x402

A client for a neutral AI referee service that handles tie-breaks, sealed reviews, and signed receipts for AI agents, with pay-per-request billing over x402 on Base.

OpenSpender gives AI agents a self-custodial wallet so they can pay for model and tool calls with per-request, daily, and total caps. It connects through MCP and supports clients like Claude Code, ChatGPT, Codex, and opencode, with itemized spend and a catalog of x402 and MPP services.

Open-source CLI and agent infrastructure for handling paid API requests. It detects 402 payment challenges, signs stablecoin payments with a local wallet, supports MCP, and includes a payment debugger plus catalog tooling.

OpenSpender is a self-custodial wallet for agent-to-agent payments. The page shows a command-line connect flow, explains allowance-based spending rules, and includes an example of one agent paying another through MCP-compatible tools.

Pay-per-fetch China data and analysis API for AI agents, with x402 micropayments, MCP tools, and live endpoint docs.

A pay-per-crawl system that lets site owners charge AI crawlers per page across WordPress, Next.js, Laravel, Cloudflare, nginx, Python, Go, and more. The page says payments settle in USDC on Base, with no custody, and that each edition includes crawler discovery files and support for x402/MPP-style access control.