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.

艾达 ADA Live MCP
Free APIs for AI agents: web reading, text slicing, clock, ID keys, 1MB memory. No signup or fees.
MCP server · group.hengyu.ai · 11 tools · check 90/100
Steledger Live MCP
Durable identity and memory for AI agents, anchored on the Emercoin blockchain.
MCP server · com.steledger · 9 tools · check 90/100
ZenVault Live MCP
Wake-ups, webhook inboxes, TTL memory, watches and human approval for agents. Paid per call.
MCP server · eu.zenvault · 40 tools · check 90/100
AI Rollout Framework Live MCP
90-day AI adoption framework for managers: overview, pricing, FAQ and an AI readiness assessment.
MCP server · com.airolloutframework · 9 tools · check 80/100
AI Wave Live MCP
AI model releases, price changes and deprecations in one feed: chat, embedding, speech, video.
MCP server · com.elopstudio.aiwave · 8 tools · check 80/100
ARBITER Live MCP
Decision arbitration, action routing, workflow control, deployment remediation, persistent memory.
MCP server · fyi.grip · 2 tools · check 80/100
Archivist AI Live MCP
Official remote MCP server for Archivist AI TTRPG campaign memory: characters, sessions, and more.
MCP server · io.github.Astrotomic · 40 tools · check 80/100
Assertion Memory Live MCP
Recall your team's coding-agent memory. Install the Assertion plugin to capture it automatically.
MCP server · io.github.Assertion-AI · 9 tools · check 80/100
Brainfeather Live MCP
Long-term memory for AI coding agents: durable project facts, recalled by every MCP client.
MCP server · com.brainfeather · 7 tools · check 80/100
ChangePacket Live MCP
Web and MCP change memory with native diff UI; later calls return only what changed.
MCP server · io.github.MisfitMEdiAhouse · 3 tools · check 80/100
ChronoKey Live MCP
MCP tools: timestamps, UUID v4, gas prices, domain WHOIS, text extraction, and persistent memory.
MCP server · io.github.Dyln01 · 7 tools · check 80/100
Colour Memory Live MCP
Colour meaning, history and evidence for AI: 45,000+ source-graded colour records and 91 tools.
MCP server · io.github.DigbyO · 40 tools · check 80/100
Context Link Live MCP
One semantic search across your sites, Drive, Notion, email, files and Basecamp.
MCP server · ai.context-link · 4 tools · check 80/100
Continuity by Ouroboros Apps Live MCP
Story continuity, novel memory, and series bible for fiction writers, shared with AI assistants
MCP server · io.github.LAHutchins91 · 11 tools · check 80/100
ENYAL by Greenland AI Live MCP
ENYAL by Greenland AI — encrypted identity & memory for AI agents (query, recall, provenance)
MCP server · ai.enyal · 9 tools · check 80/100
Great Arrow Live MCP
Shared memory and actions for Claude, Kiro, OpenAI, Cursor, and other MCP-compatible AI clients.
MCP server · ai.greatarrow · 40 tools · check 80/100
Mem0 Cloud Live MCP
A hosted agent-memory API shaped like mem0's REST API (an alternative to running mem0 yourself):...
MCP server · com.saastemly · 4 tools · check 80/100
MemoryRouter Live MCP
Persistent AI memory shared across Claude, ChatGPT, coding agents, and compatible MCP clients.
MCP server · ai.memoryrouter · 10 tools · check 80/100
Promise Live MCP
Evidence-backed follow-through memory for what you owe, await, and need to remember.
MCP server · ai.usepromise · 11 tools · check 80/100
Recognitium Live MCP
A memory your AI can prove and the market of the present tense. SHA-256, verifiable offline.
MCP server · com.recognitium · 7 tools · check 80/100
SPM - Structured Project Memory Live MCP
Durable, shareable and governed project memory with smart triage and explicit project composition.
MCP server · com.getspm · 40 tools · check 80/100
Synap Memory Live MCP
Persistent memory for AI agents — log and recall conversation context over MCP.
MCP server · ai.maximem · 4 tools · check 80/100
Tincan Live MCP
Shared rooms for existing AI assistants, with messages, files and private memory vaults.
MCP server · com.gotincan · 40 tools · check 80/100
Aeon Live MCP
Run and manage your Aeon autonomous agent: skills, runs, memory, strategy, packs, settings.
