Hopper
Hopper is a Boston- and Montreal-based travel booking platform and B2B travel fintech provider serving more than 120 million travelers globally. Its consumer app aggregates flights, hotels, rental cars, and homes alongside proprietary price prediction and a family of "for any reason" fintech ancillaries — Price Freeze, Cancel For Any Reason (CFAR), Change For Any Reason, Leave For Any Reason, and Disruption Guarantee. Through its B2B division, Hopper Technology Solutions (HTS), the company licenses those same fintech ancillaries, agentic AI customer service (HTS Assist), white-label travel agency products (HTS Stays, HTS Cars, HTS Packages), and travel loyalty portals to airlines, banks, and travel providers. HTS exposes a documented OAuth2-secured REST API — the HTS Airline API v1.1 — for embedding CFAR and Disruption Guarantee contracts in airline booking flows, with OpenAPI-generated SDKs for Java, .NET, Angular, and iOS, plus a JavaScript SDK for hotel price-freeze integration.
Limited machine-readable signal and partial portal coverage — documentation a human can read, but little a machine or agent can consume without scraping.
API Evangelist profiles Hopper the way a machine reads it — 22 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 — Hopper scores 31.7/100 (thin), with a separate agent-readiness read of 26/100 (agent aware). 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 2026-09-08 · rubric v0.20.0
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How we profile Hopper
Each block below is one kind of artifact we hold for Hopper. 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 12
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.
Hopper Analytics API
In order to measure and continuously improve HTS Ancillaries performance, specific events occurring during a customer session can be sent by the partner airlines using some dedi...
Hopper Authentication API
This API is authenticated with OAuth 2, Client Credentials grant.\ Clients should use their `client_id` and `client_secret` to obtain an `access_token`.\ The `access_token` shou...
Hopper Cancel For Any Reason (CFAR) API
**What is Cancel For Any Reason?** Cancel For Any Reason (CFAR) enables airlines to offer refundability as an ancillary with HTS powering the dynamic pricing and supporting the ...
Hopper Disruption Guarantee (DG) API
**What is Disruption Guarantee?** Disruption Guarantee (DG) offers a premium disruption assistance service to customers in case of flight disruption, including rebooking options...
Hopper Sessions API
Hopper uses a unique ID to correlate API calls and events produced by a user's interaction with an airline application. The duration of the user's interactions is called a "sess...
Hopper Consumer App
Consumer mobile and web app for booking flights, hotels, homes, and cars. Pioneered price prediction, Price Freeze, and flexible cancellation for end travelers. No public API.
HTS Stays
Hopper Technology Solutions lodging e-commerce platform that gives partners access to global hotel inventory with conversion-optimized UX and merchandising. Partner-gated; integ...
HTS Cars
Car rental e-commerce platform from HTS that partners embed for global car rental inventory and booking. Partner-gated.
HTS Packages
Bundled flight + hotel package product from HTS. Partner-gated.
HTS Fintech Ancillaries (Cancel for Any Reason, Disruption Assistance, Seat Upgrades)
Proprietary fintech ancillaries that partners attach to their bookings — Cancel for Any Reason (airlines and hotels), Disruption Assistance for Any Reason, and HTS Seat Upgrades...
HTS Travel Loyalty Portals (Banks)
Travel loyalty portals powering bank travel programs, used by partners such as Capital One Travel and RBC. Partner-gated.
HTS Assist (Agentic AI Customer Service)
Agentic AI built specifically for airline and travel customer service, delivering end-to-end autonomous resolutions via voice and chat. Sold to airlines and travel partners; int...
Scroll within the panel for all 12 ·
Open Collections 7
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 COLLECTIONAirline API
OPEN COLLECTIONAirline Analytics API
OPEN COLLECTIONAirline Analytics Authentication API
OPEN COLLECTIONAirline Analytics Cancel For Any Reason (CFAR) API
OPEN COLLECTIONAirline Analytics Disruption Guarantee (DG) API
OPEN COLLECTIONAirline Analytics Sessions API
OPEN COLLECTIONScroll within the panel for all 7 ·
Security Posture 2
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 Hopper — 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.
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Build 1
SDKs, sample code, and the tooling you integrate with
Access & Security 2
Authentication, authorization, and security posture
Operate 1
Status, limits, changes, and where to get help
Company 6
The organization behind the API
Other 9
Properties that don't map to a standard resource type
Scroll within the panel for all 9 ·
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This is an independent, third-party profile of Hopper, 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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