"Web search tools and methods that don't require API keys" matching MCP connectors:

Federated search of books and papers, BibTeX/RIS citations, open-access retrieval and reading.

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

AI visibility tracking & website fixes for better AI search presence

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

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

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

Measured share of answer for 24 crypto and Web3 brands. An open dataset, not an audit of your site.

CLSTR reads 100,000+ articles a day from 40,000+ sources in 170+ countries and deduplicates them into single events, then links related events into ongoing situations with a maintained summary and a full timeline. An agent can answer what has happened over the last six weeks, not just what a single headline says right now.

Company intelligence via UK Companies House and risk screening across 386 risk data sources.

Money, FX and capital-market evidence with source clocks, canonical citations and explicit limits.

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

Structured habitat data and advisory tools for aquariums, marine tanks, terrariums and paludariums.

Millions of dated buying and momentum signals: who raised, who's hiring, what changed and when

Official MCP: continuous supply-chain risk monitoring and early warning, not a one-off report. Register and create a key at https://supplygraph.ai/zk_chat_os/dashboard/dashboard.html — if you are not signed in you will be redirected to login; new users can register there. After login, open A2A / MCP and click Create Production Key or Create Sandbox Key. Send the header as Bearer <api_key> (one Bearer prefix, then the raw key). Optional for initialize and tools/list; required for tools/call.

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

Helena Bioinformatics MCP for clinical variant interpretation, ACMG/AMP evidence and literature.

Connect Claude or any MCP client to Thread Otter, a GTM agent for founders. Free tools with no key: find_buyer_threads (give it a website URL and get recent Reddit threads where that product's buyers are asking for it, report in ~3 minutes), reddit_demand_board (weekly demand across 40 communities with thread receipts), and subreddit_rules (promotion posture for 2,000+ profiled subreddits). With an API key: read your buying-intent mentions across Reddit, X, LinkedIn, and Bluesky, check your pipeline, and propose posts and reply drafts in your voice. Propose-only by design: nothing sends without your approval flow. Keys at threadotter.com/connect.

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

Check how much real depth Armasourcing's vetted Filipino virtual assistant pool has for a specific role, skills and timezone, and understand how hiring and engagement work. Returns aggregate pool statistics only, no candidate names, no profiles, and no pricing, and ends in a free discovery call booking.

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