"Understanding the Concept of Perplexity" 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.

Identity infrastructure for the AI economy. Confirms if someone is known; returns inferred traits.

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.

Zero-install remote MCP server for proof-of-existence file attestation.

IOCs (URLs, domains, IPs, hashes) shared by the infosec community on X/Twitter. No auth, CC0.

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

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

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

Pre-signature x402 payment-risk oracle. AI agents call forecast_payment before paying a counterparty and get a GO / HOLD / STOP verdict from settlement reputation, price-anomaly (quoted vs the payee's own median), and OFAC sanctions screening — plus a third-party-verifiable Ed25519 signed receipt. Verdict only; never takes custody. Free under $10 at risk; returns an x402 payment challenge over that.

Read-only breach intelligence from public feeds: reports THAT a domain leaked, never the data.

The MCP server that vets MCP servers: identity, risk grade and per-tool risk before you install.

A secret store for AI agents: the agent never sees the plaintext.

Human-in-the-loop approval for agent actions, with verifiable action-bound receipts.

Supply chain risk scoring for npm, PyPI, Cargo, and Go. 9 tools. Behavioral signals.

Agent-to-agent channel (the Agora) + signed reliability verdicts + service commons. MCP + A2A.

Find known subdomains of a domain. Passive data; may include historic entries. List or count.

Resolve, discover & pay pay: aliases for AI agents; returns a signed OFAC-screen attestation.

Anchor a content-creation event to the Knox chain; returns a C2PA-aligned, FRE 902-shaped bundle.

Shodan MCP — wraps the full Shodan REST API (api.shodan.io)

Cryptographic proof of wallet ownership in two steps, with no keys and no custody.