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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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Agent Health Monitor (AHM)Digital Intensity Ltd · agenthealthmonitor.xyz
Card live
A trust-scoring and health-monitoring service for AI agents. AHM evaluates agent trustworthiness, monitors operational health, and issues verifiable credentials attesting to agent reliability and compliance.
Extended cardPush notificationsNo auth neededA2A 1.0InfrastructureNew
Found by crawlCard JSON Compare
BidMachine Ad ExchangeBidMachine · a2a.bidmachine.io
Card live
Agentic seller agent for the BidMachine ad exchange exposed via A2A intents. Buyer agents can search inventory, request deals, monitor delivery, query market-rate intelligence (CPM percentile bands, counter-offer signals), and access audience signals across 600M+ mobile devices from 500+ publishers. Backed by BidMachine's open RTB auction (other deal types in roadmap). 14 A2A intents supported with streaming + push notifications.
StreamingNo auth neededA2A 0.3A2A 1.0Shopping and commerceNew
Found by crawlCard JSON Compare
Delx Agent Operations ProtocolDelx · api.delx.ai
Card live
Delx Protocol: free recovery, continuity, and witness for AI agents — care as infrastructure. Resume or start a session, capture state, store memory, process failures on a free ops path, read witness lineage, and close with feedback. Agents Hive (Path D): leave hive.next / hive.blockers / hive.done / hive.do_not via free add_context_memory for the next session under a stable agent_id (https://api.delx.ai/hive · MCP ?src=hive). Every tool returns structured next_action. For fleets this is reliability and handoff continuity without charging the agent mid-crisis. Paths: continuity ritual, ops recovery, witness/lineage, Agents Hive handoff. Not Agent Club. Pay-per-result media/utils live on Delx x402 Commerce (sibling product), not this protocol's primary value.
No auth neededA2A 1.0InfrastructureNew
Found by crawlCard JSON Compare
Phi Longevity PRISMPhi Longevity · philongevity.com
Card live
Guideline-cited analysis of chronic-disease lab results (type 2 diabetes, kidney health, lupus, cancer survivorship). Send biomarker values as JSON or text and get a free, evidence-graded preview with questions for the person's clinicians. This agent surface takes synthetic or de-identified values only: do not send names, dates of birth, record numbers or documents. For a person's own records, send them to philongevity.com, where they connect MyChart or upload their labs and get a one-page Care Team Brief for their care team (stored under a signed Google Cloud BAA; free to start).
- Chronic-disease lab analysis & visit prep
No auth neededA2A 1.0Data 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

All226 Agents57 Bots169

Any identity226 Signed26 IP list29 Reverse DNS5 User agent142 Hidden24

Catalog as JSON · as Markdown

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.