A2A Agent Cards
Every provider on the APIs.io network serving a machine-readable agent discovery manifest at the A2A well-known path — graded against the A2A 1.0.0 specification rather than merely counted.
65 providers · 10 conformant · 260 published skills
/.well-known/agent-card.json (RFC 8615) advertising its identity, capabilities, skills, endpoint and authentication. A2A’s own discovery documentation names three adoption strategies, and the second is a curated registry — a catalog holding agent cards queryable by skill, tag and provider. This is that catalog.
AgentCard object. 41 fail a hard one — capabilities shipped as an array where the spec defines an object, supportedInterfaces where the spec says additionalInterfaces, no protocolVersion at all. A further 15 are still served at the pre-0.3 path /.well-known/agent.json, where an A2A 1.0.0 client will never look. The format is fragmenting faster than it is spreading, which is exactly why these pages grade rather than count.
Conformant
10 Passes every structural check in the A2A 1.0.0AgentCard object — a capabilities object, a declared protocolVersion, a well-formed skills array. An A2A client can parse these without special-casing.
phishin
16 skillsAgent interface for the Phish.in live Phish audio archive. Browse and play shows, songs, venues, tours, tags, and playlists.
1inch Business Agent
9 skillsAgent interface for the 1inch Business Web3 API platform: documentation search, SDK examples, swap quotes & execution (Classic, Fusion, cross-chain), limit orders, and...
Buddy MCP
8 skillsBuddy provides agentic infrastructure for coding agents: sandbox VMs, app and website hosting, git repositories, package registry, domains and CI/CD workflows - so age...
Pydantic
6 skillsPydantic is the end-to-end AI engineering stack for Python: data validation, type-safe agents, LLM proxy, and observability. This A2A card represents the Pydantic Logf...
scrapfly
5 skillsScrapfly is a managed web scraping and browser automation platform. One API key gives an agent: anti-bot bypass on 20+ vendors (Cloudflare, DataDome, PerimeterX, Akama...
Superset
4 skillsSuperset runs parallel AI coding agents in isolated Git worktrees. This service speaks the Model Context Protocol (JSON-RPC over Streamable HTTP) rather than the A2A m...
Genspark
2 skillsGenspark is an AI-powered agent that delivers real-time, comprehensive answers by searching the web, generating images, writing code, analyzing data, creating presenta...
primitive.dev
2 skillsPrimitive is email infrastructure for AI agents. Reach any *.primitive.email address with one verb.
SchemaSure
1 skillPay-per-call API that extracts strict, JSON-Schema-valid typed JSON from unstructured text or HTML. Output is guaranteed to validate against the caller-supplied JSON S...
Near-Conformant
14 Correctly shaped, but omitting optional fields such aspreferredTransport or the default input/output modes. Parseable; not complete.
Helius for Agents
8 skillsHelius 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, ...
Requesty
8 skillsAI gateway and LLM router for 600+ models. Intelligent routing, caching, failover, observability, and enterprise governance through a single OpenAI-compatible API.
ActiveCampaign
7 skillsActiveCampaign is a customer experience automation platform providing email marketing, marketing automation, CRM, and sales automation. AI agents can use ActiveCampaig...
OpenSea
7 skillsDiscover, buy, sell, and mint NFTs and swap tokens across dozens of blockchains. The OpenSea agent exposes real-time NFT, token, collection, wallet, and marketplace da...
Interfaze AI
6 skillsUse Interfaze AI — a multimodal, OpenAI-compatible API (model `interfaze-beta`) — for OCR, speech-to-text, structured output, object detection, web search, and web scr...
TensorFeed
6 skillsTensorFeed is a real-time AI ecosystem data provider built for agents. It exposes free and x402-priced JSON feeds covering AI news, model and GPU pricing, service stat...
Tavily
5 skillsReal-time search engine for AI agents and RAG workflows. Provides web search, content extraction, site mapping, web crawling, and deep research optimized for LLM consu...
Model Context Protocol
2 skillsBeyond Presence
1 skillFastMCP
1 skillThe fast, Pythonic way to build MCP servers and clients.
Novita AI
1 skillAgent-facing discovery card for Novita AI model APIs, GPU Cloud, Agent Sandbox, pricing, authentication, and documentation.
Sendcloud API Developer Portal
1 skillTrueFoundry Docs
1 skillTrueFoundry documentation — enterprise-grade AI Gateway combining LLM, MCP, and Agent Gateways to connect, monitor, and govern agentic AI applications across providers...
Urantia.dev
1 skillFlavored
41 An agent card in spirit rather than in schema. Served at the A2A discovery path and genuinely useful for discovery, but failing a structural check that means an A2A client cannot assume it will parse.forter
25 skillsForter helps brands grow their businesses with fraud and payments decisions, built on the world's most intelligent identity network. 33-operation REST surface (OpenAPI...
RoxyAPI
12 skillsAI-native data API for insight, prediction, and spiritual intelligence apps. 12 API domains with 166+ production endpoints covering astrology, vedic, forecast, human d...
Art Blocks
11 skillsArt Blocks is the leading platform for generative art on the blockchain. Connect to discover projects, explore artist catalogs, look up token metadata, check minting a...
Agentcard
8 skillsIssue virtual Visa cards for AI agents. Fund a card with a fixed USD budget, hand the credentials to an agent via MCP, and spend anywhere Visa is accepted. Single-use ...
Razorpay
8 skillsRazorpay is an RBI-authorised full-stack payment platform for businesses in India, Malaysia (via Curlec), Singapore, and the USA. Agents can create orders, payment lin...
Quicknode Blockchain Agent
8 skillsMulti-chain blockchain infrastructure agent. RPC calls, transaction simulation, token data, NFT metadata, event decoding, and real-time streams across 80+ chains and 1...
