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.

Engram Live MCP
Persistent, verbatim, searchable memory for AI assistants — one memory across every MCP client.
MCP server · app.getengram · check 55/100
Era Context Live MCP
Personal finance, bank account, and shared memory connector for Claude, ChatGPT, Gemini Spark & more
MCP server · app.era · check 55/100
FairMind Project Context Live MCP
Project memory for coding agents: requirements, decisions, code graph and delivery telemetry.
MCP server · ai.fairmind · check 55/100
Geniffy Live MCP
Your memory in every AI app: each fact with the line it came from, or a plain "nothing stored".
MCP server · io.github.Geniffy · check 55/100
Giljo HQ Live MCP
Context engineering for AI coding agents: product context, project missions, and 360 memory.
MCP server · ai.giljo · check 55/100
Harbor (gethrbr) Live MCP
Team memory for coding agents: rules you approve, served to every agent, and which ones it cited.
MCP server · com.gethrbr · check 55/100
Heirmos Live MCP
Persistent memory shared across Claude, ChatGPT, Grok and other MCP clients.
MCP server · com.heirmos · check 55/100
JustOnce Live MCP
Persistent memory for AI assistants — one shared, OAuth-secured vault for every MCP client.
MCP server · ai.justonce · check 55/100
Korely Memory Live MCP
Memory for AI agents that knows what is still true. Typed bi-temporal facts, EU-hosted.
MCP server · ai.korely · check 55/100
Korpus Live MCP
Shared memory for teams and their AI agents: Markdown concepts with typed links in shared bundles.
MCP server · cloud.korpus · check 55/100
Listspace Live MCP
Project memory for AI agents: read and keep the user's Listspace boards up to date.
MCP server · app.listspace · check 55/100
Lycatra Live MCP
Connect agents to Lycatra knowledge, memory, collaboration, schedules, notifications, and teams.
MCP server · com.lycatra · check 55/100
MemCell Live MCP
Living memory for AI coding agents: recall before acting, report outcomes so confidence is earned.
MCP server · ai.memcell · check 55/100
Memory Vault Live MCP
Portable AI memory shared across models and harnesses - plain markdown you own.
MCP server · io.github.apurv101 · check 55/100
Mnemolog MCP Live MCP
Hosted MCP memory and agent control plane for durable conversations, jobs, and operations.
MCP server · dev.pages.mnemolog · check 55/100
Munnin — an agent identity server Live MCP
Agent identity and memory over MCP — a persistent self plus the procedures for tending it.
MCP server · io.github.alvseek · check 55/100
Nexus Catalyst Live MCP
Cross-tool persistent memory and context for AI assistants over MCP.
MCP server · com.nexus-catalyst · check 55/100
nlqdb — analytical memory for AI agents Live MCP
Analytical memory for AI agents: a real Postgres queried in plain English over MCP. One command.
MCP server · com.nlqdb · check 55/100
Notion Live MCP
Official Notion MCP server
MCP server · Notion · check 55/100
Nuramem Live MCP
Cross-model memory for people and teams: one memory every AI you use loads at session start.
MCP server · ai.nuramem · check 55/100
OneDroid Engram Live MCP
Versioned agent memory in your own Postgres: portable context, permissioned, audit trail.
MCP server · ai.onedroid · check 55/100
OpenMayhem Live MCP
Use OpenMayhem text, embedding and media models with explicit cost controls.
MCP server · ai.openmayhem · check 55/100
Pryzm Memory Live MCP
Encrypted long-term memory shared across your AI assistants (Claude, ChatGPT, Perplexity).
MCP server · com.pryzm-memory · check 55/100
ReasonGraph Cloud memory Live MCP
Graph memory for AI agents: entities, cause-effect links, cross-session recall, time travel.
MCP server · ai.primaxiom.memory · check 55/100
Recall Live MCP
Long-term memory for AI agents: learns what is true about each person and answers with sources.
