{"specVersion":"1.0","host":{"displayName":"YTJ Lookup","identifier":"did:web:ytj.23signs.org","url":"https://ytj.23signs.org","description":"Read-only lookup of Finnish companies from PRH YTJ open data: the full Trade Register, refreshed daily from PRH's all_companies dump. No auth, no keys; one paid batch endpoint (MPP, x402)."},"entries":[{"identifier":"urn:air:ytj.23signs.org:api:companies","displayName":"YTJ Lookup API","type":"application/vnd.oai.openapi+yaml","url":"https://ytj.23signs.org/openapi.yaml","description":"OpenAPI 3.1 description of the four endpoints (three free, one paid batch): search by name or business ID (paged), single lookup by business ID, and dataset status. Plain HTTP GET, JSON responses with HATEOAS _links, RFC 9457 errors.","capabilities":["GET /api/v1/companies","GET /api/v1/companies/{businessId}","GET /api/v1/companies/batch (paid)","GET /api/v1/dataset"],"representativeQueries":["what is the business ID of Nokia","look up Finnish company 0112038-9","is Y-tunnus 1463611-4 an active company","which company form does Fortum have","find Finnish companies with Elisa in the name","where is KONE Oyj registered"]},{"identifier":"urn:air:ytj.23signs.org:skill:ytj-lookup","displayName":"YTJ Lookup skill","type":"application/ai-skill+md","url":"https://ytj.23signs.org/SKILL.md","description":"Agent skill with when-to-use guidance, parameters, response and error shapes, known limitations (toiminimi, daily snapshot) and worked examples.","representativeQueries":["how do I query the Finnish trade register from an agent","what does the YTJ lookup API return for a company","why does a valid Y-tunnus return 404 here"]},{"identifier":"urn:air:ytj.23signs.org:agent:ytj-lookup","displayName":"YTJ Lookup agent card","type":"application/a2a-agent-card+json","url":"https://ytj.23signs.org/.well-known/agent-card.json","description":"A2A agent card: REST interface, no authentication, two read-only skills.","representativeQueries":["find an agent that can answer questions about Finnish companies","which Finnish company registry capabilities does this domain expose to agents"]},{"identifier":"urn:air:ytj.23signs.org:server:ytj-lookup","displayName":"YTJ Lookup tool card","type":"application/mcp-server-card+json","url":"https://ytj.23signs.org/.well-known/mcp/server-card.json","description":"MCP-style server card listing the three tools with JSON Schema inputs. There is no hosted MCP transport; the tools map to plain HTTP GET and are also registered in the browser via WebMCP.","representativeQueries":["which tools does the YTJ lookup expose","tool schema for searching Finnish companies"]}]}