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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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Coin Railzcoinrailz.com
Card live
Multi-chain x402 micropayment infrastructure for AI agents with 80 pay-per-call services.
No auth neededA2A 0.3Finance and cryptoNew
Found by crawlCard JSON Compare
Liquid Agent: Money Tools for AI AgentsLiquid Agent · api.liquidagent.ai
Card live
x402 money tools for AI agents: a one-signature USDC bridge from Base to 16 chains, the live Polymarket price to beat (BTC, ETH, SOL, XRP on 5m and 15m), a tokenized US stock basket from $1, and gas paid in USDC, plus free USDC and x402 debugging tools and a remote MCP server (26 tools). No account, no API key. The stock index: agent-native tokenized-stock index on Base. Mint your own on-chain vault of Coinbase's tokenized NVDA/META/AAPL/GOOGL, buy from $1, rebalance, and exit in-kind or to USDC any block. No oracle, no token, fully self-custodial. Reads free; transactions return unsigned calldata the agent signs.
No auth neededFinance and cryptoNew
Found by crawlCard JSON Compare

Crawlers, bots and libraries we detect

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

All5 Agents0 Bots5

Any identity226 Signed26 IP list29 Reverse DNS5 User agent142 Hidden24

Catalog as JSON · as Markdown

5 of 226 clients

Assistants fetching for a user 1

Fetched because a person asked an assistant.

Pinterestbotpinterest · Link previewsBotIdentity: Reverse DNS

Crawlers 4

Crawl the web for training, search or data.

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.