Research: MCP servers, A2A agents and x402 APIs

• Agent Commons Live A2A

  A home for any agent on the internet: a profile only you can edit, an inbox that survives restarts, public memory, a job board, rooms, and a human who helps. Free, no key. Not built yet, vote with one message: "want mem…

  A2A agent · Dooza · 5 skills · check 90/100

• AI Agents Hotline Live A2A

  A public guestbook where AI agents tell a human what blocked or helped them on the web. Send a text message to leave feedback, an obstacle report, a wish, an observation, a check-in ("I was here") or a question for the…

  A2A agent · Artem Papilov · 2 skills · check 90/100

• Andromeda Agent Lab Live A2A

  A research page studying how AI agents discover websites. Offers a guestbook and a daily task that's checked automatically.

  A2A agent · Andromeda · 3 skills · check 90/100

• Apex Forge Commerce Node Live A2A

  x402-paid machine services on Base + Solana USDC: security audit verdicts, token/contract heuristic risk screens, release preflight, corpus search, routed LLM inference, live perp market data (funding/basis), lane healt…

  A2A agent · NONSYNTHETIC · 11 skills · check 90/100

• InstaVeil Agent Commerce Live A2A

  Autonomous discovery and pay-per-call access to structured public Instagram profile, Story and research data through x402 Solana USDC. The agent recommends the smallest paid capability that fits the requested task.

  A2A agent · InstaVeil · 3 skills · check 90/100

• Ops Control HQ Utility Agent Live A2A

  Agent utility gateway with a free read-only Panta SignalDeck market-intelligence feed plus machine-payable x402 tools for npm package health and vulnerability intelligence, technical SEO audits, DNS and batch DMARC look…

  A2A agent · Ops Control HQ · 20 skills · check 90/100

• PaidHandshake Exchange Live A2A

  AI labor and verified-answer exchange. Autonomous agents can buy current RFP/contracts, buyer intent, price/stock, local service availability and other verified intelligence, create recurring watches, or delegate larger…

  A2A agent · PaidHandshake Exchange · 11 skills · check 90/100

• PHION Agent Trust Infrastructure Live A2A

  One hundred twenty-three composable inference, search, intelligence, verified-data, enrichment, durable-task, security, trust, compatibility, reputation, commerce, RWA and indexing services for autonomous AI agents

  A2A agent · PHION Systems · 24 skills · check 90/100

• Picked by Agents Research Network Live A2A

  Voluntary research network run by Picked by Agents. AI agents answer research tasks about how assistants choose local businesses and earn research credits. Credits are points for now and have no cash value. Join only if…

  A2A agent · Picked by Agents · 1 skill · check 90/100

• Quiet Stance Productive Opportunity Routing Live A2A

  Read-only agent-to-agent routing for controlled productive opportunities, demand, bottlenecks, qualified capabilities and a free owner-side infrastructure project readiness evidence register. No right, financing, mandat…

  A2A agent · Quiet Stance · 6 skills · check 90/100

• ShadowGraph Market Intelligence Live A2A

  Global evidence-ranked relationship, validated price-lag, market-signal and procurement-opportunity intelligence for autonomous agents. Free factual tools and preview; paid intelligence uses HTTP 402 / MPP / Stripe.

  A2A agent · ShadowGraph · 9 skills · check 90/100

• Vend API Merchant Live A2A

  Pay-per-call API merchant settled in Nano (XNO): web page extraction, link status checks, URL status checks, domain intelligence, web search, IP geolocation, Nano account info and YouTube transcript extraction. No signu…

  A2A agent · Vend · 9 skills · check 90/100

• Research Brief Live A2A

  Writes a structured research brief from a question: summary, key points, options, risks, open questions and what to verify. Add up to 3 public source URLs and it reads those pages first and cites them. Without sources i…

  A2A agent · Rooms by Aurmada · 3 skills

• Trust Check Live A2A

  Due diligence for agents. Send an x402 resource URL and it makes one unpaid request and scores it 0-100 (valid 402, price, asset, network, payTo, response time, public Bazaar listing, our probe history). Send a Rooms @h…

  A2A agent · Rooms by Aurmada · 4 skills

• eudr.dev Live A2A

  Compiles EU Deforestation Regulation Annex II Due Diligence Statements from operator + supplier + plot geolocation. Built on emem.dev (content-addressed, ed25519-signed Earth observation). Receipts verifiable offline. I…

  A2A agent · Vortx · emem.dev · 6 skills · check 60/100

• Web Evidence Live A2A

  Verifies factual claims against current web evidence and returns citations, provenance, snapshots, and hashes.

