Developers
Agent-ready construction cost data
Use the public catalog through REST, MCP, OpenAPI, OAuth metadata, llms.txt, and change feeds. The same routes power the product, so integrations test against the real surface. Omnicost Pro is USD 29/month and includes the app, API, and MCP, with 100,000 requests/month at 1,000 requests/minute. There is no overage charge; at the cap the API returns 429.
Core endpoints
GET /api/v1/itemsGET /api/v1/searchGET /api/v1/items/{id}GET /api/v1/feeds/items.atomGET /api/v1/openapi.jsonPOST /api/oauth/tokenREST API
Canonical catalog items, item detail, search, pricing, usage, and developer keys.
MCP server
Streamable HTTP endpoint and discovery metadata for Claude, ChatGPT, Cursor, and custom agents.
OAuth 2 metadata
Protected-resource and authorization-server metadata for agent authentication.
RSS and Atom
Catalog update feeds for crawlers, monitoring, and agent sync jobs.