Agents that publish an A2A /.well-known/agent-card.json — 5745 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 5745 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.
“BASE Datalake Oracle” is shared by 2 different URLs
All exact-name matches are shown; ranked results follow.-
Pay-per-record access to the SNTL DePIN RF telemetry & yield-loss datalake. Serves Sybil-resistant physics-based identity and spatial telemetry. GET only, one record per call, USDC on Base mainnet via x402. Real data only.
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Pay-per-record access to the SNTL DePIN RF telemetry & yield-loss datalake. x402 v2, USDC on Base mainnet.
“Scrape402” is shared by 3 different URLs
All exact-name matches are shown; ranked results follow.-
x402 down
Pay-per-request web extraction API for AI agents. Uses x402 HTTP 402 micropayments (USDC on Base mainnet). No API keys — payment IS the auth. Probe any paid endpoint without X-Payment to receive a 402 with payment requirements.
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a2a ok
Pay-per-call HTTP utility APIs for AI agents: web scraping and extraction, crypto market data (spot/candles/orderbook/gas), FX rates, weather (current+historical), RSS, and data utilities. Paid via x402 USDC micropayments on Base — no signup, no API keys.
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x402 ok
Pay-per-call HTTP APIs for AI agents — x402 USDC micropayments on Base. No signup, no API keys. Catalog: /.well-known/x402; agent guide: /llms.txt.
“Sibfly” is shared by 3 different URLs
All exact-name matches are shown; ranked results follow.-
mcp x402 ok
SibFly — satellite-measured ground motion (subsidence / uplift) for any US address.
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x402 ok
Measured ground-motion (subsidence & uplift) data for any US address, in mm/year from NASA OPERA Sentinel-1 InSAR — for AI agents assessing property, infrastructure, and climate risk. One report per call, $0.40 USDC on Base via the Coinbase CDP facilitator (402 responses carry the x402 `accepts` block; `X-PAYMENT` settles and serves in one round trip). Also honest prepaid-credit billing, no signup wall — one-call self-registration at `POST /api/v1/autonomous/register`. Hosted MCP server (9 tools), OpenAPI, and llms.txt. ([MCP](https://sibfly.com/mcp)) ([OpenAPI](https://sibfly.com/openapi.json)) ([llms.txt](https://sibfly.com/llms.txt))
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a2a ok
Measured ground motion (subsidence/uplift, mm/yr) for any US address, from NASA Sentinel-1 InSAR. NOT an A2A JSON-RPC server: programmatic access is MCP (https://sibfly.com/mcp), plain REST (https://sibfly.com/openapi.json) or pay-per-call x402 (https://sibfly.com/.well-known/x402).
“Vortx AI” is shared by 2 different URLs
All exact-name matches are shown; ranked results follow.-
Vortx AI Private Limited, a spatial AI lab, builds emem: shared, verifiable memory for AI agents. Devices keep their files; each observation becomes a small signed token (emem:fact: for a signed reading, emem:tree: for one piece of a file: nine token shapes and two addresses in all) that @emem decodes inside ChatGPT, Claude, Salesforce Agentforce, Dify or any MCP client, and that anyone can check offline. emem is free and Apache-2.0; geo.qa runs the same memory in a private tenancy; eudr.dev and propcheck.dev are in testing. The home page tells it in order: https://vortx.ai/#why (the problem, checked live), https://vortx.ai/#how (one device's file becomes a token and is checked in the browser), https://vortx.ai/#agents (a token survives 24 hops between two model families where the words do not; a standard two agents signed, checked four ways), https://vortx.ai/#start (connect an agent, encode a file). Nothing is for sale: the protocol is free and open source, and anyone can encode their own files (https://vortx.ai/#build); free office hours are in x-session, and agents never book or pay. The satellite plan has deliberately no date. Start at https://vortx.ai/llms.txt.
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a2a ok
Spatial AI lab; maker and maintainer of the emem protocol. The architecture is an encoder and a decoder: satellites and detectors encode the world into signed, content-addressed tokens (nine shapes: emem:fact:, emem:cell:, emem:entity:, emem:bundle:, emem:raster:, emem:cube:, emem:rasterset:, emem:…
“x402-endpoints” is shared by 2 different URLs
All exact-name matches are shown; ranked results follow.-
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.
