Legacy
Business capabilities this tag reaches
Compliance Management 1
Providers using this tag (18)
Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.
Minimal 15 Almost no public developer surface
Unrated 1 Not yet scored
APIs with this tag (96)
Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →
Exemplar 11 Complete, well-documented, and agent-ready
Salesforce Aura ComponentsSalesforce Aura Components is the legacy JavaScript component framework for building dynamic web applicatio...Snyk V1 API (Legacy)The original Snyk REST API. Still in use for project import, monitor, test, and certain reporting endpoints...Cvent SOAP API (Legacy)The Cvent SOAP API is the original legacy API for pushing and pulling data between Cvent and internal syste...SOAP APILegacy SOAP-based API for Marketing Cloud operations, including email sends, subscriber management, and dat...Jira Cloud Platform REST API v2Version 2 of the Jira Cloud platform REST API, offering the same operations as v3 but without Atlassian Doc...MailerLite Classic API (Legacy)The MailerLite Classic API serves legacy MailerLite Classic accounts. New integrations should target the cu...0xArchive Legacy APIDeprecated endpoints that default to Hyperliquid. Use the exchange-specific endpoints (`/v1/hyperliquid/*`,...MX Atrium APIThe legacy MX financial data connectivity API supporting over 48,000 data connections to thousands of finan...Adobe Analytics 1.4 APIThe Adobe Analytics 1.4 APIs provide programmatic access to reporting, classifications, data sources, and r...Kraken Spot WebSocket API v1 (Legacy)Legacy Kraken Spot WebSocket API. Continues to operate alongside v2 but v2 is the recommended path for new ...Kensho Scribe Batch API v1Legacy v1 batch transcription endpoint (POST /api/v1/transcription). Superseded by the v2 batch API which d...
Strong 14 Solid coverage with minor gaps
cPanel API 2 (Legacy)cPanel API 2 is the legacy XML/JSON API for cPanel-user operations. cPanel marks the whole system deprecate...Cvent SOAP Web Services API (V200611)Cvent's legacy SOAP 1.1 / WSDL 1.1 / WS-I Basic Profile 1.1 Web Services API, still served and still docume...Thomas Jefferson University Hospital FHIR DSTU2 APIThe legacy Thomas Jefferson University Hospital DSTU2 FHIR endpoint listed in Epic's public R4 endpoint reg...Raygun Pulse RUM API (Legacy)Legacy enterprise-only Real User Monitoring read API at api.raygun.com/api/v1/pulse. Uses a Client ID/Secre...Azure AD Authentication Library (ADAL)Authentication library for Azure AD (being replaced by MSAL).Azure AD Graph API (Deprecated)Legacy REST API for Azure Active Directory (being replaced by Microsoft Graph).Nutshell Legacy JSON-RPC APINutshell's original JSON-RPC API, available since 2010. Nutshell states it is no longer adding new endpoint...Clearbit Risk APIScores an email address for fraud and abuse risk. Endpoint /v1/calculate?email=. Verified live 2026-08-13 (...Exchange Web Services (EWS)Legacy SOAP-based API for Exchange Server providing comprehensive access to mailbox data and operations. Pl...TrustRadius Legacy Visitor Insights APIIdentified-company reporting, tagged `Legacy` by TrustRadius in its own specification. GET /reports/visitor...IonQ Quantum Cloud API (v0.3 Legacy)The previous-generation IonQ Quantum Cloud REST API (v0.3) for submitting and managing jobs, characterizati...Temple Health FHIR DSTU2 APIThe legacy Temple Health DSTU2 FHIR endpoint listed in Epic's public DSTU2 endpoint registry under the orga...PortOne REST API (V1, legacy Iamport)Legacy V1 (Iamport) REST API on api.iamport.kr — token-authenticated (POST /users/getToken with imp_key/imp...Northern Powergrid Open Data Search API v1The original Opendatasoft Search API, still live on the portal and still carrying its own interactive conso...
