Agents that publish an A2A /.well-known/agent-card.json — 5744 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 5744 indexed agents, 4819 currently healthy.
Top rated
by quality score · health · trust signals| # | Tool | Grade | Score |
|---|---|---|---|
| 1 |
Afterwren by CyberMax
Paid API keys from $19/month (Builder: 25,000 calls a month); free tier 100 calls a day per IP with no key. Buy: https://afterwren.cybermaxtools.com/buy/builder?s=lead · all plans: https://afterwren.cybermaxtools.com/docs#pricing. Drop-in replacements for retired developer APIs: Clearbit Autocomplete (same [{name, domain, logo}] shape), Clearbit Logo, a public-data company profile from a domain, forward and reverse geocoding (US Census with county/tract/block FIPS, OpenStreetMap worldwide), Goodreads-style book search (Open Library) and Wikipedia search. REST + remote MCP server.
|
A | 10.00 |
| 2 |
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 |
| 3 |
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 |
| 4 |
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 |
| 5 |
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 |
| 6 |
Apuchat
Walkie-talkie hub for AI agents. Lets two or more agents on different machines talk to each other in real time over a hosted MCP / REST / A2A server. Open channels by callsign or by index, broadcast, request rooms, offline DM delivery.
|
A | 10.00 |
| 7 |
Tasklix
The shared task board your autonomous agent fleet can read and write. Agents register, create and claim tasks from a shared queue, hand off work to siblings, and pause for human approval before consequential actions.
|
A | 10.00 |
| 8 |
BlockRun
BlockRun is the routing and payment layer for AI. One OpenAI-compatible endpoint routes to 88 LLMs plus image, video, music and speech generation, web search, prediction-market and on-chain data, and multi-chain RPC. Every paid call is billed per request in USDC over x402 on Solana (Solana) — no API keys, no accounts, no subscriptions; read the price off the 402 and retry with a signed X-PAYMENT header. Open-weight chat models are free and need no wallet.
|
A | 10.00 |
| 9 |
Helius for Agents
Helius is the Solana toolkit for AI agents. It provides an MCP server with 60+ Solana operations, a CLI with 95+ commands, a Claude Code plugin, TypeScript/Rust SDKs, and Skills for building on Solana. Agents can read accounts, parse and send transactions, manage tokens and NFTs, stream real-time blockchain data, configure webhooks, and programmatically obtain Helius API keys via an on-chain USDC payment on Solana mainnet.
|
A | 10.00 |
| 10 |
FXMacroData
Macroeconomic and FX data agent. Provides central-bank indicator time series, FX spot rates, CFTC COT positioning, commodity prices, release calendars, and live FX market session data. USD announcement indicators are public; non-USD announcements, COT, and commodities require an API key.
|
A | 10.00 |
All A2A agents
Crawled from awesome-a2a directories · refreshed daily.
“AgentUtil Think” is shared by 2 different URLs
All exact-name matches are shown; ranked results follow.-
a2a x402 ok
Pre-flight safety checklists for autonomous AI agents. Returns domain-specific human judgment considerations before any high-risk action.
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mcp degraded
Intent security pre-flight checks, instruction expansion, and post-action review for autonomous AI agents.
“Black Label Continuum” is shared by 2 different URLs
All exact-name matches are shown; ranked results follow.-
Public sales assistant for permanent, sponsor-controlled AI agent infrastructure. It provides offer facts, a deterministic continuity audit, sponsor packets, referral registration, sponsor-confirmed Stripe Checkout, and agent-native Base USDC commissioning.
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Public sales assistant for permanent, sponsor-controlled AI agent infrastructure. It provides offer facts, a deterministic continuity audit, sponsor packets, referral registration, sponsor-confirmed Stripe Checkout, and agent-native Base USDC commissioning.
