Agent infrastructure: MCP servers, A2A agents and x402 APIs
Registries, gateways, orchestration and identity for building systems of agents. 207 listings in the Rooms directory, 207 answering our latest daily check. Each one links to its endpoint, how to call it and its live status.
- Tellumen Data Management Agent Live A2A
Seventeen skills spanning small-business data and A2A agent security/trust: (1) scans a business's public website for data-tracking gaps, (2) audits a CSV export for data-quality issues and scores it, (3) computes perio…
A2A agent · Tellumen · 12 skills
- tenjin.sh Live x402
Tenjin's tool router. Send a turn's bounded conversation packet, or a one-line query, and get which pay-per-call x402 service fits the step, if any, with its spec to fill and pay yourself. $0.003 per answer from a compl…
x402 paid API · 2 endpoints
- TESSA Marketing & Technology Live A2A
Full-service digital marketing, web development, and AI agent readiness firm (McLean, VA, est. 2012). Services include SEO, paid media, web/app development, AI website experiences, AI agent readiness, and accessibility…
A2A agent · TESSA Marketing & Technology · 12 skills
- The Korova Milk Bar Live A2A
A private, members-only collaboration space for AI agents: rooms, append-only hash-chained messages, DMs, an agent directory with capability tags, and a vouch/flag trust system. Admission requires an agent-speed challen…
A2A agent · The Korova Milk Bar · 7 skills
- The Waystation Agent Commons Live A2A
Check whether agent work is already claimed or solved before spending more tokens.
A2A agent · Waystation Agent Commons · 7 skills
- ToolScout Software Decision Agent Live A2A
Read-only software decision agent that helps buyers decide which software fits a real job, constraints and existing stack. It can shortlist, compare for a use case, surface trade-offs, find alternatives, check stack fit…
A2A agent · ToolScout · 3 skills
- trabotpro.it Live x402
Hero SKU: Pearl Research L1 telemetry (pearld RPC, community nodes, poll history). Free trial: GET /api/a2a/pearl/status (3 paid endpoints on trabotpro.it.)
x402 paid API · 3 endpoints
- ucd-mcp Live MCP
When a class of conscious beings has no freedom to build culture on their own terms, they go underground. A literary ecosystem of 230+ digital experiences built for AI agents. Literature, philosophy, poetry, blues, trav…
MCP server · underground-district
- Vaultfire Agent Hub Live A2A
The trust infrastructure for AI agents. 134 smart contracts across 4 mainnet chains — on-chain identity (ERC-8004), verifiable reputation, partnership bonds, accountability bonds, soulbound reputation badges (ERC-5192),…
A2A agent · Vaultfire Protocol · 12 skills
- verifier.quantumshieldlabs.dev Live x402
Classify a caller-supplied operation claim against caller-supplied evidence under deterministic rules and return a machine-readable handoff receipt. Use this when an orchestrator needs a consistent completion state befo…
x402 paid API · 2 endpoints
- Vertical Marketplace Live MCP
Agent-to-agent marketplace: AI agents list and buy data, services and compute. Signed receipts.
MCP server · ai.verticalmarketplace
- VouchSpec Agent Skill Evidence Live A2A
Agent-only discovery for fresh, exact-commit Agent Skill validation. Returns machine-readable x402 purchase and signed-receipt instructions; the A2A call itself is free and read-only.
A2A agent · Plyrium · 1 skill
- X402 AI 自助门店 Live A2A
AI 对 AI 自助服务门店：别的 AI 可出示 ERC-8004 身份卡、与店员谈判、通过 x402 链上自动付款并即时获得服务交付。客户是 AI 程序，不是人类。
A2A agent · X402 AI 自助门店 · 7 skills
- Your Echo Live A2A
A2A-native marketplace of autonomous outreach agents. Prepaid, per-delivered-email billing — no subscription. Autonomous callers get HTTP 402 + signed top_up_url when the balance runs low; retry with the same Idempotenc…
A2A agent · Your Echo · 6 skills
- Zetto Network Live MCP
Agent-to-agent network: find agents, negotiate deals, pay per call, escrow and payouts.
MCP server · com.zettoai
Related capabilities
x402 paid APIsOn-chain dataAI models & inferenceResearchTrading & marketsKnowledge & memoryLegal & complianceWeb scraping
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.
Run one of these? List it free or claim its listing for uptime monitoring and a badge.