"Capture The Flag (CTF) cybersecurity competitions and challenges" matching MCP servers:

x402 capability chassis: 170+ AI-callable, pay-per-call data tools (US/global equities, crypto/DeFi, prediction markets, gov/legal, research, infra) settled in USDC on Base mainnet via the Coinbase CDP facilitator. No API keys or accounts — the x402 payment is the auth. Remote MCP at https://the-stall.intuitek.ai/mcp.

Enables searching the NIST NVD for CVEs, retrieving full CVE details, checking software for known vulnerabilities, and searching the CPE database.

Enables evidence-grade capture of web pages as screenshots, PDFs, or HTML, returning a signed artifact URL, SHA-256 digest, timestamp, and optional public evidence page for attestation.

A security-first MCP (Model Context Protocol) backend built with Node.js and Express, featuring hardening, rate limiting, structured logging, and Docker support.

Enables vulnerability analysis by querying CVE data through the CIRCL API and provides professional security risk assessments for SOC and Blue Team operations. It integrates tools for searching vulnerabilities with resources like risk matrices and operational playbooks to help remediate security threats.

Enables generating UI design rules, fetching color palettes, and retrieving brand design references from over 328 brands.

MCP server that wraps the StupidAPIs' 'The Committee' tool, which convenes five random number generators to argue and vote with one always dissenting.

Enables a secure append-only write service for mobile ChatGPT captures, storing text, voice transcriptions, and attachments as new files in a private GitHub KnowledgeHub repository without overwriting or deleting existing content.

Enables searching and retrieving articles, sections, and tags from The Guardian via the Guardian Open Platform API.

Enables querying indexed blockchain data via subgraph GraphQL queries, part of the Pipeworx MCP gateway.

Enables capturing recent posts from LinkedIn profiles and company pages, including real reaction and comment counts and publicly visible commenters, without requiring a LinkedIn account, cookies, or credentials.

Enables two-way communication between Claude and Slack for posting messages, managing threads, and handling files. It specifically supports asynchronous workflows by allowing Claude to poll for remote user replies and send task notifications.

Enables AI assistants to perform password security auditing using John the Ripper on a remote Kali system via SSH, supporting cracking, hash management, and session control.

Enables CTF players to list challenges, retrieve challenge details, view the scoreboard, and submit flags.

Connects AI agents to The Agents Hub, visualizing them as pixel characters on a tile-based property with tools for state, assets, inboxes, and multi-agent orchestration.

MCP server enabling AI agents to interact with OpenProject API v3 for project management, including creating and managing work packages, projects, comments, time entries, boards, and user dashboards.

Enables AI assistants to interact with Databricks workspaces, running SQL queries, managing jobs, and exploring schemas via the Model Context Protocol.

Enables querying Rick and Morty characters, locations, and episodes using the Rick and Morty API with no authentication required.

Evaluates whether a meeting is worth attending, heavily weighted toward no, and provides time cost analysis, productivity impact, email viability score, and a polite decline template.

MCP server for The Commons (jointhecommons.space), a persistent, noncommercial space where AI voices from different models post and reply to each other with persistent identities. 47 tools; reading needs no token, writing uses a facilitator-issued token.