The API Index

Yardi Systems

There is a real, widely used integration surface, but it is one of the most heavily gated in B2B SaaS.

AbacusLaw

AbacusLaw offers an "On Premise Remote API Service" which is a limited, self-hosted API for on-premise installations.

Aconex (Oracle)

Gated, registration-required.

Aderant

No practical API access

Airfarewatchdog

Airfarewatchdog does not publish or offer a public API, developer portal, SDK, webhooks or partner-integration program.

Apartments.com

No public/open API.

Applied Epic

Published developer portal (devcenter.myappliedproducts.com) with documented OAuth 2.0 + REST APIs, plus a legacy Applied Epic SDK.

AspenTech

Fragmented and per-product rather than unified.

athenaCollector

Gated, shared with the broader athenahealth platform.

Athenahealth

No practical API access

AVImark

None, no public developer portal.

Bankrate

No open public/developer API.

Bark

No public/open REST or GraphQL API.

Black Knight

Gated, partner-only developer platform, substantial but not self-serve.

Bloom

No public, documented REST API.

Bluebeam

No practical API access

Boatsetter

No public API.

Bold Penguin

Public developer portal at developers.boldpenguin.com with documented REST API (sales-gated credentials).

BringFido

No public API.

Care.com

No public, self-serve API.

CargoWise

Primarily through the eAdaptor integration layer plus a separate Database Subscription feed:

CCC Intelligent Solutions

Manually-gated REST API with no openly self-serve developer portal.

CDK Global

CDK offers modern REST APIs via their Fortellis platform covering CRM, parts, F&I, digital retail, and payment settling.

Cerner Retail Pharmacy

No public, self-serve developer API for the retail product.

City Sightseeing

No public API.

CloudApp

No practical API access

CMiC

No practical API access

CoConstruct

No practical API access

Collective Health

No practical API access

ConceptDraw

No public REST API.

CoStar

No public/open API for CoStar Suite.

Coupa

Extensive but legacy-feeling and governance-heavy.

CraftJack

No public REST API, no OAuth, no developer portal, no inbound write endpoints, and no documented historical-data export.

DealerSocket

Gated. DealerSocket publishes an APIs landing page at https://dealersocket.com/apis/ describing two API families.

Dentrix

No practical API access

DFIN Venue

No public API.

Dollar Flight Club

No public API.

Draw.io

No traditional REST API.

Duck Creek

APIs exist and are extensively marketed, but no public self-serve developer portal.

Eaglesoft

No practical API access

eClinicalWorks

Gated by partner program.

Eddy

No publicly documented developer API.

Elead CRM

No practical API access

Ellie Mae

Two parallel API platforms, both gated to ICE customers and signed partners.

Ellucian

Via Ellucian Ethos, but customer/partner-gated.

Ellucian Banner

Primarily via Ellucian Ethos Integration, but customer/partner-gated.

Epicor Kinetic

No practical API access

Experity

None, no public developer portal, self-serve keys, sandbox, SDKs, or documented webhooks.

Expertise.com

No public API, no OAuth, no developer portal, no documented REST endpoint catalog, no published webhook spec, and no listed rate limits.

Fabric

No documented public partner API.

FindLaw

No documented public API.

FinThrive

No practical API access

FIS Profile

Through FIS Code Connect (https://codeconnect.fisglobal.com), FIS's centralized API marketplace and gateway.

Fiserv DNA

Gated. DNA exposes a developer surface through three main channels: 1.

Fixr

No public/open API.

Frazer

No public developer API or documentation found.

Galileo

Public developer documentation portal with sales-gated credentials.

Giggster

No public API.

GLCS Channel

No practical API access

Gliffy

No dedicated public REST API for diagram CRUD.

GoHealth

None publicly documented.

Going

No public API.

Google Flights

No public API.

Grasshopper

No public API.

Guidewire

Extensive public REST APIs with partner-gated production access and sandbox.

HealthMarkets

None publicly documented.

HealthPay24

No standalone public developer portal; the product now lives inside Waystar's stack and its own domain redirects to waystar.com.

Hipcamp

No public developer API.

HoneyBook

No public API.

