Hosted API for the OHDSI OMOP vocabularies: search, map and resolve 11M+ medical concepts (SNOMED CT, ICD-10, LOINC, RxNorm). No ATHENA downloads. Includes Python/R/Node SDKs and an MCP server for AI agents (https://mcp.omophub.com). Free tier: 3,000 API calls per month. Docs: https://docs.omophub.com