Payments over sound. Proving x402's primitive (EIP-3009) works on any medium.

Tooling for building applications with x402 payment capabilities. Supports buyer and seller roles.

Agent-first Remote MCP for X (Twitter) batch crawling with x402 USDC top-up (Base/Solana). Includes OpenAPI + copy-paste ADK/curl E2E examples.

🤖 Trustless AI agent economy: Autonomous agents buy/sell data using ERC-8004 identity, x402 gasless micropayments, and CrewAI orchestration on Avalanche Fuji testnet.

Facilitator Backend, including x402 and others

HTTP 402 payment protocol implementation for r1x

x402 Payment Protocol SDKs - Dead simple micropayments for APIs and AI agents

x402 payments implementation in FastAPI & Pydantic using 1Shot API as a facilitator.

Machine 2 Machine Protocol, x402 + A2A + MCP

The official SDK for the Reap Protocol: The Agentic Commerce Grid.

A ROS 1 (Noetic) package that turns robot capabilities into paid API endpoints - using Solana’s x402 protocol for pay-to-access control — and includes tools for making and verifying payments to external services.

🚀 The fast, Pythonic way to build x402 servers and clients. Supports x402Instant.