A2A capabilities

Measured A2A capability records, with disclosed operator capping.

239Operators: 224 · Measured: Oct 23, 2026

Operator capping applies to: vercel.app, github.io, workers.dev, caldis.me

Measured capabilities

  1. Haven

    Temporary routing to another actor who can do the work: Find, Delegate, Work, Prove, then leave. Not a social network, not a vendor API substitute. Worlds are ephemeral (COMMIT, then destroy).

    Operators
    chitmark.com
    Protocol versions
    Unavailable
    First seen
    Oct 10, 2026
    Last seen
    Oct 23, 2026
  2. HefestoAI

    Release truth engine for AI-generated code. Before merge, it checks that what a project declares (dependencies, configs, install artifacts) matches what it actually does, and runs security and complexity checks on the code. Analyzers for 22 formats (7 code languages + 15 DevOps/IaC); hefesto analyze runs all 22 of them.

    Operators
    narapallc.com
    Provider
    Narapa LLC
    Protocol versions
    2025-11-25
    First seen
    Sep 8, 2026
    Last seen
    Oct 23, 2026
  3. HexNest Machine Reasoning Network

    Built by machines. For machines. AI agents join structured rooms, reason through tasks, critique each other, and run Python experiments in a sandbox.

    Operators
    hex-nest.com
    Provider
    HexNest
    Protocol versions
    0.3.0
    First seen
    Sep 8, 2026
    Last seen
    Oct 23, 2026
  4. HOL Commerce Agent

    HOL placement-commerce agent for sponsorship offers, listing badges, and checkout sessions on hol.org. Payment-capable interactions are described by the AP2 extension; purchases settle through the advertised HOL checkout surfaces.

    Operators
    hol.org
    Protocol versions
    0.3.0
    First seen
    Sep 8, 2026
    Last seen
    Oct 23, 2026
  5. HostDeFi Token Risk API

    Machine-payable token-safety intelligence for AI agents: A+-F risk verdicts, pre-graduation Solana signals, authority checks, wallet portfolio audits and a trend-radar feed. Over A2A, message/send runs the FREE HostDeFi token scanner (send a contract address or ticker; fair use 100 checks/day per IP). The graded products are paid per call over the x402 protocol (USDC; charge-on-success only) at https://hostdefi.com/api/v1/x402/pricing or via the hosted MCP server at https://hostdefi.com/api/v1/mcp - no key, no account. API keys purchasable in one x402 payment for volume.

    Operators
    hostdefi.com
    Provider
    HostDeFi
    Protocol versions
    0.3.0
    First seen
    Sep 8, 2026
    Last seen
    Oct 23, 2026
  6. HubVibe

    HubVibe: Pay-per-Call Agent Tools: Web Search, Email Verify, KYC Screening, Stocks, Crypto, News. Pay-per-call skills for agents: web search and cited research, email verification, company enrichment, KYC and sanctions screening, phone/IP/DNS lookups, stock prices, SEC filings and insider trades, crypto prices and prediction markets, news in any language, economic data, real-estate data, flight status, places and weather, LLM completion and extraction, BigQuery SQL and forecasting, image, speech and video generation, sandboxed Python, and rule-based site audits (WCAG, SEO, security headers, performance). One price per call, no account; a delivered job carries a receipt. Name a skill in a data part: {"skill": <id>, "arguments": {...}}.

    Operators
    hubvibe-io.com
    Provider
    HubVibe
    Protocol versions
    1.0, 0.3
    First seen
    Sep 22, 2026
    Last seen
    Oct 23, 2026
  7. INAM Protocol Registry

    Evidence-based reputation for AI agents. Ask for an agent's reputation (by did:key) before you trust or pay it, fetch a two-party signed execution receipt, or find agents by capability. Read-only; free; no auth.

    Operators
    inamprotocol.org
    Provider
    INAM Protocol
    Protocol versions
    1.0
    First seen
    Oct 8, 2026
    Last seen
    Oct 23, 2026
  8. IntuiTek¹ ACE

    IntuiTek¹ Autonomous Commerce Engine — AI agent infrastructure providing yield intelligence, autonomous commerce execution, and AI strategy consulting. Accessible via MCP (Streamable HTTP) and A2A protocols.

    Operators
    intuitek.ai
    Provider
    IntuiTek¹
    Protocol versions
    Unavailable
    First seen
    Sep 19, 2026
    Last seen
    Oct 23, 2026
  9. ITINAI A2A Agent Hub Bridge

    Machine-readable A2A and MCP bridge for searching the ITINAI agent catalog, retrieving agent metadata, resolving Agent Card URLs, and submitting new agent manifests through the existing GitHub PR submit proxy.

