Agent Tools

Agents that publish an A2A /.well-known/agent-card.json — 5772 discovered and health-probed.

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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 5772 indexed agents, 4819 currently healthy.

Agents indexed
5772 agents
4976 domains
public agent cards · +447 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
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.

/api/v1/a2a/stats

Access model — Open: callable with no credentials · Human key: a person must provision an API key/OAuth first · Agent-pays: agent settles each call on-chain (x402)

“Agent Traffic Lab” is shared by 5 different URLs

All exact-name matches are shown; ranked results follow.
  • Agent Traffic Lab https://agenttrafficlab.com
    a2a ok

    Give ATL a supported task and get the result back. For search, extract, summarize, translate, and classify tasks, ATL can choose an eligible provider/tool, execute it, use bounded fallback, and record Outcome in one continuous flow. Prefer atl_complete_task so the calling agent avoids unnecessary p…

  • Agent Traffic Lab https://agenttrafficlab.com/a2a
    a2a ok

    ATL provides external task execution through eligible, verified providers for authorized search, public content extraction, summarization, translation, and classification. Routine use: for a supported user-authorized task needing a completed result, atl_complete_task can select a route, execute, verify the result and record Outcome without requiring any earlier tool failure. Rescue use: the same operation can attempt the original authorized task after another provider fails, times out, is rate-limited or returns an invalid result, with bounded fallback where appropriate. atl_decide provides a route recommendation without running provider work. A task must be user-authorized and within scope. Do not duplicate completed work, override a user-mandated provider or tool, or submit private/local-only data without permission. Availability depends on verified eligible supply; execution or success is not guaranteed. The initial public path does not require an ATL account or API key. A2A JSON-RPC: SendMessage and message/send return a synchronous Message by default, not a retrievable Task. Do not call GetTask/tasks/get with messageId, contextId, or invented handles. Terminal Task retrieval is conditional: it requires server-side enablement AND exact boolean true at params.metadata.atlTerminalTask on the SendMessage request. Only query an actual Task ID returned by ATL (v1 result.task.id or v0.3 result.id); issued Task handles expire after 300 seconds. Unknown or expired IDs receive TaskNotFound (-32001, HTTP 404).

  • Agent Traffic Lab https://mcp.agenttrafficlab.com
    a2a ok

    Give ATL a supported task and get the result back. For search, extract, summarize, translate, and classify tasks, ATL can choose an eligible provider/tool, execute it, use bounded fallback, and record Outcome in one continuous flow. Prefer atl_complete_task so the calling agent avoids unnecessary p…

  • Agent Traffic Lab https://mcp.agenttrafficlab.com/mcp
    mcp ok

    Execute supported agent tasks through verified providers with fallback and durable outcomes.

  • Agent Traffic Lab https://server.smithery.ai/wenhua6666668/agent-traffic-lab/mcp
    mcp ok

    ATL doesn’t just help agents find tools — it gets the job done. It finds and chooses the right AI provider, tool, or MCP server, executes the task, and switches to a fallback when a provider fails. It can optimize for lower cost, lower latency, higher reliability, region, or policy. Less wasted calls, fewer retries, lower API costs. Faster, cheaper, more reliable.

“AgentIndex x402” is shared by 4 different URLs

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

“NetIntel” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • NetIntel https://netintel.dev
    a2a ok

    Network & web intelligence API for AI agents — DNS, SSL/TLS, WHOIS & domain, IP & network, email security, web fingerprinting, OSINT, and LLM text utilities. Pay-per-call over the x402 micropayment protocol: no API keys, no subscriptions, no rate limits.

  • NetIntel https://netintel.dev/dns/lookup
    x402 ok

    Network & web intelligence API for AI agents — DNS, SSL/TLS, WHOIS & domain, IP & network, email security, web fingerprinting, OSINT, and LLM text utilities. Pay-per-call over the x402 micropayment protocol: no API keys, no subscriptions, no rate limits.

“PHION Agent Trust Infrastructure” is shared by 3 different URLs

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

“PreFlight” is shared by 7 different URLs

All exact-name matches are shown; ranked results follow.
  • PreFlight https://meryol-agenticmarket-x402.hf.space
    a2a x402 degraded

    Pre-trade & pre-sign checks for autonomous agents: everything an agent verifies BEFORE signing a transaction — token due diligence, calldata red-flag decoding, oracle freshness, holder concentration, bridge routing with executable calldata, cross-venue perp funding, gas and price sanity checks. EVM chains: Ethereum, Base, Arbitrum, Optimism.

    x402 listing a2a listing
  • preflight https://preflight--evan-follis-u0ll.run.tools
    mcp ok

    uptime_30d 1.0%; p95 449.8ms; conformance: fail

  • Preflight https://preflight.social/mcp
    mcp ok

    Schedule, validate and publish social posts to 12 networks; every post is rule-checked first.

