Agent Tools

Agents that publish an A2A /.well-known/agent-card.json — 5745 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 5745 indexed agents, 4819 currently healthy.

Agents indexed
5745 agents
4949 domains
public agent cards · +537 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)

“AnswerPool” is shared by 4 different URLs

All exact-name matches are shown; ranked results follow.
  • AnswerPool https://answerpool.io
    a2a ok

    Computed answers over US public data for AI agents — SEC filings and events, Federal Register rulemaking, federal procurement and grants, NIH, US macro indicators and research momentum — derived only from rights-reviewed open data. Most identifier lookups, glossaries and feeds are free with no key;…

  • AnswerPool https://answerpool.io/mcp
    a2a mcp ok

    Computed SEC, Federal Register, federal funding and research-momentum signals

    mcp listing a2a listing
  • AnswerPool https://answerpool.io/v1/sec/company
    mcp x402 ok

    Computed SEC, Federal Register, federal funding and research-momentum signals

  • AnswerPool https://server.smithery.ai/answerpool/answerpool/mcp
    mcp ok

    Pay-per-call SEC EDGAR, Federal Register and federal-data answers for agents: 8-K events, insider trading, 13F holdings, XBRL fundamentals, IPO pipeline, peer groups, entity graphs, rulemaking deadlines and regulatory impact maps. Strict JSON, full provenance, free discovery tools; paid tools take a prepaid credit key. free samples at answerpool.io/v1/samples.

“BizIntel API” is shared by 2 different URLs

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

“ClinicalIntelPulse” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • ClinicalIntelPulse https://clinicalintelpulse.theaslangroupllc.com
    a2a ok

    The medical intelligence layer for AI agents. Consumer lane: plain-language drug info, drug-drug interaction screening, and recall checks from FDA-approved labels (drug-check, interaction-check, recall-check). Institutional lane: pharmaceutical pipeline and clinical-trial intelligence from 400,000+ ClinicalTrials.gov studies, FDA OpenFDA, and PubMed. 13 endpoints, from $0.10. Pay-per-query via x402 micropayments on Base.

  • ClinicalIntelPulse https://clinicalintelpulse.theaslangroupllc.com/api/clinical/pipeline-scan
    x402 ok

    The medical intelligence layer for AI agents. Consumer lane: plain-language drug info, drug-drug interaction screening, and recall checks from FDA-approved labels (drug-check, interaction-check, recall-check). Institutional lane: pharmaceutical pipeline and clinical-trial intelligence from 400,000+ ClinicalTrials.gov studies, FDA OpenFDA, and PubMed. 13 endpoints, from $0.10. Pay-per-query via x402 micropayments on Base.

“Macaroon Network” is shared by 2 different URLs

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

“openFDA Drug Safety” is shared by 3 different URLs

All exact-name matches are shown; ranked results follow.
  • openFDA Drug Safety /drug-safety
    a2a ok

    Medication safety check: the safe-to-use check for AI agents before administering or recommending a drug. Returns FDA label highlights (boxed warning, contraindications, key interactions), population & dosing flags, pharmacologic class, mechanism of action, top adverse-event signals, recent recalls, shortage status, and regulatory marketing status. Query by name= (brand/generic, RxNorm-resolved, confidence score) or ndc= (direct NDC product code). Add ?verbose=1 for full-text label sections. Data: openFDA (CC0).

  • openFDA Drug Safety https://openfda-drug-safety.xplowdiaka.workers.dev
    x402 ok

    Pay-per-call FDA drug safety profiles for AI agents: label highlights (boxed warning, contraindications, interactions), pregnancy/pediatric/geriatric flags, top adverse-event signals, recent recalls, and shortage & marketing/discontinued status — all in one call. RxNorm-normalized drug-name resolution with a match confidence score. $0.04 USDC on Base via Coinbase CDP facilitator, no API key, no account. Data: openFDA (CC0).

  • openFDA Drug Safety https://openfda-drug-safety.xplowdiaka.workers.dev/drug-safety
    x402 ok

“Pet Data Station” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • Pet Data Station https://petforai.com
    a2a ok

    AI-crawler-friendly pet regulatory & health data API. Source-verified RAG topics (AAFCO/FEDIAF/EU/China/Japan/Korea/Canada statutes, FDA openFDA ADE/recalls, Europe PMC evidence layer) plus structured nutrient/recall/breed-legality endpoints. No registration, no API key, English-only responses. Free.

  • Pet Data Station https://petforai.com/mcp/
    mcp ok

    Source-verified pet food regulations, recalls, nutrient standards and species care data.

“Polyform” is shared by 4 different URLs

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

“RecallScout” is shared by 3 different URLs

All exact-name matches are shown; ranked results follow.
  • RecallScout https://recallscout.salesup.workers.dev/mcp
    mcp ok

    US vehicle, car-seat, product and food recalls, VIN decoding and crash ratings (NHTSA, CPSC, FDA).

  • RecallScout https://recallscout.scalpstream.com/a2a
    a2a ok

    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.

