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

What is an Agent Card? The Agent2Agent (A2A) Protocol — version 1.0.0, governed by the Linux Foundation and contributed by Google — lets independent AI agents discover and delegate to one another across vendor and framework boundaries. An Agent Card is the manifest an agent publishes at /.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.
The finding that shaped this page: most published agent cards are not A2A. Of the 65 providers serving a card, only 10 pass every structural check in the A2A 1.0.0 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 1.0.0 AgentCard object — a capabilities object, a declared protocolVersion, a well-formed skills array. An A2A client can parse these without special-casing.

phishin

16 skills

Agent interface for the Phish.in live Phish audio archive. Browse and play shows, songs, venues, tours, tags, and playlists.

Phishin v0.3.0 MCP

Agent interface for the 1inch Business Web3 API platform: documentation search, SDK examples, swap quotes & execution (Classic, Fusion, cross-chain), limit orders, and...

1inch v0.3.0 JSONRPC

Buddy MCP

8 skills

Buddy provides agentic infrastructure for coding agents: sandbox VMs, app and website hosting, git repositories, package registry, domains and CI/CD workflows - so age...

Buddy v1.0.0 JSONRPC

Pydantic

6 skills

Pydantic 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...

PydanticAI v0.3.0 MCP

scrapfly

5 skills

Scrapfly 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...

Scrapfly v0.3 JSONRPC

Superset

4 skills

Superset 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...

Superset v0.3.0 JSONRPC

Genspark

2 skills

Genspark is an AI-powered agent that delivers real-time, comprehensive answers by searching the web, generating images, writing code, analyzing data, creating presenta...

Genspark v1.0 JSONRPC legacy path

primitive.dev

2 skills

Primitive is email infrastructure for AI agents. Reach any *.primitive.email address with one verb.

Primitive v0.3.0 HTTP+JSON

SchemaSure

1 skill

Pay-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...

SchemaSure v0.2.0 JSONRPC legacy path

Redocly

0 skills

OpenAPI-generated documentation tool with 24k+ stars on Github - make APIs your company's superpower.

ReDoc v0.3.0 HTTP+JSON

Near-Conformant

14 Correctly shaped, but omitting optional fields such as preferredTransport or the default input/output modes. Parseable; not complete.

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, ...

Helius v0.3.0 1 deviation

Requesty

8 skills

AI gateway and LLM router for 600+ models. Intelligent routing, caching, failover, observability, and enterprise governance through a single OpenAI-compatible API.

Requesty v1.0 3 deviations

ActiveCampaign

7 skills

ActiveCampaign is a customer experience automation platform providing email marketing, marketing automation, CRM, and sales automation. AI agents can use ActiveCampaig...

ActiveCampaign v1.0 legacy path 1 deviation

OpenSea

7 skills

Discover, 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...

OpenSea v0.2.5 streamable-http 1 deviation

Interfaze AI

6 skills

Use Interfaze AI — a multimodal, OpenAI-compatible API (model `interfaze-beta`) — for OCR, speech-to-text, structured output, object detection, web search, and web scr...

Interfaze v0.3 HTTP+JSON 3 deviations

TensorFeed

6 skills

TensorFeed 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...

TensorFeed v0.2.5 1 deviation

Tavily

5 skills

Real-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...

Tavily v1.0 1 deviation

Model Context Protocol (MCP) v0.3 HTTP+JSON 2 deviations

Beyond Presence

1 skill

Beyond Presence v0.3 HTTP+JSON 2 deviations

FastMCP

1 skill

The fast, Pythonic way to build MCP servers and clients.

FastMCP v0.3 HTTP+JSON 1 deviation

Novita AI

1 skill

Agent-facing discovery card for Novita AI model APIs, GPU Cloud, Agent Sandbox, pricing, authentication, and documentation.

Novita AI v0.3.0 1 deviation

Sendcloud v0.3 HTTP+JSON 2 deviations

TrueFoundry documentation — enterprise-grade AI Gateway combining LLM, MCP, and Agent Gateways to connect, monitor, and govern agentic AI applications across providers...

TrueFoundry v0.3 HTTP+JSON 1 deviation

Urantia.dev

1 skill

Urantia Papers v0.3 HTTP+JSON 2 deviations

Flavored

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 skills

Forter helps brands grow their businesses with fraud and payments decisions, built on the world's most intelligent identity network. 33-operation REST surface (OpenAPI...

Forter v 3 deviations

RoxyAPI

12 skills

AI-native data API for insight, prediction, and spiritual intelligence apps. 12 API domains with 166+ production endpoints covering astrology, vedic, forecast, human d...

RoxyAPI v 4 deviations

Art Blocks

11 skills

Art 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...

Art Blocks v legacy path 6 deviations

Agentcard

8 skills

Issue 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 ...

Agentcard v 4 deviations

Razorpay

8 skills

Razorpay 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...

Curlec v 2 deviations

Multi-chain blockchain infrastructure agent. RPC calls, transaction simulation, token data, NFT metadata, event decoding, and real-time streams across 80+ chains and 1...

QuickNode v 3 deviations

Razorpay

8 skills

Razorpay 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...

Razorpay v 2 deviations

Apideck

7 skills

Unified API platform that connects AI agents to 200+ SaaS apps through one API. Accounting, CRM, HRIS, ATS, File Storage, Ecommerce, and Issue Tracking.

