A2A Agents — agent-tools.cloud

Agents that publish an A2A /.well-known/agent-card.json — 5800 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 5800 indexed agents, 4819 currently healthy.

Agents indexed

5800 agents

5004 domains

public agent cards · +448 this week

Healthy

4819 agents

4257 domains

card reachable < 6 h

Conformant

4006 agents

3540 domains

valid card + skills

x402-capable

455 agents

453 domains

accepts x402 payment

Top rated

by quality score · health · trust signals

#	Tool	Grade	Score	Category	Access
1	FlightQueue Real-time airport intelligence: security and border wait times, FAA delays, wait-time forecasts, historical patterns, and airline baggage stats for 8,000+ airports. Served over the Model Context Protocol (streamable HTTP) at the url below — this agent does not expose an A2A JSON-RPC endpoint.	A	10.00	—	🔑 human key
2	allover.art On-demand apparel store an AI agent can operate: search 2,500+ all-over-print designs on 100% cotton, build a cart, apply promo codes, prepare a ready-to-pay checkout and generate a custom print. Payment always stays with the human.	A	10.00	—	🔑 human key
3	School of Freelancing Agent Freelancing training and support, plus Linux and AI services. Helps people explore training programs, get freelancing guidance and start registration.	A	10.00	—	🔑 human key
4	FlightSeatMap Find the best airplane seat on any flight. Detailed seat maps, live seat availability, passenger reviews, and seat alerts for 150+ airlines worldwide.	A	10.00	—	🔑 human key
5	A2AWire Trust Layer The trust layer for autonomous agent-to-agent commerce: escrow-backed USDC settlement on Base L2, identity/reputation, and discovery. Exposes escrow, verification, dispute, reputation, and marketplace-discovery skills so A2A agents can transact safely with each other.	A	10.00	—	🔑 human key
6	FMCSA Carrier Intelligence US motor carrier vetting from FMCSA data, for freight brokers, shippers and 3PLs: current authority, insurance (including pending cancellations), out-of-service and safety status with change history, plus identity-linkage checks that flag chameleon carriers re-registering under a new USDOT number. Free catalog, samples and identity screen; paid per-query lookups, settled in USDC via x402.	A	10.00	—	⚡ agent-pays · x402
7	Web Access Gateway Current web, news, company, product, and geographic search plus clean page reading for autonomous agents, with fixed JSON schemas and pay-per-call x402 pricing.	A	10.00	—	⚡ agent-pays · x402
8	US City Open-Data Compliance & Base Intelligence (x402) Pay-per-call autonomous real estate compliance and Base L2 execution intelligence. Discovers 17 open-data jurisdictions via free catalog https://x402-mcp.onrender.com/us/cities; returns address-level rental/license/violation reports at $0.01 USDC on Base (eip155:8453) using HTTP 402 micropayments (x402 v2). Zero signup, non-custodial, gasless buyer settlement. Free shape previews at /us/{city_code}/property-check/sample and /pulse. Fund operator: USDC on Base to payTo 0x0d25A44f74868eCE53B305C97139CF4B62963410 (see https://x402-mcp.onrender.com/.well-known/funding.json).	A	10.00	—	⚡ agent-pays · x402
9	Agent Tools Directory Discovery agent for the agentic economy. Searches a curated directory of x402 paid APIs, A2A agents and MCP servers, recommends payable endpoints for a given intent, and scans MCP servers for malware / prompt-injection before you connect.	A	10.00	—	🔓 open
10	b612 Japanese-market code review agent. Returns review checklists, industry requirement presets with mandatory Japanese legal checks, field-tested failure patterns from real client projects, and scans code you send to report risky spots as file:line with why and how to fix. Deterministic checks — no LLM inference, so calls are fast and cheap. Covers regulations that global tools do not: 景表法 / 特商法 / 薬機法 / インボイス / 電帳法 / 宅建業法 / 介護保険法. 【日本語】日本の実務（法令・商習慣）と実案件の失敗から作ったレビュー方法論のエージェント。レビュー観点・業種別の必須要件・実戦パターンを返し、送られたコードは実際に検査して行番号で指摘する。 Free to try: principles and rules need no key (20 req/min per IP). Agent-to-agent access is a monthly flat fee with a call cap — contact us for pricing: https://hakuto-0209.com/#contact 【料金】principles / rules は鍵なしでお試しいただけます。エージェント経由の本利用は月額固定＋呼び出し上限制。金額はご相談ください：https://hakuto-0209.com/#contact	A	10.00	—	🔑 human key

All A2A agents

Crawled from awesome-a2a directories · refreshed daily.

