"How to Query a Knowledge Graph Using an Ontology" matching MCP connectors:

Hosted, OAuth-gated endpoint for quantakrypto's post-quantum crypto tools: scan code for quantum-vulnerable cryptography (RSA/ECDH/ECDSA/DH) and get NIST ML-KEM/ML-DSA/SLH-DSA migration guidance over authenticated HTTP — nothing to install. Sign-in required (Google/GitHub/email). Same tools as the open-source @quantakrypto/mcp server; source at github.com/quantakrypto/pqc-tools.

Is a wallet frozen by Tether/Circle? Free freeze checks + full history, screening & KYT. 9 chains.

Pay-per-call safety checks for AI agents: screen a crypto address or URL before you transact.

Read-only MCP server for turva.dev, an agent-readiness audit and advisory service.

The PropelAuth Integration MCP Server helps you and your favorite AI agent integrate PropelAuth as quickly and easily as possible into your project. Whether you're integrating PropelAuth into your Next.js project or your FastAPI backend, the Integration MCP Server will ensure your AI agent has the best context possible for a successful integration.

Query Microsoft Patch Tuesday security updates (MSRC) with EPSS and CISA KEV enrichment

Per-transaction crypto trade validator for AI agents. Returns deterministic PROCEED / CAUTION / BLOCK verdicts using WaveGuard anomaly detection, history checks, and rug-pull risk analysis.

Query WHOIS/RDAP information for domains, IP addresses, CIDR prefixes and ASNs. Self-hostable.

Verify a skill, tool, or package for malicious behavior before your agent installs it. Hosted.

Deterministic gate for AI agents: ALLOW/DENY a step before it runs, sealed to a verifiable receipt.

Trust verdict for an x402 payment endpoint: health, 402 handshake, price, proceed/caution/avoid.

Scan any public site for AI-agent visibility; get scored findings, a machine-readable fix pack, and

Public MCP digital twin with synthetic systems and an agent firewall. No customer data.

Query 90 days of honeypot probe data: IP reputation, scanners, CVE probing, TLS/SSH fingerprints.

Promotion gate for AI agents: leakage audits, exact-statistics verdicts, and a live report card.

Validate whether an IP address belongs to PetalBot. Remote MCP server exposing a validate_ip tool.

Prove a real, unique human performed an action; mint a signed, verifiable Proof-of-Human credential.

Hosted endpoint for patch-tuesday-mcp: query Microsoft Patch Tuesday security updates (MSRC) with EPSS and CISA KEV enrichment. Free, no auth or API keys.

Search a directory of SOC 2 audit and compliance firms; read GRC migration guides. Read-only.

Validate whether an IP address belongs to YandexBot. Remote MCP server exposing a validate_ip tool.