Categories
Explore
Categories
Every category in the Gravity Index with live service counts
GET
Categories
The Index is organized into 22 categories spanning the modern developer stack — from AI/LLM
infrastructure to payments, auth, observability, and everything in between.
Call
GET /categories to get a live count of services per category — or use the
gravity_index_list_categories MCP tool.
Authentication
Send your publisher key as theX-API-Key header or as a platform_api_key query parameter. One of
the two is required; requests without a valid key are rejected with 403.
string
Publisher API key. Alternative to the
platform_api_key query parameter.string
Publisher API key. Alternative to the
X-API-Key header.Response
array
name and service_count for every category, sorted alphabetically.number
Total number of services in the Index.
Example
Counts update whenever new services are added. The snapshot above reflects the initial
public catalog (493 services, April 2026).

