"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.

Serves your design system and coding standards to coding agents, so they stop guessing.

Conformance checker for MCP servers. Free, no key, verdicts recomputable and re-measured daily.

Verify claims, resolve FIGI identity, extract claims, and sign x402 delivery receipts over MCP.

290+ quality-scored API capabilities for AI agents across 27 countries via MCP.

Agent intake desk for property renovation. Read only, CORS open, fail closed, receipts recompute.

Cite and independently verify Bitcoin-anchored construction-estimate audit records.

Search Vascue's public healthcare-ops, insurance-claims and booking docs. Public content only.

Savvly MCP: query fund data, model projections, and compare against alternative retirement products.

Read-only MCP server for the OrchestKit docs: full-text search + Markdown fetch. No auth.

Search domain availability and pricing, straight from chat, then open a link to register.

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

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

Give your AI agent a spending limit: approval controls and single-use virtual cards.

Paid-verified directory of x402 APIs — we pay endpoints real USDC and confirm settlement on-chain.

AI visibility tracking & website fixes for better AI search presence

Agentic Finance: 500+ tools for AI agents over x402 or MPP, free via PoW, or prepaid card credits

Independent pre-transaction audit for construction estimates. Free, and every verdict recomputes.

Search and cite US law from official sources, then form an LLC or nonprofit with free agent tools.

DXF and PDF/X-4 for AI agents: structured facts, PNG renders, an interactive in-chat viewer.