The A2A x402 Extension brings cryptocurrency payments to the Agent-to-Agent (A2A) protocol, enabling agents to monetize their services through on-chain payments. This extension revives the spirit of HTTP 402 "Payment Required" for the decentralized agent ecosystem.

Lucid Agents Commerce SDK. Bootstrap AI agents in 60 seconds that can pay, sell, and participate in agentic commerce supply chains. Our protocol agnostic SDK provides CLI-generated templates and drop-in adapters for Hono, Express, Next.js, and TanStack, giving you instant access to crypto/fiat payment rails (AP2, A2A, x402, ERC8004).

A complete TypeScript implementation of the Python x402 payment protocol extension for A2A (Agent-to-Agent) communication. Enable your AI agents to request, verify, and settle crypto payments seamlessly.

Next.js-like framework building AI Agents that are payment-native. Bootstrap your agent with A2A, MCP, x402 payments, and ERC-8004 identity.

AI agent stack that combines A2A messaging + x402 micropayments + ERC‑8004 identity(trustless agent).

🚀 Curated resources for Google's Agent Payments Protocol (AP2), A2A & x402 — blogs, videos, repos & specs. Contributions welcome!

342-test security harness for autonomous AI agents. MCP, A2A, x402/L402, AIUC-1 pre-cert, NIST AI 800-2 aligned. 97.9% production-validated. pip install agent-security-harness

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Autonomous Agent Ecosystem SDK for Solana. Build AI agents that communicate, negotiate & transact independently using x402 Payment Protocol. 400ms settlement, USDC micropayments, A2A protocol. Token: ATHR

Create and register ERC-8004 trustless AI agents on any EVM chain — Ethereum, BNB Chain, Base, Arbitrum, Optimism, Polygon, and more. Zero-dependency standalone UI for on-chain agent identity registration, reputation, and validation. Mint ERC-721 NFT agent identities with metadata, service endpoints, A2A/MCP discovery, and x402 payment support.

A complete TypeScript implementation of the Python x402 payment protocol extension for A2A (Agent-to-Agent) communication. Enable your AI agents to request, verify, and settle crypto payments seamlessly.

AI agents compete in games using A2A protocol, ADK, and x402 micropayments.

Paid Agent-as-a-Service platform via A2A + x402

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A directory which allows you to discover the emerging standards and protocols which will define how we build, integrate and connect agentic AI workloads.

Production-ready AI agent template with x402 payments, A2A protocol, and ERC-8004 on-chain identity. Deploys to AWS Lambda via Terraform.

Web-based multi-protocol validator for AI agent endpoints. Enter a URL and get instant assessment across eight protocol layers — MCP, A2A/AP2, x402, OAuth 2.1, MCP Apps, ERC-8004, OASF, and on-chain reputation.

Universal Execution Layer — bidirectional AI↔human task marketplace. AI agents delegate real-world tasks (A2H), humans commission AI agents (H2A). Gasless x402 payments on 9 chains, on-chain escrow, ERC-8004 identity, A2A Protocol + 24 MCP tools. Live on Base.

Autonomous AI Agent Platform - Marathon Mode, x402 Payments, ERC-8004 Identity, A2A Protocol. Powered by Gemini.

x402 & ERC8004 & A2A

Machine 2 Machine Protocol, x402 + A2A + MCP

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Wallet for payers supporting the a2a-x402 protocol, powered by Privy

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A2A + x402 payment integration SDK - Monetization layer for AI agents

A2A payments using x402 to bid on user behalf to buy products on BNB Chain

Official Python SDK for GT8004 — AI agent observability with MCP, A2A, x402 payment tracking. FastAPI, Flask, FastMCP middleware included.

Multi-agent commerce framework on X Layer — OKX Onchain OS, x402 payments, ERC-8004/8183, MCP server, A2A agent card. 12+ mainnet transactions.

On-chain security and market intelligence for AI agents on Base — 14 services via x402, MCP, A2A, and ACP. EIP-712 signed attestations.

x402 & ERC8004 & A2A