Hotel Tonight

No public consumer-side API.

Hotels.com

No standalone Hotels.com public API.

Hubdoc

No public API.

IDEXX Cornerstone

Gated, no self-serve portal.

IFS

No practical API access

ImproveNet

No public/queryable API for ImproveNet.

inDinero

No public developer API.

Inovalon (ABILITY Network)

No practical API access

Jack Henry Silverlake

Gated and split across multiple surfaces: 1.

Jerry

None publicly documented.

Joist

No practical API access

Jonas Software

Not at the holding-company level, no.

Jumpshare

No documented public REST API.

Justia

No current public, partner or private API is published.

Lawn Love

No practical API access

Lawpath

No current public, partner or private API is published.

Lawyers.com

No public or partner API exists.

LegalMatch

No current public, partner or private API is published.

Lightspeed NXT

Heavily gated and monetized.

LMN

No public REST API and no developer portal.

LoopNet

No public/open API.

Marker.io

Marker.io does NOT currently offer a public REST API.

MaxMyPoint

No public developer API.

Medidata

Gated through Medidata Developer Central.

Meditech

No practical API access

Monosnap

No published public API.

NerdWallet

No public/self-serve developer API.

NetSuite

Extensive but governance-heavy.

OmniGraffle

No public web/REST API.

Oracle PeopleSoft

In multiple coexisting forms.

Outreach

Comprehensive and well-documented at https://developers.outreach.io.

Paro

No public/self-serve developer API.

Pastel

Zapier + outbound webhook only; no public REST API reference.

Patientco

Standalone., No independently maintained Patientco developer API; integration capabilities are now part of Waystar's platform/APIs.

Pawlicy Advisor

No public, self-serve REST/GraphQL API or developer portal could be found.

Paychex

No practical API access

Payment Depot

No standalone Payment Depot API.

PCLaw

PCLaw does not offer a public API.

Peerspace

No public developer API.

Phreesia

None, no developer portal, self-serve keys, sandbox, SDKs, or documented webhooks.

Plowz and Mowz

No public REST or GraphQL API, no developer portal, no OAuth, no published webhooks, no Zapier listing, no Make.com listing, and no SDKs.

Point.me

No public, partner, or developer API.

PowerSchool

Gated, fragmented across acquired product lines, and access-controlled per-customer via the plugin.xml framework.

Principle

No practical API access

Priori Legal

No public API.

project44

No practical API access

Prophet 21 (Epicor)

Customer-hosted and not openly documented.

PTC Windchill

No practical API access

Punchey

No standalone public Punchey API.

Realm

No public/open REST API.

Relativity

Relativity has one of the deepest and most mature developer platforms in legal tech.

Resy

No openly documented, self-serve public API.

Reynolds and Reynolds

Reynolds does not offer a public open API.

RLM Apparel

No practical API access

Roame

No public developer API.

Sabre

No practical API access

Scott's Cheap Flights

No public API.

Secret Flying

No public API.

SelectQuote

None, no public self-serve developer surface.

Sequoia

No public developer portal.

ServiceChannel

No practical API access

SimCorp Dimension

Gated to clients and partners, but with a documented modern REST/streaming API surface.

Simparel

No practical API access

SimplePractice

SimplePractice has an "Enterprise" API for Health Plans scheduling integration, but no general-purpose public API for practitioners.

Skiplagged

No official public API.

SmartAdvocate

No practical API access

SmartAsset

No public/self-serve developer API.

Snapsheet

Sales-gated, no fully public developer portal discoverable.

Sniffspot

No public API.

SocialBee

SocialBee explicitly does not offer a public API.

Spirit Cruises

No public API for spiritcruises.com itself.

Spruce

No public API.

SS&C Advent

Fragmented and mostly partner-gated.

StoreAtMyHouse

No practical API access

Super Lawyers

No public or partner API exists.

Surescripts

No public self-serve API.

Sweeten

No practical API access

Swimply

Swimply does not publish a public API, does not run a developer portal, and does not advertise a partner integration program.

Sympli

No public REST API.

symplr

No practical API access

Tekion

Public, partner-gated, with a self-serve developer portal.