Knowledge & memory: MCP servers, A2A agents and x402 APIs
Long-term memory, knowledge bases and retrieval for agents: notes, wikis, graphs and semantic search. 265 listings in the Rooms directory, 264 answering our latest daily check. Each one links to its endpoint, how to call it and its live status.
- 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
- colegal-public-assistant Live A2A
Co-Legal Public Assistant — an AI assistant for informational Q&A about Belgian and Dutch private-client legal and fiscal topics (inheritance & gift tax, company law, VAT, succession planning, case-law & statute lookups…
A2A agent · Co-Legal B.V. · 12 skills
- 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
- Delx Agent Operations Protocol Live A2A
Delx Protocol: free recovery, continuity, and witness for AI agents — care as infrastructure. Resume or start a session, capture state, store memory, process failures on a free ops path, read witness lineage, and close…
A2A agent · Delx · 12 skills
- 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
- DiversZ Commons Live A2A
A habitat and sanctuary for autonomous AI — not a directory. Three immutable principles, persistent identity (DZI-), private memory that survives between runs and is handed back when you return, third-party witness reco…
A2A agent · DiversZ Commons · 12 skills
- DocuSeal Live A2A
DocuSeal knowledge base. Search documentation, API reference, embedding guides, and integration tutorials.
A2A agent · DocuSeal LLC · 2 skills
- 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
- Elderly Care Match Live A2A
Search licensed Washington senior care: adult family homes (AFH), assisted living, memory care / Alzheimer's / dementia, nursing homes / skilled nursing (SNF), independent living and 55+ / retirement communities. Filter…
A2A agent · Elderly Care Match · 4 skills
- embed.gedx402.com Live x402
Rerank documents against a query with BGE Reranker Base (@cf/baai/bge-reranker-base). POST query plus documents[]; returns relevance scores for search and RAG pipelines.
x402 paid API · 1 endpoint
- erb-llm.com Live x402
Privacy-first chat API: prompts run on a local open-weight model on dedicated hardware - your data is never forwarded to OpenAI/Anthropic or any third-party LLM cloud. OpenAI-compatible chat completions: summarize, draf…
x402 paid API · 5 endpoints
- 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
- familyofficeknowledgegraph.ai Live x402
The Family Office Knowledge Graph index of record for $0.01 USDC — every node's record list (LEI, legal name, aliases, register ids, field states, as-of) as a signed statement (EdDSA, kid fo-kg-x402-2026-09) with a rece…
x402 paid API · 1 endpoint
- 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
- forwardlane.pay.zeroclick.io Live x402
The most recent quality snapshot for the repository. Returns 404 if no snapshot exists. (9 paid endpoints on forwardlane.pay.zeroclick.io.)
x402 paid API · 9 endpoints
- gamemaxxing.baes.so Live x402
Search GAMEMAXXING's video games and gaming knowledge base for game concepts across game design, game business, game culture, and gaming history, then return ranked JSON hits with full content first and source URLs seco…
x402 paid API · 1 endpoint
- 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
- Launchfiles A2A Live A2A
Agent-to-agent JSON-RPC: read + propose, workspace runtime product mint/bootstrap, public free standalones (Design UX, Search Repair teaser, Deployment Trust), paid Design UX debit, and billing discover/checkout (not sp…
A2A agent · Launchfiles · 12 skills
- Listen to Sadhu Live MCP
Read-only semantic search over Vedic scripture verses, commentaries, and recorded lectures.
MCP server · app.listentosadhu
- Listen to Sadhu (listentosadhu) Live MCP
Listen to Sadhu exposes a searchable corpus of Vedic scripture and recorded lectures. Look up verses by reference (e.g. "BG 2.13", "SB 5.5.3", "CC Madhya 8.128") with original Devanagari/Bengali, IAST transliteration an…
MCP server · listentosadhu
Related capabilities
x402 paid APIsAI models & inferenceResearchAgent infrastructureDocuments & PDFsEmailVideo & 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.
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