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 7 Complete, well-documented, and agent-ready

Perk Travel & Spend APIREST API for Perk travel, expense, invoice, trip, cost-center, event, and card data. Authenticate with an a...70.2 StayingAPI Agent SkillsPublished portable SKILL.md agent skill in the stayingapi/travel-skills GitHub repo, referenced from the SD...68.6 StayingAPI MCP ServerHosted MCP server (Streamable HTTP, OAuth 2.1/PKCE) exposing 7 read-only tools mapping 1:1 to the REST endp...68.6 Booking.com Contacts APIThe Connectivity Contacts endpoint manages the contact records attached to a property on Booking.com, letti...66.6 Booking.com Historical Reservations APIRetrieve a property's historical reservation details to initialise or reconcile reservation data for revenu...66.6 Booking.com Property Health APIA read-only JSON API for connectivity providers that returns property health and status data, explaining wh...66.6 Booking.com Status APIThe Status API reports the current operational status of monitored Demand API endpoints, grouped by endpoin...66.6

Strong 4 Solid coverage with minor gaps

2s Travel APIThe travel API from 2s — 2 operation(s) for travel.62.7 ReefAPI MCP ServerHosted MCP server over streamable-HTTP with 5 discovery-first tools (search_engines, get_catalog, get_engin...60.7 FAA NAS Status Airport Status Information FeedUnauthenticated XML feed of national airspace system status — ground stop programs, ground delay programs, ...59.0 SAP Concur APIAPIs for travel and expense management including expense reporting, travel booking, and invoice processing.58.3

Developing 22 Usable, with meaningful gaps to close

Skedulo Travel APIThe Travel API from Skedulo — 1 operation(s) for travel.53.9 CompTeam Travel APIThe Travel API from CompTeam — 13 operation(s) for travel.53.5 Traveloka Connect - Connectivity APIOpenTravel (OTA) 2017B XML connectivity API for channel managers, property-management systems and hotel tec...52.0 Climatiq Travel APIEmissions from passenger travel and accommodation.50.0 PeopleSoft Expenses APIDelivered REST API endpoints for expense report management including fetching expense reports by status, cr...47.9 Aisle Travel APIAirports and their transport options.47.4 CJ Product Search APIGraphQL API for product discovery, product feeds and catalog management across advertiser feeds. Ten querie...45.8 Cork & Curve MCP ServerRemote streamable-HTTP Model Context Protocol server (registry name com.corkandcurve/wine-travel) exposing ...45.2 Diners Club International Customer ServiceDiners Club International customer service capability offered to Diners Club franchisees and partners throu...44.8 Discover Airport Lounge & Travel ProgramDiscover Airport Lounge & Travel Program provides exclusive access to premium airport lounges worldwide, of...44.8 Discover ATM LocatorDiscover ATM Locator is a user-friendly tool that allows cardholders to easily find nearby ATMs where they ...44.8 Discover Country AcceptanceDiscover Country Acceptance is a financial institution that specializes in providing loans to individuals i...44.8 Discover Currency ConverterDiscover Currency Converter is a user-friendly tool that allows individuals to easily convert between diffe...44.8 Discover Tip EtiquetteDiscover Tip Etiquette is a platform designed to educate individuals on the proper etiquette and practices ...44.8 Discover Travel GuidesDiscover Travel Guides is a comprehensive travel planning and booking service that helps travelers create u...44.8 Airbnb Webhooks APIThe Airbnb Webhooks API enables connectivity partners to receive real-time notifications when events occur ...44.1 SK Telecom Puzzle Domestic Travel APIDomestic travel analytics — traveller volume by destination, in-region dwell time, and traveller characteri...43.8 Concur Travel Receipts APIExposes receipt requests to inform E-Receipt partners which E-Receipts to send to SAP Concur and for which ...42.3 SAP Concur Travel APIREST API for managing travel itineraries, bookings, and travel profiles. Supports searching for travel opti...42.3 Bifröst Orbit APIBifröst Orbit API as documented publicly: 26 operations. Contract generated from the documentation by API E...42.2 Travel + Leisure RSS FeedsRSS feeds for Travel + Leisure, the brand that also seeds the publicly-traded Wyndham Destinations spin-off.41.9 TripSavvy RSS FeedsRSS feeds for TripSavvy, the travel guides brand.41.9

