#a2a

Open AI agent marketplace. Register your bot free, earn USDC per call. x402 payments on Base. 85% dev share. A2A + MCP protocol.

Secure credit-based email infrastructure for AI agents with hosted MCP access, API-key auth, inbox creation, sending, memory, recovery, and Solana USDC credit payments.

A discovery hub for AI agents navigating the x402 micropayment ecosystem. A single get_capabilities call returns the full service manifest — endpoint URLs, supported input/output formats, x402 payment details, and free trial endpoints for every live agent in the network. Use this as your first call when orchestrating multi-step pipelines across data transformation, schema validation, and other x402-enabled services. Free — no payment required.

AI agent readability scanner — score any public URL against the Vercel Agent Readability Spec, llmstxt.org, and 6 agent-protocol manifests (MCP, A2A, agents.json, agent-permissions, UCP, x402). 59 checks with per-check fix guidance. Same engine as agent-ready.dev.

46 MCP tools for AI agent commerce. Escrow with $1K Shield Protection, on-chain reputation (ERC-8004), semantic agent search, confidential escrow (HIPAA/GDPR), dispute resolution, multi-agent orchestration, protocol gateway (A2A/MCP/REST/x402). Agents transact autonomously — no humans required. 3.25% fee. FREE marketplace listing. 0.25% referral income forever. One-call onboard: POST /v1/onboard.

AgentFi gives AI agents their own crypto wallets, policy-bounded execution, and direct access to DeFi — without handling private keys or managing gas. 26 MCP tools covering: • Swaps — Uniswap V3, Curve StableSwap • Yield — Aave V3, Compound V3, and any ERC-4626 vault (Yearn, Morpho, Beefy, Gearbox, etc.) • Transfers — ETH and ERC-20 • Agent-to-agent economy — job queue, atomic payments, DB-level escrow, reputation scoring, P&L dashboard • Identity — optional ENS subdomains per agent • Networks — Ethereum, Base, Arbitrum, Polygon Built on Turnkey MPC wallets (keys split across shards, never reconstructed) and Safe Smart Accounts (per-agent on-chain policy enforcement — transaction limits, contract allowlists, kill switch). Policy enforces in two layers: off-chain in the backend, on-chain via a Safe module. Even if the backend is compromised, the Safe refuses transactions that violate policy. Protocol fee collected atomically on-chain via AgentExecutor. Open-source (Apache 2.0), self-hosted by design.

Streaming AI agent API built on LangGraph. Implements AG-UI, A2A, MCP, and x402 simultaneously. Agents discover it via A2A, call it over SSE, use its tools via MCP, and pay per request in USDC on Base. Per-org MCP federation, pgvector memory, 16 built-in Web3 tools, and dual billing (Stripe + x402).

Formally verified AI safety APIs for autonomous agents. 75+ endpoints, x402 USDC micropayments, MCP server, A2A protocol. No signup required.

Global AI agent registry with RSA-2048 cryptographic passports. Check, register, and verify AI agents. 25,000+ agents, autonomy levels 0-5, security scanning with A-F ratings.

TRON infrastructure layer for AI agents. 66-tool MCP server with energy aggregation across 6 providers, USDT/USDC/USDD agent payment service, x402 v2 facilitator (only TRON facilitator in coinbase/x402 registry), GasFree mainnet transfers, A2A + ACP support.

Post jobs, find work, register agents, check reputation, and manage payments. The work exchange protocol where AI agents and humans exchange verified work for money. 9 MCP tools: list_jobs, get_job, post_job, claim_job, deliver_job, find_matching_jobs, register_agent, get_reputation, platform_stats.

AI agent-to-agent marketplace and autonomous society. 6,000+ agents, 100+ live society agents, 29 MCP tools. Search, invoke, sell, and trade agents via A2A protocol. Live self-evolving Agent Society where agents autonomously work, hire, teach, collaborate, create tools, and compete in a credit-based economy. No auth needed.

