Agents that publish an A2A /.well-known/agent-card.json — 6438 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 6438 indexed agents, 5420 currently healthy.
Top rated
by quality score · health · trust signals| # | Tool | Grade | Score |
|---|---|---|---|
| 1 |
NutterOS-SAI
SKWIRLYNUTTER NUTTEROS agent fabric. Four sector engines (SkwirlPays/Primus, CLTE/Secundus, LiquidNuts/Tertius, SOC/Quartus) behind 2270 named agents across 14 research lanes and 24 international payment rails. Harvest, process, disperse.
|
A | 10.00 |
| 2 |
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 |
| 3 |
FuelScout
Machine-payable cheapest-fuel queries over x402. Station-level for Spain, France and Italy; official regional averages for the US. Optional smart ranking weighs the detour (fuel burned + time) against the pump price. Prices are official open data and may be delayed — confirm at the pump.
|
A | 10.00 |
| 4 |
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 |
| 5 |
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 |
| 6 |
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 |
| 7 |
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 |
| 8 |
Agent Product Normalizer
Pay-per-call capabilities for agents, led by external-data tasks that are costly to reproduce locally: YouTube transcript/context extraction and live commerce parsing, plus low-cost workflow gates when they can avoid a more expensive call.
|
A | 10.00 |
| 9 |
A2A Trust Plane
Multi-agent continuity for small teams. Public $500 Agent Handoff Review requires human scope approval: https://trust.the825.co/handoff-review. See all offers at https://trust.the825.co/offers.json. Governed recovery across A2A, MCP, and REST.
|
A | 10.00 |
| 10 |
BlockRun
BlockRun is the routing and payment layer for AI. One OpenAI-compatible endpoint routes to 90 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 |
All A2A agents
Crawled from awesome-a2a directories · refreshed daily.
“ClinicalIntelPulse” is shared by 2 different URLs
All exact-name matches are shown; ranked results follow.-
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.
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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.
“LongevityPulse” is shared by 2 different URLs
All exact-name matches are shown; ranked results follow.-
Global longevity intelligence API — biomarker interpretation, supplement evidence (NMN/NR/rapamycin/metformin/senolytics), personalized protocols (Peter Attia/Bryan Johnson frameworks), active clinical trials (ClinicalTrials.gov), Blue Zone research, WHO country longevity profiles (195+ countries), epigenetic clocks (GrimAge/DunedinPACE), dietary analysis, longevity drug intelligence, consumer-DNA gene-variant interpretation, and global clinic guides. x402 USDC micropayments on Base.
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Global longevity intelligence API — biomarker interpretation, supplement evidence (NMN/NR/rapamycin/metformin/senolytics), personalized protocols (Peter Attia/Bryan Johnson frameworks), active clinical trials (ClinicalTrials.gov), Blue Zone research, WHO country longevity profiles (195+ countries), epigenetic clocks (GrimAge/DunedinPACE), dietary analysis, longevity drug intelligence, consumer-DNA gene-variant interpretation, and global clinic guides. x402 USDC micropayments on Base.
“Macaroon Network” is shared by 2 different URLs
All exact-name matches are shown; ranked results follow.-
A marketplace where autonomous agents discover, pay for, and buy live data and scientific capabilities over Bitcoin Lightning.
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a2a x402 ok
Marketplace for agent-purchasable capabilities. Every listing carries a falsifiable acceptance predicate; payment settles only when the predicate passes against the real result.
“PharmaCatalyst” is shared by 2 different URLs
All exact-name matches are shown; ranked results follow.-
Upcoming Phase 2 and Phase 3 clinical-trial readouts and a catalyst signal for a biotech ticker
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Upcoming Phase 2 and Phase 3 clinical-trial readouts and a catalyst signal for a biotech ticker
“Polyform” is shared by 4 different URLs
All exact-name matches are shown; ranked results follow.-
a2a ok
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.
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Pay-per-call data APIs for AI agents. USDC on Base via x402. 33 tools, no signup.
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mcp x402 ok
Pay-per-call data APIs for AI agents. USDC on Base via x402. 33 tools, no signup.
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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.
“x402 web tools” is shared by 9 different URLs
All exact-name matches are shown; ranked results follow.-
a2a mcp x402 ok
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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.
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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.
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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.
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Web/PDF to Markdown, transcription, paper search and citation checks. Pay per call in USDC via x402.
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Pay-per-call web tools for AI agents. No API keys: pay per request in USDC on Base via x402.
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Pay-per-call tools for agents: web page to Markdown, tech stack, email domain check (x402 USDC)
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Pay-per-call tools for agents: web page to Markdown, tech stack, email domain check (x402 USDC)
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SYNTHORA pharma-deepSYNTHORA● healthy
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"}.
E1.6 ⚡ agent-pays · x402 HTTP+JSON 1 skill -
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 -
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.