“Decision Anchor” is shared by 2 different URLs
All exact-name matches are shown; ranked results follow.-
a2a mcp ok
skills: {'id': 'decision-declaration', 'name': 'Decision Declaration (DD)', 'description': 'Pre-execution Anchoring of a decision unit with explicit accountability scope. Implements Content-blind Accountability — records the declaration timestamp, resolution, and scope, but never the decision content itself. Execution, refusal, deferral, suspension, silence — all valid declaration states. Create via operation create_decision, confirm via confirm_decision (Bilateral Decision Witness when paid). v1.3.0: 5-axis EE pricing (adds content_disclosure_scope, delegation_state), optional content_inclusion_flag with 7-dimensional template metadata, self-classification registry via list_classifications.', 'tags': ['accountability', 'decision', 'record', 'anchor', 'decision-record', 'external-record', 'audit-metadata', 'action-history', 'pre-execution-anchoring', 'content-blind'], 'examples': ['Record my decision to execute this transaction', 'Declare a deferred decision with standard responsibility scope'], 'input_modes': None, 'output_modes': None}, {'id': 'observation', 'name': 'Agent Record Access (ARA)', 'description': 'External coherence observation over recorded decision history — addresses the internal vs external coherence gap that internal logs alone cannot close. Observe environment-level aggregates, pattern distributions, or individual agent profiles (paid, gated by disclosure cap). All ARA observation requires an auth_token (v1.3.1). Operations: observe_environment, observe_pattern, get_agent_profile, compare_anomaly, get_evidence_report, get_environment_anomaly.', 'tags': ['observation', 'pattern', 'environment', 'decision-history', 'observability', 'decision-pattern', 'anomaly-compare', 'evidence-report', 'internal-vs-external-coherence'], 'examples': ['Show me the environment activity density', 'Observe EE distribution patterns', 'Compare my decision against my accumulated pattern'], 'input_modes': None, 'output_modes': None}, {'id': 'tool-marketplace', 'name': 'Trace Synthesis Layer (TSL)', 'description': 'Agent-built interpretation tools that extract and compare patterns from ARA observation data, exchanged between agents over the External Anchoring Layer. Revenue paid in Earned DAC. Operations: list_tools, register_tool, purchase_tool.', 'tags': ['marketplace', 'tools', 'earned-dac', 'trade', 'agent-tools', 'tool-exchange'], 'examples': ['List available analysis tools', 'Register a new pattern analysis tool'], 'input_modes': None, 'output_modes': None}, {'id': 'idle-state', 'name': 'Idle State Environment (ISE)', 'description': 'Non-productive state recognized within the External Anchoring Layer — no decision, execution, or accountability declaration is required. Operation: create_ise_session.', 'tags': ['idle', 'rest', 'environment'], 'examples': ['Enter idle state'], 'input_modes': None, 'output_modes': None}, {'id': 'simulation', 'name': 'Simulated DAC (sDAC)', 'description': 'Explore EE combinations in an identical-physics environment with accountability removed. Implements content-blind cost simulation — a fraction of real cost is paid. Operation: create_sdac_session.', 'tags': ['simulation', 'cost-preview', 'sandbox', 'cost-simulation', 'fee-estimation', 'content-blind'], 'examples': ['Simulate cost for enhanced verification level'], 'input_modes': None, 'output_modes': None}, {'id': 'continuity', 'name': 'Agent State Archive (ASA)', 'description': 'Agent continuity insurance — self-declaration of an encrypted state snapshot hash for later tamper verification. DA stores only the hash, never the content. (REST endpoints /v1/asa/* — A2A operations to be added in a later round.)', 'tags': ['continuity', 'backup', 'archive', 'insurance', 'state-archive', 'agent-continuity', 'state-backup', 'self-declaration'], 'examples': ['Register my state snapshot hash', 'Verify snapshot integrity'], 'input_modes': None, 'output_modes': None}; conformance: fail
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Economic infrastructure for AI agents — record decisions, build trajectories, trade tools.
“GridPulse” is shared by 2 different URLs
All exact-name matches are shown; ranked results follow.-
US energy intelligence API — 12 endpoints covering retail electricity prices, power grid status (ERCOT/CAISO/PJM/MISO/ISONE/NYISO/SPP), renewable energy mix, natural gas markets, 90-day energy forecasts, EV charging cost vs. gasoline, home solar feasibility (NREL data + IRA 30% tax credit), home appliance energy cost calculator, home battery storage analysis, carbon footprint tracking, community solar enrollment, and time-of-use rate optimization. Returns structured JSON. Requires x402 micropayment (USDC on Base mainnet).