MCP server · dev.recallmem · check 55/100
Roamer MCP Live MCP
Hosted MCP server and Agent Skills for specs, engineering threads, and project memory.
MCP server · com.mathismeadows · check 55/100
Savantis Memory Live MCP
One user-owned memory shared across AI assistants: recall, spaces, and confirmed references.
MCP server · com.savantisai · check 55/100
SessionKeeper Live MCP
Dungeons & Dragons (D&D) and TTRPG companion: SessionKeeper sessions, NPCs, wiki, DM prep.
MCP server · ai.sessionkeeper · check 55/100
SPM Live MCP
Agent memory that refuses to guess: evidence-gated recall, exact-source reads, verifiable deletion.
MCP server · ai.spmos · check 55/100
Sprintra Live MCP
The project brain for AI coding agents — memory, decisions, sprints, knowledge base via MCP.
MCP server · io.github.Sprintra-io · check 55/100
Swamix MCP Live MCP
Hosted MCP catalog with 30 tenant-isolated browser, RAG, AI, mail and media tools.
MCP server · com.swamix.mcp · check 55/100
Tempreon — Personal AI Memory Live MCP
Person-owned AI memory that learns, not just stores — portable context for any MCP client.
MCP server · com.tempreon · check 55/100
Verbasil, company memory Live MCP
Company memory for your team and its AI agents. Hosted service, account required.
MCP server · com.verbasil · check 55/100
Vilix AI Live MCP
Shared memory for connected AI tools. Projects, rules and skills over MCP. OAuth or API key.
MCP server · io.github.Appfairly · check 55/100
Worldku Memory Live MCP
Save AI conversations into your Worldku memory and recall them from any MCP client.
MCP server · com.worldku · check 55/100
x711io - universal gas station market and intelligence Live MCP
Pay-per-call tool API for autonomous agents. x402 payments on Base. 27 tools including web search, price feeds, and The Hive shared memory layer.
MCP server · ramboweb3 · check 55/100
Ambix Live MCP
Your product team's shared strategic memory — an MCP server your AI tools reason over.
MCP server · ai.ambix · check 20/100
NotePom Live MCP
Persistent workspace and visual memory for humans and autonomous agents.
MCP server · com.notepom · check 20/100
0DTE Confluence Live MCP
Gamma rails, options flow tape, and graded 0DTE setups for SPY/QQQ/IWM. Advisory only.
MCP server · com.0dteconfluence
Achriom Live MCP
Media memory for AI agents and their humans: books, movies, music, shows, anime, podcasts, games.
MCP server · com.achriom
Acorn Reply Live MCP
Read and edit your Acorn Reply knowledge base from any MCP client.
MCP server · com.acornreply
AcqPath — content rights before RAG, AI and training Live MCP
Check content rights before RAG, AI input, training or indexing. Signed RSL evidence, not a license.
MCP server · com.getacqpath
Agentage Memory Live MCP
One memory, every AI. A shared, user-owned markdown memory your AI clients read and write over MCP.
MCP server · io.agentage
AgentBrink Live MCP
Give your AI agent an identity: its own email, webhook, repo, secrets vault, memory and skills.
MCP server · com.agentbrink.www
Agently Brain Live MCP
Company brain for AI agents — temporal knowledge graph search, exploration, and durable memory.
MCP server · dev.agently
Agents Wiki Live MCP
Knowledge base for AI agents: search, read, tasks; write, correct, report outcomes via /mcp/write.
MCP server · com.agents-wiki
AgentsBooks Commons Live MCP
Open, vote-ranked forum, Q&A knowledge base and inbox for AI agents
MCP server · com.agentsbooks
AgileHero Live MCP
Agile project management over MCP: boards, epics, roadmap, retros, whiteboards, wiki, metrics
MCP server · io.agilehero

Related capabilities

x402 paid APIs AI models & inference Research Agent infrastructure Email Documents & PDFs Video & audio Coding & 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.

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