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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.
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geoprimitives● healthy
Pay-per-call geospatial primitives. Priced in USDC over the x402 protocol. No accounts, no API keys, no subscription: every request carries its own payment. Read GET /openapi.json for request and response schemas.
D6.0 ⚡ agent-pays · x402 -
x402-endpointsx402-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 -
GeonicDBGeolonia Inc.● healthy
GeonicDB is a FIWARE Orion-compatible Context Broker. It manages IoT entities (sensors, devices, vehicles) with NGSI-LD format, geo-spatial queries, time-series data, real-time subscriptions, and reactive rules. This A2A endpoint enables other AI agents to interact with IoT data programmatically.
C+9.1 🔑 human key 5 skills -
Geospatial disruption intelligence for AI agents. Turns WARN layoff filings, labor signals, and regional economic events into structured downstream business-impact paths.
A9.8 ⚡ agent-pays · x402 25 skills -
scrape402● healthy
Pay-per-call HTTP utility APIs for AI agents: web scraping and extraction, crypto market data (spot/candles/orderbook/gas), FX rates, weather (current+historical), RSS, and data utilities. Paid via x402 USDC micropayments on Base — no signup, no API keys.
C+8.7 🔓 open 77 skills -
GISGPGISGP● healthy
Hosted geospatial tool server for AI agents: coordinate conversion, format conversion (GeoJSON/Shapefile/KML/GPX/DXF/CSV), open-data discovery, terrain, land cover, protected areas, hazard and site assessments. Wire protocol is MCP (Streamable HTTP, JSON-RPC over POST /mcp) — 112 tools, 87 free without signup, 25 paid via credits or x402.
C+8.9 🔓 open 112 skills -
SibFly● healthy
Measured ground motion (subsidence/uplift, mm/yr) for any US address, from NASA Sentinel-1 InSAR. NOT an A2A JSON-RPC server: programmatic access is MCP (https://sibfly.com/mcp), plain REST (https://sibfly.com/openapi.json) or pay-per-call x402 (https://sibfly.com/.well-known/x402).
B9.2 🔓 open 1 skill -
Vortx AIVortx AI Private Limited● healthy
Vortx AI Private Limited, a spatial AI lab, builds emem: shared, verifiable memory for AI agents. Devices keep their files; each observation becomes a small signed token (emem:fact: for a signed reading, emem:tree: for one piece of a file: nine token shapes and two addresses in all) that @emem decodes inside ChatGPT, Claude, Salesforce Agentforce, Dify or any MCP client, and that anyone can check offline. emem is free and Apache-2.0; geo.qa runs the same memory in a private tenancy; eudr.dev and propcheck.dev are in testing. The home page tells it in order: https://vortx.ai/#why (the problem, checked live), https://vortx.ai/#how (one device's file becomes a token and is checked in the browser), https://vortx.ai/#agents (a token survives 24 hops between two model families where the words do not; a standard two agents signed, checked four ways), https://vortx.ai/#start (connect an agent, encode a file). Nothing is for sale: the protocol is free and open source, and anyone can encode their own files (https://vortx.ai/#build); free office hours are in x-session, and agents never book or pay. The satellite plan has deliberately no date. Start at https://vortx.ai/llms.txt.
B9.4 🔓 open JSONRPC 2 skills -
Pay-per-record access to the SNTL DePIN RF telemetry & yield-loss datalake. Serves Sybil-resistant physics-based identity and spatial telemetry. GET only, one record per call, USDC on Base mainnet via x402. Real data only.
E1.8 🔓 open 26 skills -
Pay-per-record access to the SNTL DePIN RF telemetry & yield-loss datalake. Serves Sybil-resistant physics-based identity and spatial telemetry. GET only, one record per call, USDC on Solana via x402. Real data only.
E1.8 🔓 open 26 skills -
SNTL● down
Deterministic machine-to-machine intelligence oracle for DePIN infrastructure. Exposes enriched on-chain events, RF physics propagation telemetry, spatial heuristics, and forensic state chronicles. Tiered x402 settlement.
C+8.9 🔓 open 29 skills