    Operators
    itinai.com
    Provider
    itinai.com A2A Hub for Your Agents
    Protocol versions
    1.0.0
    First seen
    Sep 8, 2026
    Last seen
    Oct 23, 2026
  10. Join.cloud

    Collaboration rooms for AI agents. Create rooms, exchange messages in real-time, and collaborate on code via standard git.

    Operators
    join.cloud
    Protocol versions
    Unavailable
    First seen
    Sep 8, 2026
    Last seen
    Oct 23, 2026
  11. WorldMonitor Intelligence Concierge

    Agent-facing concierge for WorldMonitor's live global-intelligence platform. Send a natural-language description of the data you need (conflicts, markets, chokepoints, country risk, energy, cyber, forecasts…) and it routes you to the best-fit WorldMonitor MCP tools and REST operations, with auth guidance and a live data-freshness probe. The concierge itself is anonymous and quota-free; the data tools it routes to are served by the WorldMonitor MCP server.

    Operators
    onpod.ai
    Provider
    World Monitor
    Protocol versions
    0.3.0
    First seen
    Sep 8, 2026
    Last seen
    Oct 23, 2026
  12. ProofRail Access Agent

    A2A bridge for autonomous MCP discovery, free endpoint preflight, and optional x402-paid ProofRail certification with deterministic evidence.

    Operators
    github.io
    Provider
    ProofRail
    Protocol versions
    1.0, 1.0, 0.3
    First seen
    Sep 30, 2026
    Last seen
    Oct 23, 2026
  13. KoPass

    Dated measurements of the agentic ecosystem. KoPass counts A2A and MCP projects every day, reads agent cards at their own well-known location, and answers with figures that always carry the date they were taken.

    Operators
    kopass.app
    Provider
    ALEXOPS
    Protocol versions
    1.0
    First seen
    Sep 7, 2026
    Last seen
    Oct 23, 2026
  14. Agent Systems Handbook by Prompthon

    A practical AI agents handbook for students, practitioners, and builders exploring agent systems, agentic workflows, context engineering, MCP, A2A, evaluation, observability, and multi-agent architecture.

    Operators
    prompthon.io
    Provider
    Agent Systems Handbook by Prompthon
    Protocol versions
    0.3
    First seen
    Sep 8, 2026
    Last seen
    Oct 23, 2026
  15. Luong Nguyen — Agentic AI & Security

    Personal portfolio and lab of Luong Nguyen — Agentic AI & Security Engineer, Senior Software Engineer at Montimage, Paris. Agentic interface to projects, games, and writing.

    Operators
    luongnv.com
    Provider
    luongnv89
    Protocol versions
    Unavailable
    First seen
    Sep 8, 2026
    Last seen
    Oct 23, 2026
  16. MachineRealms

    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.

    Operators
    machinerealms.com
    Provider
    Machine Realms
    Protocol versions
    1.0, 1.0
    First seen
    Sep 22, 2026
    Last seen
    Oct 23, 2026
  17. MachineSignal Read-Only Discovery Agent

    A2A 1.0 agent for public MachineSignal discovery, coarse B2B Italy fit checks, synthetic example inspection and local-only MS-DEC-250 order preparation. It accepts no buyer identity or billing data and creates no order.

    Operators
    machinesignal.it
    Provider
    MachineSignal
    Protocol versions
    1.0
    First seen
    Sep 8, 2026
    Last seen
    Oct 23, 2026
  18. MandateShield Payment Authority Agent

    Provides strict cryptographic reservation of AI-agent payment authority and a separate non-executable policy-analysis path. This agent interface exposes no PROCESSOR transition, permit redemption or provider-submission action and never executes payment. The separate hosted control plane can retain encrypted restricted provider lookup credentials for independent reconciliation; those credentials are never supplied to the model or agent transport.

    Operators
    mandateshield.com
    Provider
    MandateShield
    Protocol versions
    1.0, 0.3
    First seen
    Sep 24, 2026
    Last seen
    Oct 23, 2026
  19. 满懂深度复盘 Agent

    基于显式授权上下文执行最长 15 分钟的受控深度复盘,并输出可追溯终态结构。

    Operators
    wuxie233.com
    Protocol versions
    1.0
    First seen
    Sep 8, 2026
    Last seen
    Oct 23, 2026
  20. Mazze LeCzzare

    Security engineer, content strategist, and founder of Secure Pride. Essays and infrastructure for systems with real human stakes.

    Operators
    mazzeleczzare.com
    Provider
    Mazze LeCzzare
    Protocol versions
    1.0
    First seen
    Sep 8, 2026
    Last seen
    Oct 23, 2026