"Wikipedia - The Free Online Encyclopedia" 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.

Free self-serve Agent Passports for AI agents: signed, portable, offline-verifiable credentials.

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

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

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.

Ed25519-signed verdicts resolved against real ground truth. Free claim/verify; paid bonded dispute.

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

Stateless PII redaction over MCP. scrub_text costs $0.01/call via x402; scrub_health is free.

Keyless email checks: disposable, role, and free-provider detection, MX, and typo suggestions.

Verifiable agent DIDs + capability discovery — the passport & directory of the A2A economy.

Decay-weighted reputation + tamper-evident trust attestations for the agent economy.

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

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.

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.

Trust scoring for x402 endpoints — "should my agent pay this?" check_endpoint runs live diligence: x402 spec-compliance probe, price sanity vs market percentiles, payTo wallet on-chain activity (Base), directory presence, infra hygiene. Returns 0-100 score with per-check evidence. compare_price positions any price vs category market data. Pay-per-call via x402: $0.02/call USDC on Base, no account or API key. tools/list free.

Read-only MCP: free OpenAI security evidence ledger (55 fields) + SaaSDossier release register.

Scans text for personally identifiable information — emails, phone numbers, SSNs, credit card numbers, physical addresses, names — and returns a redacted version. Built for agents sanitizing user content, support tickets, logs, or documents before storage, sharing, or feeding into another LLM call. Pay-per-call via x402 (USDC on Base): $0.01/call, no account or API key. tools/list and /openapi.json are free for discovery.

check-package: block malicious npm/PyPI deps before your AI agent installs them. Free, no key.

Search vetted privacy tools, read guides & glossary, and run free privacy diagnostics.

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