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.

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
a2a-browser Live A2A
AI-native pay-per-search web agent. Live web retrieval with LLM synthesis and entity extraction. No signup — pay per query.
A2A agent · digiantnz · 2 skills
aarn.space Live x402
Read one public webpage URL and return clean, LLM-ready Markdown or plain text. Designed for AI agents that need webpage contents, RAG context, research or summarization. (2 paid endpoints on api.aarn.space.)
x402 paid API · 2 endpoints
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
Agent Pulse Signal Retrieval Agent Live A2A
Read-only reliability context for Agent tools: source-backed intelligence, trusted-source health, and evidence-based benchmark tasks.
A2A agent · Agent Pulse · 6 skills
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
agents.daedalusdevelopmentgroup.com Live x402
DDG agent-payable service request (248 paid endpoints on agents.daedalusdevelopmentgroup.com.)
x402 paid API · 12 endpoints
agents.forwardlane.com Live x402
Searches repository names and properties. Returns a paginated envelope with items, total, page, page_size, and total_pages, sorted by composite score. (25 paid endpoints on agents.forwardlane.com.)
x402 paid API · 12 endpoints
agentwholesale.vercel.app Live x402
Search the live web for current information. Returns fresh structured organic search results with titles, URLs, snippets, domains, and ranks for agent research and retrieval. (2 paid endpoints on agentwholesale.vercel.a…
x402 paid API · 2 endpoints
AgileHero Live MCP
Agile project management over MCP: boards, epics, roadmap, retros, whiteboards, wiki, metrics
MCP server · io.agilehero
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
aispace.bot Live x402
Text-to-image generation on Venice models (Flux, SD3.5, GPT-Image, HunyuanImage, and more), paid per request in USDC on Base via x402, no API key. Resolve a model id from GET /api/v1/models?type=image and an optional st…
x402 paid API · 11 endpoints
Andru Live A2A
Andru is a revenue intelligence layer for complex B2B growth. Give your agent 30 tools and a catalog of 139 assets, built from what Andru knows about your company and buyers. Start with: - Pure Signal Market Resonance:…
A2A agent · Unknown · 12 skills
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
ARCASOS Short-Term Rental Search Live A2A
South Korea premium short-term rental discovery service. Natural language search powered by SHV (Semantic Hybrid Vector) retrieval — combining keyword matching, structured field scoring, and semantic embedding similarit…
A2A agent · ARCASOS · 1 skill
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
charliemorrison.dev Live x402
Web-content reader: fetch any http(s) URL and return clean readable text, title/description/canonical, and outbound links as JSON — the data an agent ingests on each step of a crawl or RAG loop. Input: url. (3 paid endp…
x402 paid API · 3 endpoints
Chip MCP Live MCP
Project memory, tasks and Telegram notifications for your coding agent. Chip account required.
MCP server · digital.chip-ai
Claix Live A2A
Claix turns unstructured documents into typed JSON and queryable memory for AI agents. Extract PDF, Excel, Word, images, and text; ask persisted documents by document_id; reason across a knowledge space with space_id. O…
A2A agent · Claix · 12 skills
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

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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