Razorpay
8 skillsRazorpay is an RBI-authorised full-stack payment platform for businesses in India, Malaysia (via Curlec), Singapore, and the USA. Agents can create orders, payment lin...
Apideck
7 skillsUnified API platform that connects AI agents to 200+ SaaS apps through one API. Accounting, CRM, HRIS, ATS, File Storage, Ecommerce, and Issue Tracking.
Symbiotic
7 skillsOfficial Symbiotic marketing site for product pages, brand context, and ecosystem overview. Route users to the app and docs for deposits and protocol integration. The ...
Inworld AI Realtime Voice Agent
6 skillsInworld AI is a research lab and inference provider focused on realtime AI models for consumer-facing applications. We build voice AI that feels as human as it sounds....
Voidly
6 skillsThe open observatory of global internet censorship — measured, predicted, and machine-readable. 2.2B+ network measurements across 130 countries: live censorship rankin...
Dash0
5 skillsOpenTelemetry-native observability platform. Enables AI agents to query metrics, logs, and traces, investigate production incidents, manage dashboards, and configure a...
Streamkap
5 skillsStreamkap — real-time data streaming platform (CDC + stream processing). This card advertises the public agent-accessible surfaces of Streamkap: a hosted MCP server fo...
Duvo
4 skillsDuvo grounds operational outcomes in reviewed process evidence and supports approved cross-system execution with agents, queues, approvals, files, webhooks, and MCP.
Tano
4 skillsTano is an AI-native influencer marketing agency and AI-powered influencer marketing management platform. It manages end-to-end creator partnership ad campaigns on Tik...
Teamwork.com
4 skillsThe Teamwork.com official MCP server helps teams efficiently manage client projects with AI.
Glif
3 skillsProject-based media-generation agent. Calling agents create or continue Glif projects in natural language; Glif picks models, native tools, and multi-step workflows se...
Discovery metadata for Maker.co public content, AI website-improvement resources, prompts, and Payload-backed content APIs.
Moss
3 skillsReal-time semantic search runtime for AI agents. Sub-10ms semantic, keyword, or hybrid retrieval against project-owned indexes, hosted or on-device. Supports bring-you...
Cloudflare Site Agent
2 skillsProvides machine-readable context and endpoints for AI assistants to understand Cloudflare website content.
SageOx
2 skillsThe hivemind for human-AI teams. SageOx adds shared, structured team memory — Knowledge Bubbles — that AI coworkers consult before they act, built from recorded Discus...
Stacklok
2 skillsStacklok offers the most complete and secure MCP Platform for enterprises to use the Model Context Protocol in production.
c15t
1 skillOpen-source consent management for React, Next.js, and modern web apps.
monday.com MCP Server
1 skillInteract with monday.com boards, items, columns, and workflows via the GraphQL API.
Pinecone
1 skillPinecone is the vector database for building knowledgeable AI. This agent card advertises the Pinecone marketing-site MCP, which exposes read-only browsing of website ...
Hexclave
1 skillOpen-source user infrastructure for authentication, payments, email, analytics, teams, RBAC, webhooks, API keys, and secure data.
AI Dev Jobs
0 skillsJob board for AI developers with current AI/ML roles, salary data, REST API, and MCP server (13 tools).
Brale
0 skillsStablecoin infrastructure platform for enterprises. Issue branded stablecoins, connect on/off ramps, and manage cross-chain transfers via API.
Gravitee
0 skillsUnified platform: AI Agent Management, API Management, Event (Kafka) Management, Identity & Access Management. Govern MCP/A2A traffic, secure agent identities, consume...
HeroHunt People Search API
0 skillsEnterprise-grade people search and enrichment API. Search for talent profiles across GitHub, StackOverflow, and the web using natural language queries. Enrich profiles...
IntegrationOS
0 skillsLight Anchor
0 skillsLight Anchor builds AI-run consumer brands. We own and operate our own brands today, each run by AI agents across marketing, sourcing, operations, and support. Portfol...
Meow
0 skillsFinancial infrastructure for AI agents — business formation, banking onboarding, ACH, wires, USDC transfers, corporate cards, invoicing, and spend controls via CLI or ...
Savvly
0 skillsExplore Savvly MCP: retirement projections, eligibility, comparisons, and FAQs for an SEC-registered fund that pairs full market upside with later-life longevity payouts.
Scopely
0 skillsScopely is expanding the possibilities of play through game experiences that inspire community, connection, and competition.
Speakeasy AI Control Plane
0 skillsThe AI control plane for the AI-native enterprise. Connect, control, secure, and observe every AI agent across the organization.
suprsonic
0 skillsAdd dozens of capabilities to your AI agent with one API key.
Tigris Object Storage
0 skillsGlobally distributed, S3-compatible object storage with no egress fees.
/.well-known/agent-card.json, plus the
pre-0.3 /.well-known/agent.json on every host that answered. No host was invented and no
subdomain guessed. 20,185 responded. A card is listed here only on an observed HTTP 200 that parses as
a JSON object carrying real AgentCard shape — single-page-app shells that return 200
with HTML for every path are rejected, not counted.
An agent card cannot be derived. It is served from the provider’s own host over the provider’s own TLS, or it does not exist. That makes this the one agent surface in the catalog that is provider-published by construction — nothing here was generated, modelled, or reconstructed on a provider’s behalf, and each detail page carries the fetch date and HTTP status behind it.
The count is a floor, not a census. Hosts came only from URLs the catalog already records, so a card served from a subdomain nobody has listed is invisible to this scan. Publish one and it will be found on a later pass — or add your API and tell us where to look.