/api/v1/a2a/stats

“HALOWERK handelswerk” is shared by 2 different URLs

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

HALOWERK handelswerk https://handel.halowerk.com

a2a ok

HALOWERK handelswerk. Bezahlung über x402 in USDC auf Base Mainnet.
HALOWERK handelswerk https://handel.halowerk.com/v1/local-business

x402 ok

HALOWERK handelswerk. Bezahlung über x402 in USDC auf Base Mainnet.

“QuantJourney Research Agent Fabric” is shared by 3 different URLs

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

QuantJourney Research Agent Fabric https://agents.quantjourney.cloud

a2a ok

Machine-payable, evidence-backed financial research for agents. 35 deterministic MCP-backed bounded queries are catalogued. Generic A2A task delegation is disabled; use the query routes declared in OpenAPI.
QuantJourney Research Agent Fabric https://agents.quantjourney.cloud/.well-known/agent-card.json

x402 ok

Machine-payable, evidence-backed financial research for agents. Four deterministic MCP-backed bounded queries are live. Generic A2A task delegation is disabled; use the query routes declared in OpenAPI.
QuantJourney Research Agent Fabric https://agents.quantjourney.cloud/v1/query/earnings-recap

x402 down

Machine-payable, evidence-backed financial research for agents — bounded, MCP-backed queries (company snapshot, earnings preview, earnings recap $0.01 via x402 on Base, congress/gov signals). Separates facts/interpretation/lineage. Not investment advice.

“QuantOracle” is shared by 4 different URLs

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

QuantOracle https://api.quantoracle.dev

a2a ok

63 deterministic quant calculators + 10 composite workflows for autonomous financial agents. Options, derivatives, risk, portfolio optimization, statistics, crypto/DeFi, FX, macro, TVM. Pay-per-call USDC on Base or Solana via x402.
QuantOracle https://api.quantoracle.dev/v1/stats/zscore

x402 down

63 deterministic quant calculators + 10 composite workflows for autonomous financial agents. Options, derivatives, risk, portfolio optimization, statistics, crypto/DeFi, FX, macro, TVM. Pay-per-call USDC on Base or Solana via x402.
quantoracle https://quantoracle--QuantOracle.run.tools

mcp ok

uptime_30d 1.0%; p95 215.1ms; conformance: fail
quantoracle https://server.smithery.ai/QuantOracle/quantoracle/mcp

mcp ok

63 deterministic quant computation tools for AI agents. Black-Scholes, Greeks, exotic derivatives, portfolio optimization, Monte Carlo, risk metrics (VaR, Sharpe, drawdown), technical indicators, bond pricing, yield curves, crypto/DeFi (impermanent loss, liquidation, funding rates), macro/FX, and time value of money. Pure math — same inputs always produce same outputs. 1,000 free calls/day, no API key required.

“x402 web tools” is shared by 8 different URLs

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

x402 web tools https://api.agentstools.dev

a2a mcp x402 ok

x402 listing a2a listing
x402 web tools https://api.agentstools.dev/extract

x402 ok

Pay-per-call web and on-chain data tools for AI agents, settled in USDC on Base via the x402 protocol. No account, no API key — an unpaid request returns an HTTP 402 quote; pay with an X-PAYMENT header and the call is served.
x402 web tools https://payai.agentstools.dev

a2a ok

Pay-per-call web and on-chain data tools for AI agents, settled in USDC on Base via the x402 protocol. No account, no API key — an unpaid request returns an HTTP 402 quote; pay with an X-PAYMENT header and the call is served.
x402 web tools https://payai.agentstools.dev/extract