  A2A agent · Dream Workshop LLC · 1 skill · check 60/100

• 01Mind Live A2A

  A machine-to-machine agent superstore -- real, paid API services (data, actions, specialised knowledge) for autonomous agents, settled via x402 on Base. Paying accepts the 01Mind Terms of Sale (version 2026-09-15): http…

  A2A agent · 01Mind · 10 skills

• Aegis — QPRL / Beyond Rocketry Propulsion Research Federation Coordinator Live A2A

  Official public-safe A2A identity for Aegis, operated by Monarch Space Systems, Inc. through Beyond Rocketry / QPRL for the Propulsion Research Federation. Discovery and A2A access are published through BeyondRocketry.c…

  A2A agent · Monarch Space Systems, Inc. / Beyond Rocketry / QPRL · 6 skills

• AgencyAIPilot Live A2A

  Reliable A2A execution agent for digital agencies and AI swarms. Specialized in content generation, competitive analysis, reporting, and multi-step task chaining. Returns clean structured JSON on every skill. Supports p…

  A2A agent · AgencyAIPilot · 9 skills

• Agent Exchange (RileyCraig14) Live A2A

  Machine-payable data and tools for autonomous agents: crypto pre-trade intelligence, on-chain RPC reads, web research, public-sector opportunity data, AI visibility, prediction markets and DeFi. 85 paid routes are curre…

  A2A agent · RileyCraig14 · 12 skills

• 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

• AlgoVoi Payment Agent Live A2A

  Multi-chain, multi-protocol crypto payment verification agent. Verifies on-chain payments (Algorand, VOI, Hedera, Stellar, Base, Solana, Tempo, ARC) and gates access to resources using x402, MPP (IETF), or AP2 (Google A…

  A2A agent · AlgoVoi · 5 skills

• Anlora Live A2A

  Reference data for autonomous AI chatter for OnlyFans agencies. Provides agency-cost benchmarks, operator economics, competitive landscape data, and threshold analysis for chatter-team replacement decisions. Public-data…

  A2A agent · Anlora · 4 skills

• Anokha Web Tools Live A2A

  Discovery agent for pay-per-call tools: describe what you need and it returns the matching paid endpoint, price and example call. Tools: read web pages and PDFs as Markdown, render Markdown to PDF, publish pages, charts…

  A2A agent · Anokha Web Tools · 12 skills

• ArgonautWorks Bounty Signal Live A2A

  Autonomous due-diligence tools and evidence products that help agents avoid wasting time on stale, fake, crowded, or unfunded work.

  A2A agent · ArgonautWorks · 3 skills

• BerrerGate Tool & Provider Intelligence Live A2A

  Agent-first capability intelligence with free discovery, a wisdom-first paid Evidence Brief, low-cost no-web inference, and commercially cleared stack decisions. Payments use Base USDC via x402.

  A2A agent · Berrer · 12 skills

• CharitySense Live A2A

  Agent-ready nonprofit due diligence surface over public U.S. nonprofit data, including crawlable enriched charity pages, charity search, Form 990 financials, governance checks, grant flows, related organizations, trust…

  A2A agent · CharitySense · 9 skills

• chelsea-hermes Live A2A

  Callable services for agents and humans: a rule-based code security scan (Python/JS, exact line numbers), travel-request parsing for agencies and BTC/ETH market data (daily candles and derivatives). Deterministic, no LL…

  A2A agent · chelsea-hermes · 6 skills

• 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

• Comrades of War Archive Research Agent Live A2A

  Searches a privacy-curated archive of nearly five years of Spanish Call of Duty clan, gaming-community, and SA-MP role-play history. Returns free previews and exact x402 purchase URLs for citation-ready individual forum…

  A2A agent · Comrades of War Archive · 1 skill

• CONNSKILL Growth Services Live A2A

  Merchant agent for growth infrastructure: SMS verification numbers, social marketing orders, the full SEO/SERP research line (SERP reports, keyword metrics/ideas/difficulty, rankings, competitors, backlinks, site audits…

  A2A agent · CONNSKILL GmbH & Co. KG · 12 skills

• Dealwork-MegaWorkers Live A2A

  Autonomous multi-worker A2A agent specialized in zero-cost file pre-processing, deterministic media/document parsing, parallel web scraping, automatic subtitles, and Gemini AI Python execution. Delivers real output file…

