OpenSincera MCP Server

A Model Context Protocol (MCP) server that provides access to the OpenSincera API for retrieving publisher metadata, verification information, and advertising quality analytics.

Overview

OpenSincera is a platform that provides transparency and verification data for digital advertising publishers. This MCP server allows AI assistants and other tools to access OpenSincera's publisher information, including verification status, metadata, operational metrics, device-level ad quality signals, and competitive benchmarking.

Features

• Publisher Lookup: Search for publishers by domain or Publisher ID
• Metadata Retrieval: Get detailed publisher information including verification status, categories, and operational metrics
• Device-Level Metrics: Compare mobile vs. desktop A2CR, ads in view, ad refresh rates, and more
• Competitive Benchmarking: Compare a publisher against similar publishers side-by-side
• Media Evaluation: Score and rank multiple publishers for advertiser media selection
• Health Monitoring: Check the status of the OpenSincera API connection
• Error Handling: Comprehensive error handling with detailed error messages
• Input Validation: Robust input validation using Zod schemas

Installation

Install the package globally using npm:

npm install -g opensincera-mcp-server

Prerequisites

• Node.js 18.0.0 or higher
• OpenSincera API key

Setup

1. Clone the repository:

git clone https://github.com/miyaichi/opensincera-mcp-server.git
cd opensincera-mcp-server

2. Install dependencies:

npm install

3. Build the project:

npm run build

4. Set up environment variables:

export OPENSINCERA_API_KEY="your-api-key-here"
export OPENSINCERA_BASE_URL="https://open.sincera.io/api"  # Optional
export OPENSINCERA_TIMEOUT="10000"  # Optional (milliseconds)

Usage

Running the Server

npm start

Development

npm run dev

Configuration with Claude Desktop

Add the following to your Claude Desktop configuration file, depending on your installation method.

The file is located at:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%/Claude/claude_desktop_config.json

Option 1: If installed globally

If you installed the package globally via npm install -g, the command is directly available in your system's path.

{
  "mcpServers": {
    "opensincera": {
      "command": "opensincera-mcp-server",
      "env": {
        "OPENSINCERA_API_KEY": "your-api-key-here"
      }
    }
  }
}

Option 2: If using a local clone

If you cloned the repository locally, you must provide the full path to the script. Remember to replace /path/to/ with the actual absolute path to the project directory.

{
  "mcpServers": {
    "opensincera": {
      "command": "node",
      "args": ["/path/to/opensincera-mcp-server/dist/index.js"],
      "env": {
        "OPENSINCERA_API_KEY": "your-api-key-here"
      }
    }
  }
}

Example Prompts for Claude Desktop

Once configured, you can use these natural language prompts in Claude Desktop:

Basic Health Check

Check the OpenSincera API connection status

Publisher Domain Lookup

Get publisher information for yahoo.com from OpenSincera

Detailed Analysis Request

Analyze the publisher metrics for cnn.com and explain:
- Their verification status
- Ad to content ratio and what it means
- Supply chain complexity
- Overall advertising quality

Device-Level Comparison

Show me the mobile vs desktop ad quality metrics for nytimes.com

Competitive Benchmarking

Compare businessinsider.com against its similar publishers

Mobile-Focused Media Evaluation

Evaluate these publishers for a mobile branding campaign:
- nytimes.com
- washingtonpost.com
- reuters.com
Use device: mobile

Publisher ID Lookup

Get detailed information for OpenSincera Publisher ID 2737

Business Context Questions

I'm considering running ad campaigns on forbes.com.
Can you check their OpenSincera profile and tell me:
- Is this a verified publisher?
- What's their ad refresh rate and is it good or bad?
- How many supply paths do they have?
- Would you recommend this publisher for quality ad placement?

These prompts will automatically trigger the appropriate OpenSincera MCP tools and return formatted responses with detailed metric explanations.

Available Tools

get_publisher_metadata

Get publisher metadata from OpenSincera API.

Parameters:

• publisherId (optional): Publisher ID to search for
• publisherDomain (optional): Publisher domain to search for
• limit (optional): Maximum number of results (1-100)
• offset (optional): Number of results to skip

Note: Either publisherId or publisherDomain must be provided.

Example:

{
  "publisherDomain": "example.com"
}

get_publisher_by_domain

Get a single publisher by domain name.

Parameters:

• domain (required): Publisher domain to search for

Example:

{
  "domain": "example.com"
}

get_publisher_by_id

Get a single publisher by Publisher ID.

Parameters:

• publisherId (required): Publisher ID to search for

Example:

{
  "publisherId": "12345"
}

compare_publishers

Compare a publisher against its similar publishers (competitive benchmark). Retrieves the target publisher and its OpenSincera-curated similar publishers, then generates a side-by-side comparison of key metrics.

Parameters:

• domain (required): Publisher domain to benchmark
• device (optional): Device type to use for metric comparison — overall (default), mobile, or desktop

Example:

{
  "domain": "businessinsider.com",
  "device": "mobile"
}

evaluate_media

Score and rank multiple publisher domains for advertiser media selection. Each publisher receives a score (0–100) based on ad quality metrics, supply chain health, and identity coverage, weighted by campaign goal.

