"Examples of MCPs (Microservices Communication Protocols) That Do Not Require API Keys" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
Generate synthetic random user data for testing, demos, and development without using real persona.
Design quality gate for AI-generated UI: score any URL on 45 deterministic checks, A–F grade.
Verify before the agent pays. Screwtape is an independent check on agent work before a payment goes out: invoices, duplicate invoices and reconciliation, with a signed receipt for your auditor. It is independent of your agent's own model and vendor, with no stake in your agent passing. - judge: pass, fail or retry verdict on one agent output, with a score, reasons and a next_step. Optional deterministic checks: required fields, types, formats, sums, regex. - check_duplicate_invoice (/v1/duplicate): opt-in duplicate-invoice check using keyed fingerprints. - consensus: scores agreement across 2 to 16 agent answers and flags false consensus. - Advisory mode: recommends approve, review or return; a person decides. - Receipts: Ed25519-signed. The receipt proves what was checked, when, and the verdict. Verify via POST /v1/receipts/verify or offline; export via GET /v1/receipts/export. - Judged content isn't stored unless you opt in. Free key: 100 calls/day. Or $0.005 USDC per call via x402 on Base or Solana, no key needed. MCP: https://screwtape.ai/mcp Docs: https://screwtape.ai/docs/ Icon: https://screwtape.ai/icon-512.png Tags: verification, evaluation, llm-as-judge, invoices, receipts, x402
12 free MCP tools for local validation of emails, URLs, IP addresses, IBANs, dates, UUIDs, JSON and other structured inputs. No API key or external verification service required.
Risk-scan a diff, flag AI-generated-code tells, find secrets. 5 of 7 tools need no account.
Test inboxes for your app's sign-up and login emails: get the code or link, or why none came.
Test a web app in a real browser from plain English. Passed, failed or cannot verify, with evidence.
Load testing and synthetic monitoring platform: test with Playwright, Browser Bot, or Protocol Bots.
Fact-check LLM outputs with cited sources. API key: aihcc.cloud/keys.
Ensemble testing of web pages for accessibility, usability, and web standards
Web animation accessibility MCP: GSAP, static CSS checks, prefers-reduced-motion, WCAG 2.2.2/2.3.3.
Your agent verifies its change before commit; PR review that knows what depends on your change.
Free AI visibility check: can AI crawlers read a site, and do ChatGPT, Gemini, Perplexity cite it?
HefestoAI checks AI-generated code before you ship it.
Benchmark your own prompt on 100+ models with real API calls, then choose the winner by accuracy, cost, speed, or any mix of those.
Authorized security scans, evidence, fix prompts and retests for AI-built web apps.
Security scans for AI-built web apps, starting with Lovable. Verify ownership, run authorized scans, inspect findings, get AI-ready fix prompts and request retests. Uses OAuth with a Guarita account. Fix prompt access follows the account plan.
Independent schema and rule check of AI agent output before you pay. Signed attestation and receipt.
Assign Linear, Jira or GitHub issues to an AI coding agent team that plans, builds, reviews, tests.
Pre-launch website QA: deterministic rule-based scans, readiness score, and blockers for agents.
