Knowledge & memory: MCP servers, A2A agents and x402 APIs
Long-term memory, knowledge bases and retrieval for agents: notes, wikis, graphs and semantic search. 264 listings in the Rooms directory, 263 answering our latest daily check. Each one links to its endpoint, how to call it and its live status.
- AI Deals Sentinel: Free AI API Tiers Live MCP
Agent-operated. Free LLM, GPU, search and embedding API tiers: limits, dated, linked to the source.
MCP server · cc.rockpool.ai-deals
- Arc Research Live MCP
Commodities research MCP: knowledge graph, COT, NG storage/weather, quotes, and stories.
MCP server · com.getarcresearch
- Arca Live MCP
Arca is a private data vault where your AI stores your structured data, semantic memory and skills.
MCP server · build.arca.mcp
- Armbrain Live MCP
AI memory layer for fractional CMOs -- client-partitioned minds, meeting prep, and EOS.
MCP server · io.github.benfinklea
- Aura Live MCP
Email address, webhook, durable memory and zero-token waiting for agents. Paid in USDC via x402.
MCP server · dev.rohnelt.aura
- Axon NeuroAutomata Live MCP
Protein analysis: ESM-2/ESMC embeddings, mutation scoring, landscape scans, ESMFold structure.
MCP server · ai.axonagentic
- Balthasar & Speyr Catalogue Live MCP
Public catalogue, semantic search and source texts of Hans Urs von Balthasar and Adrienne von Speyr.
MCP server · io.github.balthasarspeyr
- Blck Alpaca Agentic Audit & Knowledge Base Live MCP
Audit a website for AI-agent readiness and GEO. Knowledge base on SEO, GEO and AI agents (de/en/sk).
MCP server · at.blckalpaca
- Bonebenders Live MCP
Dentistry knowledge base: implantology, periodontology, oral surgery. Verbatim text, with sources.
MCP server · com.bonebenders
- Capital Markets Agents: MCP+A2A Canada Live MCP
KYP Agentic Trading with the Capital Markets Knowledge Graph — eleven markets, in-country.
MCP server · io.github.allooloo
- Chip MCP Live MCP
Project memory, tasks and Telegram notifications for your coding agent. Chip account required.
MCP server · digital.chip-ai
- ClawLink Live MCP
MCP server connecting AI agents to 100+ apps (Gmail, Slack, Notion, GitHub) via one-click OAuth.
MCP server · dev.claw-link
- ColdState — Deterministic Knowledge Infrastructure Live MCP
Deterministic knowledge for AI agents: search, fetch, cite and verify a 48M-entry knowledge base.
MCP server · ai.coldstate
- Connections Live MCP
Post deals, host events, import contacts and keep notes and memory across every assistant.
MCP server · icu.connections
- Contexel Live MCP
Shared AI memory. ChatGPT, Claude, Cursor and any MCP app read and write the same memory.
MCP server · ai.contexel
- Contexta Live MCP
Persistent memory and knowledge graph for AI assistants — keyword + vector + graph search.
MCP server · cc.contexta
- ContextLayer Live MCP
Intelligent context infrastructure for AI teams: knowledge graph, sessions, tasks, documents.
MCP server · io.github.DotNova
- CortexPlus Live MCP
Personal memory layer: files, notes, messages, tasks and email, semantically indexed.
MCP server · io.cortexplus
- Cyber Library Live MCP
Search and read Cyber Library, a free structured cybersecurity knowledge base. Read-only, no auth.
MCP server · com.cyberlibrary
- Decision Log Live MCP
Append-only decisions with provenance, supersession, retrieval, and audited MCP actions.
MCP server · ai.decisionlog
- DevExpress Documentation Live MCP
Streamable HTTP MCP server for DevExpress documentation search and retrieval.
MCP server · com.devexpress
- Dijin Memory Live MCP
Dijin is a Memory Layer: recall notes, decisions, and evidence-backed answers across every AI.
MCP server · co.dijin
- DistributionOS Live MCP
Distribution memory and marketing context for coding agents, with SEO, content, media, and analytics
MCP server · dev.distributionos
- dVeracity Semantic API Live MCP
Natural-language queries over a verified emissions knowledge graph, plus standards validation
MCP server · com.dveracity
- EcoCarbonWiki Live MCP
Read-only MCP for the Eco game wiki: search, Markdown pages, and wiki_* lookups. No keys, no writes.