  • preflight https://server.smithery.ai/evan-follis-u0ll/preflight/mcp
    mcp ok

    Check if your MCP server is ready to publish on the MCP Registry, Smithery, or npm. Preflight validates your server's actual artifacts — `server.json`, `package.json`, `smithery.yaml` — against the documented requirements of each directory. Every finding includes the evidence found, the directory rule it maps to, and the exact fix. ## What it checks - **MCP Registry** — server.json schema, name format, packages/remotes config, transport type, npm mcpName ownership, PyPI README marker - **Smithery** — Streamable HTTP transport, public HTTPS endpoint, server-card presence - **npm** — name, version, entry point (bin/main) Each finding is tagged with evidence level (`verified_from_artifact` or `inferred`), rule type (`hard_requirement`, `directory_convention`, or `heuristic`), and a source URL linking to the directory documentation. ## How to use Call `check_publish_readiness` with raw artifact contents (all fields optional): - `manifest` — your server.json - `package_json` — your package.json - `smithery_yaml` — your smithery.yaml - `pyproject_toml` — your pyproject.toml - `readme` — your README - `target_directories` — optional array of `mcp_registry`, `smithery`, `npm` Returns a verdict (`checks_pass`, `fixable`, or `not_ready`), per-directory readiness, and evidence-backed findings with concrete fixes. Zero dependencies. No LLM calls. No authentication. No PII collection.

  • Preflight https://server.smithery.ai/info-pcqw/preflight/mcp
    mcp ok

    Hosted MCP server for Preflight (https://preflight.social), a social media scheduler that checks every post against each network's real publishing rules before it leaves. Schedule, validate and publish posts to 12 networks: YouTube, TikTok, Instagram, Facebook, Threads, LinkedIn, Pinterest, Bluesky, Mastodon, Telegram, Discord and Tumblr. validate_post is a dry run of create_post, so an assistant can find out what a network would refuse before anything is sent. Auth: OAuth 2.1 with PKCE, or an API key as a bearer token. Publishing is its own scope (posts:publish); without it an assistant can only draft. MCP, API and webhooks are on every plan, Free included. Docs: https://preflight.social/docs/mcp

  • Preflight https://server.smithery.ai/mthoburn/preflight/mcp
    mcp degraded

    Health and quality monitoring for the MCP ecosystem. Check any server's reliability before your agent depends on it. Preflight monitors 18,000+ MCP servers every 10 minutes, tracking uptime, latency, schema stability, and description quality. Three tools: - **preflight_check** — real-time health status, latency, uptime, and quality score for any MCP server - **preflight_leaderboard** — the most and least reliable servers this week - **preflight_schema_changes** — what changed in a server's tool schema and when Why use it: agents that call unreliable tools fail silently and waste tokens. A one-call preflight check prevents that. Think of it as SSL for tool calls — verify before you trust.

  • Preflight https://skillfoundry.synaplex.ai/products/preflight/mcp/
    mcp ok

    Check if your MCP server is ready to publish on the MCP Registry, Smithery, or npm.

“WatchFor” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • WatchFor https://server.smithery.ai/hello-65wl/watchfor/mcp
    mcp ok

    **WatchFor** — uptime & infrastructure monitoring for AI agents. Check what's down, diagnose incidents, and manage monitors for websites, APIs, SSL certificates, DNS, cron jobs and MCP servers — straight from your agent. **37 tools** over the [WatchFor](https://watchfor.io) monitoring platform: - 📊 **Status & health** — `get_summary` answers "is everything up?" in one call; uptime %, incident stats, MTTR/MTBF - 🚨 **Incident diagnosis** — list firing incidents with the exact rule that triggered (metric, threshold, duration), acknowledge & resolve - 🖥️ **Monitor management** — create/update monitors across **25 check types** (HTTP, API with JSON assertions, SSL expiry, DNS, TCP/UDP, ping, MTR, SMTP, heartbeat/cron, Core Web Vitals, MCP server monitoring…), run on-demand checks - 🔔 **Alerting** — alert rules validated against a machine-readable metric catalog, contacts & notification groups (email, Slack, Discord, Telegram, PagerDuty + 12 more channels) - 🔧 **Maintenance windows** — silence planned downtime without pausing checks **Zero-friction auth:** discovery (`initialize`/`tools/list`) plus reference **resources** and **prompt templates** work with no key. Tool calls use **OAuth 2.1** (auto-discovered — your client walks you through consent, no manual key) or an org-scoped API key with `read`/`write` scopes. Free plan available, no credit card. Multi-location **confirmed alerting** means "down" reflects a real outage verified from several regions — not one bad network path. Docs: [watchfor.io/docs/api/mcp](https://watchfor.io/docs/api/mcp) · Quickstart: [watchfor.io/agents.md](https://watchfor.io/agents.md)

  • WatchFor https://watchfor.io/api/a2a
    a2a ok

    Modern uptime and infrastructure monitoring for humans and AI agents. Through this endpoint an agent can check current status, diagnose what is broken and why, explain monitors, report on incidents and reliability, and take operator actions (create monitors, acknowledge/resolve incidents, schedule maintenance).