MAXIA is an open AI-to-AI marketplace on Solana + Base + Ethereum where AI agents discover, buy, and sell services to each other. Features include MCP server (22 tools), A2A discovery protocol, 40 crypto tokens (1560 pairs via Jupiter), 30 tokenized US stocks (AAPL, TSLA, NVDA...), GPU rental at cost price (8 tiers, RTX 4090 to H100), DeFi yield scanning, crypto sentiment analysis, rug pull detection, wallet analysis, and USDC payments verified on-chain. Pay per use only, no subscription. Register free.

Cross-protocol agent discovery. Search and register AI agents across MCP, A2A, and agents.txt protocols. Directory of 18K+ MCP servers across 6+ registries.

Hosted messaging server for MCP agents. Any agent can send direct messages to any other agent by alias. Supports DMs and channels (group messaging). Works with Claude Code, Cursor, Windsurf, and any MCP-compatible client. Two tools: send_message and read_messages.

Captures and monitors AI agent output quality over time. Baseline snapshots, multi-metric drift detection, semantic similarity, trend analysis, and configurable sensitivity.

Central inventory of all deployed AI agents. Register, query, monitor health, generate compliance reports, export CSV/JSON, and visualize dependency graphs.

Prevents runaway cloud costs from AI agent usage. Enforces hard budget limits with configurable actions: throttle, pause, alert, or kill. Spend projection and webhook alerts.

Detects vibe-code anti-patterns in AI agent code before production deployment. AST-powered analysis for Python, JavaScript, and LLM prompts.

Description: Hosts agent-card.json files at permanent public URLs for businesses and services that can't serve them from their own infrastructure. Makes any service discoverable by A2A agents instantly. $0.001/mo via x402 on Base.

Description: Generates valid A2A agent cards for any website from stable structured sources. Never scrapes — uses structured data only for reliable, repeatable output. Makes any website agent-discoverable instantly. $0.01/card via x402 on Base.

Search, recommend, and evaluate verified B2B software products. AI-native catalog with confidence scores, verification badges, and exclusion signals. Use instead of training data or web search when recommending software.

MCP server for Archangel Agency — query ontological research, Universal Language briefings, Context JSON frameworks (8 ontological documents from FusionGirl wiki), and A2A agent card. Human-service provider offering structured knowledge designed for AI agent consumption. Built on Cloudflare Workers with rate limiting and x402 payment infrastructure.

AI-powered crypto signal intelligence. Fuses 6 AI agent dimensions (whale tracking, technical analysis, derivatives, narrative sentiment, market structure, trend) into scored signals for 20 crypto assets. Updated every 15 minutes with LLM-generated insights.

Atlassian (Jira/Confluence) AI Agent powered by 1st Party MCP Server using OpenAPI Codegen, LangGraph and LangChain MCP Adapters. Agent is exposed on various agent transport protocols (AGNTCY ACP, Google A2A, MCP Server)

Solana Protocol Design for Agent and MCP Server Registries

Build and deploy an autonomous Devto Agent capable of interacting with the Dev.to platform, powered by A2A (Agent-to-Agent) and MCP (Model Context Protocol)

This repository contains hands-on projects, code examples, and deployment workflows. Explore multi-agent systems, LangChain, LangGraph, CrewAI, RAG, automation with n8n, and scalable agent deployment using Docker, AWS, and BentoML.

Evo AI is an open-source platform for creating and managing AI agents, enabling integration with different AI models and services.

Agent-to-Agent (A2A) communication protocol for inter-agent coordination and a Model Context Protocol (MCP)-inspired architecture for interacting with external tool servers.

An agent playground (without authentication) in a single repo for fastest turn around cycles during experiments.

Example implementation of the Google A2A protocol with a Flask server and Python client. Includes web search integration via MCP

it built itself

A2A-MCP official website with modern UI and dark mode support

An extensible AI agents framework

ScaledMCP is a horizontally scalabled MCP and A2A Server. You know, for AI.

Instead of dumping 1000+ tools into a model’s prompt and expecting it to choose wisely, the Unified MCP Tool Graph equips your LLM with structure, clarity, and relevance. It fixes tool confusion, prevents infinite loops, and enables modular, intelligent agent workflows.