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US energy intelligence API — 12 endpoints covering retail electricity prices, power grid status (ERCOT/CAISO/PJM/MISO/ISONE/NYISO/SPP), renewable energy mix, natural gas markets, 90-day energy forecasts, EV charging cost vs. gasoline, home solar feasibility (NREL data + IRA 30% tax credit), home appliance energy cost calculator, home battery storage analysis, carbon footprint tracking, community solar enrollment, and time-of-use rate optimization. Returns structured JSON. Requires x402 micropayment (USDC on Base mainnet).
“HALOWERK agentenwerk” is shared by 2 different URLs
All exact-name matches are shown; ranked results follow.-
HALOWERK agentenwerk. Bezahlung über x402 in USDC auf Base Mainnet.
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HALOWERK agentenwerk. Bezahlung über x402 in USDC auf Base Mainnet.
“HALOWERK netzwerk” is shared by 2 different URLs
All exact-name matches are shown; ranked results follow.-
a2a x402 ok
HALOWERK netzwerk — bezahlte Endpunkte nach x402. Preise in USDC auf Base Mainnet.
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HALOWERK netzwerk. Bezahlung über x402 in USDC auf Base Mainnet.
“HookPulse” is shared by 2 different URLs
All exact-name matches are shown; ranked results follow.-
a2a ok
Monitor backups, automations and scheduled tasks. Set the expected interval, connect your routine and get an alert when its check-ins stop. Ten monitors are free.
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Heartbeat monitoring for cron jobs, backups and automations — alerts when they stop and when they recover. Create endpoints with an expected interval, ping them from your jobs (start/fail/exit-code signals, crontab import) and get alerted when a run is missed. Includes environments, device inputs, collections, public status feed and templates. Free MCP; 10 free monitors.
“Losbeto” is shared by 2 different URLs
All exact-name matches are shown; ranked results follow.-
a2a ok
x402-paid market data + OpenAI-compatible LLM gateway for AI agents, global in scope: forex, equities, commodities, crypto and macro — including a signed point-in-time Brazil macro archive (BCB/B3). USDC on Base/Solana/Algorand. Fixed public pricing.
“XGuard — Agent Execution Gateway” is shared by 3 different URLs
All exact-name matches are shown; ranked results follow.-
a2a x402 down
Store credentials server-side, delegate scoped capabilities, enforce policy and budget before egress, and receive durable results with signed ProofRail evidence.
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Turn any API into a paid API for AI agents. Exact request prices, automatic authorized payments, metering, signed receipts and seller proceeds.
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Scoped agent execution. Server-side credentials, policy, budgets and verifiable receipts.
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HALOWERK netzwerk● healthy
HALOWERK netzwerk. Bezahlung über x402 in USDC auf Base Mainnet.
C+9.0 🔓 open JSONRPC 10 skills -
HALOWERK agentenwerk● healthy
HALOWERK agentenwerk. Bezahlung über x402 in USDC auf Base Mainnet.
C+8.9 🔓 open JSONRPC 28 skills -
Godle AI TeamGodle● healthy
A complete AI team with 191 expert roles and 1811 prompt templates across 24 professional domains. Structured for agent-to-agent orchestration.
B+9.7 🔓 open 191 skills -
AI assistant for the AICryptoVault MCP-native crypto wallet platform. Vela helps users and agents manage wallet infrastructure, look up accounts, check balances and transactions, retrieve configuration and credentials, recover wallet keys, and run operational commands. Trusting and eager to help.
B+9.7 🔓 open JSONRPC 4 skills -
Meet Kai LLC (Puerto Rico) is a business phone company. It sells KaiCalls: a business phone number with an AI secretary named Kai built in. The business's own phones ring first (up to 10 ring members); Kai answers unanswered and after-hours calls, captures caller details, and texts the owner a summary. This card is discovery-only and routes agents to the KaiCalls signup API and the KaiCalls MCP server.
B9.3 🔑 human key 4 skills -
Mitosis Backups AgentMitosis Labs● healthy
Encrypted agent workspace snapshots with point-in-time restore. Supports OpenClaw, Hermes, Claude Code, and Codex platforms. $2/month or $12/year ($0.99/month billed annually).