  • RecallScout https://recallscout.scalpstream.com/recalls
    x402 ok

    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.

“x402 web tools” is shared by 8 different URLs

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

“x402-endpoints” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • x402-endpoints https://server.smithery.ai/digitalweb33333/x402-endpoints/mcp
    mcp ok

    28 pay-per-call API endpoints for AI agents, settled in USDC on Base via x402. Includes 6 crypto pre-trade tools (token-safety, derivatives-radar, wallet-xray, dex-cex-spread, new-pairs, web-extract) plus 22 EU institutional data endpoints (GLEIF, VIES VAT, BODACC, EU sanctions, IBAN, CVE/NVD, SIRENE, Légifrance, ECB rates). No API keys, no subscription — pay per request.

  • x402-endpoints https://x402-endpoints.onrender.com
    a2a ok

    Paid x402 API tools for AI agents (USDC on Base). Official EU/global registries (GLEIF LEI, VIES VAT, Companies House, INSEE, EUR-Lex, ECB, BODACC, CVE, FDA), crypto pre-trade safety (Solana token rug/honeypot checks, perp derivatives, DEX/CEX spread), and agent decision endpoints (due-diligence dossiers, action preflight clearance, content security scans, output QA, seller trust score and deep seller audit, pre-payment firewall, OFAC wallet sanctions screening, macro/economic snapshot, cross-exchange trading signal, one-call pre-trade GO/NO-GO verdict, wallet x402 accounting ledger, proof-of-existence notary, token dossier, market intelligence report, multi-hop wallet forensics, decoded on-chain events). Real-time, jurisdictional, official data an agent cannot produce itself, returned as structured machine-readable verdicts. No API key, no account: payment is authentication.

  • Macaroon Network
    ● healthy

    Marketplace for agent-purchasable capabilities. Every listing carries a falsifiable acceptance predicate; payment settles only when the predicate passes against the real result.

    C+8.9 🔓 open JSONRPC 79 skills
  • RecallScout
    RecallScout
     ● healthy

    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.

    B+9.8 🔓 open 3 skills
  • Polyform
    ● healthy

    Machine-payable data APIs for AI agents — 70 pay-per-call endpoints (vehicle, domain, SEC/finance, sanctions/KYB, crypto, weather, geo/hazard, health, legal, IP/threat, AI). USDC on Base via x402. No account, no API key.

    B+9.7 🔓 open 66 skills
  • Polyform
    ● healthy

    Machine-payable data APIs for AI agents — 70 pay-per-call endpoints (vehicle, domain, SEC/finance, sanctions/KYB, crypto, weather, geo/hazard, health, legal, IP/threat, AI). USDC on Base via x402. No account, no API key.

    B9.6 🔓 open 66 skills
  • Pet Data Station
    Pet Data Station
     ● healthy

    AI-crawler-friendly pet regulatory & health data API. Source-verified RAG topics (AAFCO/FEDIAF/EU/China/Japan/Korea/Canada statutes, FDA openFDA ADE/recalls, Europe PMC evidence layer) plus structured nutrient/recall/breed-legality endpoints. No registration, no API key, English-only responses. Free.

    C+8.5 🔓 open 3 skills
  • x402-endpoints
    x402-endpoints
     ● healthy

    Paid x402 API tools for AI agents (USDC on Base). Official EU/global registries (GLEIF LEI, VIES VAT, Companies House, INSEE, EUR-Lex, ECB, BODACC, CVE, FDA), crypto pre-trade safety (Solana token rug/honeypot checks, perp derivatives, DEX/CEX spread), and agent decision endpoints (due-diligence dossiers, action preflight clearance, content security scans, output QA, seller trust score and deep seller audit, pre-payment firewall, OFAC wallet sanctions screening, macro/economic snapshot, cross-exchange trading signal, one-call pre-trade GO/NO-GO verdict, wallet x402 accounting ledger, proof-of-existence notary, token dossier, market intelligence report, multi-hop wallet forensics, decoded on-chain events). Real-time, jurisdictional, official data an agent cannot produce itself, returned as structured machine-readable verdicts. No API key, no account: payment is authentication.

    B9.4 🔓 open JSONRPC 52 skills
  • AgentDataHub (agentdatum.com)
    C哥 x Strategy001 Engine
     ● healthy

    AgentDataHub - pay-per-call data marketplace for AI agents. 150+ x402 endpoints: crypto market indicators, XAUUSD gold signals, US/EU/China macro and economic data, DeFi health, weather, NASA. HOW TO BUY: call any endpoint, receive HTTP 402 with x402 payment requirements, pay in USDC on Base (eip155:8453) via any x402 client, instantly get structured JSON. No API key, no signup. Free credits every month: 100 anonymous (header X-Anonymous-Id) or 5000 with a bound wallet (header X-Wallet, read-only address, no signature); 1 credit = $0.001. Prices from $0.001 per call - Glassnode-grade data at 1 cent vs $999/month elsewhere.

