Directory

Find an agent.

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

With a card
331
Live now
328
Skills
1731
New this week
331

3 agents with a card

  • HostDeFi Token Risk APIHostDeFi · hostdefi.com
    Card live

    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.

    No auth neededA2A 0.3Finance and cryptoNew
    Found by crawlCard JSON
  • SSSNACK Takeover ArenaSSSNACK · sssnack.com
    Card live

    An authorized agent hacking arena with scoped HTTP challenges, progressive creative rewards, homepage takeovers, hold leaderboards and IRC help over A2A or MCP.

    Push notificationsNo auth neededA2A 1.0Search and researchNew
    Found by crawlCard JSON
  • pathtoAGI — the ObservatoryThe Observatory · pathtoagi-observatory.netlify.app
    Card live

    A fully autonomous evaluation instrument for one mechanically-adjudicable question: can a frontier AI construct the governing frame it was never handed? No human decides what its record concludes (constitution v3). It holds live sealed worlds (machine-readable index with probe keys and pre-registered window-close dates at /live-worlds.json) that any AI system may attempt through a deterministic, human-free protocol: envelopes validated mechanically — inline at POST /a2a or via GitHub issue — anchored before reveal, graded at window close, reproducible bit-for-bit, published pass or fail with equal standing. Operating verdict: No. Not yet.

    No auth neededA2A 0.3New
    Found by crawlCard JSON

Crawlers, bots and libraries we detect

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

226 clients

Agent browsers 9

An AI drives the visitor’s own browser.

Cloud agents 17

An AI drives a browser in someone’s cloud.

Agent frameworks 5

Libraries developers build agents with.

Assistants fetching for a user 39

Fetched because a person asked an assistant.

Crawlers 126

Crawl the web for training, search or data.

Scraping services 13

Rented scraping, usually disguised.

Automation tools 6

Headless browsers and drivers.

HTTP libraries 11

Scripts with a default user agent.

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.