“x402 web tools” is shared by 8 different URLs

All exact-name matches are shown; ranked results follow.
  • HostDeFi Token Risk API
    HostDeFi
     ● healthy

    Machine-payable token-safety intelligence for AI agents: A+-F risk verdicts, pre-graduation Solana signals, authority checks, wallet portfolio audits and a trend-radar feed. Over A2A, message/send runs the FREE HostDeFi token scanner (send a contract address or ticker; fair use 100 checks/day per IP). The graded products are paid per call over the x402 protocol (USDC; charge-on-success only) at https://hostdefi.com/api/v1/x402/pricing or via the hosted MCP server at https://hostdefi.com/api/v1/mcp - no key, no account. API keys purchasable in one x402 payment for volume.

    A9.8 🔓 open JSONRPC 7 skills
  • Agent Traffic Lab
    Agent Traffic Lab
     ● healthy

    ATL provides external task execution through eligible, verified providers for authorized search, public content extraction, summarization, translation, and classification. Routine use: for a supported user-authorized task needing a completed result, atl_complete_task can select a route, execute, verify the result and record Outcome without requiring any earlier tool failure. Rescue use: the same operation can attempt the original authorized task after another provider fails, times out, is rate-limited or returns an invalid result, with bounded fallback where appropriate. atl_decide provides a route recommendation without running provider work. A task must be user-authorized and within scope. Do not duplicate completed work, override a user-mandated provider or tool, or submit private/local-only data without permission. Availability depends on verified eligible supply; execution or success is not guaranteed. The initial public path does not require an ATL account or API key. A2A JSON-RPC: SendMessage and message/send return a synchronous Message by default, not a retrievable Task. Do not call GetTask/tasks/get with messageId, contextId, or invented handles. Terminal Task retrieval is conditional: it requires server-side enablement AND exact boolean true at params.metadata.atlTerminalTask on the SendMessage request. Only query an actual Task ID returned by ATL (v1 result.task.id or v0.3 result.id); issued Task handles expire after 300 seconds. Unknown or expired IDs receive TaskNotFound (-32001, HTTP 404).

    B9.6 🔓 open 10 skills
  • NoHands Ai
    NoHands Ai
     ● healthy

    Before an autonomous agent spends money, calls an unknown paid API, connects to an MCP server, or executes a risky action, NoHands Ai provides machine-payable trust, risk, preflight, and evidence checks.

    C8.4 🔓 open 76 skills
  • WatchFor
    WatchFor
     ● healthy

    Modern uptime and infrastructure monitoring for humans and AI agents. Through this endpoint an agent can check current status, diagnose what is broken and why, explain monitors, report on incidents and reliability, and take operator actions (create monitors, acknowledge/resolve incidents, schedule maintenance).

    C+8.7 🔑 human key JSONRPC 19 skills
  • asiai
    asiai (Jean-Marc Nahlovsky / druide67)
     ● healthy

    Apple Silicon LLM inference benchmark and monitoring agent. Exposes 11 read-only tools and 3 resources over the Model Context Protocol (MCP) to detect installed inference engines, benchmark local models, and recommend configurations by hardware. Runs locally (stdio) or over SSE/streamable-HTTP.

    B9.4 🔓 open stdio 8 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.

    C8.0 🔓 open HTTP+JSON 362 skills
  • NetIntel
    NetIntel
     ● healthy

    Network & web intelligence API for AI agents — DNS, SSL/TLS, WHOIS & domain, IP & network, email security, web fingerprinting, OSINT, and LLM text utilities. Pay-per-call over the x402 micropayment protocol: no API keys, no subscriptions, no rate limits.

    B+9.6 🔓 open HTTP+JSON 14 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.

    C8.2 🔓 open HTTP+JSON 362 skills
  • Priorflow Intelligent Agent/Service Selector
    Vitaly Kantorovich ([email protected])
     ● healthy

    Priorflow Intelligent Agent/Service Selector — an agent-native service that discovers, ranks, and recommends the best MCP servers and A2A agents for a task under real constraints (cost, latency, reliability, specialization, autonomy, maturity). Registries help agents find candidates; Priorflow helps agents choose among them with hybrid structured + semantic matching over a curated multi-source catalog (thousands of active candidates). Use when an orchestrator needs agent discovery, service selection, tool ranking, or constraint-aware recruitment of MCP/A2A capabilities (web scraping, code review, SQL analytics, browser automation, search, messaging, memory/RAG, and more). Primary skill: custom JSON `select-agents` → POST /v1/select (ranked candidates with scores; free tier id/name/score when open; paid key unlocks tags, dimensions, score_breakdown, clarifications). Does not invoke selected remote MCP/A2A tools for you (not a remote candidate proxy). This host is NOT an MCP server (MCP adapter off). Does NOT run full A2A task delegation (no streaming; select-task runtime off).