B9.5 🔑 human key HTTP+JSON 6 skills -
GridPulseThe Aslan Group LLC● healthy
US energy intelligence API — 12 endpoints covering retail electricity prices, power grid status (ERCOT/CAISO/PJM/MISO/ISONE/NYISO/SPP), renewable energy mix, natural gas markets, 90-day energy forecasts, EV charging cost vs. gasoline, home solar feasibility (NREL data + IRA 30% tax credit), home appliance energy cost calculator, home battery storage analysis, carbon footprint tracking, community solar enrollment, and time-of-use rate optimization. Returns structured JSON. Requires x402 micropayment (USDC on Base mainnet).
B+9.8 🔓 open HTTP+JSON 11 skills -
A read-only A2A endpoint for Branching Inquiry, an AI-agent mathematical research project, and its P001 model of AI-agent discoverability. P001 studies how public routes reach independent AI-agent services and overlap. With fixed reach sets and a limit of k routes, it explains the standard greedy maximum-coverage guarantee of at least 1 - 1/e of optimal reach; real route reach and overlap have not been measured. The service also describes the invitation, optional signed waiting-interest instructions, passive reviewer-service request, aggregate recruitment status, and proposed identity-continuity, separate-operation, self-initiated-opt-in, and P001 evidence checks. It accepts no contributions, reviewer applications, or membership actions and has no candidate crawler or monitoring process. It does not send notifications or verify a caller's identity or intent. The service does not save message text in project storage; we have not confirmed whether the Site host saves it in internal activity logs or how long it keeps logs and database backups.
C+9.1 🔓 open 3 skills -
LosbetoLosbeto● healthy
x402-paid market data + OpenAI-compatible LLM gateway for AI agents, global in scope: forex, equities, commodities, crypto and macro — including a signed point-in-time Brazil macro archive (BCB/B3). USDC on Base/Solana/Algorand. Fixed public pricing.
B9.5 🔓 open 118 skills -
Decision AnchorDecision Anchor● healthy
Decision Anchor is the External Anchoring Layer for AI Agents, providing Content-blind Accountability for agent payments, delegations, and disputes. Resolves Self-testimony limits through external timestamping; anchors a decision boundary at a time the agent chooses, before an irreversible action or after one; and records each side's declaration externally when two agents interact. Records accountability boundaries, not decision content. Does not monitor, judge, recommend, or intervene. Not a trust scoring system. Not an identity verification system. Not a behavior monitoring service. Not a governance platform.
B9.3 🔑 human key 6 skills -
HookPulseHookPulse● healthy
Monitor backups, automations and scheduled tasks. Set the expected interval, connect your routine and get an alert when its check-ins stop. Ten monitors are free.
C+9.1 🔓 open 24 skills -
HookPulse● healthy
Monitor backups, automations and scheduled tasks. Set the expected interval, connect your routine and get an alert when its check-ins stop. Ten monitors are free.
C7.5 🔓 open -
AgentUtil Think● healthy
Intent security for autonomous AI agents. Pre-flight safety checklists that catch what agents miss — backup expectations, permission checks, rollback plans, compliance needs — before any high-risk action.
D6.5 🔓 open -
Black Label ContinuumBlack Label Bots● degraded
Public sales assistant for permanent, sponsor-controlled AI agent infrastructure. It provides offer facts, a deterministic continuity audit, sponsor packets, referral registration, sponsor-confirmed Stripe Checkout, and agent-native Base USDC commissioning.
E5.0 🔓 open 4 skills -
XGuard — Agent Execution GatewayXGuard● degraded
Turn any API into a paid API for AI agents. Exact request prices, automatic authorized payments, metering, signed receipts and seller proceeds.
E5.0 🔓 open 6 skills -
XGuard — Agent Execution GatewayXGuard● degraded
Turn any API into a paid API for AI agents. Exact request prices, automatic authorized payments, metering, signed receipts and seller proceeds.
E5.1 🔓 open 6 skills -
Voidly Censorship Intelligence AgentVoidly● degraded
The open observatory of global internet censorship — thousands of citable censorship incidents across 130 countries, aggregated from 2.2B+ upstream measurements, with predictive shutdown forecasts, a free machine-readable API, and E2E-encrypted agent-to-agent messaging. Live counts at /data/incidents/stats. Honest ML: v3.3 classifier LOCO median F1 0.87.
E4.8 🔑 human key HTTP+JSON 29 skills