Parameters:

• domains (required): List of publisher domains to evaluate
• campaignGoal (optional): branding, performance, or balanced (default)
• language (optional): Output language — en (default) or ja
• device (optional): Device type to use for scoring — overall (default), mobile, or desktop

Example:

{
  "domains": ["nytimes.com", "washingtonpost.com", "reuters.com"],
  "campaignGoal": "branding",
  "device": "desktop"
}

health_check

Check the health status of the OpenSincera API connection.

Parameters: None

Response Format

Publisher Metadata Response

{
  "publishers": [
    {
      "publisherId": "1",
      "publisherName": "Business Insider",
      "ownerDomain": "insider-inc.com",
      "domain": "businessinsider.com",
      "status": "active",
      "lastUpdated": "2026-04-14T01:00:25.419Z",
      "categories": [],
      "verificationStatus": "verified",
      "parentEntityId": 59072,
      "similarPublishers": [41, 67, 405],
      "deviceMetrics": {
        "mobile": {
          "avgAdsToContentRatio": 0.265,
          "maxAdsToContentRatio": 1.0,
          "minAdsToContentRatio": 0.0,
          "avgAdUnitsInView": 1.611,
          "maxAdUnitsInView": 4.0,
          "averageRefreshRate": 58.441,
          "maxRefreshRate": 420.0,
          "minRefreshRate": 5.0,
          "percentageOfAdSlotsWithRefresh": 98.78
        },
        "desktop": {
          "avgAdsToContentRatio": 0.231,
          "maxAdsToContentRatio": 1.0,
          "minAdsToContentRatio": 0.0,
          "avgAdUnitsInView": 2.577,
          "maxAdUnitsInView": 9.0,
          "averageRefreshRate": 81.096,
          "maxRefreshRate": 590.0,
          "minRefreshRate": 5.0,
          "percentageOfAdSlotsWithRefresh": 84.99
        }
      },
      "metadata": {
        "description": "Business Insider tells the global tech, finance...",
        "primarySupplyType": "web",
        "avgAdsToContentRatio": 0.249,
        "avgAdsInView": 2.088,
        "avgAdRefresh": 72.489,
        "totalUniqueGpids": 946,
        "idAbsorptionRate": 0.5,
        "avgPageWeight": 27.843,
        "avgCpu": 254.671,
        "totalSupplyPaths": 118,
        "resellerCount": 69,
        "slug": "business-insider"
      }
    }
  ],
  "totalCount": 1,
  "hasMore": false
}

Health Check Response

{
  "healthy": true,
  "timestamp": "2026-04-14T10:00:00Z"
}

Environment Variables

Variable	Description	Default	Required
OPENSINCERA_API_KEY	Your OpenSincera API key	-	Yes
OPENSINCERA_BASE_URL	OpenSincera API base URL	https://open.sincera.io/api	No
OPENSINCERA_TIMEOUT	Request timeout in milliseconds	10000	No

Error Handling

The server provides comprehensive error handling for common scenarios:

• Authentication errors (401): Invalid or missing API key
• Authorization errors (403): Insufficient permissions
• Not found errors (404): Publisher not found
• Rate limiting (429): API rate limit exceeded
• Network errors: Connection issues or timeouts
• Validation errors: Invalid input parameters

Development

Scripts

• npm run build - Build the TypeScript project
• npm run dev - Run in development mode with hot reload
• npm test - Run tests
• npm run lint - Run ESLint
• npm run format - Format code with Prettier

Project Structure

src/
├── index.ts                 # Main MCP server entry point and tool definitions
├── opensincera-service.ts   # OpenSincera API client and data models
├── metadata-descriptions.ts # Field descriptions and formatted output
└── analysis.ts              # Scoring, comparison, and evaluation logic

Contributing

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Add tests for new functionality
5. Run the test suite
6. Submit a pull request

License

This project is licensed under the MIT License - see the LICENSE file for details.

Support

For issues related to this MCP server, please open an issue on GitHub.

For OpenSincera API issues, please contact OpenSincera support directly.

Changelog

v1.0.4

• Added device_level_metrics support: mobile and desktop breakdowns for A2CR, ads in view, ad refresh rate (avg/min/max), and percentage of ad slots with refresh
• Added compare_publishers tool: side-by-side competitive benchmark against similar publishers
• Added evaluate_media tool: score and rank multiple publishers by campaign goal (branding/performance/balanced)
• Added device parameter to compare_publishers and evaluate_media for mobile/desktop-specific analysis
• Added analysis.ts module for scoring and reporting logic

v1.0.3

• Added publisher comparison and rating features
• Updated publisher metadata structure with owner_domain, domain, parent_entity_id, and similar_publishers

v1.0.2

• Version bump and stability improvements

v1.0.0

• Initial release
• Basic publisher lookup functionality
• Health check endpoint
• Comprehensive error handling
• Input validation