What the API reads, and what it writes

It reads the register: variants with filters and facets, one variant's full sheet with its plate figures, spec groups, prices with their kind and date, media and siblings; makers with their counts; what owners say per pillar with the counts behind each; dealers, workshops and parts shops by PIN code.

It writes one thing: a buyer's enquiry to a dealer, and only with that buyer's consent recorded. That asymmetry is deliberate. Reading the register helps you build something; writing to it would let you put things in front of buyers that nobody verified.

Webhooks tell you when something you care about changed rather than making you poll for it, and a hosted MCP server exposes search, sheets, ratings, dealers and leads as tools to an assistant, with nothing to install.