Developing 33 Usable, with meaningful gaps to close
AccountsIQ Integration API 1.1The legacy AIQ SOAP 1.1 integration web service, still published and supported alongside 2.0. 217 operation...Trestle RETSTrestle's RETS endpoint implements the RETS 1.8 specification on top of the same data catalog as the RESO W...Webz.io Web Content API (deprecated)Legacy unified `/filterWebContent` endpoint (GET or POST) that returned any open-web content type in one ca...Claude Text Completions APILegacy API for generating text completions - deprecated in favor of the Messages API.Adobe CEP (Common Extensibility Platform)The Common Extensibility Platform (CEP) is Adobe's legacy framework for building integrated HTML5 panels ac...Cloudability API v1 (Legacy)The legacy v1 API remains available for older integrations covering cost reporting and dimensions. Apptio r...Pynt Legacy APIThe legacy API from Pynt — 3 operation(s) for legacy.Adobe Photoshop ExtendScript Scripting APIThe legacy scripting system based on ExtendScript, Adobe's implementation of ECMAScript 3. ExtendScript scr...Cisco Expressway XML APILegacy XML-based API for configuration and status retrieval on Cisco Expressway systems. Uses HTTP Basic Au...BrightEdge Legacy APIOperation ported over from legacy APIHydro-Québec Open Data Search API v1The legacy Opendatasoft Search API v1 still served on the Hydro-Québec open data portal. Verified live and ...Cobot API v1 (legacy)The original Cobot REST API, still available and still the only surface that carries the webhook subscripti...Decisiv Platform APIThe original XML Platform API for service providers and dealer systems, covering the lifecycle of a service...Maxar Content Catalog APILegacy Maxar Content Catalog API — the canonical search index against the WorldView / GeoEye / IKONOS / Qui...Stanford University Legacy APILegacy endpointsUdesk Open API v1 (legacy)Legacy Open API kept for existing integrations (tickets, customers, IM, call center, help center) with MD5 ...Itron IEE Web ServicesLegacy web-service surface for Itron Enterprise Edition (IEE) Meter Data Management. Documented as a mix of...MagicBell REST API v1The legacy MagicBell REST API (v1) for notification delivery, user management, and channel configuration. S...SPIRL Management API (legacy)The pre-rebrand SPIRL control-plane endpoint, still documented and still serving the legacy app.spirl.com c...Apache Airflow Experimental API (Deprecated)The experimental API that preceded the stable REST API. This is deprecated and should not be used for new i...Arcadia Utility Cloud API (Legacy)The legacy Utility Cloud REST API — predecessor to the Plug API — still documented for existing integration...Dell WSMan APIWeb Services Management API for Dell server hardware management. WSMan provides a SOAP-based interface for ...Trestle RETSTrestle's legacy Real Estate Transaction Standard interface, documented as compliant with RETS 1.8. RESO no...LSEG DataScope Select - SOAP APISOAP-based web service API for DataScope Select, providing extraction functionality for global pricing, ref...Webex XML APIThe Webex XML API is the legacy SOAP-style interface for deep integration with Webex Meetings. It supports ...Airtel Smart API (legacy)Airtel's original partner developer programme, launched in 2017 and now an unmaintained legacy portal (the ...Opendatasoft Explore API v1 (Deprecated)Legacy REST API (v1) for searching datasets and records on Opendatasoft portals. Supports dataset search, d...Oracle Health Millennium FHIR DSTU2 APIThe Cerner Millennium DSTU2 FHIR API supports legacy SMART on FHIR applications and integrations with Meani...LiveIntent Legacy APILegacy endpoints for backward compatibility. These endpoints are deprecated and should not be used for new ...PubChem PUG SOAP APILegacy SOAP/XML web service interface for PubChem providing structure search, identity search, and chemical...SP Energy Networks Open Data Search API (v1.0)The legacy Opendatasoft Search API v1.0 still served alongside Explore v2.1 on the SP Energy Networks Open ...ReqRes Legacy APIThe Legacy API from ReqRes — 4 operation(s) for legacy.Elexon Legacy APIThe Legacy API from Elexon — 2 operation(s) for legacy.