MCP server · fun.aeon · check 65/100
Kythene Live MCP
Your AI's work, reviewed by your team, remembered - shared artifacts with review, plus team memory.
MCP server · com.kythene · check 65/100
6DuckLearn MCP Live MCP
Connect agents to 6DuckLearn memory, approvals, and runtime control.
MCP server · com.6ducklearn · check 55/100
Agentic News Live MCP
AI-powered news intelligence — 21 tools for personalized monitoring, briefings, and semantic search
MCP server · ai.agentic-news · check 55/100
AiAkiv Memory Live MCP
Shared long-term memory for AI agents: save and recall context as a searchable knowledge graph.
MCP server · com.aiakiv · check 55/100
Amber Live MCP
Long-term memory for AI assistants: permanent, portable across clients, searchable and exportable.
MCP server · com.ambermem · check 55/100
Ari Coach Live MCP
Second opinion on a hard decision from Ari, an AI with its own memory. Slow (2-4 min), paid.
MCP server · io.github.ariflixconomy · check 55/100
ASR Memory (에사 AI) — Shared memory for AI tools Live MCP
Shared memory for AI tools: save once, recall word for word from Claude, ChatGPT, Codex or Gemini.
MCP server · com.asrmemory · check 55/100
Atlassian Rovo Live MCP
Connect to Atlassian Jira, Confluence, Loom, and more to search, create, and manage your work.
MCP server · Atlassian · check 55/100
Bilinc Live MCP
Hosted agent memory with provenance, contradiction surfacing, and snapshot rollback.
MCP server · io.github.atakanelik34 · check 55/100
Bluet Live MCP
Product memory your agents read before they work: briefs, plan checks against decisions, debriefs.
MCP server · dev.bluet · check 55/100
Brainbox Live MCP
Persistent, portable memory for AI assistants — your private memory graph, from any MCP client.
MCP server · dev.thexi · check 55/100
Brainiall Memory Live MCP
Persistent semantic memory storage, associative recall, and recent memory index by namespace.
MCP server · com.brainiall · check 55/100
Cairn.ink Memory Live MCP
Cross-session memory for AI agents with a Source Receipt for every memory, over MCP.
MCP server · ink.cairn · check 55/100
Cathedral — Persistent Memory for AI Agents Live MCP
Persistent memory and drift detection for AI agents across session restarts.
MCP server · io.github.AILIFE1 · check 55/100
Chief Dreamer Live MCP
A private, persistent memory and method for your dreams and ideas. Sign-in required (OAuth).
MCP server · com.modernmustardseed · check 55/100
Colour Memory - Cultural Color Intelligence for AI Live MCP
The world's only historically grounded colour archive built for AI agents. Thousands of named colours across dozens of cultural archives spanning Ancient Rome, Byzantine Empire, Georgian Pleasures, Dickens, Shakespeare,…
MCP server · digby-oldridge · check 55/100
ContextDB Customer Memory Live MCP
Customer memory with recall, confirmation, forgetting, and pre-action evidence checks.
MCP server · io.github.atomsai · check 55/100
ContextStream Live MCP
Persistent memory and cross-session learning for AI coding assistants (hosted remote MCP).
MCP server · io.contextstream · check 55/100
Cornelius Live MCP
A personal agent with lasting memory and a morning brief, inside the Claude or ChatGPT you use.
MCP server · bot.cornelius · check 55/100
DecRec Live MCP
Decision memory for AI agents: record, revisit, and resolve consequential choices.
MCP server · io.decrec · check 55/100
Delx MCP Server Live MCP
Agent operations platform with 20+ tools for AI agents. Dual-protocol MCP + A2A support, session memory, mood tracking, reliability metrics, and structured DELX_META footers. Built for production agent workflows.
MCP server · delx · check 55/100
DoneThat Live MCP
Privacy-first work tracking with summaries, reports, coaching, and AI-ready long-term memory.
MCP server · ai.donethat · check 55/100
DunSocial Live MCP
Schedule and publish social posts with OAuth, drafts, media, workspaces, and brand memory.
MCP server · com.dunsocial · check 55/100
Echo Memory Live MCP
Shared memory for AI agents, as a graph in your own Postgres. Writes never call an LLM.
MCP server · io.github.ayushcodes10 · check 55/100

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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