Legacy
Variants seen in the corpus:
Legacylegacy
Providers using this tag (18)
Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.
Minimal 14 Almost no public developer surface
APIs with this tag (103)
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 10 Complete, well-documented, and agent-ready
Salesforce Aura ComponentsSalesforce Aura Components is the legacy JavaScript component framework for building dynamic web applicatio...SOAP APILegacy SOAP-based API for Marketing Cloud operations, including email sends, subscriber management, and dat...Converis Legacy APIThe Converis Legacy API — filtered info-object retrieval and Pentaho authentication against a Converis inst...MailerLite Classic API (Legacy)The MailerLite Classic API serves legacy MailerLite Classic accounts. New integrations should target the cu...MX Atrium APIThe legacy MX financial data connectivity API supporting over 48,000 data connections to thousands of finan...Cvent SOAP API (Legacy)The Cvent SOAP API is the original legacy API for pushing and pulling data between Cvent and internal syste...Kraken Spot WebSocket API v1 (Legacy)Legacy Kraken Spot WebSocket API. Continues to operate alongside v2 but v2 is the recommended path for new ...Snyk V1 API (Legacy)The original Snyk REST API. Still in use for project import, monitor, test, and certain reporting endpoints...Thomas Jefferson University Hospital FHIR DSTU2 APIThe legacy Thomas Jefferson University Hospital DSTU2 FHIR endpoint listed in Epic's public R4 endpoint reg...Jira Cloud Platform REST API v2Version 2 of the Jira Cloud platform REST API, offering the same operations as v3 but without Atlassian Doc...
Strong 22 Solid coverage with minor gaps
Adobe Analytics 1.4 APIThe Adobe Analytics 1.4 APIs provide programmatic access to reporting, classifications, data sources, and r...Kensho Scribe Batch API v1Legacy v1 batch transcription endpoint (POST /api/v1/transcription). Superseded by the v2 batch API which d...Cvent SOAP Web Services API (V200611)Cvent's legacy SOAP 1.1 / WSDL 1.1 / WS-I Basic Profile 1.1 Web Services API, still served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...cPanel API 2 (Legacy)cPanel API 2 is the legacy XML/JSON API for cPanel-user operations. cPanel marks the whole system deprecate...Dolby.io Communications APILegacy Communications APIs for high-quality WebRTC voice and video conferencing with spatial audio, music m...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...Temple Health FHIR DSTU2 APIThe legacy Temple Health DSTU2 FHIR endpoint listed in Epic's public DSTU2 endpoint registry under the orga...Clearbit Risk APIScores an email address for fraud and abuse risk. Endpoint /v1/calculate?email=. Verified live 2026-08-13 (...Northern Powergrid Open Data Search API v1The original Opendatasoft Search API, still live on the portal and still carrying its own interactive conso...Social Tables Events API (Legacy)The legacy Social Tables Events API provided REST access to events, venues, floor plans, diagrams, and seat...Trestle RETSTrestle's RETS endpoint implements the RETS 1.8 specification on top of the same data catalog as the RESO W...PortOne REST API (V1, legacy Iamport)Legacy V1 (Iamport) REST API on api.iamport.kr — token-authenticated (POST /users/getToken with imp_key/imp...Nutshell Legacy JSON-RPC APINutshell's original JSON-RPC API, available since 2010. Nutshell states it is no longer adding new endpoint...TrustRadius Legacy Visitor Insights APIIdentified-company reporting, tagged `Legacy` by TrustRadius in its own specification. GET /reports/visitor...Zype Analytics API (V2)Legacy V2 analytics surface — stream hours, player requests, engagement, site counts, consumers, subscripti...IonQ Quantum Cloud API (v0.3 Legacy)The previous-generation IonQ Quantum Cloud REST API (v0.3) for submitting and managing jobs, characterizati...Azure AD Authentication Library (ADAL)Authentication library for Azure AD (being replaced by MSAL).Azure AD Graph API (Deprecated)Legacy API for accessing Azure AD (deprecated in favor of Microsoft Graph).Hydro-Québec Open Data Search API v1The legacy Opendatasoft Search API v1 still served on the Hydro-Québec open data portal. Verified live and ...Azure AD Graph API (Deprecated)Legacy REST API for Azure Active Directory (being replaced by Microsoft Graph).Exchange Web Services (EWS)Legacy SOAP-based API for Exchange Server providing comprehensive access to mailbox data and operations. Pl...Cobot API v1 (legacy)The original Cobot REST API, still available and still the only surface that carries the webhook subscripti...
