# Viator

**Canonical:** https://apis.io/providers/viator/  
**Website:** https://www.viator.com/  
**APIs profiled:** 9

Viator is a Tripadvisor company and the largest online marketplace for tours, activities and travel experiences, headquartered in the United States and listing more than 300,000 bookable products across roughly 2,500 destinations. It sits on the demand side of the travel distribution chain as an aggregator and reseller of third-party operator inventory, and on the supply side as the channel counterparty that tour operators' reservation systems connect into. Its API posture is unusually open for travel: the full Viator Partner API v2 OpenAPI, the legacy v1 affiliate and merchant specifications, the Viator Reservation System (supplier) API and four Postman collections are all published without a login at docs.viator.com, and Basic Access affiliate keys are issued self-serve at no cost on account creation. Everything beyond that is gated - Full Access, Full Access plus Booking, Merchant and supplier connectivity all require qualification by Viator and, for transactional integrations, passing a two-part front-end and back-end certification. No open travel standard is referenced anywhere in the specifications: the contract is entirely Viator-proprietary, product identifiers are Viator-internal, and partners are contractually required to prevent search engines indexing Viator reviews and unique content.

## Kin Score — 51.4 / 100 (developing)

Scored 2026-08-17 under rubric 0.11.0. Trend: flat (+0.0 from 51.4).

| Facet | Score |
|---|---|
| Discoverability | 72.2 |
| Contract Quality | 65.4 |
| Governance | 11.5 |
| Operational Transparency | 31.6 |
| Developer Ergonomics | 66.8 |
| Commercial Clarity | 44.7 |

## Agent readiness — 60.6 (agent-native)

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

## APIs (9)

- **Viator Partner Products API** — Product content and catalogue ingestion for the Viator Partner API v2 - full product detail, bulk retrieval, incremental modified-since ingestion, the product tag taxonomy, book...
- **Viator Partner Availability API** — Real-time availability and price checking plus availability-schedule retrieval for a single product, in bulk, or incrementally by modification date, so partners can hold a local...
- **Viator Partner Bookings API** — Transactional booking surface - cart and single-item hold and book, booking status, cancel reasons, cancellation quote and cancellation, amendment check, quote and amend, and th...
- **Viator Partner Payments API** — Checkout-session payment account endpoint used by Full Access plus Booking affiliate partners to pass traveller payment details to Viator in a PCI-compliant way when Viator rema...
- **Viator Partner Attractions API** — Attraction search and attraction detail endpoints, letting partners build attraction landing pages and tie Viator's bookable products back to the places they visit.
- **Viator Partner Auxiliary API** — Supporting reference and content services for the Partner API v2 - free-text search across products, destinations and attractions, bulk location resolution, exchange rates, prod...
- **Viator Reservation System API** — The supplier-side connectivity contract, formerly the Viator Supplier API. This specification is inverted - it defines the endpoints a tour operator's reservation system or book...
- **Viator Merchant API v1** — The legacy v1 merchant-partner specification still published by Viator, exposing taxonomy, product, photo, review, availability, pricing-matrix, booking, voucher and cancellatio...
- **Viator Affiliate API v1** — The legacy v1 affiliate-partner specification, a non-transactional subset covering utility services, destination and category taxonomy, product and attraction search, product de...

## MCP servers (1)

- **viator-mcp.yml**

## Agentic access (1)

- **Viator Agentic Access** — 96 operations · 58 acting

## Security (2)

- **Viator Authentication** — apiKey · 3 schemes
- **Viator Domain Security** — TLSv1.3 · HSTS · DMARC

## Tags

Travel, United States, Tours and Activities, Experiences, OTA, Booking, Distribution, Marketplace, Affiliate, Hospitality

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