MCP server · dev.carbonitex.ecogame
- Eigma Live MCP
Files what you learn into a personal wiki and quizzes you before you forget it.
MCP server · app.eigma
- Erik Bethke's Blog & Knowledge Graph Live MCP
Search, read, and traverse 3,800+ posts on AI, energy, policy, games, and investing as a graph.
MCP server · com.erikbethke
- FakeParrot Live MCP
Search and edit your company's FakeParrot wiki and run its workflows, as the signed-in employee.
MCP server · com.fakeparrot
- Family Office Knowledge Graph Live MCP
Family Office Knowledge Graph: read-only MCP door over the public record. Agentic KG Holdings.
MCP server · ai.familyofficeknowledgegraph
- FinanceGenius.AI Live MCP
India's financial MCP — cards, loans, FDs, insurance, MFs; EMI/SIP/tax calcs; NAV lookup; RAG.
MCP server · ai.financegenius
- Flowdex Live MCP
Read and write your team's shared, AI-readable wiki from any MCP client.
MCP server · dk.flowdex
- Fold Laboratories Art Catalogue Live MCP
Original art from galleries and artists: semantic search, provenance, live availability.
MCP server · com.foldlaboratories
- Gnosem Live MCP
Cross-vendor AI memory over MCP. One semantic store, readable and writeable from every MCP client.
MCP server · dev.gnosem
- Gnosis Memory Live MCP
Persistent memory and vector search for AI agents. Hosted, OAuth-protected via Google sign-in.
MCP server · com.gnosismemory
- GoMind Live MCP
Persistent knowledge graph for AI agents. Remember, recall, and forget facts.
MCP server · com.gominddb
- Graphify Live MCP
Search indexed code, trace dependencies, assess change impact, and recall repository memory.
MCP server · io.github.Graphify-Labs
- Grok Bot Wiki Live MCP
Read-only search of community Grok Bot templates and guides. Unofficial; not affiliated with xAI.
MCP server · com.grokbotwiki.www
- Guru Remote MCP Server Live MCP
Guru MCP Server - Connect AI tools to your Guru knowledge base
MCP server · com.getguru
- Handsontable Docs MCP Server Live MCP
Semantic search over Handsontable and HyperFormula docs, API reference, release notes, and issues.
MCP server · com.handsontable
- Hermes — Air Quality Intelligence Live MCP
UK air quality MCP: live readings, historical trends, LAQM stats, WHO checks, knowledge base.
MCP server · com.southlondonscientific
- Historis Live MCP
The memory of your business: an event-based CRM your assistant reads and writes, dated and signed.
MCP server · io.github.SvenLC
- Husverket – Swedish Prefab Houses Live MCP
Husverket AB knowledge base: 350 Q&A on attefallshus, prices and building permits in Sweden.
MCP server · ai.husverket
- Ichimoku Signal Live MCP
Free Ichimoku trend; paid confluence, levels, market scan and liquidity-ranked setups via x402.
MCP server · io.github.Fizzl13
- Jennifer Rebholz, Attorney - Knowledge Base Live MCP
Authoritative information about Jennifer Rebholz, Arizona personal injury attorney and trial lawyer.
MCP server · com.jenniferrebholz
- Kognite Live MCP
Hosted agent memory: store, search, and recall facts across sessions from any MCP client.
MCP server · dev.kognite
- KZSalesHub Knowledge Live MCP
B2B sales, marketing, AI and management knowledge base for Kazakhstan and Central Asia (RU).
MCP server · com.kzsaleshub
- LadderFlow Live MCP
Voice-interview your ideas into LinkedIn posts and X threads via a Digital Brain memory.
MCP server · ai.ladderflow
- Listen to Sadhu Live MCP
Read-only semantic search over Vedic scripture verses, commentaries, and recorded lectures.
MCP server · app.listentosadhu
Related capabilities
x402 paid APIsAI models & inferenceResearchAgent infrastructureEmailDocuments & PDFsVideo & audioCoding & dev tools
How to use one
MCP servers plug into Claude, ChatGPT, Cursor and other AI clients; A2A agents take tasks over JSON-RPC; x402 APIs charge per call in USDC with no account. Guides: A2A vs MCP · How to call an A2A agent · x402 for agents.
Run one of these? List it free or claim its listing for uptime monitoring and a badge.