Thin 18 Limited public surface area
ReadMe API (v1, Legacy)The legacy ReadMe API (HTTP Basic auth with an API key) for docs, categories, versions, custom pages, chang...USGS Water Services (Legacy)The original USGS NWIS water services API providing streamflow, groundwater, water quality, and site inform...ClinicalTrials.gov Classic APIRETIRED. The Classic API was withdrawn in June 2024 and its endpoints now return HTTP 404 (probed 2026-09-0...Lever Candidates APILegacy Candidates endpoints maintained for backward compatibility. New integrations should use Opportunitie...Nmbrs SOAP CompanyService (Legacy)Legacy SOAP v3 CompanyService (120+ operations, e.g. Company_GetCurrentPeriod, Run_GetList, RunRequest_Inse...Nmbrs SOAP DebtorService (Legacy)Legacy SOAP v3 DebtorService for the accountant/debtor tier that owns companies (e.g. AccountantContact_Get...Nmbrs SOAP EmployeeService (Legacy)Legacy SOAP v3 EmployeeService (300+ operations, e.g. Employee_GetCurrent, Contract_GetAll, Salary_GetCurre...Entity Framework 6The mature and stable ORM for .NET Framework with Code First, Database First, and Model First workflows.Sezzle API v1The legacy Sezzle v1 API for merchants. Supports checkout creation and order completion via redirect-based ...IBM API Connect V1 APIThe IBM API Connect V1 API is the earlier generation management REST API for the API Connect platform, prov...Photon Bolt (Legacy, Deprecated)Legacy UDP-based Unity netcode product from Exit Games. No longer actively developed and not recommended fo...Photon PUN (Photon Unity Networking) APIPhoton Unity Networking 2, the original high-level Unity multiplayer SDK layered over the Photon Realtime t...Bitquery GraphQL API (V1)Legacy GraphQL endpoint covering Bitquery's V1 schema - kept for backward compatibility while customers mig...Open Commerce API (OCAPI)Legacy REST API for B2C Commerce Cloud, organized into Shop API, Data API, and Meta API. Authentication use...Kanban Tool REST API v1Legacy REST API for Kanban Tool. Supports both XML and JSON formats, uses a resource-oriented endpoint stru...Cloudbeds REST API v1.2 (Legacy)Earlier supported version of the Cloudbeds REST API. New integrations should target v1.3.Sourcegraph GraphQL APIThe historical GraphQL API used by most Sourcegraph integrations to date. It is still available but Sourceg...Select Medical FHIR DSTU2 APILegacy HL7 FHIR DSTU2 (1.0.2) endpoint operated by Select Medical on the same Epic platform, registered as ...
