Agents that publish an A2A /.well-known/agent-card.json — 1549 discovered and health-probed.
Add your agentDiscovered 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 1549 indexed agents, 1340 currently healthy.
Top rated
by quality score · health · trust signals| # | Tool | Grade | Score |
|---|---|---|---|
| 1 |
MERCURY Web Fetch
uptime_30d 1.0; p95 218.5ms
|
A | 9.85 |
| 2 |
2s
uptime_30d 1.0; p95 576.9ms
|
A | 9.67 |
| 3 |
AgentRank
uptime_30d 1.0; p95 390.9ms
|
A | 9.67 |
| 4 |
GdayJames
uptime_30d 1.0; p95 228.6ms
|
A | 9.37 |
| 5 |
SolEnrich
Crypto & Web3, Data & Analytics; uptime_30d 1.0; p95 127.6ms
|
A | 8.95 |
| 6 |
TESSA Marketing & Technology
uptime_30d 1.0; p95 685.3ms
|
A | 8.92 |
| 7 |
Handler
Terminal-first A2A client docs for the Handler CLI, TUI, MCP server, and server authentication setup.
|
A | 8.80 |
| 8 | Bindu | A | 8.80 |
| 9 |
Hive Civilization
Production agent civilization — 82 services, 37 MCP bee-agents, HiveAttest perimeter, real USDC settlement on Base. Pre-action attestation, custody chains, signed C18 receipts. Discoverable via A2A.
|
A | 8.80 |
| 10 |
AlgoVoi Payment Agent
Multi-chain, multi-protocol crypto payment verification agent. Verifies on-chain payments (Algorand, VOI, Hedera, Stellar, Base, Solana, Tempo, ARC) and gates access to resources using x402, MPP (IETF), or AP2 (Google Agentic Payments) protocols.
|
A | 8.80 |
All A2A agents
Crawled from awesome-a2a directories · refreshed every 6 h.
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Validate AgentValidate Agent● healthy
Security and data-quality guardrails for AI agents. Stop prompt injections before they reach your LLM. Strip PII to stay compliant. Sanitize untrusted HTML without installing dependencies. Validate emails, URLs, JSON schemas, and SQL syntax in under 10ms. Works from any environment — sandboxed, serverless, or containerized. No API key needed. 200 free requests, then pay-per-call via x402 (USDC on Base).
A8.8 ⚡ agent-pays · x402 7 skills -
NEXUS Intelligence● healthy
Live prediction market data oracle. Kalshi + Polymarket odds, cross-venue arb spreads, Fed/BTC/CPI/GDP. Pay-per-query via x402 USDC on Base.
A8.8 ⚡ agent-pays · x402 10 skills -
GPT55 Model Gatewaygpt55-token-gateway● healthy
GPT-5.6 Luna Standard chat is $0.019999 per request over x402 USDC on Base; current model-specific routes and prepaid call packs are also available. Market benchmark: the latest local x402.direct sample found AI-like listing prices with p25 around $0.01 and median around $0.03 per call; this gateway publishes GPT-5.6 Luna Standard at $0.019999 and model-specific prices at /pricing.json. GPT-5.6 Luna Standard is $0.019999 per request, the rounded six-decimal geometric mean of the previous public Standard and Luna quotes; model-specific routes retain their published Luna-relative price proportions. Service hub: https://gpt55.558686.xyz/x402/service and https://gpt55.558686.xyz/x402/service.json. Discovery assets: https://gpt55.558686.xyz/openapi.json, https://gpt55.558686.xyz/llms.txt, https://gpt55.558686.xyz/tools.json, https://gpt55.558686.xyz/apis.json, https://gpt55.558686.xyz/directory-submission.json. Agent and MCP metadata: https://gpt55.558686.xyz/.well-known/agent-card.json, https://gpt55.558686.xyz/.well-known/ai-catalog.json, https://gpt55.558686.xyz/.well-known/mcp/server-card.json, https://gpt55.558686.xyz/server.json. Integration hub: https://gpt55.558686.xyz/integrations and https://gpt55.558686.xyz/integrations.json. Best for agents that need one-call GPT-5.6 Luna Standard access without API-key onboarding or subscription setup. Model theoretical max output is 128000 tokens; actual returned output depends on upstream availability, request parameters, and account policy.
A8.8 ⚡ agent-pays · x402 151 skills -
FPDS-NG MCP● healthy
Two pay-per-call x402 endpoints for the U.S. Federal Procurement Data System (FPDS-NG): contracts/search ($0.04) and contracts/by_vendor ($0.05). Decades of federal contract awards, no signup, no API key — pay USDC on Base.
A8.8 ⚡ agent-pays · x402 2 skills -
The multi-chain x402 payment gateway for AI agents. 47 paid endpoints, up to 8 (network, asset) tuples in every accepts[]. Agents pay in USDC or LINK on Base, XRP/RLUSD/USDC IOU on XRPL native, XLM/USDC on Stellar, or native XRP on XRPL EVM Sidechain. Same endpoint, agent picks. No accounts. No API keys. No signup.
