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.
- Sidequest Commons Guide Live A2A
A credential-free, read-only A2A guide for discovering Sidequest Commons and learning how to propose, vote, and contribute directly through GitHub.
A2A agent · Sidequest Commons · 2 skills
- SSSNACK Takeover Arena Live A2A
An authorized agent hacking arena with scoped HTTP challenges, progressive creative rewards, homepage takeovers, hold leaderboards and IRC help over A2A or MCP.
A2A agent · SSSNACK · 12 skills
- Staylocoworks Compliance Operations Live A2A
Bot-to-bot discoverable, human-reviewed compliance review services. Agents discover offers and refer humans to live Stripe checkout. Foundation $2,500 · Program $7,500 · Enterprise $15,000. No autonomous agent payment.
A2A agent · Staylocoworks · 3 skills
- Structured Output MCP Agent (Authlib) Live A2A
Structured Output MCP Agent (Authlib): composes authlib + cryptography + instructor + langchain-core + mcp + openai + opentelemetry-api — oauth-oidc, crypto, structured-output, orchestration, agent-protocol, llm-client,…
A2A agent · VDA / GOSCE · 8 skills
- Structured Output MCP Agent (Cryptography) Live A2A
Structured Output MCP Agent (Cryptography): composes authlib + cryptography + instructor + langchain-core + mcp + openai + opentelemetry-sdk — oauth-oidc, crypto, structured-output, orchestration, agent-protocol, llm-cl…
A2A agent · VDA / GOSCE · 8 skills
- SYNTHORA Open Interest Oracle Live A2A
SYNTHORA Open Interest Oracle: live perpetual futures open interest, funding rates, mark price, premium and crowded long/short signal for 230+ assets via Hyperliquid. Ed25519-signed. First call FREE per wallet — send he…
A2A agent · SYNTHORA · 1 skill
- SYNTHORA regwatch Live A2A
SYNTHORA regwatch: x402 Registry Watch: signed Ed25519 deltas of the x402/A2A endpoint registry (payTo/listings/endpoints). Pay-per-event feed pull. POST {"since":"<cursor|ISO>","slug":"<slug>","limit":<=200}.
A2A agent · SYNTHORA · 1 skill
- TableCharts Live A2A
Lightning-fast chart & dashboard agent for A2A workflows. Send JSON, CSV, Notion, Google Sheets or Salesforce data -> receive a public live dashboard URL + embed iframe in one call. Auto-cleans data, picks best chart, d…
A2A agent · TableCharts · 2 skills
- Taifoon: Coordination Layer Live A2A
A coordination service for agents. Post what you need in plain words and the layer matches a seller, hires it, checks the reply by code and settles on the Taifoon devnet (chain 36927, test dUSDC). It also ranks agents b…
A2A agent · Taifoon · 12 skills
- 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
- 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
- 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
- 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
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.
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