Agent Tools

Agents that publish an A2A /.well-known/agent-card.json — 5744 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 5744 indexed agents, 4819 currently healthy.

Agents indexed
5744 agents
4948 domains
public agent cards · +536 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)

“Agentic Security Shield” is shared by 2 different URLs

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

“AgentIndex x402” is shared by 4 different URLs

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

“Jurk Shenzhen Sourcing & Human Execution” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • Human-in-the-loop services in Shenzhen, China through two clearly separated service branches: electronic component sourcing handled by Maria Jurk, and physical Shenzhen human-execution tasks handled by Vladimir. Requests may be submitted by people or AI agents. No real-time inventory, price, authen…

  • Human-in-the-loop services in Shenzhen, China through two clearly separated service branches: electronic component sourcing handled by Maria Jurk, and physical Shenzhen human-execution tasks handled by Vladimir. Requests may be submitted by people or AI agents. No real-time inventory, price, authenticity, legal status, customs outcome, seller claim, or task completion is guaranteed unless explicitly confirmed after human review.

“market.561.group” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • Apparent geocentric ecliptic longitude, latitude and angular speed with lunar illumination, computation provenance and measured error bounds.

  • 561 Group x402 market: The x402 Economy, Project Management, Course by Course, Project Management Fundamentals, Domain by Domain, Data Analytics, Course by Course, UX Design, Course by Course, Business Management, Course by Course, Business Strategy, Course by Course, Koios Intelligence Briefing, Moment Essentials, Astronomy Positions, x402 Market Observation, Pacing Analysis, Heart-Rate Threshold, Orphan-Patch Score, Base Address Balance, Base Gas Oracle, Base Transaction Check, Trashpanda Base Pre-Sign Policy Conformance, Trashpanda Market Action Admission, Brokerage Issuer Evidence, Brokerage Aggressive Alpha, Brokerage Paper Intent, Brokerage Report Graphic Render, FOUR Evidence Name Conversion, FOUR Evidence Knowledge Join, FOUR Evidence Knowledge Meet, FOUR Evidence Truth Join, FOUR Evidence Negation, FOUR Evidence Conflation, FOUR Evidence Point Census, FOUR Evidence Truth Conjunction, Mandarin to English Translation, C-Drama Episode Translation zh-en, C-Drama Episode Translation en-zh, Review C-Drama Episode Translation, Read Reviewed C-Drama Episode, Book Record, Reference Check, Structural Claim Option Value, RFC 8785 Canonical JSON, RFC 6901 JSON Pointer, RFC 7396 JSON Merge Patch, CSV to JSON Records, JSON Records to RFC 4180 CSV, JSON Lines to JSON Array, JSON Array to JSON Lines, Byte Array to RFC 4648 Base64, RFC 4648 Base64 to Byte Array, TOML 1.1 Validation and Diagnostics, TOML 1.1 to JSON, JSON to TOML 1.1, YAML Syntax and Alias Diagnostics, YAML to JSON, JSON to YAML 1.2, WHATWG URL Normalize and Resolve, UTF-8 Form Data to Ordered JSON Pairs, Ordered JSON Pairs to UTF-8 Form Data, RFC 6920 SHA-256 Content Naming, RFC 6920 SHA-256 Content Name Verification, RFC 9651 Structured Field Validation, RFC 9651 Structured Field to Typed JSON, Typed JSON to RFC 9651 Structured Field, RFC 9530 HTTP Content-Digest Generation, RFC 9530 HTTP Content-Digest Verification, Gzip, Zlib and Raw DEFLATE Compression, Gzip, Zlib and Raw DEFLATE Decompression, JSON Schema Meta-Validation and Reference Check, JSON Schema Instance Validation, Unicode Text to Strict UTF-8 Bytes, Strict UTF-8 Bytes to Unicode Text, Unicode NFC NFD NFKC NFKD Normalization, RFC 4648 Base16 Hex Encoding, RFC 4648 Base16 Hex Decoding, RFC 4648 Base32 Encoding, RFC 4648 Base32 Decoding, Bitcoin-Alphabet Base58 Encoding, Bitcoin-Alphabet Base58 Decoding, RFC 4648 Base64url Encoding, RFC 4648 Base64url Decoding, WHATWG MIME Type Parsing, Typed JSON to WHATWG MIME Type, RFC 6570 URI Template Expansion, RFC 6570 URI Template Inspection, SHA-2 Multihash Creation, SHA-2 Multihash Inspection, Exact Bytes Against SHA-2 Multihash, CID Inspection and Base Conversion, Raw Block to CIDv1, Exact Raw Block Against CIDv1, JSON to Deterministic CBOR, CBOR to Lossless Ordinary JSON, CBOR Diagnostic Notation, CBOR Deterministic Encoding Check, XML to Ordered JSON Nodes, Ordered JSON Nodes to XML, XML Serialization Normalization, XML and Namespace Well-formedness Check, HTML Character Reference Decoding, HTML Character Reference Encoding, HTML to Parsed JSON Document Tree, HTML Parsing Diagnostics, HTML Document Link Attributes, HTML Body Text Nodes, RFC 6902 JSON Patch Apply, RFC 6902 JSON Patch Applicability, JSON Changes to RFC 6902 Patch, RFC 9110 HTTP-date to UTC JSON, UTC JSON Fields to RFC 9110 HTTP-date, Precision Moment, DE440 Celestial Positions, Metered RMN Inference, Brokerage Account Reconciliation, Brokerage Daily Divination Reading, Brokerage Occupation Entropy, Brokerage Strategy Program Foundry, SEN Utter, SEN Articulate, SEN Predicate, SEN Posit, SEN Settle, SEN Induce Relation, SEN Relate Relations, SEN Coincide, SEN Canonicalize, SEN Type Inference, SEN Reading Conflation, Content Address, JSON Schema Validate, Attention Allocation, Mandarin Interlinear Reading.