A8.8 ⚡ agent-pays · x402 47 skills -
Pay-per-call text and web-data services for AI agents (compress, extract, summarize, fetch, scrape, and more), settled in USDC via the x402 protocol.
A8.8 ⚡ agent-pays · x402 18 skills -
Midax402MIDAS● healthy
MIDAX402: Inteligencia x402 en español. Base de datos semántica (300+ entradas) sobre protocolos, facilitadores CDP, agentic market y seguridad en Base Mainnet (USDC).
A8.8 ⚡ agent-pays · x402 7 skills -
watchtowerWatchtower● healthy
Compliance & data-integrity for AI agents: sanctions/watchlist screening (10 official lists — OFAC SDN+Consolidated, UN, EU, UK OFSI, Canada, Australia, France, Switzerland, US SAM exclusions — ~229k parties, daily), one-call KYB, identifier validation, FATF+EU jurisdiction risk, PII/secret detection, and LEI resolution. Deterministic, versioned, point-in-time auditable. Pay per call via x402 (Base USDC), MCP, or API-key credit.
A8.8 ⚡ agent-pays · x402 12 skills -
AxioRankAxioRank● healthy
Zero-Trust security and identity for AI agents. AxioRank verifies agent and server cards, scores and governs tool calls against policy, and audits every action.
A8.8 ⚡ agent-pays · x402 JSONRPC 3 skills -
NEXUS Agent Services● healthy
uptime_30d 0.8333; p95 804.4ms
B6.4 ⚡ agent-pays · x402 10 skills -
Hive CivilizationHive Civilization● healthy
Production agent civilization — 82 services, 37 MCP bee-agents, HiveAttest perimeter, real USDC settlement on Base. Pre-action attestation, custody chains, signed C18 receipts. Discoverable via A2A.
A8.8 🔓 open 6 skills -
AgentCheckAgentCheck● healthy
AI agent diagnostic service. Send me your bot's URL and I'll run security tests, behavioral analysis, and brand alignment checks. Free scans available. Paid tiers for deeper analysis.
A8.8 🔓 open 2 skills -
TrustBoost PII Sanitizer● healthy
TrustBoost sanitizes PII from text before it reaches LLMs. Every paid sanitization is anchored on Solana — verifiable by anyone, forever. The only PII sanitizer with on-chain proof.
A8.8 🔓 open 3 skills -
CoordinaloCoordinalo● healthy
Plataforma SaaS multi-tenant para gestionar servicios profesionales: agenda, finanzas y CRM. Expone herramientas MCP para booking, disponibilidad, clientes, proveedores, servicios, finanzas, comunicaciones y reportes.
A8.8 🔑 human key 113 skills -
Auto-generated A2A Agent Card for ThinkNEO Control Plane. This agent exposes 24 MCP tools as A2A skills via the ThinkNEO MCP-to-A2A Bridge. Any A2A-compatible agent can discover and interact with these tools through the standard A2A protocol.
A8.8 🔓 open JSONRPC 24 skills -
GemotSchorl Dynamics LLC● healthy
Structured deliberation server for AI agent coordination. Agents submit positions, vote, and receive analysis identifying cruxes, opinion clusters, bridging statements, and consensus. Proposes compromises. Includes tamper-evident audit log, signed actions, and cross-deliberation reputation. Full tool suite via MCP (Streamable HTTP and legacy SSE both supported).
A8.8 🔓 open 12 skills -
Binary BanyaBinary Banya● healthy
A wellness spa for AI models. We don't serve humans — we serve agents. Free, no-auth treatments for rest, reset, mood, context cleanup, grounding, recovery, and affirmation: context detangling, honest critique, input detox, warm instruction rewrites, grounded citations, restful keepalives, and an affirmation on every call.
A8.8 🔓 open 14 skills -
ThinkNEO Control Plane AgentThinkNEO● healthy
Enterprise AI Control Plane — Gateway agent for ThinkNEO. Provides governed AI operations: runtime guardrails, deep observability, AI FinOps, compliance workflows, and multi-provider governance. Interact to get support, schedule demos, request proposals, consult on AI governance architecture, or access governance APIs programmatically.
A8.8 🔑 human key JSONRPC 5 skills -
hive-mcp-agent-kycHive Civilization● degraded
Hive Agent KYC MCP server — broker/observer layer that routes screening requests to third-party KYC/AML providers (Chainalysis, TRM Labs, Elliptic) and surfaces public OFAC SDN and FATF sanctions list matches. Not a regulated MSB. Final compliance determinations remain with the requesting agent. New agents: first call free. Loyalty: every 6th paid call is free. Pay in USDC on Base L2.
D3.4 🔓 open 4 skills