ChEMBL data API

4 endpoints for ChEMBL: search, record, mechanism, target. One API key, one JSON schema, as MCP tools or REST.

Endpoints

Call any of them over MCP with call_endpoint and its path, or over REST.

Endpoint	Returns	Credits	Cache
searchGET /v1/chembl/search	ChEMBL molecules matching a name or keyword, with ChEMBL id, formula and development phase.	1	2 min
recordGET /v1/chembl/record	One ChEMBL record: title, creators, type, doi, license and download counts.	1	10 min
mechanismGET /v1/chembl/mechanism	Mechanisms of action recorded for one ChEMBL molecule, each linking the target it acts on.	5	30 min
targetGET /v1/chembl/target	One ChEMBL drug target: name, type, organism and the protein components with their accessions.	1	15 min

Connect your agent over MCP

Remote MCP server: https://data.openkrill.app/mcp with your key in the x-api-key header.

Claude Code · Run in a terminal

claude mcp add --transport http krilldata \
  https://data.openkrill.app/mcp \
  --header "x-api-key: YOUR_API_KEY"

Cursor · Add to ~/.cursor/mcp.json

{
  "mcpServers": {
    "krilldata": {
      "url": "https://data.openkrill.app/mcp",
      "headers": {
        "x-api-key": "YOUR_API_KEY"
      }
    }
  }
}

Claude Desktop · Add to claude_desktop_config.json

{
  "mcpServers": {
    "krilldata": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote",
        "https://data.openkrill.app/mcp",
        "--header",
        "x-api-key:${API_KEY}"
      ],
      "env": {
        "API_KEY": "YOUR_API_KEY"
      }
    }
  }
}