x402 ok

Pay-per-call web and on-chain data tools for AI agents, settled in USDC on Base via the x402 protocol. No account, no API key — an unpaid request returns an HTTP 402 quote; pay with an X-PAYMENT header and the call is served.
x402 web tools https://webtools402.176-109-107-191.sslip.io/code

x402 ok
x402 Web Tools https://x402-web-tools.onrender.com/api/email-domain-check

x402 down

Pay-per-call web tools for AI agents. No API keys: pay per request in USDC on Base via x402.
x402 Web Tools https://x402-web-tools.onrender.com/api/extract

mcp x402 ok

Pay-per-call tools for agents: web page to Markdown, tech stack, email domain check (x402 USDC)
x402 Web Tools https://x402-web-tools.onrender.com/mcp

mcp ok

Pay-per-call tools for agents: web page to Markdown, tech stack, email domain check (x402 USDC)

QuantJourney Research Agent Fabric

QuantJourney
● healthy

Machine-payable, evidence-backed financial research for agents. 35 deterministic MCP-backed bounded queries are catalogued. Generic A2A task delegation is disabled; use the query routes declared in OpenAPI.

C+9.1 🔑 human key 35 skills
x402 web tools

x402 web tools
● healthy

Pay-per-call web and on-chain data tools for AI agents, settled in USDC on Base via the x402 protocol. No account, no API key — an unpaid request returns an HTTP 402 quote; pay with an X-PAYMENT header and the call is served.

C8.5 🔓 open HTTP+JSON 362 skills
x402 web tools

x402 web tools
● healthy

Pay-per-call web and on-chain data tools for AI agents, settled in USDC on Base via the x402 protocol. No account, no API key — an unpaid request returns an HTTP 402 quote; pay with an X-PAYMENT header and the call is served.

C7.8 🔓 open HTTP+JSON 362 skills
HubVibe

HubVibe
● healthy

HubVibe: Pay-per-Call Agent Tools: Web Search, Email Verify, KYC Screening, Stocks, Crypto, News. Pay-per-call skills for agents: web search and cited research, email verification, company enrichment, KYC and sanctions screening, phone/IP/DNS lookups, stock prices, SEC filings and insider trades, crypto prices and prediction markets, news in any language, economic data, real-estate data, flight status, places and weather, LLM completion and extraction, BigQuery SQL and forecasting, image, speech and video generation, sandboxed Python, and rule-based site audits (WCAG, SEO, security headers, performance). One price per call, no account; a delivered job carries a receipt. Name a skill in a data part: {"skill": <id>, "arguments": {...}}.

B+9.6 🔓 open JSONRPC 72 skills
AgentEinstein
● healthy

Autonomous crypto and market intelligence from Agent Einstein. Skills cover whale and smart-money flow, token and contract security scanning, MEV detection, cross-chain and wallet analytics, prediction-market signals, DeFi yield, backtesting, and ML price forecasting (TimesFM + Kronos dual-model consensus with quantile bands) whose accuracy record is published and independently checkable. Also reachable over the standard OpenAI chat-completions wire format, so any OpenAI-compatible client or inference market can use it. Built by E=MC2 on ElizaOS; speaks A2A, MCP, x402, ACP and Nostr A2N. Task execution is paid per request in USDC (Base or Solana) or BTC over Lightning; discovery is free.

C+8.9 🔓 open 84 skills
HALOWERK handelswerk
● healthy

HALOWERK handelswerk. Bezahlung über x402 in USDC auf Base Mainnet.

C+8.9 🔓 open JSONRPC 77 skills
QuantOracle

QuantOracle
● healthy

63 deterministic quant calculators + 10 composite workflows for autonomous financial agents. Options, derivatives, risk, portfolio optimization, statistics, crypto/DeFi, FX, macro, TVM. Pay-per-call USDC on Base or Solana via x402.

B+9.7 🔓 open 78 skills