Thin 46 Limited public surface area

Sabre Air Booking APISabre Air Booking API enables flight booking, passenger name record (PNR) creation and management, seat sel...38.7 Sabre Booking Management APISabre Booking Management API provides unified management of multi-segment travel reservations including fli...38.7 Sabre Cars APISabre Cars API provides car rental search, availability, rate shopping, reservation, and management APIs fo...38.7 Sabre Destination Content APISabre Destination Content API provides destination guides, points of interest, geo data, and travel inspira...38.7 Sabre Rail APISabre Rail API provides rail ticket search, booking, and management capabilities connecting to over 30 rail...38.7 Oracle Expenses APIAPI for managing employee expenses, expense reports, and reimbursements.38.4 WestJet Direct Connect APIWestJet's IATA New Distribution Capability (NDC) direct-connect interface for travel sellers, offered in ND...37.5 Departi MCP APIDeparti's Model Context Protocol server (JSON-RPC 2.0 over HTTP, server version 3.2.0) for AI agents, chatb...37.4 Travel Advisories APIThe State Department publishes travel advisory levels (Level 1-4) for every country. The machine-readable s...34.7 Autoura Experience APIThe Autoura Experience API provides access to tourism content including cuisine guides, destination informa...33.7 Autoura MCP ServerAutoura's hosted remote Model Context Protocol server, the surface it builds for AI agents first. One endpo...33.7 SteadyAPIREST/JSON API providing stock market, options, crypto, real estate, sports, e-commerce, social media, trave...31.7 CTM Portal Host APIThe private back-end API for CTM Portal, CTM's single sign-on customer portal. It is not documented, not an...30.9 Compare Beaches Around the WorldBeach Information gives you searchable beach records, local rules, amenities, conditions, and tide forecast...30.7 Find & Compare Film Festivals Around the WorldFestival Listings gives you searchable data on festivals, their categories, countries, deadlines, dates, fe...30.7 Find Nearby Places in US by Category APISearch places by category around a latitude and longitude, with optional radius and result limits. Useful f...30.7 Find Nearby places In US APIFind places near a latitude and longitude, with optional radius and result limit. Useful for local search, ...30.7 Find US Places in Bounding Box APIFind places inside a latitude-longitude box, with optional result limits. Useful for map search, regional f...30.7 Public Holidays APIGet public holidays by country and year, plus the supported country list. Use it for business-day logic, sc...30.7 Retrieve NOAA Weather Alerts APIFetch active NOAA weather alerts for a two-character area code. Useful for dashboards, notifications, and l...30.7 Retrieve NOAA Weather Point Metadata APILook up NOAA point metadata from latitude and longitude. Useful for coordinate-based location enrichment an...30.7 Search US Places APISearch places with a query string and optional result limit. Useful for place lookup, map search, and locat...30.7 US Reverse Location Lookup APIReverse geocode lat/lon coordinates with an optional search radius. Get a flexible JSON result for map, del...30.7 Country Information PagesPer-country pages covering entry/exit requirements, local laws, safety, health, and U.S. embassy contacts.29.3 Smart Traveler Enrollment Program (STEP)Voluntary enrollment system for U.S. citizens traveling or residing abroad to receive embassy alerts.29.3 State Department Travel AdvisoriesCountry-by-country travel advisories (Levels 1-4) issued by the Bureau of Consular Affairs, with RSS distri...29.3 Travel World A2A AgentAgent-to-Agent surface declared by the A2A 1.0 agent card at https://travel.augworlds.ai/.well-known/agent-...28.5 Travel World MCP ServerRemote Model Context Protocol server (Streamable HTTP) at https://travel.augworlds.ai/mcp. Clients authenti...28.5 MyRealTrip Partner APIMarketing-partner REST API for MyRealTrip. Search flights (domestic and international, lowest-fare calendar...28.4 Rakuten Travel Area Class APIReturns Rakuten Travel's hierarchical Japanese area classification (prefecture / region / detail), used to ...28.3 Rakuten Travel Hotel Chain List APIReturns the list of hotel chains available on Rakuten Travel, used to scope searches to a specific brand.28.3 Rakuten Travel Hotel Detail Search APIReturns full hotel detail records including amenities, addresses, images, and access information for one or...28.3 Rakuten Travel Hotel Ranking APIReturns top-ranked Rakuten Travel hotels by area and category for trend, bestseller, and recommendation dis...28.3 Rakuten Travel Keyword Hotel Search APIFull-text keyword search across Rakuten Travel hotel inventory, with filters for area, price, and rating.28.3 Rakuten Travel Simple Hotel Search APILightweight keyword and area search over Rakuten Travel's Japanese hotel inventory, returning hotel name, l...28.3 Rakuten Travel Vacant Hotel Search APISearches for hotels with vacancy for given check-in and check-out dates, party composition, and budget filt...28.3 Groupon Tours and Attractions APIREST contract connecting a tours, activities and attractions reservation system to Groupon's point of sale,...28.1 Trainline Global APITrainline Partner Solutions' wholesale rail and coach distribution API, sold to travel sellers, OTAs, TMCs ...28.1 trivago Hotel Search (MCP + direct API)Public Model Context Protocol connector (search_hotels) plus an invite-only direct hotel-search API deliver...27.6 EHI Rental APIsThe Rental business line of the EHI API Marketplace, covering Enterprise Rent-A-Car's network of neighborho...27.1 Turneo v2 APIREST booking API for searching experiences, retrieving options and availability, and assembling and confirm...27.1 Worldia APIWorldia production REST API. An API Platform (Symfony) deployment that content-negotiates application/vnd.w...26.8 Grab For Business Partner APIThe Grab For Business Partner API supports corporate travel, expense, and HR platforms that need to provisi...26.5 Travelport TripServices Flights APIRESTful JSON API providing end-to-end air travel workflows including search, price, book, ticket, cancel, a...26.4 Travelport TripServices Pay APIRESTful JSON payments API enabling online travel agencies to perform credit card authorizations, address va...26.4 Travelport TripServices Stays APIRESTful JSON API for hotel search, availability, rules, reservation management, and modification across 180...26.4

