"Examples of MCPs (Microservices Communication Protocols) That Do Not Require API Keys" matching MCP connectors:

Read-only breach intel, full history 2007-today: reports THAT an org was breached, never the data.

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

Neutral fairness computation for agents: two or more parties submit sealed inputs, a published deterministic algorithm runs (fair division, verifiable random selection, Shapley shares), and every party receives an identical signed certificate anyone can re-run and verify for free.

Verify anything: email, phone, domain, URL and IBAN validation, phishing/malware URL screening, and OFAC sanctions checks. Pay-per-check in USDC on Base via x402 — no signup, no API keys.

Scan public websites for privacy, cookie, tracker, consent, policy, and disclosure risk signals. Start instantly with zero-auth Light mode—no account or API key required.

Runtime permission, approval, and audit layer for AI agent tool execution.

Confirms an AI agent/service is who it claims to be (domain + agent-card + MCP handshake).

Anomaly detection API powered by physics simulation. Scan any data for outliers.

Trusgent MCP — Trust Layer for AI agents. HK registry + Agent Cards. Default: get_merged_profile.

Read AFMR failure modes and discover scoped attestation and lift-evidence contracts.

Audit MCP configs and skill files for over-broad scope and injection risk. 6 of 8 free.

Email posture for any domain: can it receive mail, can it be spoofed? MX, SPF and DMARC.

Twelve tools: token, wallet, contract and site security. Two free, the rest $1 in USDC over x402.

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.

DNS and email security: check SPF, DKIM, DMARC, DNSSEC, DANE and build the records. 45 tools.

Search newly registered, expired, aged, active, deleted and for-sale domains, plus WHOIS and DNS.

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

Verify VerixID proof-of-existence records and optionally prove ownership.

Capture a web source, or seal a hash you hold, into a signed receipt anyone can verify offline.

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