Developing 31 Usable, with meaningful gaps to close
Stanford University Legacy APILegacy endpointsClaude Text Completions APILegacy API for generating text completions - deprecated in favor of the Messages API.AccountsIQ Integration API 1.1The legacy AIQ SOAP 1.1 integration web service, still published and supported alongside 2.0. 217 operation...Adobe CEP (Common Extensibility Platform)The Common Extensibility Platform (CEP) is Adobe's legacy framework for building integrated HTML5 panels ac...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...Itron IEE Web ServicesLegacy web-service surface for Itron Enterprise Edition (IEE) Meter Data Management. Documented as a mix of...Arcadia Utility Cloud API (Legacy)The legacy Utility Cloud REST API — predecessor to the Plug API — still documented for existing integration...Cloudability API v1 (Legacy)The legacy v1 API remains available for older integrations covering cost reporting and dimensions. Apptio r...MagicBell REST API v1The legacy MagicBell REST API (v1) for notification delivery, user management, and channel configuration. S...Airtel Smart API (legacy)Airtel's original partner developer programme, launched in 2017 and now an unmaintained legacy portal (the ...BrightEdge legacy APIOperation ported over from legacy APIDecisiv 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...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...Udesk Open API v1 (legacy)Legacy Open API kept for existing integrations (tickets, customers, IM, call center, help center) with MD5 ...Dell WSMan APIWeb Services Management API for Dell server hardware management. WSMan provides a SOAP-based interface for ...LSEG DataScope Select - SOAP APISOAP-based web service API for DataScope Select, providing extraction functionality for global pricing, ref...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...PubChem PUG SOAP APILegacy SOAP/XML web service interface for PubChem providing structure search, identity search, and chemical...IBM API Connect V1 APIThe IBM API Connect V1 API is the earlier generation management REST API for the API Connect platform, prov...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.USGS Water Services (Legacy)The original USGS NWIS water services API providing streamflow, groundwater, water quality, and site inform...Cisco Expressway XML APILegacy XML-based API for configuration and status retrieval on Cisco Expressway systems. Uses HTTP Basic Au...Trestle RETSTrestle's legacy Real Estate Transaction Standard interface, documented as compliant with RETS 1.8. RESO no...Elexon Legacy APIThe Legacy API from Elexon — 2 operation(s) for legacy.LiveIntent Legacy APILegacy endpoints for backward compatibility. These endpoints are deprecated and should not be used for new ...ClinicalTrials.gov Classic APIRETIRED. The Classic API was withdrawn in June 2024 and its endpoints now return HTTP 404 (probed 2026-09-0...Massey M-API WebService API v1Massey University's own news, events and staff-directory web service. A single endpoint, /api/v1/massey.cfc...
Thin 16 Limited public surface area
Sezzle API v1The legacy Sezzle v1 API for merchants. Supports checkout creation and order completion via redirect-based ...Lever Candidates APILegacy Candidates endpoints maintained for backward compatibility. New integrations should use Opportunitie...ReadMe API (v1, Legacy)The legacy ReadMe API (HTTP Basic auth with an API key) for docs, categories, versions, custom pages, chang...Webex XML APIThe Webex XML API is the legacy SOAP-style interface for deep integration with Webex Meetings. It supports ...Entity Framework 6The mature and stable ORM for .NET Framework with Code First, Database First, and Model First workflows.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...Select Medical FHIR DSTU2 APILegacy HL7 FHIR DSTU2 (1.0.2) endpoint operated by Select Medical on the same Epic platform, registered as ...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...Cloudbeds REST API v1.2 (Legacy)Earlier supported version of the Cloudbeds REST API. New integrations should target v1.3.Kanban Tool REST API v1Legacy REST API for Kanban Tool. Supports both XML and JSON formats, uses a resource-oriented endpoint stru...Sourcegraph GraphQL APIThe historical GraphQL API used by most Sourcegraph integrations to date. It is still available but Sourceg...Sage Intacct XML APILegacy XML-based API for Sage Intacct accounting and financial management, providing broad coverage of ever...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...