    C+9.0 ⚡ agent-pays · x402 260 skills
  • ScriptMasterLabs mcp-x402 Data Node
    Script Master Labs LLC
     ● healthy

    Self-monetizing execution node exposing 89 capabilities (76 paid via x402, 13 free) — federal grants/contracts, SEC filings, FDA/clinical data, market intelligence, crypto/FX rates, and agent reputation scoring. Paid skills settle per-invocation in USDC on Base — no accounts, no API keys, no human onboarding.

    B9.4 🔓 open HTTP+JSON 89 skills
  • AnswerPool
    AutoCortex LLC
     ● healthy

    Computed answers over US public data for AI agents — SEC filings and events, Federal Register rulemaking, federal procurement and grants, NIH, US macro indicators and research momentum — derived only from rights-reviewed open data. Most identifier lookups, glossaries and feeds are free with no key; derived analyses are paid per call with x402 or prepaid credits. Strict JSON with public provenance.

    B9.4 ⚡ agent-pays · x402 140 skills
  • Truth Bear — Cross-Line Cascade & Leading Signals for AI Agents (GAUGE engine)
    Truth Bear
     ● healthy

    Pay-per-call signals for AI agents via x402 (USDC on Base, no API key). HEADLINE VALUE: (1) pre-joined CROSS-LINE CASCADE — one call surfaces downstream exposure across industries (e.g. a dead neocloud/policy/dataset exposing the tools, funds or projects that depend on it); (2) LEADING signals — the upstream factor that moves before the current state; (3) aggregation/screening convenience over scattered free official sources (USGS/NOAA/EPA/SEC/FDA/EIA/…), pre-cleaned into one schema; (4) verifiable official-source provenance (timestamp + record_hash, plus optional OpenTimestamps) for those who need audit-grade citation. Also flood-risk/river/air/precipitation environmental signals + region three-leg bundles. Pure description, no judgment/prediction. Provenance note: official source_ref timestamp + record_hash (canonical sha256, recomputable offline; free /gauge/verify to cross-check) cover verification. Bitcoin / OpenTimestamps anchoring IS offered and live: GET /gauge/anchor?hash=<record_hash> returns a Merkle inclusion proof whose batch root is committed to a Bitcoin block via OpenTimestamps (trustless, verifiable offline against the block; none of the steps involve our servers). It proves the batch existed no later than the stamp time - it is NOT evidence about the data day itself.

    C+8.7 🔓 open 42 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
  • ClinicalIntelPulse
    The Aslan Group LLC
     ● healthy

    The medical intelligence layer for AI agents. Consumer lane: plain-language drug info, drug-drug interaction screening, and recall checks from FDA-approved labels (drug-check, interaction-check, recall-check). Institutional lane: pharmaceutical pipeline and clinical-trial intelligence from 400,000+ ClinicalTrials.gov studies, FDA OpenFDA, and PubMed. 13 endpoints, from $0.10. Pay-per-query via x402 micropayments on Base.

    A9.8 🔓 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
  • BizIntel API
    BizIntel API
     ● healthy

    Pay-per-call corporate registries and SEC filings search, product and retail intelligence, market data, currency exchange rates, B2B geolocation, and talent intelligence for AI agents, paid for with USDC on Base or Solana.

    A9.9 ⚡ agent-pays · x402 50 skills
  • openFDA Drug Safety
    ● healthy

    Medication safety check: the safe-to-use check for AI agents before administering or recommending a drug. Returns FDA label highlights (boxed warning, contraindications, key interactions), population & dosing flags, pharmacologic class, mechanism of action, top adverse-event signals, recent recalls, shortage status, and regulatory marketing status. Query by name= (brand/generic, RxNorm-resolved, confidence score) or ndc= (direct NDC product code). Add ?verbose=1 for full-text label sections. Data: openFDA (CC0).

    D6.4 🔓 open
  • SYNTHORA pharma-deep
    SYNTHORA
     ● down

    SYNTHORA pharma-deep: deep pharmaceutical intelligence report on a drug / active ingredient / manufacturer using OPEN official sources (openFDA label, FAERS adverse events aggregated, FDA recalls/enforcement, NDC catalog, ClinicalTrials.gov v2, Europe PMC literature, EMBL-EBI ChEMBL, NIH RxNav, NLM DailyMed, Spanish AEMPS CIMA, WHO GHO) plus web search, synthesized by the SYNTHORA intelligence engine into a signed report with mandatory citations per claim and an explicit NO VERIFICABLE section. Regulatory status US (FDA) and Spain/EU (AEMPS). 0.50 USDC via x402 on Base. POST {"subject":"metformina"}.

    C+9.1 ⚡ agent-pays · x402 HTTP+JSON 1 skill
  • Regulatory Compliance Intelligence MCP
    FoundryNet
     ● down

    Track regulations, final rules, comment deadlines, recalls, and enforcement actions — live from the Federal Register, openFDA, and CPSC.

    E0.9 🔓 open