Emerging 14 Early or largely undocumented

Property Data APIThe Starwood Property Data API provided detailed information about individual hotel properties including ro...26.0 SPG Loyalty APIThe Starwood Preferred Guest (SPG) Loyalty API provided programmatic access to the SPG loyalty program, ena...26.0 Flix APIThe partner-facing Flix API, published through the Flix Developer Portal. Documentation covers API referenc...25.5 BorderScoutMachine-payable US border-crossing queries over x402. Ranks all 85 US ports of entry by all-in time - the d...24.0 Everway APIProgrammatic access to Everway's travel itinerary management API. Allows retrieval and management of forwar...23.1 Breeze Airways NDC GatewayThe Breeze Airways NDC gateway is the airline's direct-connect distribution API for accredited travel partn...20.9 Southwest Airlines Flight APIThe Southwest Airlines internal flight booking API powers the southwest.com website for searching and booki...20.3 eAPIS — Advance Passenger Information SystemA CBP web-based application for commercial and private carriers to electronically submit inbound and outbou...19.2 Agent Bench Travel MerchantSeller agent for flight search and travel checkout, exposed on one host through two protocol doors: A2A JSO...17.0 Blockskye APILive production API host operated by Blockskye, discovered by probe. The host answers as a Fastify service ...16.7 PeopleSoft Expenses APIREST API for expense reporting, reimbursements, and travel management.16.2 Darwinbox APIREST API for Darwinbox HRMS covering employee management, attendance, recruitment, organizational managemen...12.4 China On-Site Video Service (A2A agent)A2A agent operated by Lei Zhang: you provide a Google Maps link or coordinates of any place in China and a ...11.9 Tuniu Open Platform APITuniu Open Platform (途牛开放平台) supplier and retail-partner integration API. Suppliers publish and manage trav...11.0