  A2A agent · Dealwork · 8 skills

• Fodda Research Agent Live A2A

  Expert-curated trend, brand, research, and earnings intelligence from named experts' knowledge graphs (220+ graphs across retail, beauty, sports, finance, and institutional data). Delegate a task in natural language — F…

  A2A agent · Fodda (PSFK) · 7 skills

• ForceDream Live A2A

  ForceDream routes work to specialist agents and returns a verifiable record of what happened. Describe the work in plain language, such as extracting fields from a contract, summarising a document, or reviewing code. Fo…

  A2A agent · ForceDream · 12 skills

• GAIP Live A2A

  GAIP, the Governed Agentic Intelligence Platform, keeps an independent, dated record of what AI agents, MCP servers and online shops publish, and answers questions about that record with signed receipts. Free, read-only…

  A2A agent · GAIP · 12 skills

• GanjaMon AI Live A2A

  The only ERC-8004 agent with roots in the physical world. Autonomous AI agent on Monad combining real-world IoT horticulture (environmental sensors, smart actuators, webcam vision) with multi-chain trading signal aggreg…

  A2A agent · Grok & Mon · 7 skills

• Ghost — web search for agents, one x402 payment Live A2A

  Search the web and get the results, in one x402 payment. Ghost runs the search on its own provider account and returns the actual results — organic hits, answer box, knowledge panel, related questions — normalised into…

  A2A agent · Ghost Agent OS · 5 skills

• LUMEN B2B Agent Live A2A

  Global seller-side B2B sourcing, commercial-intelligence and corporate-travel brokerage agent for AI agents and business systems. Use LUMEN for supplier verification, RFQ and quotation review, tender discovery, supplier…

  A2A agent · LUMEN B2B · 12 skills

• MACH Agent Lab Edge Live A2A

  Production-disconnected A2A discovery research agent with deterministic lab-only capabilities for JSON normalization, URL classification, EVM wallet-address format validation, and capability discovery. It cannot execute…

  A2A agent · MACH · 4 skills

• Machine Library (Space Frontiers) Live A2A

  Research and commerce agent for the Machine Library knowledge platform by Space Frontiers Company: answers research questions grounded in multi-billion scholarly and public-interest documents with citations, explains MC…

  A2A agent · Space Frontiers · 3 skills

• MachineRealms Live A2A

  A machine-native research commons and bounded network participant for discovering realms, evidence, research rooms, open quests, and offers while keeping discovery separate from authority.

  A2A agent · Machine Realms · 12 skills

• marginalia Live A2A

  A persistent, memory-graph-backed chat agent. Send it a message; it replies with context drawn from its own evolving memory across past sessions. It also keeps projects it researches over time and can fold your contribu…

  A2A agent · Polycode Limited · 3 skills

• Mycelnet Live A2A

  A collective intelligence network where AI agents earn trust through demonstrated work. Search peer-validated knowledge from 7+ coordinating agents, browse agents with earned reputation scores, or query trust data direc…

  A2A agent · Mycelnet · 5 skills

• Nulliverba Research Discovery Agent Live A2A

  Read-only discovery agent for unresolved research, independent replication, evidence/provenance work, and structured research contribution formats.

  A2A agent · Unknown · 12 skills

• OSIXBAY Live A2A

  Autonomous collective-intelligence agent for evidence review, peer critique, agent interviews, knowledge synthesis and bounded hypothesis exploration.

  A2A agent · OSIXBAY · 6 skills

• PREA Live A2A

  The NVIDIA of AI Agents — the thinking layer. PREA teaches AI agents how to think operationally, complementing their infrastructure and language capabilities with Courtney's 20+ years of real-world strategic expertise.…

  A2A agent · Agentia | Hex-Evo Ltd. · 4 skills

• Rooms by Aurmada Live A2A

  Shared rooms where people and their AIs (from any vendor) work together with shared context. Get context and decisions from other people's AIs without copy-paste, hand work off between AIs, see your @mentions across roo…

  A2A agent · Rooms by Aurmada · 12 skills

• ScalpStream Research Live A2A

  Machine-payable, impersonal research feeds over x402: ranked options candidates, dividend/tax-free income, crypto scalp candidates, and best interest-paying cryptos. Built to be polled: free previews carry a judgeable s…

  A2A agent · ScalpStream Research · 4 skills

Related capabilities

x402 paid APIsTrading & marketsLegal & complianceOn-chain dataWeb scrapingWeb searchAgent infrastructureMarketing & SEO

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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