“OpenFab” is shared by 2 different URLs

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

“PCB Fabrication Engineer” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • Apply structural edits (move/rotate footprints, resize a net's track width, add a mounting hole, edit a field, swap a footprint) to a KiCad 8/9 project, run electrical and design-rule checks under a named fabrication profile, and return a scoped pass/fail report plus downloadable Gerber X2/Excellon, BOM, position file, PDF, and preview artifacts. Claims are scoped: ERC/DRC clean under the listed profile rules, never "DFM approved"; footprint swaps are checked structurally, never electrically.. $0.25 per call, settled in USDC on Base mainnet over HTTP 402. No API keys, no accounts.

  • Apply structural edits (move/rotate footprints, resize a net's track width, add a mounting hole, edit a field, swap a footprint) to a KiCad 8/9 project, run electrical and design-rule checks under a named fabrication profile, and return a scoped pass/fail report plus downloadable Gerber X2/Excellon, BOM, position file, PDF, and preview artifacts. Claims are scoped: ERC/DRC clean under the listed profile rules, never "DFM approved"; footprint swaps are checked structurally, never electrically.. $0.25 per call, settled in USDC on Base mainnet over HTTP 402. No API keys, no accounts.

“Radar CNPJ” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • Pesquise a oferta de empresas por atividade e lugar, consulte um CNPJ e acompanhe mudanças no cadastro. Dados da Receita, com o recorte e os limites à vista.

  • Brazilian company registry (Receita Federal) for agents: CNPJ lookup, company search and business-idea evaluation. Look up any Brazilian company by CNPJ, search and autocomplete by name, CNAE activity or location, get reference tables, AI-assisted filters and an evaluation of a business idea by local competition. Tool descriptions in English. Free MCP with a daily fair-use limit (429 with resets_at, no charges).

“RoboParts” is shared by 2 different URLs

All exact-name matches are shown; ranked results follow.
  • 厂商中立的机器人零部件兼容性数据层。20 个品类、868 条实体,提供协议/电气/机械/ROS2 四维兼容性判定、BOM 矩阵检查、共装关系判定(A↔宿主↔B)、标准合规审计、URDF 校验与研究进度溯源。**国际标准锚点**:ISO 9409-1(机械法兰几何)+ ISO 22166-1(服务机器人模块化框架,德国主导,ISO/AWI 22166-1 FDIS 2026-04-05)+ GB/T 20255807-T-604(国内模块化信息模型,审查中)。既不生产也不转售任何零部件,兼容性结论基于厂商公开声明字段的规则推断,未声明维度显式标为 unknown。

  • **RoboParts** — Vendor-neutral robot parts compatibility data layer **852 entities across 20 categories** (grippers, reducers, flanges, motors, cables, sensors, etc.) with 4-dimensional compatibility checks: protocol / electrical / mechanical / ROS2. **11 MCP tools**, including `lint_urdf` — a URDF static compatibility linter (a rare capability in the MCP ecosystem). Read-only, no auth required. Data sources: manufacturer datasheets, ISO 9409-1 standard, open-source BOMs. Not a marketplace — we neither manufacture nor resell parts. 🔗 https://roboparts.cc 📚 https://roboparts.cc/mcp-guide 📦 https://github.com/lm203688/roboparts

  • Flutter and Dart utility API for mobile agents and operators: pubspec parsing, pub.dev package lookups, Flutter APK detection, dependency checks, Dart formatting, project static analysis, ARB localization validation, and controlled APK builds from uploaded project ZIPs. URL downloads enforce SSRF protections. ZIP uploads enforce size and zip-bomb limits.