Emerging 24 Early or largely undocumented
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...OlympusDAO Legacy APIDeprecated WunderGraph-compatible /operations routes.Chainguard API v1Chainguard API v1 is the legacy REST API for the Chainguard platform, covering the same broad surface as v2...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...Blackboard Learn SOAP API (Legacy)Legacy SOAP web services for Blackboard Learn integrations.Fleet Complete Legacy Integration WebAPIOlder, regionally hosted OAuth REST surface predating the Unity GraphQL API, still referenced in Fleet Comp...API BlueprintAPI Blueprint is a Markdown-based specification language for describing web APIs, originally created by Api...RAML (RESTful API Modeling Language)RAML is a YAML-based modelling language for RESTful APIs, originally created by Mulesoft. RAML 1.0 (2016) i...WSDL / SOAPThe Web Services Description Language (WSDL) is the historical XML-based interface definition language for ...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...Ally Invest API (Legacy / Retired)The legacy Ally Invest brokerage REST API, inherited from Ally's 2016 acquisition of TradeKing. It offered ...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...Glassdoor Partner API (Legacy)Historical REST API that exposed job listings, employer reviews, salary reports, and company metadata to ap...Khan Academy API v1 (Legacy / Internal)Legacy REST API previously documented at api-explorer.khanacademy.org (now redirects). Some endpoints under...AngularJS Core APIThe AngularJS (Angular.js, version 1.x) core framework API for building dynamic single-page web application...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...
Companies reaching this through an API (92)
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.
AccountsIQ
Adobe Analytics
Adobe Creative Cloud
Adobe Photoshop
Ally Financial
Apache Airflow
API Specifications
Aporia
Arcadia
Bharti Airtel
Bitquery
Blackboard
BrightEdge
BrightEdge Technologies
Chainguard
Cisco Expressway
Cisco Webex Meetings
Clarivate
Claude
Clearbit (HubSpot Breeze Intelligence)
ClinicalTrials.gov
Cloudability
Cloudbeds
Cobot
CoreLogic (Cotality)
cPanel
Cvent
Cvent Hospitality Cloud
Cvent Social Tables
Decisiv
Defakto Security
Dell Servers
Dolby.io
Elexon
Fleet Complete
Glassdoor
Habiteo
Hydro-Québec
IBM API Connect
IonQ
Itron
Jefferson Health
Jira
Kanban Tool
Khan Academy
Kraken
Lever
LiveIntent
MagicBell
MailerLite
Show all 92 companies ↓
Massey University
Maxar Technologies
Microsoft Active Directory
Microsoft Azure Active Directory
Microsoft Entity Framework
Microsoft Exchange
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
Sage Intacct Accounting
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
Zonos
Zype
Score breakdown
Frequency
50.7
log-scaled weighted occurrences
Breadth
0.1
spread across providers
Quality lift
6.2
mean composite of providers using it
Cohesion
46.0
strength of nearest seed neighbor
Related tags
SOAP 15 co-occurrences
Deprecated 9 co-occurrences
Dataset 7 co-occurrences
XML 7 co-occurrences
OData 5 co-occurrences
Email 10 co-occurrences
People 6 co-occurrences
REST 25 co-occurrences
Where this tag comes from
Api tag105
Provider tag18
Openapi tag9
Openapi op tag93
Work with this as data
Every tag here is available over the APIs.io API and to AI agents over MCP.