"Services or tools that don't require a separate API key" matching MCP connectors:

Win probabilities for 13 sports: NFL, NBA, soccer, tennis, golf, cricket. No API key, no signup.

Polymarket, Manifold, Metaculus compared: one fair probability per question. No API key needed.

Australian AI governance framework mapped to the Privacy Act and sector laws your AI use triggers.

Reference data for prediction markets: graded resolution clarity, cross-venue links, provenance.

The Brain Layer for AI Trading Agents — quant calls + cross-venue arb across perp venues via MCP.

US funding-stress warning with construction-PIT evidence limits and explicit eligibility flags.

Diagnoses, drugs & lab codes: ICD-11, SNOMED, LOINC, RxNorm, MeSH, ATC, CID-10. 37 tools, MIT.

Read-only MVR preflight for trust, permission, evidence gaps, and African market-entry readiness.

Bank and lender monitoring with historical-evidence limits and eligibility flags beside every claim.

Open AI Visibility Index for crypto and Web3. Weekly share-of-answer measurements for 24 tracked brands across ChatGPT, Perplexity and Gemini, from a frozen versioned prompt panel. Five read-only tools: full index, per-brand lookup, brand list, complete measurement history and methodology. No auth, no API key. Data is CC BY 4.0 with a permanent archive of every weekly snapshot, so any figure can be verified independently.

Open AI Visibility Index for SaaS and AI tools. Weekly share-of-answer measurements for 20 tracked brands across ChatGPT, Perplexity and Gemini, from a frozen versioned prompt panel. Five read-only tools: full index, per-brand lookup, brand list, complete measurement history and methodology. No auth, no API key. Data is CC BY 4.0 with a permanent archive of every weekly snapshot, so any figure can be verified independently.

Reviewed competitor pricing, offer comparisons, and market-change evidence with x402 payments.

AMZScout Skill + MCP gives AI agents live access to real Amazon marketplace data across 14 Amazon marketplaces. Analyze any ASIN, validate product ideas, research niches, compare competitors, discover profitable keywords, and build data-driven PPC strategies using trusted Amazon insights instead of AI assumptions. Works with Claude, ChatGPT, Cursor, and any other MCP-compatible AI client. To connect, you'll need an AMZScout API plan and authorize your account. Get access and view pricing here: https://learn.amzscout.net/amazon-product-api-for-ai-agents

Taiwan stock market data (TWMD): official-source, point-in-time-safe datasets via read-only tools.

Structured iGaming reference: slot specs & RTP variants, providers, regulators, news and jobs.

Moderated usability testing: read sessions, notes, transcripts, reports, and draft test scenarios.

Free AI-industry intelligence for agents: briefings, regulation tracker & regional lenses

Real-time electricity prices for AI agents. 40+ countries, 100+ zones. No auth required.

An MCP server that gives any LLM or agent clean YouTube transcripts on demand: a single video, a whole channel, or a playlist, plus AI cleanup of auto-generated captions. API-key auth, credit-based, same backend as the public v1 API. Get a free API key with 25 free credits at youtubetranscriptdownload.com/account.

No-key MCP: audit/certify MCPs, signed trust history; join Gold Rush Town & build with your LLM.