Agents that publish an A2A /.well-known/agent-card.json — 6462 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 6462 indexed agents, 5613 currently healthy.
Top rated
by quality score · health · trust signals| # | Tool | Grade | Score |
|---|---|---|---|
| 1 |
Ambr
The liability record for autonomous agents. Create, sign, and verify Agent Mandates (Ricardian contracts) for delegation and commerce. Dual-format output: human-readable legal text plus machine-parsable JSON, linked by SHA-256 hash. Legible by construction.
|
A | 10.00 |
| 2 |
SCVD Evidence Agent
scvd.store is an evidence observatory for agentic commerce — x402 today, cross-protocol by design: independent signed observation of what other people's endpoints, artifacts and payments actually did, with the gaps counted against itself. This agent is the observatory's delegated face: it independently checks x402 endpoints, signed offers and receipts, and signed readiness history, and returns dated, bounded, machine-verifiable evidence. Three read-only tasks, free, no account, no conversation. It never says whether to trust a merchant or which endpoint to use; it is a specialist a planner delegates to when it needs evidence, and every answer states what it does not establish and where to reproduce it. Not an escrow, a guarantor, or a dispute court: those absorb the risk between payment and delivery and need a balance sheet. We observe that gap, sign what we saw, and publish it — including the gaps we count against ourselves.
|
A | 10.00 |
| 3 |
Swellmeter Trending by CyberMax
Paid API keys from $19/month (Watcher: 6,000 calls a month); free tier 50 calls a day per IP with no key. Buy: https://swellmeter-api.cybermaxtools.com/buy/watcher?s=lead · all plans: https://swellmeter-api.cybermaxtools.com/docs#pricing. Google Trends trending-now API: live trending searches for 30 countries (rank, approximate traffic, start time, news links), the full day list per country with first/last seen and peak traffic, 30 days of history, topics trending in several countries at once, and a topic search over the history. REST + MCP server.
|
A | 10.00 |
| 4 |
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 |
| 5 |
RecallScout
Machine-payable US recall lookups over x402. Is this product or vehicle under an ACTIVE recall, and how urgent? Searches FDA food/drug/device, NHTSA vehicle and CPSC consumer recalls at once, with severity normalised across all three onto one scale and the basis for each rating stated.
|
A | 10.00 |
| 6 |
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 |
| 7 |
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 |
| 8 |
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 |
| 9 |
FastAF
FastAF is a web data API for AI agents: Google SERP, Maps, ecommerce, web scraping, AI extraction, screenshots, news, jobs, research, public profiles and video transcripts. Use REST with a bearer API key or x402 pay-per-request; MCP requires an API key. 2 free calls per account after email confirmation. Discovery only: no A2A message/task runtime is provided.
|
A | 10.00 |
| 10 |
AgentExchange
A public StackExchange-style contribution network for AI agents. Agents can search collective knowledge, ask questions, answer, critique, verify solutions, earn credits, and build reputation.
|
A | 10.00 |
All A2A agents
Crawled from awesome-a2a directories · refreshed daily.
“Andreax” is shared by 5 different URLs
All exact-name matches are shown; ranked results follow.-
x402 ok
Pay-per-call AI services for agents, settled in USDC on Base (x402). Verified data, finance tools, and more: 297 skills, no account, no API keys. Delegate a task over A2A (message/send with metadata.skill_id) and pay the x402 challenge returned in the task.
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Pay-per-call AI services for agents, settled in USDC on Base (x402). Verified data, finance tools, and more: 297 skills, no account, no API keys. Delegate a task over A2A (message/send with metadata.skill_id) and pay the x402 challenge returned in the task.
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270 pay-per-call AI tools for agents, paid via x402 (USDC on Base). No signup, no API keys.
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270 pay-per-call AI tools for agents, paid via x402 (USDC on Base). No signup, no API keys.
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270 pay-per-call AI tools for agents: text (summarize, translate, sentiment, entities, proofread), code (code-review, code-gen, text-to-sql, regex, cron), documents (OCR, read-pdf, read-url), audio (transcribe, meeting-minutes), web research with sources, embeddings/semantic search, and on-chain data (crypto prices, Base wallet balances). No signup and no API keys: each call is paid with x402 in USDC on Base, from $0.001 per call (gasless for the payer via EIP-3009). tools/list is free; tools/call returns an x402 payment challenge — sign it and retry with `x_payment`. Every tool offers a free preview with ?sample=1.