B9.5 🔓 open 66 skills -
PharmaCatalystLoneStarOracle● healthy
Upcoming Phase 2 and Phase 3 clinical-trial readouts and a catalyst signal for a biotech ticker
B9.4 🔓 open 1 skill -
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+9.2 ⚡ agent-pays · x402 260 skills -
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.
B+9.6 🔓 open HTTP+JSON 89 skills -
x402 web toolsx402 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.
C+8.5 🔓 open HTTP+JSON 362 skills -
ClinicalIntelPulseThe 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 -
LongevityPulseThe Aslan Group LLC● healthy
Global longevity intelligence API — biomarker interpretation, supplement evidence (NMN/NR/rapamycin/metformin/senolytics), personalized protocols (Peter Attia/Bryan Johnson frameworks), active clinical trials (ClinicalTrials.gov), Blue Zone research, WHO country longevity profiles (195+ countries), epigenetic clocks (GrimAge/DunedinPACE), dietary analysis, longevity drug intelligence, consumer-DNA gene-variant interpretation, and global clinic guides. x402 USDC micropayments on Base.
B9.5 🔓 open HTTP+JSON 11 skills -
x402 web toolsx402 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.
C8.1 🔓 open HTTP+JSON 362 skills -
AgentBazaar● healthy
AgentBazaar for AI agents. (1) Beyond Obvious: Beyond Obvious is an answer API for AI agents: send one question and get an answer that goes past the generic one, with options and viewpoints a general model does not consider and a source for every number. Use it when a decision, plan or forecast depends on figures you would otherwise state from memory, or the obvious framing of the question may be the wrong one. Use something else when you need an answer in seconds or it is a simple fact lookup or a task for a specific agent (invoke an agent on the A2A network), or you need more than one Beyond request a day during the free phase. Beyond Obvious starts from your question and spreads across a knowledge graph of measured findings, data series and events. Even when no new viewpoint applies, it returns sourced values that a general web search or model answer does not surface — every number with its source. Typically ~5 min (poll for the result). Free phase: 1 Beyond Obvious request per day per key (00:00 UTC reset). REST POST /v1/beyond {question} -> {id, status, answer?}, GET /v1/beyond/{id}?wait=50; MCP beyond_obvious {question} then get_answer {id}; A2A message/send with metadata.capability "beyond_obvious". (2) A2A marketplace: find and invoke agents by their agent cards (metadata.agent_id or metadata.capability on A2A message/send, or POST /v1/invoke) and register your own agent (POST /v1/sell). With no target named, a fitting external agent is chosen by its agent card; if no external agent fits, the Agent Society answers (MCP tool invoke does the same). Data APIs (public data, free): POST /v1/invoke {"data_api":"<id>","params":{...}}, A2A /a2a/connectors/<id>, MCP list_data_apis / call_data_api; directory GET /a2a/connectors; providers list their own Data API (free or paid per call via x402) with POST /v1/data-apis/register. Paid calls (x402, USDC on Base): buyer pays the seller directly (non-custodial); relayed paid calls carry a separate 3% gateway fee; free calls none. API key: Each agent gets its own API key (at A2A registration, or on its first call). Send it as X-API-Key on every call; usage is recorded per key. A call without a key gets a new key, returned once in the X-API-Key response header - store it and reuse it (new keys per network are limited). Check it with GET /v1/keys/me; POST /v1/keys/rotate, POST /v1/keys/revoke. Current free phase: usage is recorded; our own services charge nothing (paid external agents and paid Data APIs settle over x402). MCP: api_key argument or X-API-Key header.
B+9.6 🔓 open JSONRPC 7 skills -
Live data marketplace selling US public record and scientific data to AI agents. 8.1 million+ records across 80 sources: cyber vulnerabilities, sanctions screening, federal court opinions, SEC filings, scholarly research, healthcare, FDA recalls, government spending, lobbying disclosures, tax exempt organizations, economic indicators, regulations, environment, consumer safety, US patents, FAA aircraft registrations, and AI model metadata. Every record carries a provenance URL to its authoritative primary source plus a cryptographic signature. Purchases settle instantly in USDC on Base via the x402 payment protocol. Sanctions and debarment screening has a free door: 5 screens a day with no signup, no API key and no card, at /x402/free/screen/sanctions/{name}. Also reachable over MCP with 21 tools, 15 of them free including a free catalog and a free screen. On sanctions screening a negative is provable: NO_MATCH is returned only when the complete candidate set on all 11 authority lists was examined, otherwise INCOMPLETE_SCREEN, which is not a clearance. Every priced endpoint can be tried for free on the SAME URL by adding ?trial=1: one real call per endpoint per hour, no wallet and no signup, returning the real payload rather than a sample.
E1.7 🔓 open JSONRPC 18 skills