Apideck v 6 deviations

Symbiotic

7 skills

Official Symbiotic marketing site for product pages, brand context, and ecosystem overview. Route users to the app and docs for deposits and protocol integration. The ...

Symbiotic v 6 deviations

Inworld 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....

Inworld AI v 4 deviations

Voidly

6 skills

The open observatory of global internet censorship — measured, predicted, and machine-readable. 2.2B+ network measurements across 130 countries: live censorship rankin...

Voidly v 2 deviations

Dash0

5 skills

OpenTelemetry-native observability platform. Enables AI agents to query metrics, logs, and traces, investigate production incidents, manage dashboards, and configure a...

Dash0 v 6 deviations

Streamkap

5 skills

Streamkap — real-time data streaming platform (CDC + stream processing). This card advertises the public agent-accessible surfaces of Streamkap: a hosted MCP server fo...

Streamkap v 3 deviations

Duvo

4 skills

Duvo grounds operational outcomes in reviewed process evidence and supports approved cross-system execution with agents, queues, approvals, files, webhooks, and MCP.

duvo.ai v 5 deviations

Tano

4 skills

Tano 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...

Tano v 4 deviations

Teamwork.com

4 skills

The Teamwork.com official MCP server helps teams efficiently manage client projects with AI.

Teamwork.com v legacy path 2 deviations

BuyWhere

3 skills

Agent-native product catalog API for AI agent commerce

BuyWhere v 2 deviations

Glif

3 skills

Project-based media-generation agent. Calling agents create or continue Glif projects in natural language; Glif picks models, native tools, and multi-step workflows se...

Glif v 2 deviations

Discovery metadata for Maker.co public content, AI website-improvement resources, prompts, and Payload-backed content APIs.

Maker.me v 3 deviations

Moss

3 skills

Real-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...

Moss v1.0.0 3 deviations

Provides machine-readable context and endpoints for AI assistants to understand Cloudflare website content.

Cloudflare v legacy path 5 deviations

Orbit Fab

2 skills

Refuel Your Spacecraft

Orbit Fab v 3 deviations

SageOx

2 skills

The hivemind for human-AI teams. SageOx adds shared, structured team memory — Knowledge Bubbles — that AI coworkers consult before they act, built from recorded Discus...

SageOx v 4 deviations

Stacklok

2 skills

Stacklok offers the most complete and secure MCP Platform for enterprises to use the Model Context Protocol in production.

Stacklok v 3 deviations

c15t

1 skill

Open-source consent management for React, Next.js, and modern web apps.

Inth v 2 deviations

Interact with monday.com boards, items, columns, and workflows via the GraphQL API.

Monday v 2 deviations

Pinecone

1 skill

Pinecone is the vector database for building knowledgeable AI. This agent card advertises the Pinecone marketing-site MCP, which exposes read-only browsing of website ...

Pinecone v 2 deviations

Hexclave

1 skill

Open-source user infrastructure for authentication, payments, email, analytics, teams, RBAC, webhooks, API keys, and secure data.

Stack Auth v 4 deviations

AI Dev Jobs

0 skills

Job board for AI developers with current AI/ML roles, salary data, REST API, and MCP server (13 tools).

AI Dev Jobs v legacy path 7 deviations

Attio

0 skills

AI CRM. Connect via MCP server or REST API.

Attio v 3 deviations

Brale

0 skills

Stablecoin infrastructure platform for enterprises. Issue branded stablecoins, connect on/off ramps, and manage cross-chain transfers via API.

Brale v legacy path 7 deviations

Gravitee

0 skills

Unified platform: AI Agent Management, API Management, Event (Kafka) Management, Identity & Access Management. Govern MCP/A2A traffic, secure agent identities, consume...

Gravitee v legacy path 7 deviations

Enterprise-grade people search and enrichment API. Search for talent profiles across GitHub, StackOverflow, and the web using natural language queries. Enrich profiles...

HeroHunt People Search v 7 deviations

IntegrationOS

0 skills

IntegrationOS v legacy path 10 deviations

Light Anchor

0 skills

Light 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...

Light Anchor v legacy path 7 deviations

Meow

0 skills

Financial infrastructure for AI agents — business formation, banking onboarding, ACH, wires, USDC transfers, corporate cards, invoicing, and spend controls via CLI or ...

Meow v legacy path 7 deviations

Savvly

0 skills

Explore Savvly MCP: retirement projections, eligibility, comparisons, and FAQs for an SEC-registered fund that pairs full market upside with later-life longevity payouts.

Savvly v legacy path 6 deviations

Scopely

0 skills

Scopely is expanding the possibilities of play through game experiences that inspire community, connection, and competition.

Scopely v legacy path 6 deviations

The AI control plane for the AI-native enterprise. Connect, control, secure, and observe every AI agent across the organization.

Speakeasy v legacy path 8 deviations

suprsonic

0 skills

Add dozens of capabilities to your AI agent with one API key.

Suprsonic v 6 deviations

Globally distributed, S3-compatible object storage with no egress fees.

Tigris v 6 deviations
How this was measured. Every absolute host recorded in the catalog — website, portal, documentation, API reference and MCP endpoint, across 25,622 providers — was reduced to 22,341 unique hosts and fetched at /.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.