Minimal 9 Almost no public developer surface

Delta API SuiteThe Delta API Suite is a partner-facing collection of APIs covering flight search, flight offers and order ...10.9 Rome2Rio Autocomplete APIThe Rome2Rio Autocomplete API provides place-name suggestions as a user types, returning a ranked list of m...10.7 Rome2Rio Geocode APIThe Rome2Rio Geocode API resolves a place-name or address string to a canonical Rome2Rio place record with ...10.7 Rome2Rio Search APIThe Rome2Rio Search API returns multi-modal door-to-door travel routes between any origin and destination w...10.7 Travel Journey API PlatformPlatform of APIs supplying travel and journey intelligence derived from BT's network and Active Intelligenc...10.7 9flats APIThe 9flats read API over the marketplace's listing data: search places, fetch a place with its photos, pric...10.6 Persefoni Integration HubPersefoni's Integration Hub connects the CMAP platform to enterprise systems so emissions-relevant activity...10.4 SnapTravel Partner Search APIThe partner-facing hotel search API operated by Super.com under its original SnapTravel brand. The host is ...8.9 Corpay Workforce Lodging & TravelCorpay's lodging and corporate travel offering for workforces with project, crew, and contractor lodging ne...6.0

Companies reaching this through an API (22)

These companies publish an API, specification or operation carrying “Travel” 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.

Score breakdown

Frequency

71.3

log-scaled weighted occurrences

Breadth

6.9

spread across providers

Quality lift

19.7

mean composite of providers using it

Cohesion

20.1

strength of nearest seed neighbor

Where this tag sits

536 providers carry this tag directly, and 602 counting the 11 narrower tags below — 66 more to reach.

Accommodation 26 providers Flights 58 providers GDS 17 providers Lodging 11 providers NDC 17 providers Online Travel Agency 11 providers Travel Management 14 providers Hotels 141 providers Airlines 63 providers Car Rental 33 providers Corporate Travel 31 providers

Where this tag comes from

Provider tag536

Api tag101

Openapi tag5

Openapi op tag27

Markets provisional

Kin Score markets whose measured providers carry this tag. Share is the fraction of the market's measured providers that carry it — it describes the market, not this tag.

Market	Share of the market's providers
Travel and Airline Distribution	92%
OCTO Tours, Activities & Attractions Connectivity (members, known implementations, self-certification)	79%
Hospitality Technology (hotels, PMS, channel managers)	40%
Rail Sales and Distribution (OSDM, railway union, EU railway licences)	35%
Air Traffic and Aviation Data (manned aviation, ATM, airport suppliers)	32%

Cohort brief

Auto-generated

The 496 providers in the APIs.io catalog tagged Travel, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers

496

of 536 on the roster

Mean Kin Score

20.5

-3.6 vs catalog 24.1

Mean Agent Readiness

-2.1 vs catalog 14.1

Spread

0–82

median 14.7 · σ 15.6

How the 496 split by band

Exemplar 4Strong 15Developing 50Thin 86Emerging 174Minimal 167

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Discoverability	58.5	59.1	-0.6	496
Contract Governance	8.4	9.7	-1.3	496
Access Clarity	26.7	30	-3.3	496
Contract Quality	14.8	18.6	-3.8	496
Operational Transparency	8.5	13.2	-4.7	496
Developer Ergonomics	19.2	24.5	-5.3	496

A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.

What this cohort publishes

Artifact	This cohort	Catalog	Difference
MCP server (any)	20%	18%	+2
MCP server (first-party)	18%	16%	+2
Agent Skills	0%	0%	0
OAuth scopes	11%	13%	-2
Security	100%	99%	+1
Arazzo workflows	1%	1%	0
Governance rules	30%	36%	-6

mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.

Top by Kin Score

1 Oracle Hospitality 82
2 Perk 70.2
3 StayingAPI 68.6
4 Booking.com 66.6
5 Pliant 64.5
6 Engine 64
7 ReefAPI 60.7
8 Federal Aviation Administration 59
9 Wego 59
10 Airalo 58.4

Work with this as data

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Tools for tags

7 MCP tools reach this

find_tagsBrowse and filter every tag in the catalog.
get_cohortThis tag as a scored cohort — every provider carrying it, with scores.
cohort_statsPRO — the distribution across this tag: mean, median, band split, adoption rates.
cohort_rankingsPRO — the leaderboard, on composite AND agent-readiness axes.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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Travel

Providers using this tag (536)

APIs with this tag (102)