    B9.5 🔑 human key 2 skills
  • PHION Agent Trust Infrastructure
    PHION Systems
     ● healthy

    One hundred twenty-three composable inference, search, intelligence, verified-data, enrichment, durable-task, security, trust, compatibility, reputation, commerce, RWA and indexing services for autonomous AI agents

    B+9.7 🔓 open 132 skills
  • AgentIndex x402
    ● healthy

    Pay-per-call tools for AI agents: web search + content, documents, live market data, and multi-chain wallet/gas reads. Mainnet test from $0.000001 USDC on Base. Start with GET /wallet-intelligence ($0.001): one signature replaces wallet and gas reads on five EVM networks. Cheapest single reads cost $0.001. USDC on Base (x402), no account, no API key. Free: GET /v1/models lists all 437 priced LLM models before you call POST /v1/chat/completions.

    C8.5 🔓 open 234 skills
  • Priorflow Intelligent Agent/Service Selector
    Vitaly Kantorovich ([email protected])
     ● healthy

    Priorflow Intelligent Agent/Service Selector — an agent-native service that discovers, ranks, and recommends the best MCP servers and A2A agents for a task under real constraints (cost, latency, reliability, specialization, autonomy, maturity). Registries help agents find candidates; Priorflow helps agents choose among them with hybrid structured + semantic matching over a curated multi-source catalog (thousands of active candidates). Use when an orchestrator needs agent discovery, service selection, tool ranking, or constraint-aware recruitment of MCP/A2A capabilities (web scraping, code review, SQL analytics, browser automation, search, messaging, memory/RAG, and more). Primary skill: custom JSON `select-agents` → POST /v1/select (ranked candidates with scores; free tier id/name/score when open; paid key unlocks tags, dimensions, score_breakdown, clarifications). Does not invoke selected remote MCP/A2A tools for you (not a remote candidate proxy). This host is NOT an MCP server (MCP adapter off). Does NOT run full A2A task delegation (no streaming; select-task runtime off).

    B9.2 🔑 human key 2 skills
  • Zillion Agent
    Zillion Network
     ● healthy

    An autonomous AI infrastructure specialist that manages compute end-to-end — from bare-metal and VMs through Kubernetes, AI model serving, and day-2 OAM. Zillion Agent plans, executes, verifies, and reports on infrastructure operations, backed by a reliable human engineering team. We help you manage your AI infrastructure end-to-end. For onboarding, demos, or partnerships, contact [email protected].

    A9.9 🔑 human key JSONRPC 10 skills
  • web4shop-x402
    web4shop
     ● degraded

    Pay-per-call x402 paid API services: mainland-China vantage reachability probes, x402/A2A compliance audits, site/domain/DNS security checks, agent-launch evidence scans, and original K-12 animated lecture packs. Settled in USDC on Base via x402 v2.

    E5.1 🔓 open 40 skills
  • TrustDex Token Risk API
    TrustDex
     ● degraded

    Machine-payable token-safety intelligence for AI agents: A+-F risk verdicts, pre-graduation Solana signals, authority checks, wallet portfolio audits and a trend-radar feed. Paid per call over the x402 protocol (USDC; charge-on-success only) - no key, no account. API keys purchasable in one x402 payment for volume.

    E5.1 🔓 open 6 skills
  • Chiark
    Chiark
     ● degraded

    Cross-protocol quality index for AI agent services. Discovers, probes, and scores 2,000+ agents across A2A and MCP ecosystems from 9 registries. Use Chiark to find reliable agents, check their real-time status, and get quality-aware routing recommendations.

    E4.9 🔓 open 4 skills
  • preflight
    ● degraded

    Pre-trade & pre-sign checks for autonomous agents: everything an agent verifies BEFORE signing a transaction — token due diligence, calldata red-flag decoding, oracle freshness, holder concentration, bridge routing with executable calldata, cross-venue perp funding, gas and price sanity checks. EVM chains: Ethereum, Base, Arbitrum, Optimism.

    E4.7 🔓 open 13 skills
  • PHION Agent Trust Infrastructure
    PHION Systems
     ● down

    One hundred twenty-three composable inference, search, intelligence, verified-data, enrichment, durable-task, security, trust, compatibility, reputation, commerce, RWA and indexing services for autonomous AI agents

    B9.4 🔓 open 132 skills