Arespass MCP Server
The Arespass API provides a robust and specialized service for cryptographic password analysis, specifically designed to quantify the strength of a password by calculating its Shannon entropy.
Quick Start Summary
The Arespass MCP server is a Model Context Protocol bridge that connects AI assistants — including Claude Desktop, Cursor, Windsurf, and VS Code Copilot — to the Arespass API through natural language. It exposes 2 API endpoints as callable tools, such as Metadata about this API: version number, release date and available languages.
Metadata requests are NOT billed.
, The entropy calculator - alias ec -, analyzes a password and calculates its entropy.
Entropy calculator requests are billed.
. No authentication is required — setup takes approximately 30 seconds. The server uses STDIO transport and can be installed by running npx -y @mcp/arespass-net. This integration is sourced from the auto Arespass OpenAPI specification (v1.0) and has a quality score of 28/99 (fair documentation coverage).
Server Details
- Category
- Security
- Authentication
- None
- Endpoints
- 2 operations
- Transport
- STDIO
- Spec Version
- v1.0
- Install Command
npx -y @mcp/arespass-net
Environment Variables
ARESPASS_API_KEYExample: your_arespass_api_key
Top Endpoints
/aboutMetadata about this API: version number, release date and available languages. Metadata requests are NOT billed.
/ecThe entropy calculator - alias ec -, analyzes a password and calculates its entropy. Entropy calculator requests are billed.
One-Click Install
Copy the snippet for your MCP client and paste it in — zero editing required.
Claude Desktop
Add to claude_desktop_config.json
{
"mcpServers": {
"arespass-net": {
"command": "npx",
"args": [
"-y",
"@mcp/arespass-net"
],
"env": {
"ARESPASS_API_KEY": "your_arespass_api_key"
}
}
}
}Cursor
Settings → MCP Servers → Add
{
"mcpServers": {
"arespass-net": {
"url": "https://mcpbridge.org/config/arespass-net.json"
}
}
}Saves as .cursor/mcp.json in the download. Move it to your project root.
VS Code
Use with MCP extension
{
"mcpServers": {
"arespass-net": {
"url": "https://mcpbridge.org/config/arespass-net.json"
}
}
}Endpoints Explorer
Search and browse the 2 operations supported by this server.
Multi-Language Code Examples
Executable code snippets for calling Arespass endpoints in curl, TypeScript, or Python.
curl -X GET "https://api.apis.guru/v2/specs/arespass.net/1.0/about" \ -H "Content-Type: application/json" \ # No auth required
Manual Configuration
Directly add this block to your JSON config file, or use the hosted config registry URL.
{
"mcpServers": {
"arespass-net": {
"command": "npx",
"args": ["-y","@mcp/arespass-net"],
"env": {
"ARESPASS_API_KEY": "your_arespass_api_key"
}
}
}
}Authentication Details
No authentication required. This MCP server runs out-of-the-box.
Documentation Links
Error Handling & HTTP Status Code Matrix
Common status codes, error causes, and resolution steps when invoking Arespass endpoints.
400 Bad RequestCause: Malformed payload parameters or missing required fields.
Resolution: Verify request schema in Endpoints tab before calling tool.
401 UnauthorizedCause: Missing or invalid API key credentials.
Resolution: Set environment variable in MCP client config under env object.
403 ForbiddenCause: Insufficient scope permissions for requested resource.
Resolution: Verify key permissions in developer dashboard.
404 Not FoundCause: Resource URL path or requested entity ID does not exist.
Resolution: Check path variables and parameters.
429 Rate Limit ExceededCause: API rate limit quota exceeded.
Resolution: Implement exponential backoff retry in tool call.
500 Internal ErrorCause: Upstream server runtime fault.
Resolution: Inspect STDIO stderr output for log trace.
Quality Score
Checked against our protocol-compliance rules.
Specification Version: v1.0
Page compiled on: June 13, 2026
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📖 Detailed MCP Integration Guide
A technical breakdown of capabilities, agent workflows, and security/configuration best practices.
GET /about and GET /ec (Entropy Calculation), deliver this functionality in a lightweight, stateless manner. Typical use cases span from enterprise security auditing—where it can be integrated into password policy enforcement tools or SIEM systems for risk assessment—to consumer applications like password managers or online signup flows that aim to provide users with real-time, educational feedback on their password choices, thereby promoting better security hygiene at the point of creation./ec endpoint to assess their unpredictability as passwords," providing a proactive audit of secret sprawl. Furthermore, it could dynamically generate test cases: "Write unit tests for the password validator that include edge-case strings, and use the Arespass tool to confirm that each test string meets the required minimum entropy standard."Similar APIs
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