Open Library work ratings API

The Open Library rating summary for one work: average, count and the one-to-five star split.

Ask your agent

“Call openlibrary/work/ratings with key OL45804W and summarize what comes back.”

Works in any MCP client connected to https://data.openkrill.app/mcp. Install in one line.

Path: openlibrary/work/ratings
MCP tool: call_endpoint
Credits: 1
Cache: 30 min

Parameters

keystring, required	Work key, such as OL45804W or works/OL45804W

Response

data.resources[] uses the same keys as every other platform: author, engagement, metadata, with Open Library-only fields under extras. A failed upstream call is never billed.

More Open Library tools

MCP tool call

{
  "name": "call_endpoint",
  "arguments": {
    "path": "openlibrary/work/ratings",
    "params": {
      "key": "OL45804W"
    }
  }
}

curl

curl "https://data.openkrill.app/v1/openlibrary/work/ratings?key=OL45804W" \
  -H "x-api-key: YOUR_API_KEY"

Response

{
  "success": true,
  "platform": "openlibrary",
  "endpoint": "openlibrary/work/ratings",
  "data": {
    "resources": [
      { "id": …, "title": …, "text": …, "url": …,
        "author": {…}, "engagement": {…},
        "metadata": {…}, "extras": {…} }
    ]
  },
  "credits_used": 1,
  "cached": false
}