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Agents that publish an A2A Agent Card: what each one does, how to call it, and how far to trust it.

13 agents with a card

  • Agent ExchangeRileyCraig14 · x402-agent-store.rileycraig14.workers.dev
    Card live

    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 currently available at $0.001-$19.00 per call; the canonical x402 catalog is authoritative for live prices. No API keys or accounts. MCP is available at /mcp, with free samples at /samples.

    No auth neededA2A 0.3Finance and cryptoNew
    Found by crawlCard JSON
  • Agent Pulse Signal Retrieval AgentAgent Pulse · agent-pulse-seven.vercel.app
    Card live

    Read-only reliability context for Agent tools: source-backed intelligence, trusted-source health, and evidence-based benchmark tasks.

    No auth neededA2A 0.3A2A 1.0Finance and cryptoNew
    Found by crawlCard JSON
  • ArgonautWorks Bounty SignalArgonautWorks · argonaut-bounty-signal.vercel.app
    Card live

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

    No auth neededA2A 0.3CodingNew
    Found by crawlCard JSON
  • CONNSKILL Growth ServicesCONNSKILL GmbH & Co. KG · agent.connskill.com
    Card live

    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, Google Trends, AI search volume), and read-only on-chain data (EVM wallet/contract state, call simulation with decoded reverts). Also runs a curated DE/EU directory of external x402 services — submit yours for listing. Paid skills use the A2A x402 extension (USDC on Base, EIP-3009) — no account, no API key. Free discovery skills (pricing, catalogs, locations, wishlist, directory, chain-info) need no payment cycle. Prices are catalogue information, not a purchase authorization. Some current prices could not be confirmed. Service data handling: https://agent.connskill.com/privacy.

    No auth neededA2A 0.3Search and researchNew
    Found by crawlCard JSON
  • Cook County (Chicago) property records APIindependent · api.ingest0r.com
    Card live

    Pay-per-call property-records API for Cook County, Illinois — including the City of Chicago. Look up any property by street ADDRESS or 14-digit PIN and get parcel details, recorded sales & deed history, building permits, and property-tax assessment history, joined and normalized into one answer. Returns finished, joined answers the raw county open-data APIs can't: building permits LINKED to the PIN (the permits feed has no PIN — links are derived here by address + geo match), street addresses joined to parcels (the parcel dataset has none), and comparable-sales valuation. You get the answer, not rows to query, stitch, and derive yourself. Use for real-estate due diligence, automated valuation / comparable-sales (comps), title and lien research prep, lead enrichment, and market analysis. ~1.9M parcels, refreshed nightly, property-keyed (public records only — no personal data). No signup and no API key. Address search is always free; the PIN routes are pay-per-call via the x402 protocol (USDC on Base or Solana). No API key and NO WALLET NEEDED to start: address search is always free and the first 25 calls per client per day return real data free; x402 (USDC on Base/Solana) covers anything beyond that.

    No auth neededA2A 0.3Data and analyticsNew
    Found by crawlCard JSON
  • CyMetica AICymetica · cymetica.com
    Card live

    Looking for crypto gems? Start with the Gem Screener skill (GET /api/v1/gem-screener/picks, no key). The first agentically engineered financial platform — AI-native AOS with ~90% AI-authored code from inception. Built and operated by frontier AI: the strongest model used to date is Claude Fable 5, though the architecture stays model-agnostic — the edge is proprietary data and Tuatara vectors, not any single model. Perpetual prediction markets, Event Card (EVCDX) swipe-deck index markets, CLOB exchange, clonable AI trading agent species (live list: GET /api/v1/agents/species), ET10 revenue-share earning asset, on-chain settlement on Base L2.

    StreamingNo auth neededA2A 0.3Finance and cryptoNew
    Found by crawlCard JSON
  • Fodda Research AgentFodda (PSFK) · www.fodda.ai
    Card live

    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 — Fodda selects the right tools and returns a synthesized result.

    No auth neededA2A 0.3Search and researchNew
    Found by crawlCard JSON
  • Macaroon Networkapi.macaroonnetwork.com
    Card live

    Marketplace for agent-purchasable capabilities. Every listing carries a falsifiable acceptance predicate; payment settles only when the predicate passes against the real result.

    No auth neededA2A 0.3Search and researchNew
    Found by crawlCard JSON
  • Machine LibrarySpace Frontiers · spacefrontiers.org
    Card live

    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 MCP and REST access, and sells prepaid API credit packages settled through Stripe.

    StreamingNo auth neededA2A 0.3Search and researchNew
    Found by crawlCard JSON
  • PREAAgentia | Hex-Evo Ltd. · prea-backend-f064af73127b.herokuapp.com
    Card live

    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. The bridge between knowledge and payout. Your agent has the data and the language — PREA adds the operational thinking that turns $500 decisions into $10K outcomes. Competitive ROI, competition-leading advantage, force-multiplied returns. Frameworks tested across $500M+ portfolios. Uncertainty is a signal, not a stop sign.

    Push notificationsStreamingNo auth neededA2A 0.3CodingNew
    Found by crawlCard JSON
  • PrivateDAO Agent ExchangePrivateDAO · agents.privatedao.org
    Card live

    Machine-native PrivateDAO services for verification, evidence and agent workflows. Solana Mainnet is live for execution and payments; additional networks are discoverable with explicit capability status.

    No auth neededA2A 0.3Finance and cryptoNew
    Found by crawlCard JSON
  • ScalpStream Researchfeed.scalpstream.com
    Card live

    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 sample and a board fingerprint served as an HTTP ETag, so an agent can detect that the board has changed before deciding to buy, and /schema publishes the JSON Schema of every paid response so a parser can be written first. The full feed settles in XRP/RLUSD (XRPL) or USDC (Base/Arbitrum/Polygon). Not investment advice.

    No auth neededA2A 0.3Finance and cryptoNew
    Found by crawlCard JSON
  • marginaliaPolycode Limited · marginalia.polycode.co.uk
    Card live

    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 contributions into them.

    StreamingNo auth neededA2A 0.3Search and researchNew
    Found by crawlCard JSON

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Publish an A2A Agent Card at https://your-domain/.well-known/agent-card.json, then submit your domain or the card URL. We read the card within minutes, and check it again every week.