apperio is a Seedcamp portfolio company and is now part of Persuit.
Real signal across most facets with visible, nameable gaps — the contract exists but is thin, or the portal is good while governance and commercial terms are absent.
API Evangelist profiles Apperio the way a machine reads it — 16 machine-readable artifacts across 1 API, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Apperio scores 44.8/100 (developing), with a separate agent-readiness read of 29/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-10 · rubric v0.20.0
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title="Apperio on API Evangelist — API profile and Kin Score">
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</a>More shapes, themes and sizes → · Score as JSON · How badges work
How we profile Apperio
Each block below is one kind of artifact we hold for Apperio. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 5
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Apperio Analytics API
A set of non resource based endpoints that power various components within Apperio. These endpoints primarily support discovery and data investigation.
Apperio E-billing API
The e-billing endpoints provide access to the e-billing invoices in Apperio. They allow you to retrieve information about the invoices and the approval workflow, and also to app...
Apperio Filter API
The filter endpoints provide resource discovery in Apperio. This has two basic mechanisms. Firstly there are the resource discovery endpoints. These are: * `/api/v1/filter/engag...
Apperio Matter information API
A set of endpoints returning information about a specific matter.
Apperio Users API
The users endpoints allow you to manage your API tokens. Tokens are used to authenticate requests to the Apperio API. You can list your existing tokens, delete tokens that are n...
Open Collections 6
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
API Collection
OPEN COLLECTIONApperio API Documentation Analytics API
OPEN COLLECTIONApperio API Documentation Analytics E-billing API
OPEN COLLECTIONApperio API Documentation Analytics Filter API
OPEN COLLECTIONApperio API Documentation Analytics Matter information API
OPEN COLLECTIONApperio API Documentation Analytics Users API
OPEN COLLECTIONRate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Apperio Rate Limits
RATE LIMITSSecurity Posture 3
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for Apperio — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 4
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 4
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 5
Pagination, idempotency, versioning, errors, and events
Access & Security 4
Authentication, authorization, and security posture
Operate 4
Status, limits, changes, and where to get help
Commercial 2
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
Other 1
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/apperio · machine-readable index on apis.io
This is an independent, third-party profile of Apperio, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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