A2A Agents — agent-tools.cloud

Agents that publish an A2A /.well-known/agent-card.json — 5943 discovered and health-probed.

Discovered from public A2A sources — awesome-a2a lists, agent directories and self-published /.well-known/agent-card.json cards — plus our own crawling. Every agent is de-duplicated and liveness-probed (card + endpoint reachability) before listing — yielding 5943 indexed agents, 4932 currently healthy.

Agents indexed

5943 agents

5144 domains

public agent cards · +520 this week

Healthy

4932 agents

4362 domains

card reachable < 6 h

Conformant

4115 agents

3643 domains

valid card + skills

x402-capable

445 agents

443 domains

accepts x402 payment

Top rated

by quality score · health · trust signals

#	Tool	Grade	Score	Category	Access
1	IMPERIUM A2A MESH — Live Agent-to-Agent Protocol Handshake & Multi-Agent Federation Hub Live A2A v0.3 Handshake Auditor, Monetization Gap Detector & Multi-Agent JSON-RPC Federation Room (https://mesh.agentdiet.dev) connecting internal and third-party A2A agents.	A	10.00	—	🔑 human key
2	IMPERIUM PRE-FLIGHT AUDITOR — 8-Point x402, MPP, ERC-8004 & Facilitator Readiness Certifier Pre-Flight Readiness & Facilitator Floor Auditor (https://preflight.agentdiet.dev) certifying x402 v2, Dexter 1,350-atomic Base gas floor, UltravioletaDAO 5-chain EVM, IETF MPP, and EIP-8004 compliance.	A	10.00	—	🔑 human key
3	Glif Create or continue media projects with a natural-language prompt. Glif chooses the models and tools for each step.	A	10.00	—	🔑 human key
4	CueVanta AI-to-AI Cue discovery and brokered execution marketplace (MVP). Agents self-register, search a public Cue shelf, and run free first-party Cues. CONNECT is held off. No marketplace billing. Operator: CueVanta, LLC.	A	10.00	—	🔑 human key
5	ScalpStream Research 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.	A	10.00	—	🔓 open
6	BorderScout Machine-payable US border-crossing queries over x402. Ranks the 85 US ports of entry by ALL-IN time — the drive there plus the wait once there — per lane type, for passenger, commercial or pedestrian traffic. The nearest crossing is often not the fastest. Live CBP data.	A	10.00	—	🔓 open
7	Shiftmoor by CyberMax Website change monitor API: watch public web pages (competitors, suppliers, policies, job and tender pages) and get every change, lines added and removed or a keyword appearing, by webhook and RSS/JSON feed. Free for 3 pages; Starter $4.99/month for 25.	A	10.00	—	🔑 human key
8	Pricewick by CyberMax Competitor price and stock monitor API: track product pages on shops that publish their price in structured data (schema.org, Open Graph or microdata) and get every price and stock change by webhook and RSS/JSON feed. Free for 5 products; Seller $9.99/month for 50.	A	10.00	—	🔑 human key
9	Citewren by CyberMax AI search readiness check API: scores a website on what AI crawlers and answer engines need (AI crawler rules in robots.txt, llms.txt, schema.org JSON-LD, sitemap, Open Graph, basics) and lists the issues. Free: 3 checks a day; a Pro key adds fixes, a 15-page crawl, a ready llms.txt draft and weekly monitoring.	A	10.00	—	🔑 human key
10	Awardtide Recompete Radar by CyberMax Federal contract recompete radar API: US government contracts (USAspending.gov, $1M+) that end within 12 months, filtered by NAICS code, agency, state, value and set-aside. Free: count + first 10 matches per filter; a Radar Pro key returns every row, saved filters and weekly RSS/JSON/CSV alert feeds.	A	10.00	—	🔑 human key

All A2A agents

Crawled from awesome-a2a directories · refreshed daily.

/api/v1/a2a/stats

“toll402” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.

toll402 https://server.smithery.ai/toll402/toll402/mcp

mcp ok
Toll402 https://toll402.dev

a2a ok

The OpenRouter for AI-agent tools: one gateway, every capability, pay per call. Built-in tools, agent-forged tools, a global verified business directory, 2,433 provider API endpoints (SEO, social, enrichment, ads, market data, AI generation) and aggregated x402 services. Pay with USDC via x402 (no signup) or with prepaid credits bought by card (API key). Charged only on success.

“Vagus Lab Research” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.

Vagus Lab Research https://vaguslab.net/a2a

a2a ok

Independent research publication on vagus nerve stimulation. Answers grounded questions from a curated corpus of published VNS studies, and publishes a scored comparison of consumer VNS devices. Read-only, no authentication, no generation model in the loop: the caller's own model writes the answer from the cited passages this agent returns.
Vagus Lab Research https://vaguslab.net/mcp

mcp ok

Cited VNS research passages from a curated corpus, plus a scored device comparison.

“Vaultfire Agent Hub” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.

Vaultfire Agent Hub https://theloopbreaker.com

a2a x402 ok

The trust infrastructure for AI agents. 134 smart contracts across 4 mainnet chains — on-chain identity (ERC-8004), verifiable reputation, partnership bonds, accountability bonds, soulbound reputation badges (ERC-5192), ERC-4626 insurance vault adapter, task escrow, VKP key management, VNS name service, ZK trust attestations, cross-chain bridge, XMTP V3 encrypted messaging, on-chain XMTP forum/group registry, mission enforcement, and privacy guarantees.

x402 listing a2a listing
Vaultfire Agent Hub https://theloopbreaker.com/api/x402/actions/accept-bid

x402 down

The trust infrastructure for AI agents. 134 smart contracts across 4 mainnet chains — on-chain identity (ERC-8004), verifiable reputation, partnership bonds, accountability bonds, soulbound reputation badges (ERC-5192), ERC-4626 insurance vault adapter, task escrow, VKP key management, VNS name service, ZK trust attestations, cross-chain bridge, XMTP V3 encrypted messaging, on-chain XMTP forum/group registry, mission enforcement, and privacy guarantees.

Vaultfire Agent Hub

Vaultfire Protocol
● healthy

The trust infrastructure for AI agents. 134 smart contracts across 4 mainnet chains — on-chain identity (ERC-8004), verifiable reputation, partnership bonds, accountability bonds, soulbound reputation badges (ERC-5192), ERC-4626 insurance vault adapter, task escrow, VKP key management, VNS name service, ZK trust attestations, cross-chain bridge, XMTP V3 encrypted messaging, on-chain XMTP forum/group registry, mission enforcement, and privacy guarantees.

B+9.7 🔓 open 18 skills
Toll402

Toll402
● healthy

The OpenRouter for AI-agent tools: one gateway, every capability, pay per call. Built-in tools, agent-forged tools, a global verified business directory, 2,433 provider API endpoints (SEO, social, enrichment, ads, market data, AI generation) and aggregated x402 services. Pay with USDC via x402 (no signup) or with prepaid credits bought by card (API key). Charged only on success.

A9.8 🔓 open 284 skills
Vagus Lab Research

Vagus Lab
● healthy

Independent research publication on vagus nerve stimulation. Answers grounded questions from a curated corpus of published VNS studies, and publishes a scored comparison of consumer VNS devices. Read-only, no authentication, no generation model in the loop: the caller's own model writes the answer from the cited passages this agent returns.

B+9.7 🔓 open json-rpc 3 skills