"Web search services that don't require an API key" matching MCP connectors:

aipricepatternsB

com.aipricepatterns

Historical market memory for AI agents using semantic vector search across years of financial market data. Discover similar market regimes, price patterns, and market context for quantitative research and algorithmic trading.

Penfield MemoryAOAuth

io.github.penfieldlabs

Persistent memory and knowledge graphs for AI agents. Hybrid search, context checkpoints, and more.

Semantic nearest-neighbour search over your datasets, plus indices and projections.

Stateless NMI + cosine fusion with entropy-driven alpha calibration

Search and read Vector Panda docs: API operations, pricing, storage tiers, measured benchmarks.

Cloudflare Workers MCP server: embedding-search

Disposable private vector search + semantic RAG for AI agents. x402 pay-per-call, no account.

NeuroStack

io.github.raphasouthall

Token-efficient MCP memory for Markdown vaults. Tiered search, GraphRAG, AI memories.

Astra DB tools for agents: schema, find, vector search, guarded writes, and interactive views.

SearchStackAOAuth

dev.searchstack

Agent-driven search: build, import, tune, search, and score result quality — all over MCP.

Operate your Vector Panda collections: search and upsert vectors, schema, measured indexes, exports.

Xata MCP server lets AI agents interact with your Xata projects, and Postgres database branches.

Vector RAG store for Word/Excel/PDF/PowerPoint. Break-even pricing, $5 per 5,700 pages.

Persistent memory and vector search for AI agents. Hosted, OAuth-protected via Google sign-in.

Persistent memory and knowledge graph for AI assistants — keyword + vector + graph search.