Gray Line API
Gray Line integrates partners through the TourCMS Marketplace API: RESTful, XML-only, with HMAC-SHA256 signed requests. Sandbox work is self-serve against test operator 3930; production access goes through Gray Line Connect. Official PHP, Ruby, .NET, and Python libraries exist.
Frequently asked questions
Gray Line scores B+ on Supergood's API Report Card. Gray Line integrates partners through the TourCMS Marketplace API: RESTful, XML-only, with HMAC-SHA256 signed requests. Sandbox work is self-serve against test operator 3930; production access goes through Gray Line Connect. Official PHP, Ruby, .NET, and Python libraries exist.
Gray Line has a workable official integration path. Most engineering teams can build against it directly. Solid API with minor gaps
Gray Line is a global sightseeing and tour brand founded in 1910 in Washington, D.C., today operating as a licensee network with locations in 700+ destinations across roughly 100 countries.
Vertical: misc (closest Sanity taxonomy match: Travel & Expense / POS & Hospitality adjacency, Gray Line sits in 'Tours & Activities,' which is not a first-class Supergood vertical). Consumers browse and book tours directly on grayline.com and locale subdomains (e.g., graylineorlando.com, graylinerome.com), which are WordPress front-ends backed by TourCMS for inventory, availability, pricing, promo codes, and checkout.
Consumer brand: 8/10. Gray Line is one of the most recognized sightseeing brands globally and has been operating for 115+ years. The Palisis case study cites it as the world's largest sightseeing brand. Platform/API ubiquity: 3/10.
For Gray Line / TourCMS: live tour inventory & schedules, real-time availability, pricing & dynamic discounts, promo codes/vouchers, booking records (passenger PII, pickup details, payment tokens), commission ledgers for agents and affiliates, click/booking attribution for affiliates, and per-licensee revenue reporting.
Brand founded 1910 (115 years old). The current digital stack is comparatively modern: WordPress front-end + TourCMS booking engine (relationship formalized via the 2016 Palisis exclusive long-term agreement).
Capterra reviewers note the TourCMS partner/admin UI 'feels as if it wasn't refreshed for the last 10 years', friction during integration QA and partner onboarding. Availability inconsistencies reported by some operators/integrators (cached availability lagging live inventory). Full sourced list under Sources below.
Common alternatives include Big Bus Tours, City Sightseeing Worldwide, Viator (Tripadvisor), GetYourGuide, Klook, Tiqets. Graded alternatives appear under "More from the report card" below.
Supergood's grades measure one thing: can a customer's engineering team get their own data out programmatically? Supergood checks six things (whether a real API exists, how access is gated, data coverage, auth quality, docs and developer experience, and stability) and rolls them into a letter grade. Supergood re-verifies grades, and they only move on evidence.
Not that we could find. As of August 2026 there is no official Gray Line MCP server in any public registry, and no maintained community server we're aware of. We re-verify this periodically — report an inaccuracy below if we missed one.
Not natively. Gray Line doesn't publish an MCP server, so MCP clients like Claude, Cursor, and Codex have nothing to connect to out of the box. If that changes, this page will reflect it.