# Kayak

**Canonical:** https://apis.io/providers/kayak/  
**Website:** https://www.kayak.com/  
**APIs profiled:** 0

KAYAK is a free travel metasearch engine that searches hundreds of travel sites at once so travelers can compare and find the lowest available prices on flights, hotels, rental cars, and vacation packages, with an extensive filtering system for narrowing results. Founded in 2004 and part of Booking Holdings, KAYAK operates a family of global travel brands (including momondo, Cheapflights, HotelsCombined, SWOODOO, checkfelix and Mundi) across 60+ international sites in 25+ languages. Beyond consumer metasearch it offers KAYAK for Business, a Flight Tracker, an Explore destination-discovery tool, and KAYAK AI trip-planning. KAYAK is a metasearch and price-comparison engine rather than an online travel agency — bookings are completed with the airline, hotel, car-rental company, or travel agency. This profile documents KAYAK's public discovery, AI, and security surface; KAYAK does not currently operate a public self-serve developer API program.

## Kin Score — 20.4 / 100 (emerging)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+1.1 from 19.3).

| Facet | Score |
|---|---|
| Discoverability | 68.5 |
| Contract Quality | 0.0 |
| Governance | 18.2 |
| Contract Governance | 18.2 |
| Operational Transparency | 15.8 |
| Developer Ergonomics | 7.1 |
| Commercial Clarity | 39.5 |
| Access Clarity | 39.5 |

## Agent readiness — 2.6 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | yes |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## Security (3)

- **Kayak Domain Security** — TLSv1.3 · DMARC
- **Kayak Vulnerability Disclosure** — Hackerone · security.txt · contact published
- **Kayak Trust Center** — SOC 2 Type II, PCI DSS, GDPR, CCPA, SOX

## Tags

Company, Travel, Metasearch, Flights, Hotels, Car Rental, Travel Search, Price Comparison, Booking Holdings, Artificial Intelligence

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/kayak/). Scores are computed from the provider's own public artifacts under a published rubric.