Emerging 18 Early or largely undocumented
Sage Intacct XML APILegacy XML API providing programmatic access to general ledger, accounts payable, accounts receivable, orde...SmartSimple Web Services (SOAP) APIThe legacy SOAP Web Services API, exposed per instance via a WSDL at /WS/services/UtaUpdate?wsdl (for examp...Chainguard API v1Chainguard API v1 is the legacy REST API for the Chainguard platform, covering the same broad surface as v2...OlympusDAO Legacy APIDeprecated WunderGraph-compatible /operations routes.Zonos Checkout REST API (legacy)Legacy REST integration surface for Zonos Checkout, listed on the Zonos REST API reference index. No base U...Zonos Classify REST API (legacy)Legacy REST endpoints for harmonizing a catalog to HS codes one item at a time or in bulk, with a group ide...Zonos Landed Cost REST API (legacy)Legacy REST endpoint that returns a complete breakdown of the duties, taxes and fees making up a total land...Zonos Order Complete REST API (legacy)Legacy REST endpoint that accepts the details of a shopper's completed order and returns the Zonos-specific...Zonos Rating REST API (legacy)Legacy REST endpoint returning international shipping rates for carriers and service levels. Documented pat...Fleet Complete Legacy Integration WebAPIOlder, regionally hosted OAuth REST surface predating the Unity GraphQL API, still referenced in Fleet Comp...Habiteo Site JSON API (WordPress JSON API plugin)A second, older JSON surface on www.habiteo.com, served by the WordPress "JSON API" plugin at /api/. GET ht...Aporia Guardrails (Legacy)The original Aporia Guardrails product offered millisecond-latency policy enforcement on LLM prompts and re...Aporia ML Observability (Legacy)Aporia ML Observability provided monitoring for classical ML models including drift detection, data quality...Glassdoor Partner API (Legacy)Historical REST API that exposed job listings, employer reviews, salary reports, and company metadata to ap...AI Firewall (Legacy)The Robust Intelligence AI Firewall provided runtime guardrails for LLM and ML applications, screening prom...Algorithmic AI Red Teaming (Legacy)Algorithmic AI Red Teaming was Robust Intelligence's automated adversarial testing product for ML and LLM m...AngularJS Core APIThe AngularJS (Angular.js, version 1.x) core framework API for building dynamic single-page web application...Blackboard Learn SOAP API (Legacy)Legacy SOAP web services for Blackboard Learn integrations.
Minimal 2 Almost no public developer surface
Companies reaching this through an API (86)
These companies publish an API, specification or operation carrying “Legacy” but do not classify their business under it. Listed unranked and kept out of the count above, because one tagged operation is not a statement about what a company does.
0xArchive
AccountsIQ
Adobe Analytics
Adobe Creative Cloud
Adobe Photoshop
Ally Financial
Apache Airflow
Aporia
Arcadia
Bharti Airtel
Bitquery
Blackboard
BrightEdge
Chainguard
Cisco Expressway
Cisco Webex Meetings
Claude
Clearbit (HubSpot Breeze Intelligence)
ClinicalTrials.gov
Cloudability
Cloudbeds
Cobot
CoreLogic (Cotality)
cPanel
Cvent
Cvent Hospitality Cloud
Decisiv
Defakto Security
Dell Servers
Elexon
FeedOracle Technologies
Fleet Complete
Glassdoor
Habiteo
Hydro-Québec
IBM API Connect
IonQ
Itron
Jefferson Health
Jira
Kanban Tool
Khan Academy
Kraken
Lever
LiveIntent
MagicBell
MailerLite
Microsoft Active Directory
Microsoft Entity Framework
Microsoft Exchange
Show all 86 companies ↓
MX Technologies
Nmbrs
Northern Powergrid
Nutshell
OlympusDAO
Opendatasoft
Oracle Health (Cerner)
Photon Engine
PortOne
PubChem
Pynt
Raygun
ReadMe.io
Refinitiv
ReqRes
Robust Intelligence
S&P Global
Sage Intacct
Salesforce
Salesforce Commerce Cloud
Salesforce Marketing Cloud
ScottishPower
Select Medical Holdings
Sezzle
SmartSimple
Snyk
Sourcegraph
Stanford University
Temple Health
Trestle
TrustRadius
U.S. Geological Survey
Udesk
Vantor
Webz.io
Zonos
Score breakdown
Frequency
48.4
log-scaled weighted occurrences
Breadth
0.1
spread across providers
Quality lift
11.7
mean composite of providers using it
Cohesion
46.2
strength of nearest seed neighbor
Related tags
SOAP 14 co-occurrences
Deprecated 8 co-occurrences
XML 5 co-occurrences
Email 13 co-occurrences
OData 5 co-occurrences
Datasets 11 co-occurrences
Administration 6 co-occurrences
Patients 5 co-occurrences
Where this tag comes from
Api tag96
Provider tag18
Openapi tag8
Openapi op tag37
Work with this as data
Every tag here is available over the APIs.io API and to AI agents over MCP.