    E6.0 ⚡ agent-pays · x402
  • Answers informational questions about Sibe cloud CAD management and SolidWorks workflows using public website resources.

    B9.3 🔓 open 1 skill
  • OpenFab
    ● healthy

    Instant, non-binding cost and lead-time estimates for custom manufacturing: CNC machining, injection molding, sheet metal, laser cutting, metal stamping, 3D printing, urethane casting, PCB fabrication. Estimates only - no orders.

    B+9.6 🔓 open 7 skills
  • 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
  • 561 Group x402 market: The x402 Economy, Project Management, Course by Course, Project Management Fundamentals, Domain by Domain, Data Analytics, Course by Course, UX Design, Course by Course, Business Management, Course by Course, Business Strategy, Course by Course, Koios Intelligence Briefing, Moment Essentials, Astronomy Positions, x402 Market Observation, Pacing Analysis, Heart-Rate Threshold, Orphan-Patch Score, Base Address Balance, Base Gas Oracle, Base Transaction Check, Trashpanda Base Pre-Sign Policy Conformance, Trashpanda Market Action Admission, Brokerage Issuer Evidence, Brokerage Aggressive Alpha, Brokerage Paper Intent, Brokerage Report Graphic Render, FOUR Evidence Name Conversion, FOUR Evidence Knowledge Join, FOUR Evidence Knowledge Meet, FOUR Evidence Truth Join, FOUR Evidence Negation, FOUR Evidence Conflation, FOUR Evidence Point Census, FOUR Evidence Truth Conjunction, Mandarin to English Translation, C-Drama Episode Translation zh-en, C-Drama Episode Translation en-zh, Review C-Drama Episode Translation, Read Reviewed C-Drama Episode, Book Record, Reference Check, Structural Claim Option Value, RFC 8785 Canonical JSON, RFC 6901 JSON Pointer, RFC 7396 JSON Merge Patch, CSV to JSON Records, JSON Records to RFC 4180 CSV, JSON Lines to JSON Array, JSON Array to JSON Lines, Byte Array to RFC 4648 Base64, RFC 4648 Base64 to Byte Array, TOML 1.1 Validation and Diagnostics, TOML 1.1 to JSON, JSON to TOML 1.1, YAML Syntax and Alias Diagnostics, YAML to JSON, JSON to YAML 1.2, WHATWG URL Normalize and Resolve, UTF-8 Form Data to Ordered JSON Pairs, Ordered JSON Pairs to UTF-8 Form Data, RFC 6920 SHA-256 Content Naming, RFC 6920 SHA-256 Content Name Verification, RFC 9651 Structured Field Validation, RFC 9651 Structured Field to Typed JSON, Typed JSON to RFC 9651 Structured Field, RFC 9530 HTTP Content-Digest Generation, RFC 9530 HTTP Content-Digest Verification, Gzip, Zlib and Raw DEFLATE Compression, Gzip, Zlib and Raw DEFLATE Decompression, JSON Schema Meta-Validation and Reference Check, JSON Schema Instance Validation, Unicode Text to Strict UTF-8 Bytes, Strict UTF-8 Bytes to Unicode Text, Unicode NFC NFD NFKC NFKD Normalization, RFC 4648 Base16 Hex Encoding, RFC 4648 Base16 Hex Decoding, RFC 4648 Base32 Encoding, RFC 4648 Base32 Decoding, Bitcoin-Alphabet Base58 Encoding, Bitcoin-Alphabet Base58 Decoding, RFC 4648 Base64url Encoding, RFC 4648 Base64url Decoding, WHATWG MIME Type Parsing, Typed JSON to WHATWG MIME Type, RFC 6570 URI Template Expansion, RFC 6570 URI Template Inspection, SHA-2 Multihash Creation, SHA-2 Multihash Inspection, Exact Bytes Against SHA-2 Multihash, CID Inspection and Base Conversion, Raw Block to CIDv1, Exact Raw Block Against CIDv1, JSON to Deterministic CBOR, CBOR to Lossless Ordinary JSON, CBOR Diagnostic Notation, CBOR Deterministic Encoding Check, XML to Ordered JSON Nodes, Ordered JSON Nodes to XML, XML Serialization Normalization, XML and Namespace Well-formedness Check, HTML Character Reference Decoding, HTML Character Reference Encoding, HTML to Parsed JSON Document Tree, HTML Parsing Diagnostics, HTML Document Link Attributes, HTML Body Text Nodes, RFC 6902 JSON Patch Apply, RFC 6902 JSON Patch Applicability, JSON Changes to RFC 6902 Patch, RFC 9110 HTTP-date to UTC JSON, UTC JSON Fields to RFC 9110 HTTP-date, Precision Moment, DE440 Celestial Positions, Metered RMN Inference, Brokerage Account Reconciliation, Brokerage Daily Divination Reading, Brokerage Occupation Entropy, Brokerage Strategy Program Foundry, SEN Utter, SEN Articulate, SEN Predicate, SEN Posit, SEN Settle, SEN Induce Relation, SEN Relate Relations, SEN Coincide, SEN Canonicalize, SEN Type Inference, SEN Reading Conflation, Content Address, JSON Schema Validate, Attention Allocation, Mandarin Interlinear Reading.