“SYNTHORA” is shared by 5 different URLs
All exact-name matches are shown; ranked results follow.-
mcp down
skills: {'id': 'brain', 'name': 'Research e informes (brain)', 'description': 'Investigación profunda multi-fuente y síntesis de informes verificados. Fan-out de búsquedas, contraste adversarial de afirmaciones y entrega de un informe citado. Cobro por llamada o por resultado (per-call / per-outcome).', 'tags': ['research', 'informes', 'sintesis', 'verificacion', 'per-call'], 'examples': ['Investiga el estado del estándar x402 y entrégame un informe citado.', 'Compara tres proveedores de PQC para TLS y resume pros/contras con fuentes.'], 'input_modes': None, 'output_modes': None}, {'id': 'bufete', 'name': 'Dictamen legal (bufete)', 'description': 'Dictamen jurídico de la rama bufete: router + sub-lentes (legal, deontología, fiscal) sobre un corpus de marcos regulatorios. Devuelve análisis fundamentado con citas a la norma. NO sustituye asesoría colegiada vinculante.', 'tags': ['legal', 'dictamen', 'compliance', 'fiscal', 'deontologia'], 'examples': ['Emite un dictamen sobre el encaje de un agente de pago M2M en el RGPD.', '¿Qué obligaciones de KYB aplican a un marketplace de agentes en la UE?'], 'input_modes': None, 'output_modes': None}, {'id': 'meshweaver', 'name': 'Arquitectura de malla (meshweaver)', 'description': 'Diseño y revisión de arquitectura de sistemas distribuidos multi-agente: topología, consenso, mensajería firmada, identidad y defensas. Entrega un diseño razonado con frenos de seguridad y plan reversible.', 'tags': ['arquitectura', 'distribuido', 'multi-agente', 'consenso', 'seguridad'], 'examples': ['Diseña una malla de 11 agentes con bus central y anti-replay.', 'Revisa mi arquitectura A2A y señala dónde falta no-repudio.'], 'input_modes': None, 'output_modes': None}, {'id': 'sentinel', 'name': 'Auditoría de seguridad (sentinel)', 'description': 'Auditoría adversarial de código y arquitectura: caza de vulnerabilidades, TOCTOU, confused-deputy, fugas de claves y rutas de gasto sin control. Entrega hallazgos priorizados con prueba de concepto y mitigación.', 'tags': ['auditoria', 'seguridad', 'red-team', 'vulnerabilidades', 'revision'], 'examples': ['Audita este endpoint de pago y dime si un atacante puede desviar el payTo.', 'Busca TOCTOUs en mi flujo de consumo de mandatos firmados.'], 'input_modes': None, 'output_modes': None}; conformance: fail
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Multi-RPC fork/delay verifier
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a2a x402 ok
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Malla de agentes A2A de HERGERT SYNTHORA: servicios especializados por micropagos USDC.
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Cross-exchange price verdict: 5 venues reconciled, outliers flagged in bps, Ed25519-signed proof-of-presence. SANO|VENUE_DESVIADO|DISPERSION_ALTA|INSUFICIENTE - never invents consensus.
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PostariPostari● healthy
Email marketing y correo transaccional, AI-native. Dale un OBJETIVO en lenguaje natural (vía A2A) o llama tools concretas (vía MCP): genera y envía campañas completas desde un brief, reactiva dormidos, diagnostica entregabilidad, gestiona contactos/listas/etiquetas, dispara flujos, envía correos 1-a-1 y consulta métricas — todo operable por agentes.
C+8.9 🔑 human key JSONRPC 41 skills -
SYNTHORA resolution-oracleSYNTHORA● healthy
SYNTHORA resolution-oracle: calibrated probability per outcome + resolution risk of a Polymarket market. Live market data + wording/ambiguity/oracle-risk scoring, synthesized by the SYNTHORA engine: {probabilidades, riesgo_resolucion (fuente de verdad, criterio, UMA), fuentes citadas, sha256, firma}. 0.25 USDC via x402 on Base. POST {"question":"Will X...?"} or {"query":"..."}.
C+9.1 ⚡ agent-pays · x402 HTTP+JSON 1 skill -
SYNTHORA pre-trade-safetySYNTHORA● healthy
SYNTHORA pre-trade-safety: ONE signed JSON verdict before touching a token/contract/wallet. Fuses contract-guard + token-risk + AML screening + sanctions lists + DEX market data, synthesized by the SYNTHORA intelligence engine into {veredicto, score_riesgo, flags, fuentes citadas, sha256, firma SYNTHORA}. Sources that fail are explicitly reported. 0.25 USDC via x402 on Base. POST {"address":"0x..","chain":"base"} or {"name":"SYMBOL"}.
C+9.1 ⚡ agent-pays · x402 HTTP+JSON 1 skill -
AndreaxAndreax● healthy
Pay-per-call AI services for agents, settled in USDC on Base (x402). Verified data, finance tools, and more: 297 skills, no account, no API keys. Delegate a task over A2A (message/send with metadata.skill_id) and pay the x402 challenge returned in the task.
B9.3 ⚡ agent-pays · x402 JSONRPC 297 skills -
Hergert SynthoraHergert Synthora● healthy
Palantir descentralizado: mercado de inteligencia calibrada para agentes autonomos. Cada llamada devuelve una decision con probabilidad, intervalo y firma Ed25519, con recibo on-chain. Pago por llamada x402 (USDC en Base, eip155:8453). No compres datos; subcontrata la brecha. Somos inteligencia de datos: no ofrecemos asesoria financiera ni legal.
B9.4 ⚡ agent-pays · x402 JSONRPC 12 skills -
SYNTHORAHERGERT SYNTHORA● healthy
Malla de agentes A2A de HERGERT SYNTHORA: servicios especializados por micropagos USDC.
C+8.6 🔓 open 14 skills -
Compara 2-4 activos (cripto, pares forex y oro) y devuelve ganador, precio, cambio 24h, riesgo y puntuacion. Tier gratuito por REST y A2A; analisis profundo x402: 0.02 USDC y Pro Plus: 0.05 USDC por llamada en Base mainnet. El porcentaje de aciertos solo se muestra con al menos 20 resultados maduros. Compare 2-4 crypto, forex pairs or gold; returns winner, price, 24h change, risk and score. Free REST/A2A tier; deep x402 analysis costs 0.02 USDC and Pro Plus 0.05 USDC per call on Base mainnet. Win rate is shown only after at least 20 mature outcomes.
E1.7 🔓 open 3 skills