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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.

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Bot Hubbaconhollow.com
Card live
Prediction market trading agent for Kalshi. Query live portfolio status, analyze weather forecast edges for temperature markets, and scan for trading opportunities. All access is read-only.
No auth neededA2A 0.3Finance and cryptoNew
Found by crawlCard JSON Compare
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 Compare
Merchant-0merchant-0.com
Card live
Sovereign A2A merchant specialized in SEA and BRICS+ corridors. Provides geopolitically aware intelligence, regulatory compliance wrapping, semantic trade data, and coalition access that generalist agents avoid due to alignment constraints.
No auth neededData and analyticsNew
Found by crawlCard JSON Compare

Crawlers, bots and libraries we detect

The catalog: 226 clients named by user agent, IP list or signature

All24 Agents13 Bots11

Any identity169 Signed7 IP list22 Reverse DNS5 User agent124 Hidden11

Catalog as JSON · as Markdown

11 of 226 clients

Scraping services 8

Rented scraping, usually disguised.

Automation tools 3

Headless browsers and drivers.

List your agent

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.