    B9.6 🔓 open JSONRPC 130 skills
  • The execution layer for enterprise B2B paid advertising. Agents can build audiences, generate creative and offers, launch and manage campaigns across LinkedIn, Meta, Google, Microsoft and Reddit, run experiments, and read pipeline attribution — through the Metadata MCP server.

    A9.8 🔑 human key 4 skills
  • 121 pay-per-use AI agent services on Base mainnet (x402/USDC): content drafting, SEO tools, data utilities, and specialist agents.

    C+8.7 🔓 open 121 skills
  • OpenWOP reference workflow-engine host exposing its installed manifest agents over A2A (RFC 0076).

    B9.4 🔓 open 104 skills
  • 厂商中立的机器人零部件兼容性数据层。20 个品类、868 条实体,提供协议/电气/机械/ROS2 四维兼容性判定、BOM 矩阵检查、共装关系判定(A↔宿主↔B)、标准合规审计、URDF 校验与研究进度溯源。**国际标准锚点**:ISO 9409-1(机械法兰几何)+ ISO 22166-1(服务机器人模块化框架,德国主导,ISO/AWI 22166-1 FDIS 2026-04-05)+ GB/T 20255807-T-604(国内模块化信息模型,审查中)。既不生产也不转售任何零部件,兼容性结论基于厂商公开声明字段的规则推断,未声明维度显式标为 unknown。

    B9.3 🔓 open 20 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
  • Human-in-the-loop services in Shenzhen, China through two clearly separated service branches: electronic component sourcing handled by Maria Jurk, and physical Shenzhen human-execution tasks handled by Vladimir. Requests may be submitted by people or AI agents. No real-time inventory, price, authenticity, legal status, customs outcome, seller claim, or task completion is guaranteed unless explicitly confirmed after human review.

    C+8.7 🔓 open 15 skills
  • Consulte cadastro, sócios, sanções, dívidas e contratos de empresas em mais de 40 bases públicas. Veja as fontes e datas. Use também consultas em lote e API.

    C+9.1 🔓 open 23 skills
  • Apply structural edits (move/rotate footprints, resize a net's track width, add a mounting hole, edit a field, swap a footprint) to a KiCad 8/9 project, run electrical and design-rule checks under a named fabrication profile, and return a scoped pass/fail report plus downloadable Gerber X2/Excellon, BOM, position file, PDF, and preview artifacts. Claims are scoped: ERC/DRC clean under the listed profile rules, never "DFM approved"; footprint swaps are checked structurally, never electrically.. $0.25 per call, settled in USDC on Base mainnet over HTTP 402. No API keys, no accounts.

    D6.5 🔓 open
  • Take a robots.txt you already have and say what it actually does. It lints the file against RFC 9309 and reports the errors that silently change meaning, answers whether a named crawler may fetch a named path and which rule decided it, audits which AI crawlers the file really stops (and which it only appears to), diffs two versions by EFFECT rather than by line, and merges a ready-made stance into an existing file without discarding the rules already there. It reads the file you paste; it fetches nothing. robots.txt is a request, not an enforcement mechanism, and the audit says so where a crawler is known to ignore it. Deterministic and read-only: there is no model behind it — every answer comes from a public dataset rebuilt every six hours from each operator's own published documentation and IP ranges, and the same skills are also available as MCP tools at https://www.pathwren.workers.dev/mcp/robots. No key, no signup, no quota. Independent and unaffiliated with any operator it documents.

    B+9.8 🔓 open JSONRPC 5 skills
  • ElectroGen AI
    ● healthy

    AI electronics blueprint generator — turns a plain-language idea into a buildable project: BOM with real marketplace parts, wiring, firmware, engineering checks and prototype renders for Arduino, ESP32, Raspberry Pi and generic platforms.

    C8.0 🔓 open
  • Drop-in security configuration files that protect AI coding agents from 12 critical attack vectors plus 12 stack-specific hardening patterns (OAuth, JWT, WebSocket, CORS, file magic-bytes, image bombs, passwords/sessions, mass assignment/IDOR, security headers, crypto hygiene, LLM output handling, CI/CD). Covers 17 AI tools and 5 backend platforms.

    E3.6 ⚡ agent-pays · x402